JPH06103737A - Audio signal reproducing device - Google Patents

Abstract

PURPOSE:To easily reproduce audio data in time series by recording recording date and time information of the audio data in a prescribed area and selectively reproducing the data in accordance with these recording date and time at the time of reproducing. CONSTITUTION:Recorded date and time are included together with information about audio data in a TOC of a disk 1 at the time of recording. At the time of reproducing, when a time base reproducing mode is set by a key operating part K 41, this is discriminated by a system control part 20, and the recording date and time information is taken out of the TOC, and then reproducing processing is performed in time series in accordance with its setting in descending order or ascending order. Then, at the time of a selecting mode, reproduction is performed only by retrieving specified recording date and time. By this method, plural audio data can easily be reproduced in time series or selections.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal reproducing apparatus.

[0002]

2. Description of the Related Art Conventionally, a digital audio disc, that is, a so-called compact disc has information about recorded audio data recorded at a track position on the innermost circumference thereof. This is generally the TOC (Table of c
Ontent), which includes the number of recorded songs, the song number (track number) of each song, playing time, information about the recording position, and the like.

By using this TOC, it is easy to search for the recording start point of a song on the disc, that is, to find the beginning of the song. Therefore, in a compact disc reproducing apparatus, a plurality of songs recorded on one disc can be recorded. , In addition to the normal playback that is continuously played back in the order of song numbers (recording position order), the song numbers of each song are randomly rearranged by so-called program playback or continuous playback in the order set by the user. It is possible to perform so-called shuffle reproduction in which continuous reproduction is performed.

This shuffle reproduction is suitable for so-called background music because the order of reproduction of music is different every time even when a single disc is reproduced a plurality of times, so that the listener is less conscious of repetition.

[0005]

By the way, there has been proposed an apparatus for recording and reproducing an audio signal by using a magneto-optical disk. In such discs that can be recorded by the user, it is considered that the discs are often recorded at different dates and times.
In addition, a new audio signal may be recorded by erasing a recording portion that is no longer needed.

In the reproduction of such a disc, there are cases where it is desired to perform reproduction in order from the oldest recorded one or the newest recorded one. In this case, for example,
If the user makes a note of the recording date and time of each song, the time-series reproduction can be performed by setting the time-series reproduction order according to the memo and performing the program reproduction.
However, in that case, a note must be taken each time when recording. What's more, you have to save the memo with the disc. Furthermore, the troublesome work of setting the playback order while viewing the memo for the program playback was necessary. It is an object of the present invention to provide an audio signal reproducing apparatus which can solve the above drawbacks.

[0007]

SUMMARY OF THE INVENTION The present invention is an audio signal reproducing apparatus using a medium in which information of recording dates and times of a plurality of audio data is recorded in respective predetermined areas, and the recording is performed on the medium. It is characterized in that a plurality of audio data are reproduced according to the date and time information.

[0008]

According to this structure, the audio signals of, for example, the oldest recording order, the newest recording order, and a specific recording date and time are automatically reproduced from the information of the recording date and time on the predetermined area of the medium.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the audio signal reproducing apparatus according to the present invention is applied to an audio data compression / expansion type magneto-optical disk recording / reproducing apparatus will be described below with reference to the drawings.

The configuration of the disk recording / reproducing apparatus of this example is shown in FIG. In FIG. 3, reference numeral 1 is an optical disc. The outer diameter of the disk 1 of this example is 64 mm, and recording tracks are formed in a spiral shape on the disk 1 at a pitch of 1.6 μm, for example. The disc 1 is rotated at a constant linear velocity, for example 1.2 to 1.4 m / s. Then, by recording the audio information as a digital signal and compressing and recording it on the disc 1, 130 M bytes or more of the target information can be recorded and reproduced.

In this example, the disk 1 has 2
Different types of discs can be considered. For example, a read-only type optical disc in which a signal is recorded by a pit string formed by an injection mold or the like, and a rewritable magneto-optical disc having a magneto-optical recording film capable of recording / reproducing and erasing are considered.

