JP3626027B2 - Optical disk playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical disk reproducing apparatus, and in particular, position information and recording data of a predetermined information unit such as compressed music data and compressed image data are multiplexed and recorded by an MD (mini disk) player or the like to obtain a predetermined reproduction output rate. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc reproducing apparatus that reads recorded data intermittently at a high rate from an optical disc that is rotated at a higher speed than a predetermined speed, writes it to a memory, and reads it from the memory at a rate at which a predetermined reproduction output rate is continuously obtained .
[0002]
[Prior art]
In a recording MD (MD-MO; Mini Disc-Magnet Optical), position information is stored in a program area (user recording area) in a recordable area of a track formed in a spiral shape from the inner periphery to the outer periphery. A certain address (the address is expressed by a combination of cluster position and sector position, such as 03 sector of 0001 cluster. 1 cluster = 36 sectors) and compressed music data as recording data are recorded in a multiplexed manner. The compressed music data is recorded with the music unit as an information unit. The MD player that reproduces the recording MD rotates the recording MD at a constant linear velocity by the spindle motor, focuses the light beam emitted from the optical pickup on the signal surface by the focus servo, and tracks by the tracking servo and the thread servo. In this state, the compressed music data read from the recording MD is decompressed and output by a reading system including a spindle motor, an optical pickup, a head amplifier, a digital signal processing circuit, and various servo systems. ing. This MD player is provided with a shock proof function for preventing sound skipping due to shock.
[0003]
That is, compressed music data of about 3 seconds to 10 seconds can be stored, and during reproduction, a predetermined reproduction output rate (there is an output rate based on the standard of the decompressed music data, in the case of an MD player, 44. It is equipped with a shock proof memory (DRAM) from which compressed music data is read out at a rate that provides a sampling frequency of 1 kHz. Then, the recording MD is rotated at a constant linear velocity that is approximately five times faster than the linear velocity necessary for obtaining a predetermined reproduction output rate, and the recording data is read from the recording MD at a high rate by the reading system. Write to the shockproof memory. The write rate to the shock proof memory is about 5 times higher than the read rate, and the shock proof memory is immediately full. Then, the writing to the shock proof memory and the reading of the compressed music data from the recording MD are temporarily interrupted, and the position information on the recording MD at which the compressed music data was last read by the optical pickup is stored. deep.
[0004]
After that, if the remaining data amount becomes the predetermined reference amount W or less due to the continuation of reading from the shock proof memory and a predetermined amount of empty space is generated, the position where the compressed music data was read last time is searched, and after the search again The operation of reading the recording data from the recording MD at a high rate and writing it in the shock proof memory is repeated. If a shock occurs, writing to the shock proof memory is interrupted, and while the data remains in the shock proof memory, the reading position immediately before the shock occurrence is searched, and after the search is completed, the compressed music data is read. By restarting writing to the shock-proof memory, it is possible to prevent sound skipping. W is set to be equal to or more than the minimum time necessary for completing the search of the reading position immediately after the occurrence of the shock when the shock occurs.
[0005]
When three tracks (tracks) are recorded for the first time on a completely blank recording MD, one track number (track number) TNO = 1 to 3 is recorded from the inner periphery side to the outer periphery side of the program area. Each continuous recording section (a section in which compressed music data is continuously recorded in the order of addresses, also referred to as a part) A, B, and C are recorded separately, and UTOC (User Table Of Contents) existing on the inner periphery side of the program area ) For each song, the song number and the address of the start position and end position of the continuous recording section constituting the song are associated with each area and recorded as UTOC information (disc management information) in the UTOC area of the recording MD. (FIG. 7 (1)). The recorded music can be edited. When the first TNO = 1 song is deleted, the information about the continuous recording section A is cleared, and B and C are changed to the music numbers TNO = 1 and 2, respectively. The changed UTOC information is recorded (FIG. 7 (2)). Further, when the songs 1 and 2 are combined, the UTOC information is recorded in which B is the first continuous recording section of the song 1 and the C is the second continuous recording section of the song 1. (FIG. 7 (3)). From this UTOC information, the positions and combination order of the continuous recording sections B and C constituting the music number 1 are known.
[0006]
When a new song is recorded in this state, recording is started from the first address a in the blank area closest to the innermost periphery of the program area, and continuously recorded up to the address b immediately before the start position of the continuous recording section B. When the recording proceeds as section A, the recording jumps to the head address g of the blank area closer to the inner periphery and continues. Then, when address g to address h are recorded as continuous recording section D and the recording of the music is finished, A is the first continuous recording section of the music of music number 2 and D is the second continuous of the music of music number 2 The UTOC information added as a recording section is recorded (FIG. 8 (1)). After that, when the song numbers 1 and 2 are switched, A is the first continuous recording section of the song with the song number 1, D is the second continuous recording section of the song with the song number 1, and B is the song with the song number 2. The UTOC information is recorded in which the first continuous recording section is changed to the second continuous recording section of the song having the song number 2 (FIG. 8 (2)). From this UTOC information, the positions and combination order of the continuous recording sections A and D constituting the music of the music number 1 can be found, and the positions and combination order of the continuous recording sections B and C constituting the music of the music number 2 can be found.
[0007]
When a recorded MD for recording is loaded into the set, the MD player reads and temporarily stores UTOC information, which is disc management information recorded in the UTOC area. When the PLAY key is pressed and playback is instructed sequentially, playback is performed in order from the song with the smallest song number with reference to the previously read UTOC information. At this time, if there is one continuous recording section constituting the music to be played back, the start position is searched and reading of the compressed music data is started, and when reading is completed up to the end position of the continuous recording section, the next music is recorded. Search for the start position of the first continuous recording section of and start reading. When there are a plurality of n continuous recording sections constituting the music, the start position of the first continuous recording section is searched and reading is started, and the reading is completed up to the end position of the first continuous recording section. Search for the start position of the second continuous recording section, start reading, and when the reading is finished up to the end position of the second continuous recording section, search for the start position of the third continuous recording section and start reading. When the reading is finished up to the end position of the nth continuous recording section, the start position of the first continuous recording section of the next song is searched and the reading is started.
[0008]
[Problems to be solved by the invention]
By the way, in a portable MD player, it is important to prevent excessive power consumption in order to lengthen the continuous reproduction time. The shockproof memory becomes full, and the compressed music data is temporarily read from the recording MD. During the interruption, the entire reading system including the tracking servo system is stopped, or a part of the reading system (including the tracking servo system) is stopped to suppress wasteful power consumption.
[0009]
During playback of the recording MD, the shock proof memory is full while the compressed music data is being read and written to the shock proof memory from near the end position of a certain continuous recording section of a certain song of the recording MD. Then, the remaining data amount becomes W or less, and when reading is resumed because a certain amount or more of free space has occurred, it immediately comes to the end position of the continuous recording section. Search and start reading. If the start position of the next continuous recording section to be reproduced is far from the end position of the continuous recording section that has been read, the search takes time, so that the remaining data amount in the shock proof memory is reduced and finally the remaining data is stored. In some cases, the data was lost and the sound was interrupted.
