JPH0535490Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Field of industrial application] This invention relates to an optical disc playback device, and particularly
The present invention relates to an optical disc playback device capable of playing back both CAV discs and CLV discs.

[Conventional technology]

In optical disc playback devices, the angular velocity is usually
CAV disc constant at 1800 rpm (standard disc)
It is now possible to play both CLV discs (long-duration discs) with a constant linear velocity of 11 m/s.

A CAV disk stores one frame (one screen) per track from the innermost circumference to the outermost circumference.

On the other hand, with a CLV disk, one frame is stored in one track on the innermost periphery, and three frames are stored on one track on the outermost periphery.
The playback time is twice that of a CAV disc.

Both CAV discs and CLV discs have subcodes recorded in the digital signal, and by reading the subcode information, you can display the screen page and elapsed playback time, or search by specifying the screen page or time. It is now possible to do so.

[The problem that the idea aims to solve]

However, the subcode of the CAV disk does not include a time number, and even if the subcode is read, there is no time number data, so
Even if the subcode information was displayed, it was not possible to know the elapsed playback time, and it was also impossible to perform a time search by specifying a time number.

Conversely, the subcode of a CLV disk does not include a frame number, and even if the subcode is read, there is no frame number data, so it is not possible to know the page on the screen from the display of the subcode information, and the frame number is not included. I couldn't even search for a frame by specifying a number.

Therefore, regardless of the type of disc, users cannot uniformly respond to either the frame number (page on the screen) or the time number (elapsed playback time); It was a hassle to have to change the way I responded.

This idea was developed in view of the bearing technology problems mentioned above.
It is an object of the present invention to provide an optical disc playback device that can use both frame numbers and time numbers regardless of the type of disc.

More specifically, it is an object of the present invention to provide an optical disc playback device that can obtain either frame number or time number data related to the current position of the disc, regardless of the type of disc.

Another object of the present invention is to provide an optical disc playback device that can perform both frame search and time search, depending on the user's preference, regardless of the type of disc.

[Means to solve the problem]

The optical disc playback device of this invention is capable of playing back both CAV discs and CLV discs, and has a subcode reading means for reading a subcode including a frame number or time number from a digital signal detected from the disc. , conversion means for converting the frame number of the subcode read by the subcode reading means into a corresponding time number, and converting the time number read by the subcode reading means into the corresponding frame number. It is said that

In addition, other optical disc playback devices of this invention include:
A subcode reading means that can play both CAV and CLV discs, reads a subcode including a frame number or time number from a digital signal detected from the disc, and a disc identification device that identifies whether the disc is CAV or CLV from the subcode. an optical disc reproducing apparatus, comprising: a search number input means for inputting a designated frame number or a designated time number for searching; and a search control means for performing search control according to the designated frame number or designated time number; and a determination means for determining whether or not the identification contents of the search number input means match the input contents of the search number input means, and when the determination means determines that they do not match, the designated frame number inputted by the search number input means is changed to the corresponding designated time number. and conversion means for converting the designated time number inputted by the search number input means into a corresponding designated frame number, and the search control means converts the designated time number inputted by the search number input means into a designated frame number when the identification content of the disk identification means indicates CAV. The system is characterized in that search control is performed with the specified time number as the destination, and when CLV is indicated, the search control is performed with the designated time number as the destination.

〔Example〕

Next, one embodiment of this invention will be described with reference to FIG.

Figure 1 shows the CAV disk according to this invention.
FIG. 2 is a block diagram of an optical disc playback device that can be used with both CLV discs.

The disk 10 is rotated by the spindle motor 12 at a constant angular velocity of 1800 rpm in CAV, and at a constant linear velocity at a variable angular velocity of 600 to 1800 rpm in CLV.

Signals recorded on the disk 10 are detected by an optical pickup 14 and output as RF signals.

The optical pickup 14 also outputs a focusing error signal F _e and a tracking error signal T _e .

The optical pickup 14 is fed by a slider motor 16 in the radial direction of the disk.