Further, a pregroove for controlling a light spot (for tracking control) is preliminarily formed on the disc 1, and in particular, in the case of this example, a wobbling signal for tracking is added to this pregroove. The absolute address code is recorded in a superimposed manner. The disc 1 is housed in a disc cartridge 2 to prevent dust and scratches.

Further, like the compact disc described above, in the audio data compression / expansion type optical disc 1, information about the audio data recorded at the innermost track position is the so-called TOC (Table of content).
Is recorded as. In this TOC, in addition to the number of songs recorded on the disc 1, the song number (track number) of each song, the playing time, the recording position information, and the like,
The time axis information includes the date and time when each song was recorded.

Further, in the rewritable magneto-optical disk, when recording / erasing is repeated, the recording position of a series of audio data may become discontinuous. In this case,
Link information for associating the recording date and time with the recording position is added to the TOC.

[Recording System of Recording / Reproducing Device] The recording / reproducing device of FIG. 3 is devised so that the structure can be simplified as much as possible by using an IC. First, the time of recording on a magneto-optical disk will be described. During recording and reproduction, the mode switching signal R / P from the system control circuit 20 causes
The mode of each circuit unit is switched.

The system control circuit 20 includes a recording key K.
r, playback key Kp, stop key Ks, marker key Km ...
A key operation unit 41 including a plurality of operation keys is connected, and an operation mode is designated by operating these keys.

Further, in this embodiment, the TOC memory 20m is connected to the system control circuit 20 and the TOC data including the recording date and time regarding the recording data, the recording position information, and the required time of the music are temporarily stored. . The memory 20m may be set in the RAM in the microcomputer or may be set in the buffer memory 25 described later. The TOC data temporarily stored in the memory 20m is the Tc of the innermost circumference of the disc after the recording is completed.
It is recorded in the OC recording area.

2 through a pair of input terminals 21LT and 21RT
The analog audio signal of the channel is sampled by the A / D converter 22 at a sampling frequency of 44.1 kHz, and each sampling value is converted into a 16-bit digital signal. This 16-bit digital signal is supplied to the data compression circuit 23R, and in the case of this example, the input digital data is compressed to, for example, 1/5. Various methods can be used as this data compression method. For example, an ADPCM (Adap
tive Delta Pulse Code Modulation) is used.

Further, for example, the input digital data is divided into a plurality of bands so that the higher the band is, the wider the band is, and a plurality of samples (the number of samples is the same in each band) for each divided band. It is also possible to use a method in which a block of (good) is formed, orthogonal transformation is performed for each block in each band, coefficient data is obtained, and bits are assigned to each block based on this coefficient data. The data compression method in this case considers the human auditory perception characteristics to sound, and can perform data compression with high efficiency (see Japanese Patent Application No. 1-278207).

In this way, the digital data DA from the A / D converter 22 is divided into 1 / by the processing in the compression circuit 23R.
Data compressed to 5, and this data compressed data da
Are transferred to the buffer memory 25 controlled by the memory control circuit 24. In the case of this example, the buffer memory 25 is a D-RAM having a capacity of 1 Mbit.

The memory control circuit 24 transfers the compressed data da from the buffer memory 25 at a transfer speed which is about 5 times as fast as the write speed unless a track jump in which the recording position on the disk 1 jumps due to vibration or the like during recording occurs. The data is sequentially read and the read data is read by the data encoding circuit 26.
Transfer to R.

When it is detected that a track jump has occurred during recording, the data transfer to the encoding circuit 26R is stopped and the compressed data da from the processing circuit 23R is stopped.
Is stored in the buffer memory 25. Then, when the recording position is corrected, control is performed to restart the data transfer from the buffer memory 25 to the encoding circuit 26R.