Although it is conceivable to increase W in order to prevent this sound interruption, it is difficult to suppress power consumption because the cycle of operation and pause of the reading system becomes faster and the pause period per time becomes shorter. End up.
An object of the present invention is to provide an optical disk reproducing apparatus that can achieve both of prevention of sound skipping and suppression of wasteful power consumption in view of the above-described problems of the prior art.
[0010]
[Means for Solving the Problems]
In the optical disk reproducing apparatus according to the first aspect of the present invention, the position information and the recording data for each information unit are multiplexed and recorded, and the optical disk rotated at a speed higher than the speed for obtaining a predetermined reproduction output rate is irradiated with the light beam and reflected. Light detection means for detecting a recording signal by receiving a beam, and a tracking error signal indicating an error between the reading track on the optical disc and the irradiation position of the light beam, and the irradiation position of the light beam based on the tracking error signal Tracking servo means for controlling the correction of the light beam, and a focus servo for generating a focus error signal indicating an error between the signal surface of the optical disk and the focal point of the light beam, and performing the correction control of the focal point of the light beam based on the focus error signal And a thread error signal indicating an error between the reading track on the optical disk and the position of the light detecting means. And a thread servo means for controlling the correction of the position of the light detection means based on the thread error signal, and a signal processing means for demodulating and outputting the recording data and position information of the optical disk from the detection output of the light detection means. Recording data reading means, storage means having a capacity for storing a predetermined amount of recording data, and recording data output at a high rate from the signal processing means are written to the storage means, and predetermined reproduction output is continuously performed from the storage means. Read and output at a rate to obtain the rate, and if the storage means is full of recorded data, the writing is interrupted and a full notification signal is generated, and when the remaining data amount in the storage means falls below a predetermined reference amount W Write / read control means for generating the occurrence notification signal, and when the full notification signal is issued, the current reading position information is input from the signal processing means and stored. In addition, when all or part of the recording data reading means is paused and a free space notification signal is issued, the recording data reading means is subjected to operation start control and search control of the last reading position of the previous time, After the search is completed, each information unit recorded on the optical disc includes an address control unit that causes the signal processing unit to resume the demodulated output of the recording data and the writing / reading control unit to resume the writing operation. It is composed of one continuous recording section in which data is continuously recorded in order or a combination of a plurality of continuous recording sections whose combination order is determined, and an information unit is configured for each information unit on the optical disc Combination when the position of continuous recording section and one information unit are composed of a combination of multiple continuous recording sections Management information indicating the order is recorded, the reference amount W used by the writing / reading control means is variable, and the reproduction control means receives the current input from the signal processing means when a full notification signal is issued. Is compared with the management information read from the optical disc in advance, and within a certain distance from the end position of the continuous recording section being read. In Whether or not Said Within a certain distance from the end position In In this case, the reference amount W used by the write / read control means is increased, Said Within a certain distance from the end position In If not, the feature is that the reference amount W is reduced.
According to the apparatus of claim 1, each information unit recorded on the optical disc is composed of one continuous recording section in which data is continuously recorded in the order of addresses, or a plurality of combinations in which a combination order is determined. In addition, the optical disc has a combination of continuous recording sections, and each information unit includes a combination of a plurality of continuous recording sections and a position of the continuous recording section constituting the information unit. Management information indicating the order is recorded. During reproduction of the optical disk, the recording data reading means reads the recording data read from the optical disk, the writing / reading control means writes it to the storage means at a predetermined high rate, and reads and outputs it at a rate for obtaining a predetermined reproduction output rate. When the storage means is full of recorded data, the writing / reading control means interrupts writing and issues a full notification signal, and the reproduction control means that receives the notification signal inputs the current reading position information from the signal processing means. And the suspension control is performed for all or part of the recording data reading means. Thereafter, when the remaining data amount becomes equal to or less than the reference amount W when the recording data is read from the storage means, the writing / reading control means issues a vacancy occurrence notification signal, and the reproduction control means receiving the notification signal receives the recording data reading means On the other hand, the operation start control and the search control of the last reading position of the previous time are performed. After the search is completed, the signal processing means restarts the demodulation output of the recording data, and the writing / reading control means restarts the writing operation. The reference amount W can be varied, and when the storage means is full of recorded data, the current reading position information input from the signal processing means is checked against the management information read from the optical disc in advance, and reading is in progress. Within a certain distance from the end of the continuous recording section In Whether or not Said Within a certain distance from the end position In Make it bigger and Said Within a certain distance from the end position In If not, make it small. As a result, within a certain distance from the end position of the continuous recording section In When a part that is not present is being reproduced, the rest period of the reading system becomes longer, and the cycle period of operation and rest becomes longer, so that power consumption can be suppressed. Also, if the storage means happens to be full of recorded data, it is within a certain distance from the end position of the continuous recording section that was being read. In As soon as possible, the operation of the reading system is resumed. Therefore, even if the head of the continuous recording section to be read next is separated, the head of the continuous recording section to be read is surely ensured while the remaining data exists in the storage means. The search can be completed and the reading can be resumed, and no interruptions in the sound occur.
In the optical disk reproducing apparatus according to the second aspect of the present invention, the position information and the recording data for each information unit are multiplexed and recorded, and the optical disk rotated at a speed higher than the speed for obtaining the predetermined reproduction output rate is irradiated with the light beam and reflected. Light detection means for detecting a recording signal by receiving a beam, and a tracking error signal indicating an error between the reading track on the optical disc and the irradiation position of the light beam, and the irradiation position of the light beam based on the tracking error signal Tracking servo means for controlling the correction of the light beam, and a focus servo for generating a focus error signal indicating an error between the signal surface of the optical disk and the focal point of the light beam, and performing the correction control of the focal point of the light beam based on the focus error signal And a thread error signal indicating an error between the reading track on the optical disk and the position of the light detecting means. And a thread servo means for controlling the correction of the position of the light detection means based on the thread error signal, and a signal processing means for demodulating and outputting the recording data and position information of the optical disk from the detection output of the light detection means. Recording data reading means, storage means having a capacity for storing a predetermined amount of recording data, and recording data output at a high rate from the signal processing means are written to the storage means, and predetermined reproduction output is continuously performed from the storage means. Read and output at a rate to obtain the rate, and if the storage means is full of recorded data, the writing is interrupted and a full notification signal is generated, and when the remaining data amount in the storage means falls below a predetermined reference amount W Write / read control means for generating the occurrence notification signal, and when the full notification signal is issued, the current reading position information is input from the signal processing means and stored. In addition, when all or part of the recording data reading means is paused and a free space notification signal is issued, the recording data reading means is subjected to operation start control and search control of the last reading position of the previous time, After the search is completed, each information unit recorded on the optical disc includes an address control unit that causes the signal processing unit to resume the demodulated output of the recording data and the writing / reading control unit to resume the writing operation. It is composed of one continuous recording section in which data is continuously recorded in order or a combination of a plurality of continuous recording sections whose combination order is determined, and an information unit is configured for each information unit on the optical disc Combined when the position of continuous recording section and one information unit are composed of a combination of multiple continuous recording sections Management information indicating the order is recorded, the reference amount W used by the writing / reading control means is variable, and the reproduction control means receives the current input from the signal processing means when a full notification signal is issued. Is compared with the management information read from the optical disc in advance, and within a certain distance from the end position of the continuous recording section being read. In Whether or not Said Within a certain distance from the end position In If not, decrease the reference amount W, Said Within a certain distance from the end position In In addition, the end position of the continuous recording section being read is the start position of the continuous recording section to be reproduced next. And physically continuous on the optical disc Whether or not Physically continuous In this case, decrease the reference amount W, Not physically continuous The case is characterized in that the reference amount W is increased.