On the RF signal output side of the optical pickup 14,
three bandpass filters 18, 20, 22,
One low pass filter 24 is connected in parallel.

The bandpass filter 18 is for extracting a video FM modulation signal with a center frequency of 8.5MHz from the RF signal, and this video FM modulation signal is sent to the FM demodulator 26 connected to the output side of the bandpass filter 18.
FM demodulation is performed to form a video signal.

The bandpass filter 20 is for extracting the 2nd CH audio FM modulation signal with a center frequency of 2.8 MHz from the RF signal, and this audio FM modulation signal is sent to the FM demodulator 28 connected to the output side of the bandpass filter 20. FM modulation is performed to form the second CH audio signal.

The bandpass filter 22 is for extracting the first CH audio FM modulated signal with a center frequency of 2.3 MHz from the RF signal, and this audio FM modulated signal is sent to the FM demodulator 30 connected to the output side of the bandpass filter 22. FM demodulation is performed to form the first CH audio signal.

The low-pass filter 24 is for extracting an EFM modulated signal having a frequency of 1.75 MHz or less from the RF signal.

A waveform shaping circuit 32 is connected to the output side of the low-pass filter 24, and the EFM modulation signal is converted into a square wave.

A digital signal processing circuit 34 is connected to the output side of the waveform shaping circuit 32.
Performs signal processing such as EFM demodulation, deinterleaving, correction, and interpolation on EFM modulated signals.
Two channels of audio sample data and subcodes are read.

The digital signal processing circuit 34 has the function of reading audio sample data and subcodes.

A D/A converter 36 is connected to the audio sample data output side of the digital signal processing circuit 34, and the audio sample data for 2 channels is converted into analog audio signals for 2 channels, L and R.

spindle motor 12, slider motor 16,
A focusing coil (not shown) and a tracking coil (not shown) of the optical pickup 14 are
Predetermined servo control is performed by the servo section 38.

Specifically, the video signal output from the FM demodulator 26 is input to the spindle servo circuit, and the spindle motor 16 is driven so that the horizontal synchronization signal in the video signal matches the frequency of the reference signal.

Further, the focusing error signal F _e from the optical pickup 14 is input to the focus servo circuit, and the focusing coil is driven so that the beam of the optical pickup 14 is focused on the pit of the disk 10. .

Further, the tracking error signal T _e from the optical pickup 14 is input to the tracking servo circuit, and the tracking coil and slider motor 16 are driven so that the focus of the beam from the optical pickup 14 follows the track of the disk 10. It will be done.

The servo unit 38 receives external PLAY start control and search control at the time of PLAY start and search, and controls the spindle motor 12 and the slider motor 1.
6. The optical pickup 14 is configured to perform a predetermined PLAY start operation and search operation.

A system microcomputer (hereinafter simply referred to as "system microcomputer") 40 is connected to the subcode output side of the digital signal processing circuit 34 and the external control input side of the servo unit 38.

The input side of this system microcomputer 40 has an operation section 42, and the output side has a frame/time display section 44.
is connected, and furthermore, the system microcontroller 40
A mechanism section 46 is interconnected to the two.

As shown in FIG.
Numerical keys 60 to 78 such as 8, 1 to 9, and 0 are provided, and key signals corresponding to key operations by the user are output to the system microcomputer 40.

The frame/time switching key 56 is used by the user to switch between frame number mode and time number mode.
A numeric keypad consisting of numerical keys 60 to 78 together with the frame/time switching key 56 forms search number designation means.

The frame/time display section 44 is for displaying screen pages (frame numbers) or elapsed playback time (time numbers) under display control by the system microcomputer 40.

The mechanism section 46 has a function of loading or unloading the disk 10 based on mechanical control of the system microcomputer 40 and outputting an insertion detection signal to the system microcomputer 40 when the disk 10 is inserted by the user. ing.

The system microcomputer 40 includes a CPU, ROM,
RAM is connected to a bus, and according to a predetermined program stored in ROM, loading/unloading control according to user operations, PLAY
Executes various processes such as start control, PLAY stop control, search control, and display control of screen pages and elapsed playback time.