Whether or not a track jump has occurred can be detected by, for example, providing a vibrometer in the apparatus and detecting whether or not the magnitude of vibration is such that a track jump occurs. Further, as described above, the absolute address code is recorded on the disc 1 of this example so as to be superposed on the wobbling signal for tracking control when forming the pre-groove. Therefore, it is possible to read the absolute address code from the pregroove at the time of recording and detect the track jump from the decoded output. Alternatively, the OR of the vibrometer and the absolute address code may be taken to detect the track jump.
When a track jump occurs, the power of the laser light for magneto-optical recording is lowered or the power is set to zero.

The correction of the recording position when the track jump occurs can be performed by using the absolute address code. Further, as will be understood from the above, as the data capacity of the buffer memory 25 in this case, the compressed data da corresponding to the time from the occurrence of the track jump to the correct correction of the recording position can be accumulated. Minimum capacity required. In this example, the buffer memory 25 has a capacity of 1 Mbit as described above, and this capacity is selected with a margin so as to sufficiently satisfy the above conditions.

Further, in this case, the memory control circuit 24 is
During this recording, during normal operation, memory control is performed so that the amount of data stored in the buffer memory 25 is reduced as much as possible. For example, when the amount of data in the buffer memory 25 exceeds a predetermined amount, a predetermined amount of data, for example 32 sectors (1 sector is 1 CD-ROM
Only the data of the sector (about 2 Kbytes) is read from the buffer memory 25, and the memory control is performed so as to always secure the write space of a predetermined data amount or more.

The data encoding circuit 26R stores the compressed data da transferred from the buffer memory 25 in CD-.
Encodes into sector data of ROM. In addition,
Data including audio data for 32 sectors is hereinafter referred to as a cluster.

The output data (data in cluster units) of the data encoding circuit 26R is supplied to the recording encoding circuit 27. In this recording encoding circuit 27,
Encode data for error detection and correction,
Modulation processing suitable for recording, such as EFM coding processing in this example, is performed. The code for error detection and correction is a CD in this example.
The CIRC (Cross Interleaved Reed Solomon Code) of which interleave is changed is used. Since the recorded data is intermittent data in cluster units, a plurality of linking sectors for cluster connection are added before and after the cluster data of 32 sectors.

The encoded data from the recording encoding circuit 27 is supplied to the magnetic head 29 via the magnetic head driving circuit 28. The magnetic head drive circuit 28 drives the magnetic head 29 so as to apply a modulation magnetic field according to the recording data to the disk 1 (magneto-optical disk). The recording data supplied to the head 29 is in cluster units, and recording is performed intermittently.

The disk 1 is housed in the cartridge 2, but when it is loaded into the apparatus, the shutter plate is opened and the disk 1 is exposed from the shutter opening. The disk drive motor 30 is inserted in the spindle insertion opening.
The rotation shaft of M is inserted and connected, and the disk 1 is rotationally driven. In this case, the disk drive motor 30M is controlled by the servo control circuit 32, which will be described later, to have a linear velocity of 1.2 to 1.4 m.
The rotation speed is controlled so that the disk 1 is rotationally driven at / s.

The magnetic head 29 faces the disk 1 exposed from the shutter opening of the cartridge 2.
An optical head 30 is provided at a position facing the surface of the disk 1 opposite to the surface facing the magnetic head. The optical head 30 is composed of, for example, a laser light source such as a laser diode, a collimator lens, an objective lens, a polarization beam splitter, an optical component such as a cylindrical lens, and a photodetector. , Laser light with a constant power larger than that during reproduction is emitted. Data is recorded on the disk 1 by thermomagnetic recording by this light irradiation and the modulation magnetic field by the magnetic head 29. The magnetic head 29 and the optical head 30 are both configured to be movable in the radial direction of the disk 1.

During this recording, the optical head 3
The output of 0 is supplied to the absolute address decoding circuit 34 via the RF signal processing circuit 31, and the absolute address code from the pre-groove of the disc 1 is extracted and decoded. Then, the decoded absolute address information is supplied to the recording encoder circuit 27, inserted as absolute address information in the recording data, and recorded on the disc. The absolute address information from the absolute address decoding circuit 34 is
It is supplied to the system control circuit 20 and is used for recognition of the recording position and position control as described above.