According to the second aspect of the present invention, when the storage means is full of recording data, the current reading position information input from the signal processing means is collated with the management information read from the optical disk in advance and read. Within a certain distance from the end of the continuous recording section In Whether or not Said Within a certain distance from the end position In If not, decrease the reference amount W, Said Within a certain distance from the end position In In addition, the end position of the continuous recording section being read is the start position of the continuous recording section to be reproduced next. And is physically continuous Whether or not Physically continuous In this case, decrease the reference amount W, Not physically continuous In this case, the reference amount W is increased. As a result, within a certain distance from the end position of the continuous recording section In No playback or within a certain distance from the end of the continuous recording section In However, the start position of the next continuous recording section Not in In this case, since the rest period of the reading system becomes longer and the cycle cycle of operation and rest becomes longer, power consumption can be suppressed. Also, if the storage means happens to be full of recorded data, it is within a certain distance from the end position of the continuous recording section that was being read. Enter In addition, even if the head of the continuous recording section to be read next is separated, the pause period of the reading system is shortened, so that the head of the continuous recording section to be surely read next while remaining data exists in the storage means Can complete the search and no interruptions in the sound occur.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, one embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a block diagram showing the configuration of a battery-powered portable MD player according to the present invention.
Reference numeral 1 denotes a recording MD, and among tracks formed in a spiral shape from the inner periphery to the outer periphery, an address as position information and compressed music data for each song are multiplexed and recorded in the program area. For each song, management information (UTC information) indicating the position and order of continuous recording sections constituting the song is recorded in the UTOC area on the inner periphery side of the program area. Reference numeral 2 denotes a spindle motor that rotates the recording MD 1 at a constant linear speed that is approximately five times faster than the required linear speed at which a predetermined reproduction output rate is obtained, and is rotationally controlled by a spindle servo system (not shown). An optical pickup 3 irradiates the current reading track of the recording MD 1 with a light beam, receives a reflected beam, and outputs a light detection signal. The optical pickup 3 includes a focus actuator 3c that moves the objective lens 3a in a direction perpendicular to the recording MD1, and a tracking actuator 3b that moves the objective lens 3a in the disk radial direction of the recording MD1.
[0012]
Reference numeral 4 denotes a head amplifier, which is a circuit (not shown) for creating an RF signal from the light detection signal of the optical pickup 3, and the focal point of the light beam viewed from the light detection signal of the optical pickup 3 in the perpendicular direction of the disk of the recording MD1. A circuit (not shown) for generating a focus error signal FE indicating an error between the signal surface of the reproduction MD 1 and the irradiation position of the light beam viewed from the optical detection signal of the optical pickup 3 in the disc radial direction of the recording MD 1 A circuit (not shown) for generating a tracking error signal TE indicating an error from the reading track of the recording MD 1 is provided, and outputs an RF signal, a focus error signal FE, and a tracking error signal TE. The head amplifier 4 also has a function of monitoring an abnormality of the RF signal due to a shock and outputting a shock detection signal SK when the abnormality occurs.
[0013]
Reference numeral 5 denotes a digital signal processing circuit, which receives an RF signal from the head amplifier 4 and demodulates and outputs the compressed music data as the recording data in the program area and the address as the position information, or the recording data in the UTOC area. The UTOC information and the address which is the position information are demodulated and output. A focus control circuit 6 receives the focus error signal FE while the focus servo is on, performs phase compensation and gain adjustment, and outputs the result to the driver 7. The driver 7 drives the focus coil of the focus actuator 3c, and moves the objective lens 3a in a direction that cancels the error between the focal point of the light beam and the signal surface of the recording MD1. The focus control circuit 6 has a function of performing a focus search in the focus off state and turning on the focus servo. A focus servo system is configured by the circuit that generates the focus error signal FE of the head amplifier 4, the focus control circuit 6, the driver 7, and the focus actuator 3c.
[0014]
A tracking control circuit 8 receives the tracking error signal TE while the tracking servo is on, performs phase compensation and gain adjustment, and outputs it to the driver 9. The driver 9 drives the tracking coil of the tracking actuator 3b, and moves the objective lens 3a in a direction to cancel the error in the disc radial direction between the irradiation position of the light beam and the track of the recording MD1. The tracking control circuit 8 also has a function of turning on the tracking servo from the tracking servo-off state and causing the light beam irradiation position to track jump in a desired direction by a desired amount in accordance with search control of the system controller. A tracking servo system is configured by the circuit that generates the tracking error signal TE of the head amplifier 4, the tracking control circuit 8, the driver 9, and the tracking actuator 3b.
[0015]
10 shows the low frequency component of the output of the driver 9, and the position of the track being read by the recording MD 1 and the position of the optical pickup 3 (when the tracking servo is turned off and the objective lens 3a returns to the neutral position when viewed in the disk radial direction) A filter for generating a thread error signal SE proportional to an error in the radial direction of the disk (thread error) with respect to the optical axis of the objective lens 3a), 11 is a thread control circuit having a microcomputer configuration, and inputs the thread error signal SE. When the magnitude of the thread error signal SE exceeds a predetermined threshold value, a drive signal is output to the driver 12, the thread motor 13 is driven, and a predetermined amount of the optical pickup 3 is moved in the direction to cancel the thread error. Move to make the thread error almost zero. The sled control circuit 11 also has a function of outputting a drive signal to the driver 12 to drive the sled motor 13 and moving the optical pickup 3 in a desired direction by a desired amount according to the search control of the system controller. The filter 10, the thread control circuit 11, the driver 12, and the thread motor 13 constitute a thread servo system.
[0016]
The spindle motor 2, the optical pickup 3, the head amplifier 4, the digital signal processing circuit 5, and various servo systems such as focus servo, tracking servo, thread servo, and spindle servo constitute a compressed music data reading system. This compressed music data reading system shifts to the sleep state under the control of the system controller or resumes the operation from the sleep state for power saving during the reproduction of the recording MD 1.