The system microcomputer 40 also executes disk identification processing based on subcodes and data conversion processing between frame numbers and time numbers.

As shown in FIG. 3, the RAM of the system microcomputer 40 includes an area for storing the frame number and time number of the subcode read from the disk 10, a numeric keypad buffer for storing data input using the numeric keypad, and numeric keypad buffer data. A conversion data area for storing conversion data converted into a frame number or time number, and areas for A flag and B flag are provided.

In the conversion data area, when the data of the numeric keypad buffer is the specified frame number, the specified time number obtained from the specified frame number by the specified data conversion is stored, and when the data of the numeric keypad buffer is the specified time number, the specified time number is stored. The designated frame number obtained from the designated time number through predetermined data conversion is stored.

The A flag indicates the type of disk 10, and when it is 0, it is CAV, and when it is 1, it is CLV.

The B flag indicates the mode specified by the user; when it is 0, it is frame number mode, and when it is 1, it is time number mode.

Next, the operation of this embodiment will be explained with reference to the flowcharts of FIGS. 4 and 5.

It is assumed that the B flag of the RAM is set to 0 and the numeric keypad buffer area is cleared in advance.

When the user inserts the CAV disk 10 into the disk insertion slot, the mechanism section 46 outputs a disk insertion detection signal to the system microcomputer 40.

When the system microcomputer 40 receives the disk insertion detection signal, it determines that a disk has been inserted (step 70 in FIG. 4), controls the mechanism section 46 to load the disk 10, and connects it to the spindle motor 12. (step 72).

Here, the user presses the PLAY key 50 on the operation unit 42.
When turned on, a predetermined key signal related to the PLAY key 50 is output from the operation section 42 to the system microcomputer 40.

When the system microcomputer 40 inputs a key signal related to the PLAY key 50 in the stopped state, the system microcomputer 40 starts the step
74 and 76 are determined as YES, and the servo section 38 is given a predetermined PLAY start control to start the rotation of the disk 10, and the optical pickup 14 is made to start detecting the disk recording signal (step
78).

The RF signal detected by the optical pickup 14 is
The bandpass filter 18 extracts the video FM modulated signal, and the FM demodulator 26 demodulates the video signal.

Furthermore, the RF signal is passed through bandpass filters 20 and 22 to the 2nd CH audio FM modulated signal and the 1st CH audio signal.
The FM modulated signals are extracted and each FM demodulator 28
The audio signals of the first CH and the second CH are demodulated in steps 30 and 30.

Furthermore, the RF signal is subjected to EFM through a low-pass filter 24.
After the modulated signal is extracted and waveform-shaped by the waveform shaping circuit 32, it is processed by the digital signal processing circuit 34.
2CH worth of audio sample data and subcode are read.

The audio sample data is converted by the D/A converter 36 into analog audio signals for 2 channels of L and R.

Further, the subcode is output to the system microcomputer 40.

The video signal output from the FM demodulator 26 and the audio signal output from the D/A converter 36 are output to, for example, an AV television (not shown), and the video screen and audio are reproduced.

During PLAY, the angular velocity of the disk 10 is always kept constant by the servo control of the servo unit 38, the beam of the optical pickup 14 is focused on the pit of the disk 10, and tracking is performed on the pit row. Ru.

After the processing in step 78, the system microcomputer 40 inputs the subcode from the digital signal processing circuit 34 (step 80), checks the code indicating the disk type, determines whether it is CLV, and identifies the disk type. (Step 82).

In this case, since the disk 10 is CAV, the system microcomputer 40 determines NO at step 82.
The A flag in RAM is cleared to 0 (step 84).

Then, the system microcomputer 40 inputs the subcode from the digital signal processing circuit 34 again, and transfers the frame number included in the subcode to the RAM.
frame number area (step
86).