Further, a signal from the RF signal processing circuit 31 is supplied to the servo control circuit 32, a control signal for the constant linear velocity servo of the motor 30M is formed from the signal from the pre-groove of the disk 1, and the motor 30M is driven. Speed controlled.

[Reproduction system of recording / reproducing apparatus] The apparatus of this example is capable of reproducing two kinds of disks, a read-only type optical disk and a rewritable type magneto-optical disk, and discriminating between the two kinds of disks. Can be performed, for example, by detecting the identification recessed hole provided in each disk cartridge 2 when the disk cartridge 2 is loaded in the apparatus. Further, since the light reflectance is different between the read-only type disc and the rewritable type disc, it is possible to discriminate between the two types of discs based on the amount of received light. Although not shown, the discriminating outputs of these two types of discs are supplied to the system control circuit 20.

The disk loaded in the apparatus is rotationally driven by the disk drive motor 30M. Then, in the same manner as during recording, the disk drive motor 30M is driven by the servo control circuit 32 by the signal from the pre-groove so that the disk 1 has the same speed as during recording, that is, the linear velocity of 1.2 to 1.4 m / s. Then, the rotation speed is controlled to be constant.

During reproduction, the optical head 30 detects the focus error by the astigmatism method by detecting the reflected light of the laser beam applied to the target track, and also detects the tracking error by the push-pull method, for example. In addition, in the case of a read-only type optical disc, the reproduction signal is detected by utilizing the diffraction phenomenon of light in the pit row of the target track, and in the case of a rewritable magneto-optical disc, the reflected light from the target track is detected. A difference in polarization angle (Kerr rotation angle) is detected and a reproduction RF signal is output.

The output of the optical head 30 is supplied to the RF signal processing circuit 31. The RF signal processing circuit 31 extracts the focus error signal and the tracking error signal from the output of the optical head 30 and supplies them to the servo control circuit 32, and also binarizes the reproduction signal and supplies it to the reproduction decoding circuit 33.

The servo control circuit 32 controls the focus of the optical system of the optical head 30 so that the focus error signal becomes zero, and also controls the optical system of the optical head 30 so that the tracking error signal becomes zero. Performs tracking control.

The RF signal processing circuit 31 also extracts the absolute address code from the pre-probe and supplies it to the absolute address decoding circuit 34. Then, in the system control circuit 20,
The absolute address information from the decoding circuit 34 is supplied,
The servo control circuit 32 is used to control the reproduction position of the optical head 30 in the radial direction of the disk. The system control circuit 20 can also use the address information in sector units extracted from the reproduced data to manage the position on the recording track scanned by the optical head 30.

During this reproduction, as will be described later, the disc 1
The compressed data read from is written in the buffer memory 25, read and expanded, but due to the difference in the transmission rate of both data, the data read by the optical head 30 from the disk 1 is stored in, for example, the buffer memory. The data is intermittently performed so that the data does not fall below a predetermined amount.

The data read from the disk 1 is R
It is supplied to the reproduction decoding circuit 33 via the F signal processing circuit 31. The reproduction decoding circuit 33 receives the binarized reproduction signal from the RF signal processing circuit 31, and performs a process corresponding to the recording encoding circuit 27, that is, an EFM decoding process.
Decoding processing and interpolation processing for error detection and correction are performed. The output data of the reproduction decoding circuit 33 is supplied to the data decoding circuit 26P.

This data decoding circuit 26P is a CD-
Data of the sector structure of the ROM is decoded into original data in a compressed state.

The output data of the data decoding circuit 26P is transferred to the buffer memory 25 controlled by the track jump memory control circuit 24 and written at a predetermined writing speed.