[0017]
Reference numeral 14 denotes a DRAM as a shock-proof memory having a capacity capable of storing compressed music data for about 3 to 10 seconds. Reference numeral 15 denotes a microcomputer-proof shock-proof memory controller. During reproduction, the DRAM 14 receives a predetermined reproduction output rate (described later). This is an output rate based on the standard of music data from the ATRAC decoder, and in the case of an MD player, the compressed music data is continuously read out at a rate at which a sampling frequency of 44.1 kHz is obtained and output to the subsequent stage. Further, during playback, the shock proof memory controller 15 writes compressed music data output from the digital signal processing circuit 5 at a high rate of about five times the read rate to the DRAM 14, and writes when the DRAM 14 is full of compressed music data. Is interrupted to generate a full notification signal and output it to the system controller. Then, when the compressed music data is read thereafter, the remaining data amount of the DRAM 14 becomes a predetermined reference amount (this is assumed to be W) or less, and when the DRAM 14 has a predetermined amount or more of free space, a free space notification signal is output. When there is a write permission notification signal, writing of compressed music data is resumed. Further, the shock proof memory controller 15 interrupts the write operation when receiving a write interruption command due to the occurrence of a shock during writing to the DRAM 14, and then resumes the write operation when receiving a write restart command. W is set by the system controller. ₁ And W ₂ (However, W ₁ And W ₂ Is a predetermined fixed value and W ₁ <W ₂ In the relationship of
[0018]
16 is an ATRAC decoder that decompresses the compressed music data and outputs the music data at a predetermined playback output rate (44.1 kHz sampling frequency defined by the standard), and 17 is a D / A converter that outputs the music data after D / A conversion. / A converter. The DRAM 14, the shock proof memory controller 15, the ATRAC decoder 16, and the D / A converter 17 are always in an operating state during reproduction of the recording MD1.
[0019]
Reference numeral 18 denotes a system controller having a microcomputer configuration, which controls the entire reproduction control operation. That is, when the program area is reproduced, the DRAM 14, the shock proof memory controller 15, the ATRAC decoder 16, and the D / A converter 17 are continuously operated, and the shock proof memory controller 15 continuously receives a predetermined value from the DRAM 14. The compressed music data is read out and output to the ATRAC decoder 16 at a rate at which a reproduction output rate can be obtained. On the other hand, the reading system comprising the spindle motor 2, the optical pickup 3, the head amplifier 4, the digital signal processing circuit 5, and various servo systems alternately repeats the operating state and the resting state, and the recording MD 1 is used while the reading system is in operation. While rotating at a constant linear velocity of about 5 times the linear velocity at which a predetermined reproduction output rate is obtained, the compressed music data from the reproduction MD1 is high-rate (about five times the rate at which the predetermined reproduction output rate is obtained). And read by the shock proof memory controller 15 into the DRAM 14. When a shock occurs during operation of the reading system, the shock proof memory controller 15 interrupts writing, while controlling the reading system to search for the address from which the compressed music data was read immediately before the occurrence of the shock. After completion, the reading system restarts reading of the compressed music data, and at the same time, the shock proof memory controller 15 restarts writing.
[0020]
Further, when the system controller 18 pauses the reading system, it collates the previous reading position with the UTOC information, and determines whether or not the position is within two clusters from the end position of the continuous recording section that has been being read. If YES, the reference amount used by the shock proof memory controller 15 for determining whether the DRAM 14 is empty is W ₁ If NO, the reference amount used by the shock proof memory controller 16 to determine the occurrence of free space is W ₂ Switch to.
[0021]
In this embodiment, W ₁ When a shock occurs during reading of compressed music data from the program area of the recording MD1, the minimum amount of time w required from the occurrence of the shock to the completion of the search for the reading position immediately before the occurrence of the shock _a (The minimum time required from the occurrence of a shock to the completion of the search for the reading position immediately before the occurrence of the shock _a When w _a = T _a / T ₁ The number of compressed music data) and the reading of the compressed music data from the program area of the recording MD1 is resumed from a paused state, so it is necessary to complete the pause position search after starting the reading system. Minimum time w _b (The minimum time required to complete the pause position search after starting the reading system is _b When w _b = T _b / T ₁ Of compressed music data), whichever is larger (this is w _c )). W ₂ While reading compressed music data in the program area, the reading is interrupted at an arbitrary position, and when searching for another arbitrary position and restarting the reading, the minimum amount of time w required from the start to the end of the search is _d (The minimum time required from the start of search to completion is T _d As w _d = T _d / T ₁ Of compressed music data) and w _c And is set to the sum.
[0022]
Further, when the recording MD 1 is loaded, the system controller 18 controls the reading system to read the UTOC information recorded in the UTOC area, and stores it in a built-in memory (not shown).
[0023]
2 and 3 are flowcharts showing the playback control process by the system controller 18, and FIGS. 4 and 5 are flowcharts showing the write / read control process of the shock proof memory controller 15, which will be described below with reference to these figures. The operation of the embodiment will be described. Note that the recording contents of the recording MD 1 are as shown in FIG. 8 (2), and the UTOC information is read from the recording MD 1 and stored in the built-in memory of the system controller 18. Assume that no data exists in the DRAM 14. Further, the input period of the compressed music data required for the ATRAC decoder 16 to output the decompressed music data at the standard rate is set to T ₁ And
[0024]
When the user gives a playback command by pressing the PLAY key (not shown) while the optical pickup 3 is waiting at the head position of the program area, the system controller 18 causes the spindle motor 2, the optical pickup 3, the head amplifier 4, the digital Operation start control is performed on the signal processing circuit 5, the reading system including various servo systems, the DRAM 14, the shock proof memory controller 15, the ATRAC decoder 16, the D / A converter 17, and a power amplifier (not shown). Step S10 in FIG. When the focus control circuit 6 of the focus servo system shifts to the operating state, it first performs a focus search and turns on the focus servo. When the tracking control circuit 8 of the tracking servo system shifts to the operating state, it first turns on the tracking servo when the tracking error signal TE is in the negative feedback region. As a result, an RF signal is output from the head amplifier 4. When the digital signal processing circuit 5 shifts to the operating state, the digital signal processing circuit 5 generates a CLV control signal from the RF signal and outputs it to a driver (not shown) of the spindle motor 2, and the spindle motor 2 outputs the recording MD 1 to a predetermined reproduction output rate. Is rotated at a constant linear velocity that is approximately five times faster than the linear velocity at which is obtained.
[0025]
Following step S10, the system controller 18 controls the reading system with reference to the UTOC information, searches for the start position a of the first continuous recording section A of the first song, and writes it to the shock proof memory controller 15 after the search is completed. An permission notification signal is sent (steps S11 and S12). Then, the digital signal processing circuit 5 starts the demodulating operation of the compressed music data, demodulates the compressed music data from the RF signal, and outputs it to the shock proof memory controller 15 (step S13). The digital signal processing circuit 5 also demodulates the address while demodulating the compressed music data. The system controller 15 inputs the address and refers to the UTOC information to determine whether the current reading position has reached the end position b of the continuous recording section A that is currently being read (step S14).
[0026]
If NO, it is checked whether a full notification signal is input from the shock proof memory controller 15 and whether a shock has occurred and a shock detection signal SK has been input (step S15, step S30 in FIG. 3). If NO, the process returns to step S13. In this way, the reading of the compressed music data and the address is continued for a while from the start position a of the first continuous recording section A of the first song by the reading system. Since the light beam traces the track by the action of the tracking servo system, the average position of the objective lens 3a viewed in the radial direction of the disk gradually moves outward in the radial direction of the recording MD1, and from the filter 10. The error (thread error) indicated by the output thread error signal SE gradually increases in the-direction (here, the outside in the disk radial direction is set to +).