Next, by referring to the B flag, it was confirmed that the frame number mode was specified as the current mode (step 88), and further, by referring to the A flag, it was confirmed that the type of disk 10 was CAV. After that (step 90), a frame display control signal corresponding to the frame number stored in the RAM is output to the frame/time display section 44, and page information on the screen is displayed (step 92).

Next, the system microcomputer 40 checks the input from the operation unit 42 and determines whether or not the user has performed a key operation (steps in FIG. 5).
94) If no key operation has been performed by the user, the process returns to step 86 in FIG. 4 and the subcode is input from the digital signal processing circuit 34.
Frame number included in the subcode
Store in frame number area of RAM.

Next, check the B flag to confirm that the current mode is the frame number mode (step 88), and refer to the A flag to confirm that the type of disk 10 is CAV (step 90). , outputs a frame display control signal corresponding to the frame number stored in the RAM to the frame/time display unit 44, and displays page information on the screen (step 92).

Similarly, when the frame number mode is specified and the disk 10 is CAV, page information on the screen is displayed based on the frame number in the subcode read from the disk 10.

This allows the user to use CAV disk 10.
You can know frame information during PLAY.

However, the display of frame information, for example,
It is displayed as the characters <FRAME> followed by a 5-digit number.

Here, if the user wants to know the playback elapsed time, he/she may turn on the frame/time switching key 56 of the operation section 42 and designate the time number mode.

When the frame/time switching key 56 is turned on, a key signal related to the frame/time switching key 56 is transmitted from the operation unit 42 to the system microcomputer 40.
Output to.

The system microcomputer 40 controls the operation unit 4 during PLAY.
When the key signal related to the frame/time switching key 56 is inputted from step 2, steps 94 and 96 in FIG.
YES is determined, and the B flag is inverted to 1, indicating that the time number mode is designated (step 98).

Then, after that, the system microcomputer 40
After inputting the subcode and storing the frame number in the RAM at step 86 in the figure, the B flag is checked (step 88), and since the B flag is 1, it is determined that the mode is time number mode.

At this time, the system microcomputer 40 performs the steps
Proceed to 102 and A flag is 0 and disk 10 is
After confirming that it is a CAV, the frame number stored in the RAM is divided by 30 to obtain a time number in minutes, which is stored in the time number area of the RAM (step 104).

Then, a time display control signal corresponding to the time number stored in the RAM is output to the frame/time display section 44, and the elapsed playback time is displayed in minutes (step 106).

Next, the system microcomputer 40 checks the input from the operation unit 42 and determines whether or not the user has performed a key operation (steps in FIG. 5).
94) If no key operation has been performed by the user, the process returns to step 86 in FIG. 4 and the subcode is input from the digital signal processing circuit 34.
Frame number included in the subcode
Store in frame number area of RAM.

Next, check the B flag to confirm that the current mode is time mode (step
88), the type of disk 10 is determined by referring to the A flag.
After confirming that it is a CAV (step 102),
A time number corresponding to the frame number stored in the RAM is obtained, and a time display control signal corresponding to this time number is sent to the frame/time display section 44.
and display elapsed playback time information (step 106).

In the same way, the time number mode is specified, and when the disk 10 is CAV, the frame number in the subcode read from the disk 10 is converted into the corresponding time number, and the data is converted based on this time number. Displays the elapsed playback time.

This allows the user to use CAV disk 10.
You can know time information while playing.

Here, the reproduction elapsed time is displayed, for example, by a numerical value in minutes followed by the character <minute>.

After that, if the user wants to search by specifying a time, for example, if the destination is 25 minutes, first,
Numerical keys 62 and 68 of the numeric keypad of the operation unit 42
After turning on the search key 54 once in this order, turn on the search key 54 once.

When the numeric key 62 is turned on, a key signal related to the numeric key 62 is sent from the operation unit 42 to the system microcomputer 4.
Output to 0.

The system microcomputer 40 controls the operation unit 4 during PLAY.
When a key signal related to the numeric key 62 is input from 2, YES is determined at steps 94 and 106 in FIG. 5, and then the numeric value 2 is stored in the numeric keypad buffer area of the RAM by left shifting (step 108).