At the time of this reproduction, the memory control circuit 24 writes the compressed data from the data decoding circuit 26P unless a track jump in which the reproduction position jumps due to vibration or the like occurs during reproduction. The data is sequentially read at a transfer rate of about ⅕ times the speed, and the read data is transferred to the data expansion processing circuit 23P. In this case, the memory control circuit 24 controls writing / reading of the buffer memory 25 so that the amount of data stored in the buffer memory 25 does not fall below a predetermined value.

When it is detected that a track jump has occurred during reproduction, writing of data from the data decoding circuit 26P to the buffer memory 25 is stopped and only data transfer to the data expansion processing circuit 23P is performed. .
Then, when the reproduction position is corrected, control is performed to restart the data writing from the data decoding circuit 26P to the buffer memory 25.

Whether or not a track jump has occurred is detected by the method using a vibrometer and the absolute address code recorded by being superposed on the wobbling signal for tracking control in the pre-groove of the optical disk, as in the case of recording. The method used (that is, the method using the decode output of the absolute address decoding circuit 34) or the method for detecting the track jump by taking the OR of the vibrometer and the absolute address code can be used. Further, since the absolute address information and the sector unit address information are extracted from the reproduction data during the reproduction as described above, this can be used.

As will be understood from the above, as the data capacity of the buffer memory 25 at the time of this reproduction, as is understood from the above, the data corresponding to the time from the occurrence of the track jump to the correct correction of the reproduction position is set. The minimum storage capacity is always required. This is because if there is such a capacity, even if a track jump occurs, the buffer memory 25
This is because the data can be continuously transferred from the data decompression circuit 23P to the data decompression circuit 23P. The 1M bit as the capacity of the buffer memory 25 in this example is selected as a capacity having a margin so as to sufficiently satisfy the above condition.

Further, as described above, the memory control circuit 24 is as much as possible in the buffer memory 25 during normal operation.
In addition, memory control is performed so that predetermined data above the required minimum is stored. In this case, for example, when the data amount of the buffer memory 25 becomes equal to or less than a predetermined amount, the optical head 30 intermittently takes in the data from the disk 1 and writes the data from the data decoding circuit 26P. The memory control is performed so as to always secure a read space of a predetermined data amount or more.

In the data expansion processing circuit 23P, the ADPC
In contrast to the data compression processing at the time of recording, the M data is expanded about 5 times.

The digital audio data from the data decompression circuit 23P is supplied to the DA converter 35, which outputs 2
The analog audio signal of the channel is restored and output from the pair of output terminals 36LT and 36RT.

[Time-Axis Reproduction Operation of Reproduction System] Next, the time-axis reproduction of the embodiment of the present invention will be described. In this example, by operating the reproduction mode setting key, one of normal reproduction (N), program reproduction (P), shuffle reproduction (SH), or time axis reproduction (T) is set. When the set reproduction mode is time axis reproduction, further, descending order reproduction (DN) in which the recording date and time is first reproduced, and ascending order reproduction (UP) in which the recording date and time are newest are selected. Time axis reproduction conditions such as selective reproduction (SE) that reproduces the selected date and time or the selected time range, and the range of the recording date and time to be selected,
It is specified by key operation.

1 and 2 are flowcharts showing the operation of the system control circuit 20 of the disc recording / reproducing apparatus of this example.

That is, first, in step 101, it is determined whether or not a key has been operated. If the operated key is the reproduction mode setting key, the process proceeds from step 101 to step 102 and the other keys. Occasionally, the routine proceeds in response to the key operation.

At step 102, it is judged which reproduction mode is designated. As a result of the determination, when it is determined that any of normal, program, and shuffle modes other than the time axis playback mode is set,
Each of the set reproduction modes of normal, program and shuffle is entered (steps 103, 104, 10).
5) Returning to step 101, the mode state is held until the next key input.

If it is determined in step 102 that the set mode is time axis reproduction, the process proceeds from step 102 to step 106 to enter the time axis reproduction mode. Then, the process proceeds to step 107, the data in the TOC area of the disc 1 is read, and the information on the recording date and time of each song is taken out.