[0027]
When the thread control circuit 11 is in an operating state, the magnitude of the thread error signal SE is compared with a predetermined threshold value, and if it is smaller than the threshold value, the rotation control of the thread motor 13 is not performed and the movement of the optical pickup 3 is not performed. do not do. If the trace of the track due to only the movement of the objective lens 3a comes close to the limit and the magnitude of the thread error signal SE becomes larger than a predetermined threshold value, a control signal is output to the driver 12. The thread motor 13 is driven, and the optical pickup 3 is moved in a direction to cancel the thread error by a predetermined amount, so that the thread error is almost zero. Thereafter, by repeating the same operation, the light beam can be traced over the entire program area.
[0028]
On the other hand, the shock proof memory controller 15 after the operation state is cleared both the flag F indicating whether the DRAM 14 is full and the flag G indicating whether writing is interrupted due to the occurrence of the shock (FIG. 4). Thereafter, when a write permission notice is received, new compressed music data is inputted from the digital signal processing circuit 5 to the DRAM 14 (steps S41 to S43).
[0029]
Next, since the DRAM 14 is not full of compressed music data and the compressed music data has not been read from the DRAM 14 (NO in steps S44 and S45), the first compressed music data is read from the DRAM 14 and the ATRAC decoder 16 is read. (Step S46). Then, since G is not 1, it is checked whether a write interruption command is input from the system controller 18 (steps S47 and S48). Here, NO is determined and F is not 1 (NO in step S49), and the process proceeds to step S50. Check if the next new compressed music data is input. If NO, the process proceeds to step S51, where a predetermined time T has elapsed since the compressed music data was read last time. ₁ It is checked whether or not only elapses. If NO in this case, the process proceeds to step S47 to perform the same processing as described above.
[0030]
Thereafter, if the next new compressed music data is input, YES is determined in the step S50, and it is written in the DRAM 14 (step S43). Subsequently, since the DRAM 14 is not yet full of compressed music data, NO is determined in step S44, and NO is determined in step S45. Therefore, the process proceeds to step S51, and the time T after the previous compressed music data is read ₁ It is checked whether or not only elapses. If NO in this case, the process proceeds to step S47 to perform the same processing as described above. Thereafter, if “YES” is determined in the step S51, the second compressed music data is read from the DRAM 14 and outputted to the ATRAC decoder 16 (step S46). Thereafter, the same processing is repeated, and from the DRAM 14 to T ₁ The compressed music data is written at about five times the speed while the compressed music data is read out at a period of. The ATRAC decoder 16 decompresses the input compressed music data and outputs the decompressed music data at a predetermined reproduction output rate.
[0031]
When the DRAM 14 is full of compressed music data (YES in step S44), a full notification signal is output to the system controller 18 and F is set to 1 (step S52). When F = 1, the shock-proof memory controller 15 does not write to the DRAM 14 (YES in step S49 and does not proceed to step S50), and the cycle T ₁ Only the reading at is continued (steps S51 and S46). Then, it is periodically checked whether the remaining data amount of the DRAM 14 is equal to or smaller than a predetermined reference amount W (this W is variable by interrupt processing when there is an input from the system controller 18 as will be described later) (step S53), if YES, a vacancy occurrence notification signal indicating that a vacant space of a predetermined amount or more has been generated is output, and waiting for a write permission notification signal to be sent while the compressed music data is being read (steps S54, S55). , S51, S46 to S49, S53).
[0032]
Upon receiving the full notification signal, the system controller 18 stores the address indicating the current reading position input from the digital signal processing circuit 5 as a pause position (steps S15 and S16 in FIG. 2) and then stores it in the built-in memory. With reference to the UTOC information, it is checked whether the pause position is within 2 clusters from the end position b of the continuous recording section A from which the compressed music data has been read so far (step S17). If it is still NO, W ₁ Is output to the shock proof memory controller 15 (step S18). Then, the entire reading system is suspended and the operation is suspended. After that, the remaining data amount of the DRAM 14 is W = W ₁ The process waits until a predetermined amount or more of space is available in the DRAM 14 (steps S19 and S20). The shock proof memory controller 15 executes the interrupt process shown in FIG. ₁ When W is entered, W registered in the built-in memory (not shown) is changed to W ₁ (Steps S60 and S61).
[0033]
The remaining data amount of the DRAM 14 is W = W ₁ When an empty occurrence notification signal is input from the shock proof memory controller 15, the system controller 18 determines YES in step S20 of FIG. 2, performs operation start control on the entire reading system, and restarts the operation (step S21). ). W ₁ Is small, the rest period of this reading system becomes long. Subsequent to step S21, search control of the previously stored pause position is performed for the reading system (step S22). After the search is completed, a write permission notification signal is output to the shock proof memory controller 15 and demodulated to the digital signal processing circuit 5. The output is resumed (steps S12 and S13).
At this time, since the pause position of this time is not within two clusters from the end position b of the continuous recording section A that was being read, immediately after the reading of the compressed music data is resumed, the pause position immediately reaches the end position b of the continuous recording section A. Therefore, there is no need to search for the start position of the continuous recording section to be reproduced next, and the remaining data amount of the DRAM 14 does not become zero even if the reading of the compressed music data is continued.
[0034]
The shock-proof memory controller 15 that has received the write permission notification determines YES in step S55 of FIG. 4 and clears F (step S56). As a result, the writing of the compressed music data to the DRAM 14 is resumed (steps S50 and S43). Thereafter, by repeating the same operation, the reading system operates intermittently, and the compressed music data is at a high rate about 5 times the rate at which a predetermined reproduction output rate is obtained intermittently from the program area of the recording MD1. Is read and written to the DRAM 14, and the compressed music data is read from the DRAM 14 at a rate at which a predetermined reproduction output rate can be continuously obtained. The compressed music data is decompressed by the ATRAC decoder 16 and output to the D / A converter 17 at a predetermined reproduction output rate defined by the standard. The D / A converter 17 D / A converts the decompressed music data and outputs it to a power amplifier (not shown).
[0035]
In this way, the reproduction of the first continuous recording section A of the first song of the recording MD 1 is executed, but until the end position b is within 2 clusters, W ₁ Since it is determined whether or not the DRAM 14 is vacant based on the reference amount, the rest period of the reading system becomes longer and the cycle period of operation and rest becomes longer, so that power consumption can be greatly suppressed.
[0036]
Thereafter, when the current reading position is within two clusters from the end position b of the continuous recording section A, the DRAM 14 becomes full, and when YES is determined in step S15, the system controller 18 stores the current position as a pause position. In step S17, “YES” is determined. At this time, W is used as a reference amount for determining occurrence of empty space. ₂ (> W ₁ ) Is output to the shock proof memory controller 15 (step S23), the rest of the reading system is suspended and the operation is suspended. ₂ The process waits until a predetermined amount or more is available (steps S19 and S20). W ₂ The shock proof memory controller 15 receives the W registered in the built-in memory (not shown) in the interrupt process of FIG. ₂ (Steps S60 and S61).
[0037]
The remaining data amount of the DRAM 14 is W = W ₂ When an empty occurrence notification signal is input from the shock proof memory controller 15, the system controller 18 determines YES in step S20 of FIG. 2, performs operation start control on the entire reading system, and restarts the operation (step S21). ). W ₂ Therefore, the rest period of this reading system is shortened. Subsequent to step S21, search control of the previously stored pause position is performed for the reading system (step S22). After the search is completed, a write permission notice is given to the shock proof memory controller 15, and a demodulated output is sent to the digital signal processing circuit 5. It is restarted (steps S12 and S13).