Subsequently, when the numerical key 68 is turned on, the operation section 4
2, a key signal related to the numerical key 62 is output to the system microcomputer 40.

The system microcomputer 40 controls the operation unit 4 during PLAY.
When a key signal related to numeric key 62 is input from 2, after determining YES in steps 94 and 106,
The number 5 is stored in the numeric keypad buffer area of the RAM by shifting to the left (step 108).

As a result, the number 25 is stored in the RAM numeric keypad buffer as the designated time number.

Next, when the search key 54 is turned on, a key signal related to the search key 54 is output from the operation unit 42 to the system microcomputer 40.

The system microcomputer 40 controls the operation unit 4 during PLAY.
When the key signal related to the search key 54 is inputted from 2, it is judged as YES in steps 94 and 110, it is confirmed that the A flag is 0 and the disk 10 is CAV (step 112), and furthermore, the B flag is 1. After confirming that it is in the time mode (step 114), the specified time number stored in the numeric keypad buffer of the RAM is multiplied by 30, converted to the specified frame number, and stored in the conversion data area (step 116). ).

Then, a predetermined frame search control is performed on the servo unit 38 using the data stored in the conversion data area as a designated frame number (118), and the frame number in the subcode read by the digital signal processing circuit 34 is converted data. When the optical pickup 14 moves to a position that matches the designated frame number stored in the area (YES in step 120), the system microcomputer 4
After clearing the numeric keypad buffer, 0 performs a predetermined PLAY start control on the servo unit 38 (steps 122 and 124), causing playback to start from the position corresponding to the time number specified by the user.

This allows the user to search the CAV disk 10 by specifying a time number.

After the search is completed, the system microcomputer 40 converts the frame number of the subcode read from the disk 10 into a time number, and controls the display of the elapsed playback time based on this time number.

On the other hand, if the user wishes to search by specifying a frame, he or she first turns on the frame/time switching key 56 to specify a frame number mode.

The system microcomputer 40 performs steps 94 and 96 in FIG.
After determining YES, invert the B flag and set it to 0.
Indicates that the frame number mode is specified (step 98).

Next, for example, when the destination is 1320 frames, the user turns on the numeric keys 60, 64, 62, and 78 of the numeric keys of the operation unit 42 once in that order, and then turns on the search key 54 once. .

When each numeric key is turned on, the system microcomputer 40 sequentially stores the corresponding numeric data into the numeric keypad buffer by shifting to the left.

Therefore, the numerical value 1320 is finally stored in the numeric keypad buffer of the RAM as the designated frame number.

Next, when the search key 54 is turned on, the system microcomputer 40 confirms that the A flag is 0 and the disk 10 is CAV, and further confirms that the B flag is 0 and is in frame number mode. After that (steps 110 to 114), the process moves to step 118, where a predetermined frame search control is performed on the servo section 38 using the data stored in the numeric keypad buffer as a specified frame number, and the sub-frame search read by the digital signal processing circuit 34 is performed. When the optical pickup 14 moves to the position where the frame number in the code matches the designated frame number stored in the numeric keypad buffer (step 120
After clearing the numeric keypad buffer, a predetermined PLAY start control is performed on the servo section 38 (step 122), and playback is performed from the position corresponding to the frame number specified by the user.

This allows the user to search the CAV disc 10 by specifying a frame number.

After the search is completed, the system microcomputer 40 controls the display of page information on the screen based on the frame number of the subcode read from the disk 10 in the same manner as described above.

After that, when the user wants to replace the disk 10 with another one, first press the STOP key 5 on the operation unit 42.
2 and then turn on the eject key 58.

Then, in accordance with the key signal related to the STOP key 52 input from the operation unit 42, the system microcomputer 40 determines YES in steps 94 and 126 in FIG. stop the rotation (step
128).

Subsequently, the system microcomputer 4
0 is determined as YES in steps 74 and 130 in Figure 4,
The mechanism section 46 is controlled to unload the disk 10 (step 132).