At the next step 108, a key input of the condition of time axis reproduction is accepted, and this state is continued until it is judged at step 109 that time axis reproduction is started by a key operation. Although not shown, if the cancel operation of the time axis reproduction mode is performed in the key input acceptance step of step 108, the process returns to step 101 and exits from the time axis reproduction mode.

When it is determined in step 109 that the time axis reproduction is started, the process proceeds to step 110 and step 108.
The time axis reproduction to be executed is determined based on the time axis reproduction condition set in. As a result of the determination in step 110, if the reproduction is in descending order, the process proceeds to step 111 and step 1
From the information on the recording date and time of the TOC read in 07, reproduction is performed in order from the newest recording date and time, and in the case of ascending reproduction, the process proceeds to step 112, and reproduction is performed in order from the oldest recording date and time.

In the case of selective reproduction, step 11
Proceed to step 3, and refer to the TOC recording date / time information to search for and play back a specified date / time (only time can be specified) or a specified range of recording date / time (only time can be specified). To be done.

As a result, for example, it is possible to easily record and reproduce a program at a specific broadcast date and time, such as the news at 9:00 yesterday, or a scheduled program such as news, weather forecast, and English conversation, and fine search conditions. You can easily select and play with.

When the reproduction mode described above is entered, step 10
It returns to 1 and returns to the state of waiting for the next key input. When the reproduction in each reproduction mode is completed, step 10 of each reproduction is performed.
At 3, 104, 105, 111, 112, and 113, this is detected, the reproduction is ended, and by the next key input in step 101, the operation corresponding to the key operation is performed.

In the time axis reproduction as described above,
When there are a plurality of target discs, by using the autochanger, it is possible to easily perform time axis reproduction over a plurality of discs while satisfying reproduction conditions such as descending order, ascending order, and selection. In this case, it is possible to perform time-axis reproduction, for example, extracting only songs of the 1960s from a plurality of discs and reproducing them.

From the same idea as the time axis reproduction, for example, when the magneto-optical disk is recorded up to the full capacity and there is no recordable area, the recording date and time is old, as in the ascending order reproduction. It is possible to secure a required recordable area by sequentially erasing. In this case, the songs to be deleted can be designated by displaying each song (track number), title, required time, etc. on the display in the order of recording date and time. Also, specify the recording date and time,
You can also specify the song to erase.

In the above example, the present invention is applied to the audio data compression / expansion type optical disc reproducing apparatus. However, if the recording date and time is recorded as information on the recording medium as in the case of the TOC. Similarly, the present invention can be applied.

[0063]

As described above, according to the present invention, there is provided an audio signal reproducing apparatus which uses a medium in which information of recording dates and times of a plurality of audio data is recorded in the TOC area. Since the reproduction is performed in descending or ascending order or selectively according to the information of the recording date and time, it is possible to easily reproduce the plurality of audio data in time series.

[Brief description of drawings]

FIG. 1 is a diagram showing a part of a flowchart for explaining an operation of an embodiment of an audio signal reproducing apparatus according to the present invention.

FIG. 2 is a view showing a continuation of the flowchart of the example of FIG.

FIG. 3 is a block diagram showing the configuration of an embodiment of the present invention.

[Explanation of symbols]

1 disk 20m TOC memory 20 system control circuit (microcomputer)

Claims (4)

[Claims] 1. An audio signal reproducing apparatus using a medium in which information of recording date and time of audio data is recorded in respective predetermined areas, wherein the audio signal is reproduced in accordance with the information of recording date and time. Playback device. 2. The plurality of audio data are reproduced in order from the newest recording date and time.
An audio signal reproducing apparatus according to. 3. The audio signal reproducing apparatus according to claim 1, wherein the plurality of audio data are reproduced in order from the oldest recording date and time. 4. The audio signal reproducing apparatus according to claim 1, wherein the audio data having a designated recording date and time is reproduced from among the plurality of audio data.