[0038]
At this time, since the pause position of this time is within 2 clusters from the end position b of the continuous recording section A that was previously read, the end position of the continuous recording section A immediately after the reading of the compressed music data is resumed. b is reached. Then, the system controller 18 determines YES in step S14, refers to the UTOC information, and checks whether there is a continuous recording section to be reproduced next in the order of the music (step S24). Here, since the second continuous recording section D of the first song corresponds, the end position b of the continuous recording section A from which the compressed music data has been read until now, and the start position of the continuous recording section to be reproduced next time Is a continuous recording section physically connected to each other (step S25). If it is a continuous recording section that is physically connected, the reading can be continued as it is along the track, and the process proceeds to step S15. Here, the end position b of the continuous recording section A and the continuous recording section D are processed. Since the address of the start position g is “NO” (see FIG. 8B), a write interruption command is given to the shockproof memory controller 15 to interrupt the write operation to the DRAM 14 and refer to the UTOC information. Then, the reading system is controlled to search for the start position g of the continuous recording section D, and g is searched (steps S26 and S27). After the search is completed, a write permission notice is given to the shock proof memory controller 15 to cause the digital signal processing circuit 5 to resume demodulation output (steps S12 and S13). Thereby, based on the compressed music data recorded in the continuous recording section D, the reproduction of the music number 1 continues.
[0039]
In this way, when the DRAM 14 is full and the reading position when the reading of compressed music data by the reading system is interrupted is near the end position of the continuous recording section, the end position and the next continuous recording section to be reproduced are displayed. Even if the start position is far away, the remaining data amount of DRAM 14 is W ₂ (> W ₁ ), The reading of compressed music data by the reading system is resumed, so when the reading system resumes operation, the pause position is searched, and the compressed music data is read a little, and then the next continuous recording immediately away Even if a search for the start position of the section is performed, the remaining data amount of the DRAM 14 does not become zero, and sound interruption does not occur.
[0040]
For a while after the transition to the reproduction of the continuous recording section D, since the reading position is away from the end position h of the continuous recording section D, the DRAM 14 becomes full and every time there is a full notification, the system controller 18 performs step S17. NO and W ₁ Is output, and the rest period of the reading system becomes longer and the cycle of operation and rest of the reading system becomes longer, so that power consumption can be suppressed.
[0041]
Thereafter, when the DRAM 14 becomes full with the current reading position within two clusters from the end position h of the continuous recording section D, the system controller 18 ₂ Is output to stop the reading system (steps S15, S16, S17, S23), and the remaining data amount of the DRAM 14 is W = W ₂ When there is a vacant occurrence notification below, the reading system is restarted, the previously stored pause position search control is performed, and after the search is completed, the digital signal processing circuit 5 restarts the demodulation output (steps S19 to S22, S12). , S13).
[0042]
At this time, since the pause position of this time is within 2 clusters from the end position h of the continuous recording section D that has been read up to now, the end position of the continuous recording section D immediately after the reading of the compressed music data is resumed. Reach h. Then, the system controller 18 determines YES in step S14, refers to the UTOC information, and checks whether there is a continuous recording section to be reproduced next in the order of the music (step S24). Here, since the first continuous recording section B of the second song corresponds, the end position h of the continuous recording section D where the compressed music data has been read up to now and the start position of the continuous recording section to be reproduced next are It is determined whether they are physically connected (step S25). If it is a continuous recording section that is physically connected, the reading can be continued as it is along the track, and the process proceeds to step S15. Here, the end position h of the continuous recording section D and the continuous recording section B are processed. Since the address of the start position c is NO and the result is NO (see FIG. 8 (2)), a write interruption command is given to the shockproof memory controller 15 to interrupt the write operation to the DRAM 14, and the UTOC information is referred to. Then, search control of the start position c of the continuous recording section B is performed on the reading system (steps S26 and S27). After the search is completed, the digital signal processing circuit 5 restarts the demodulation output (steps S12 and S13). Thereby, based on the compressed music data recorded in the continuous recording section B, the reproduction of the music number 2 starts. At this time, the remaining data amount is W ₂ Since the operation is resumed at that time, the remaining data amount of the DRAM 14 does not become zero, and no sound interruption occurs.
[0043]
Since the end position d is separated for a while after the transition to the reproduction of the continuous recording section B, the DRAM 14 becomes full, and whenever there is a full notification, the system controller 18 determines NO in step S17 and determines W ₁ Is output, and the rest period of the reading system becomes longer and the cycle of operation and rest of the reading system becomes longer, so that power consumption can be suppressed.
[0044]
Thereafter, when the DRAM 14 becomes full with the current reading position within two clusters from the end position d of the continuous recording section B, the system controller 18 ₂ Is output to stop the reading system (steps S15, S16, S17, S23), and the remaining data amount of the DRAM 14 is W = W ₂ When there is a vacant occurrence notification below, the reading system is restarted, the previously stored pause position search control is performed, and after the search is completed, the digital signal processing circuit 5 restarts the demodulation output (steps S19 to S22, S12). , S13).
[0045]
At this time, since the pause position of this time is within 2 clusters from the end position d of the continuous recording section B that was previously read, the end position of the continuous recording section B is immediately after the reading of the compressed music data is resumed. d is reached. Then, the system controller 18 determines YES in step S14, refers to the UTOC information, and checks whether there is a continuous recording section to be reproduced next in the order of the music (step S24). Here, since the second continuous recording section C of the second song corresponds, the end position d of the continuous recording section B from which the compressed music data has been read and the start position of the continuous recording section to be reproduced next are Is physically connected (step S25). Since this time is YES, the process proceeds to step S15, and reading of the compressed music data is continued as it is.
[0046]
Since the end position f is separated for a while after the transition to the reproduction of the continuous recording section C, the DRAM 14 becomes full, and whenever there is a full notification, the system controller 18 determines NO in step S17 and determines W ₁ Is output, and the rest period of the reading system becomes longer and the cycle of operation and rest of the reading system becomes longer, so that power consumption can be suppressed.
[0047]
Thereafter, when the DRAM 14 becomes full with the current reading position within two clusters from the end position f of the continuous recording section C, the system controller 18 ₂ Is output to stop the reading system (steps S15, S16, S17, S23), and the remaining data amount of the DRAM 14 is W = W ₂ When there is a vacant occurrence notification below, the reading system is restarted, the previously stored pause position search control is performed, and after the search is completed, the digital signal processing circuit 5 restarts the demodulation output (steps S19 to S22, S12). , S13).
[0048]
At this time, since the pause position of this time is within 2 clusters from the end position f of the continuous recording section C which was previously read, the end position of the continuous recording section C is immediately after the reading of the compressed music data is resumed. f is reached. Then, the system controller 18 determines YES in step S14, refers to the UTOC information, and checks whether there is a continuous recording section to be reproduced next in the order of the music (step S24). Since it does not exist here, the process proceeds to step S28, and the reading system and each part including the shock proof memory controller 15, the ATRAC decoder 16, the D / A converter 17, the power amplifier, etc. are paused to reproduce the recording MD1. Finish.