Disk 10 unloaded by user
After removing the disk, when another CLV disk 10 is inserted, the system microcomputer 40 is energized by the disk insertion detection signal inputted from the mechanism section 46 and controls the mechanism section 46 to load the disk 10. Set on the table connected to the spindle motor 10 (step 70,
72).

Next, when the user turns on the PLAY key 50, the system microcomputer 40 performs predetermined PLAY start control (step 78), and the digital signal processing circuit 34
A subcode is input from (step 80), and a code indicating the disk type is checked to determine whether it is CLV or not in order to identify the disk type (step 82).

In this case, since disk 10 is CLV, system microcomputer 40 judges YES at step 82.
Set the RAM A flag to 1 (step
134).

Then, the system microcomputer 40 again inputs the subcode from the digital signal processing circuit 34 and stores the time number included in the subcode in the time number area of the RAM (step 86).

Next, refer to the B flag to confirm that the frame number mode is currently specified (step 88), and then confirm from the A flag that the type of disk 10 is CLV (step 88).
90), the time number stored in the RAM is multiplied by 30 to obtain a frame number, and the frame number is stored in the frame number storage area (step 136).

Then, a frame display control signal based on this frame number is output to the frame/time display section 44 to display page information on the screen (step
92).

Next, the system microcomputer 40 checks the input from the operation unit 42 and determines whether or not the user has performed a key operation (steps in FIG. 5).
94) If no key operation has been performed by the user, the process returns to step 86 in FIG. 4 and the subcode is input from the digital signal processing circuit 34.
Frame number included in the subcode
Store in frame number area of RAM.

Next, check the B flag to confirm that the current mode is the time number mode (step 88), and refer to the A flag to confirm that the type of disk 10 is CLV (step 88).
90), converts the time number stored in the RAM into a frame number, outputs a frame display control signal corresponding to the converted frame number to the frame/time display section 44, and displays page information on the screen (step 92). ).

Similarly, if the frame number mode is specified and disk 10 is CLV, the page information on the screen is displayed while converting the frame number in the subcode read from disk 10 into a time number. .

This allows the user to access disk 10 of CLV.
You can know frame information during PLAY.

Here, when the user wants to know the playback elapsed time, press the frame/time switching key 56 of the operation section 42.
All you have to do is turn on and specify the time number mode.

At this time, the system microcomputer 40 inverts the B flag and sets it to 1, indicating that the time number mode is designated (steps 94 to 98 in FIG. 5).

Then, after that, the system microcomputer 40
After inputting the subcode at step 86 in the figure and storing the time number in the RAM, the B flag is checked (step 88), and since the B flag is 1, it is determined that the mode is in time number mode.

At this time, the system microcomputer 40
Proceed to 102, A flag is 1, disk 10 is
After confirming that it is a CLV, a time display control signal corresponding to the time number stored in the RAM is output to the frame/time display unit 44, and the elapsed playback time is displayed in minutes (step 106).

Next, the system microcomputer 40 checks the input from the operation unit 42 and determines whether or not the user has performed a key operation (steps in FIG. 5).
94) If no key operation has been performed by the user, the process returns to step 86 in FIG. 4 and the subcode is input from the digital signal processing circuit 34.
Save the time number included in the subcode to RAM
stored in the time number area.

Next, check the B flag to confirm that the current mode is time mode (step
88), the type of disk 10 is determined by referring to the A flag.
After confirming that it is a CLV (step 102),
A time display control signal corresponding to the time number stored in the RAM is output to the frame/time display section 44, and playback elapsed time information is displayed (step
106).

Similarly, when the time number mode is specified and the disc 10 is CLV, the elapsed playback time is displayed based on the time number in the subcode read from the disc 10.

This allows the user to access disk 10 of CLV.
You can know time information while playing.

After that, if the user wants to search by specifying a time, for example, if the destination is 32 minutes, first,
Numerical keys 64 and 62 of the numeric keypad of the operation unit 42
After turning on the search key 54 once in this order, turn on the search key 54 once.