[0049]
When a shock occurs during playback and a shock detection signal SK is input from the head amplifier 4, the system controller 18 temporarily stores the latest input address as return position information and interrupts writing to the shock proof memory controller 15. After the command notification signal is sent, the reading system is controlled to return to the return position. After the search is completed, the writing restart command notification signal is sent to the shock proof memory controller 15 and reading of the compressed music data is resumed (FIG. 3). Steps S30 to S34).
[0050]
The shock-proof memory controller 15 that has received the write interruption command notification sets G to 1 (steps S48 and S57), and thereafter suspends writing until receiving the write resumption command notification, and continues to read only the compressed music data (step S51, S57). S46, S47, S58). Thereafter, reading can be resumed in the reading system, and when a write resume command notification is received, G is cleared, and the parallel operation of writing and reading compressed music data is performed again (steps S58 and S59).
[0051]
According to this embodiment, during playback of the recorded recording MD 1, the system controller 18 causes the compressed music data reading system to read the compressed music data from the recording MD 1 at a predetermined high rate, and the shock proof memory controller 15. To the DRAM 14. During reproduction, the shock proof memory controller 15 continuously reads out the compressed music data from the DRAM 14 at a rate at which a predetermined reproduction output rate is obtained, and outputs it to the ATRAC decoder 16. When the DRAM 14 is full of compressed music data, the shock proof memory controller 15 stops writing, and the system controller 18 stores the current reading position as a pause position and pauses the entire reading system of the compressed music data. Thereafter, when the shock-proof memory controller 15 determines that the remaining data amount has become equal to or less than the reference amount W by reading the compressed music data from the DRAM 14, the system controller 18 starts the operation of the compressed music data reading system. First, the pause position is searched. After the search is completed, the digital signal processing circuit 5 restarts the demodulation output of the compressed music data, and the shock proof memory controller 15 restarts the writing to the DRAM 14. The reference amount W can be varied by the system controller 18, and when the DRAM 14 is full of compressed music data, the current read position information input from the digital signal processing circuit 5 is read from the recording MD1 in advance. (UTOC information) is compared to determine whether or not it is near the end position of the continuous recording section that has been read up to now, and is increased when it is close to the end position, and is decreased when it is not close to the end position. As a result, when the playback location is not near the end position of the continuous recording section, the rest period of the reading system is lengthened, and the cycle period of operation and rest of the reading system is lengthened, so that power consumption can be suppressed. Also, when the DRAM 14 becomes full of compressed music data, the reading system is restarted earlier if it is close to the end position of the continuous recording section being read. Even if the head of the data is separated, the search can be reliably completed and the reading can be resumed while the compressed music data remains in the DRAM 14, and no sound interruption occurs.
[0052]
In the above-described embodiment, when the reading system is paused intermittently during the reproduction of the recording MD, all of the reading system is paused, but only a part of the reading system including, for example, the tracking servo system. May be paused.
2 is not limited to 2 clusters or less, but may be other ranges such as 3 clusters or 4 clusters. In short, the continuous recording in which the pause position is being read. It suffices if it is possible to determine whether it is close to a certain distance from the end position of the section.
[0053]
When the DRAM 14 is full of compressed music data, the current reading position information input from the digital signal processing circuit 5 is checked against the management information (UTC information) read from the recording MD 1 in advance. It is determined whether or not it is near the end position of the continuous recording section, and if it is near the end position, the reference amount W is unconditionally increased, but FIG. 2 is modified as shown in FIG. If YES at step S70, it is determined whether or not there is a continuous recording section to be reproduced next with reference to the UTOC information (step S70 in FIG. 6). ₁ If there is, the continuous recording section that has been read until now Is physically connected on the recording MD 1 to the next recording position. Whether or not (step S71), YES If so, go to step S18. NO If so, go to step S23 ₂ May be output.
[0054]
According to FIG. 6, a portion that is not near the end position of the continuous recording section is being reproduced, or is near the end position of the continuous recording section, but the start position of the continuous recording section to be reproduced next is not separated, When the search is possible, the rest period of the reading system becomes longer and the cycle period of operation and rest becomes longer, so that power consumption can be suppressed. Also, when the DRAM 14 becomes full of compressed music data, even if the DRAM 14 is near the end position of the continuous recording section being read and the start position of the continuous recording section to be read next is separated, the DRAM 14 Thus, while the remaining data exists, the search can be completed reliably and the reading can be resumed, and no sound interruption occurs.
In addition The figure The discrimination criterion in step S17 in step 6 is not limited to within 2 clusters, but may be other ranges such as within 3 clusters, within 4 clusters, and in short, from the end position of the continuous recording section from which the pause position was read. It suffices if it is possible to determine whether it is within a certain range.
[0055]
Further, although the MD has been described as an example of the optical disk, another type of optical disk such as a DVD-RAM in which uncompressed music data is recorded in the program area may be used.
[0056]
【The invention's effect】
According to the first aspect of the present invention, each information unit recorded on the optical disc is composed of one continuous recording section in which data is continuously recorded in the order of addresses, or a plurality of combinations in which a combination order is determined. When the continuous recording section currently being read from the optical disc has been read, the next continuous recording section is read and the current reading position is the continuous reading section. Within a certain distance from the end of the recording section In Then, the storage means becomes full with the recording data, and the reference amount W of the remaining data amount of the storage means for resuming the reading after pausing is increased. Therefore, when the storage means becomes full of recorded data during reading and reading is paused, the reading position happens to be within a certain distance from the end position of the continuous recording section being read. In If the reference amount W increases, the operation of the reading system is resumed earlier. Therefore, after the reading is resumed, the end of the continuous recording section is reached immediately and the beginning of the next continuous recording section to be read must be searched. If the head position of the next continuous recording section to be read is separated, the search for the head of the next continuous recording section to be read is completed without fail even if there is remaining data in the storage means. Reading can be resumed and no interruptions in the sound occur. However, if W remains large, the cycle period of operation and suspension of the reading system is shortened and the suspension period per time is also shortened, which makes it difficult to suppress power consumption. In the present invention, the current reading position is within a certain distance from the end position of the continuous recording section being read. In When there is not, the reference amount W becomes small. When the reference amount W is reduced, the reading system pause period after the storage means becomes full of recording data is lengthened, and the cycle period of operation and pause is also lengthened, so that power consumption can be greatly suppressed.