Then, the system microcomputer 40 sequentially stores the numerical value in the numeric keypad area of the RAM by shifting it to the left every time the numerical key is turned on (steps 94, 106, and 108 in FIG. 5 are repeated).

As a result, the number 32 is stored in the RAM numeric keypad buffer as the designated time number.

Next, when the search key 54 is turned on, the system microcomputer 40 confirms that the A flag is 1 and the disk 10 is CLV (step 112).
Furthermore, after confirming that the B flag is 1 and the mode is time mode (step 138), a predetermined time search control is performed based on the designated time number stored in the numeric keypad buffer of the RAM (140).
When the optical pickup 14 moves to the position where the time number in the subcode read by the digital signal processing circuit 34 matches the specified time number stored in the numeric keypad buffer (YES in step 142), the system microcomputer 40
After clearing the numeric keypad buffer, servo part 3
Perform predetermined PLAY start control for 8 (step
122, 124), playback is performed from the position corresponding to the time number specified by the user.

This allows the user to search the CLV disk 10 by specifying a time number.

After the search is completed, the system microcomputer 40 controls the display of the elapsed playback time based on the time number of the subcode read from the disk 10 in the same manner as described above.

On the other hand, if the user wishes to search by specifying a frame, he or she first turns on the frame/time switching key 56 to specify a frame number mode.

At this time, the system microcomputer 40 inverts the B flag to 0, indicating that the frame number mode is specified (steps 94 to 98 in FIG. 5).

Next, for example, when the destination is 1530 frames, the user turns on the numeric keys 60, 68, 64, and 78 in the order of numeric keys of the operation unit 42 once, and then turns on the search key 54 once. .

When each numeric key is turned on, the system microcomputer 40 sequentially stores the corresponding numeric data into the numeric keypad buffer by shifting to the left.

Therefore, the numerical value 1530 is finally stored in the numeric keypad buffer of the RAM as the designated frame number.

Next, when the search key 54 is turned on, the system microcomputer 40 confirms that the A flag is 1 and the disk 10 is CLV, and further confirms that the B flag is 0 and is in frame number mode. After that (steps 110, 112, 138), the data in the numeric keypad buffer is converted to a designated time number divided by 30, and stored in the conversion data area (step 144).

Then, the process moves to step 140, where a predetermined time search control is performed on the servo section 38 using the data stored in the conversion data area as a specified time number, and the time number in the subcode read by the digital signal processing circuit 34 is converted. When the optical pickup 14 moves to a position that matches the specified time number stored in the data area (YES in step 142), after clearing the numeric keypad buffer, the servo section 38
PLAY start control is performed (steps 122, 124), and playback is performed from the position corresponding to the frame number specified by the user.

This allows the user to search the CLV disk 10 by specifying the frame number.

After the search is completed, the system microcomputer 40 multiplies the time number of the subcode read from the disk 10 by 30 and converts it into a frame number, in the same manner as described above, while converting the screen page based on the converted frame number. Controls the display of information.

According to this embodiment, if the user specifies the frame number mode, when the disc 10 is played, frame information is displayed based on the frame number of the subcode when the disc 10 is CAV, and when the disc 10 is CAV, the frame information is displayed based on the frame number of the subcode. Frame information is displayed after the code time number is converted to a frame number, so if disk 10
Users can know frame information regardless of CAV or CLV.

Also, if the user specifies the time number mode, when disk 10 is played, disk 1
When 0 is CLV, time information is displayed based on the time number of the subcode, and when it is CAV, time information is displayed after converting the frame number of the subcode to a time number, so whether disk 10 is CAV or not. Users can know time information regardless of CLV.

Further, when the user specifies the frame number mode, inputs the specified frame number using the numeric keypad, turns on the search key 54, and performs a search operation, when the disk 10 is CAV, a frame search is performed based on the specified frame number, When using CLV, a time search is performed by converting the specified frame number to a specified time number, so a search can be performed by specifying a frame number regardless of the type of disk, and the user can also specify the time number mode. When the specified time number is entered using the numeric keypad and the search key 54 is turned on to perform a search operation, if the disk 10 is CLV, a time search will be performed based on the specified time number.
In the case of CAV, a frame search is performed by converting the specified time number to a specified frame number, so a search can be performed by specifying the time number regardless of the type of disk.

In addition, in the above embodiment, when performing a search,
For example, when the frame number mode or time number mode and the disc type are different.
When using a CLV disk, when a search operation is performed under frame number mode, the specified frame number stored in the numeric keypad buffer is converted to a specified time number, and the search is performed using the converted specified time number as the destination. However, different from this, the search may be performed while converting the time number of the subcode read from the CLV disk into a frame number during the search until it matches the data in the numeric keypad buffer.

Also, while the disc is playing, only one of the frame information and time information is displayed, but based on both the time number or frame number read from the disc and the converted frame number or time number, , both frame information and time information may be displayed simultaneously.

Further, although the frame information and time information are displayed in the frame/time display section, they may be superimposed on the video screen.

Furthermore, if the optical disc playback device is equipped with a digital frame memory, it is possible to advance the CLV disc frame by frame by using the frame number converted from the time number of the CLV disc.

Furthermore, by applying the present invention to an optical disc playback device that can play not only LDs but also CDs, it is possible to handle all types of discs in a timely manner.

[Effect of the invention]

The optical disc playback device of this invention converts the frame number of the subcode read by the subcode reading means into a corresponding time number by the conversion means, and converts the frame number read from the time number read by the subcode reading means into a corresponding frame number. Therefore, regardless of the type of disk, either the frame number or time number related to the current position of the disk can be obtained and used for display or other purposes.

According to another optical disc playback device of this invention, the determination means determines whether the type of disc identified by the disc identification means matches the type of designated number inputted by the search number input means;
When the determination means determines that there is a mismatch, the conversion means converts the specified frame number input by the search number input means into a corresponding specified time number,
The specified time number input by the search number input means is converted into a corresponding specified frame number, and the search control means converts the specified time number inputted by the search number input means into a corresponding specified frame number.
By using search control with the specified frame number as the destination when indicating CAV, and using search control with the specified time number as the destination when indicating CLV, regardless of the type of disk, the search control can be performed according to the user's preference. , it is possible to perform both a search by specifying a frame and a search by specifying a time.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an optical disc playback device according to one embodiment of this invention, Fig. 2 is an external view of the operating section in Fig. 1, and Fig. 3 is a RAM of the system microcomputer in Fig. 1. FIGS. 4 and 5 are flowcharts showing the operation of the system microcomputer in FIG. 1. Explanation of main symbols, 10... disk, 14...
Optical pickup, 34...Digital signal processing circuit, 40...System microcomputer, 4
2...Operation unit, 44...Frame/time display unit.

Claims (1)

[Claims for Utility Model Registration] (1) Optical disc playback capable of playing back both CAV discs and CLV discs and having subcode reading means for reading subcodes including frame numbers or time numbers from digital signals detected from the discs. The apparatus further comprises a conversion means for converting a frame number of a subcode read by the subcode reading means into a corresponding time number, and converting a time number read by the subcode reading means into a corresponding frame number. An optical disc playback device featuring: (2) A subcode reading means that can play both CAV discs and CLV discs, reads a subcode including a frame number or time number from the digital signal detected from the disc, and identifies whether the disc is CAV or CLV from the subcode. In an optical disc reproducing apparatus, the optical disc reproducing apparatus includes a disc identification means for inputting a designated frame number or a designated time number for searching, a search control means for performing search control according to the designated frame number or designated time number, a determination means for determining whether the type of disk identified by the disk identification means matches the input content of the search number input means; and when the determination means determines that they do not match, the specified frame number input by the search number input means is converting means for converting the specified time number inputted by the search number input means into a corresponding specified frame number; 1. An optical disc playback device characterized by performing search control using a designated frame number as a destination when indicating CLV, and performing search control using a designated time number as a destination when indicating CLV.