According to the second aspect of the present invention, each information unit recorded on the optical disc is composed of one continuous recording section in which data is continuously recorded in the order of addresses, or a plurality of combination units determined in order of combination. When the continuous recording section currently being read from the optical disc has been read, the next continuous recording section is read and the current reading position is the continuous reading section. Within a certain distance from the end of the recording section In When there is not, the reference amount W becomes small. Therefore, the reading system pause period after the storage means becomes full of recording data is lengthened, and the cycle period of operation and pause is also lengthened, so that power consumption can be greatly suppressed. The current reading position is within a certain distance from the end position of the continuous recording section being read. Enter Thus, when the distance is more than a certain distance from the beginning of the continuous recording section to be read next, the storage means is filled with the recording data, and the reference amount W of the remaining data amount of the storage means for resuming the reading after pausing. Becomes larger. Therefore, when the storage means becomes full of recorded data during reading and reading is paused, the reading position happens to be within a certain distance from the end position of the continuous recording section being read. Enter The And the end position is Is it the start position of the next continuous recording section to be read? Separated If the reference amount W increases, the operation of the reading system is resumed earlier, so that immediately after the reading is resumed, the end of the continuous recording section is reached and the beginning of the next continuous recording section to be read is set. Even when the search has to be performed, the search at the beginning of the continuous recording section to be read next can be surely completed while the remaining data exists in the storage means, and the reading can be resumed, and no sound interruption occurs. The current reading position is within a certain distance from the end position of the continuous recording section being read. In But The end position is Is it the start position of the next continuous recording section to be read? Separated Please Not in In this case, since the storage means is full of recorded data and the reference amount W of the remaining data amount of the storage means for resuming after pausing reading is kept small, the pause period of the reading system becomes longer, The cycle period of operation and suspension becomes longer, and power consumption can be suppressed.
[Brief description of the drawings]
FIG. 1 is a block diagram of a portable MD player according to an embodiment of the present invention.
FIG. 2 is a flowchart showing playback control processing by the system controller in FIG. 1;
FIG. 3 is a flowchart showing playback control processing by the system controller in FIG. 1;
4 is a flowchart showing a write / read control process by a shock-proof memory controller in FIG. 1. FIG.
5 is a flowchart showing a write / read control process by the shock-proof memory controller in FIG. 1. FIG.
6 is a flowchart showing a modification of FIG.
FIG. 7 is an explanatory diagram of recorded contents of a recording MD.
FIG. 8 is an explanatory diagram of recorded contents of a recording MD.
[Explanation of symbols]
1 MD for playback 2 Spindle motor
3 Optical pickup 3a Objective lens
3b Tracking actuator 3c Focus actuator
4 Head amplifier 5 Digital signal processing circuit
6 Focus control circuit 7, 9, 12 Driver
8 Tracking control circuit 10 Filter
11 Thread control circuit 14 DRAM
15 Shockproof memory controller
16 ATRAC decoder 17 D / A converter
18 System controller

Claims (2)

Light detection that multiplex-records position information and recording data for each information unit, irradiates the optical disk rotated at a speed higher than the speed for obtaining a predetermined reproduction output rate, and detects the recording signal by receiving the reflected beam A tracking servo means for creating a tracking error signal indicating an error between the reading track on the optical disc and the irradiation position of the light beam, and a correction control of the irradiation position of the light beam based on the tracking error signal; A focus error signal indicating an error between the surface and the focal point of the light beam, and a focus servo means for controlling the correction of the focal point of the light beam based on the focus error signal; a reading track on the optical disc; A thread error signal indicating an error from the position is created, and based on the thread error signal, the light detection means And thread servo means for the correction control of the location, the record data reading means includes signal processing means for outputting the detection output of the light detection means demodulates the recorded data and the position information of the optical disc, and
Storage means having a capacity for storing a predetermined amount of recording data;
If the recording data output at a high rate from the signal processing means is written to the storage means, and is continuously read out from the storage means at a rate for obtaining a predetermined reproduction output rate, and the storage means is filled with the recording data. Writing / reading control means for generating a free notification signal when the writing is interrupted and a full notification signal is generated, and the remaining data amount in the storage means falls below a predetermined reference amount W;
When the full notification signal is issued, the current reading position information is input and stored from the signal processing means, and the suspension control is performed on all or part of the recording data reading means, and when the empty occurrence notification signal is issued, Performs operation start control and search control of the last reading position for the recording data reading means, and after the search is completed, the signal processing means restarts the demodulated output of the recording data, and the writing / reading control means restarts the writing operation. Playback control means;
Including
Each information unit recorded on the optical disc is composed of one continuous recording section in which data is continuously recorded in the order of addresses, or a combination of a plurality of continuous recording sections whose combination order is determined. In addition, for each information unit, management information indicating the combination order in the case where each information unit is composed of a combination of a plurality of continuous recording sections and a position of a continuous recording section and one information unit is recorded on each optical unit. And
The reference amount W used by the writing / reading control means is variable,
Further, when the full notification signal is issued, the reproduction control means collates the current reading position information input from the signal processing means with the management information read from the optical disc in advance, and continuously determines whether the end position of the recording interval has entered constant within, if contained constant within from the end position, to increase the reference amount W used by the write / read control means, within a predetermined from the end position If not in, it has to be reduced reference amount W,
An optical disc reproducing apparatus characterized by the above. Light detection that multiplex-records position information and recording data for each information unit, irradiates the optical disk rotated at a speed higher than the speed for obtaining a predetermined reproduction output rate, and detects the recording signal by receiving the reflected beam A tracking servo means for creating a tracking error signal indicating an error between the reading track on the optical disc and the irradiation position of the light beam, and a correction control of the irradiation position of the light beam based on the tracking error signal; A focus error signal indicating an error between the surface and the focal point of the light beam, and a focus servo means for controlling the correction of the focal point of the light beam based on the focus error signal; a reading track on the optical disc; A thread error signal indicating an error from the position is created, and based on the thread error signal, the light detection means And thread servo means for the correction control of the location, the record data reading means includes signal processing means for outputting the detection output of the light detection means demodulates the recorded data and the position information of the optical disc, and
Storage means having a capacity for storing a predetermined amount of recording data;
If the recording data output at a high rate from the signal processing means is written to the storage means, and is continuously read out from the storage means at a rate for obtaining a predetermined reproduction output rate, and the storage means is filled with the recording data. Writing / reading control means for generating a free notification signal when the writing is interrupted and a full notification signal is generated, and the remaining data amount in the storage means falls below a predetermined reference amount W;
When the full notification signal is issued, the current reading position information is input and stored from the signal processing means, and the suspension control is performed on all or part of the recording data reading means, and when the empty occurrence notification signal is issued, Performs operation start control and search control of the last reading position for the recording data reading means, and after the search is completed, the signal processing means restarts the demodulated output of the recording data, and the writing / reading control means restarts the writing operation. Playback control means;
Including
Each information unit recorded on the optical disc is composed of one continuous recording section in which data is continuously recorded in the order of addresses, or a combination of a plurality of continuous recording sections whose combination order is determined. In addition, for each information unit, management information indicating the combination order in the case where each information unit is composed of a combination of a plurality of continuous recording sections and a position of a continuous recording section and one information unit is recorded on each optical unit. And
The reference amount W used by the writing / reading control means is variable,
Further, when the full notification signal is issued, the reproduction control means collates the current reading position information input from the signal processing means with the management information read from the optical disc in advance, and continuously whether from the end position of the recording interval has entered constant within determined, the case from the end position does not contain within constant to reduce the reference amount W, if contained in a fixed within the said end position is further If the end position of the continuous recording interval was being read physically it decides whether or not are consecutive then on the start position of sequential recording sections to be reproduced and the optical disk is physically continuous The reference amount W is reduced, and when the physical amount is not continuous, the reference amount W is increased.
An optical disc reproducing apparatus characterized by the above.

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