JP3468238B2 - Playback pause circuit of disc player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] TECHNICAL FIELD The present invention relates to a digital audio
From the recording medium on which the compressed data of the
Read data, write to memory,
Disk read from the memory at a constant data rate.
The present invention relates to a playback pause circuit for a layer. [0002] 2. Description of the Related Art The applicant of the present invention has previously entered a digital
Bit compression of the audio signal
For example, a technology that records in bursts as a recording unit
For example, Japanese Patent Application No. 2-169977, Japanese Patent Application No. 2-22136
4, Japanese Patent Application No. 2-221365, Japanese Patent Application No. 2-2228
No. 21, each specification and drawings of Japanese Patent Application No. 2-222823.
And so on. [0003] This technology uses a magneto-optical disc as a recording medium.
For example, using a so-called CD-I (CD-inter
Active) and audio data files on CD-ROM XA
AD (adaptive difference) PCM
Audio data or other formats
Record digital audio data encoded by
For recording and playback. This bit-compressed digital
For audio data, a predetermined data amount is used as a recording unit,
For example, every 32 sectors,
Sectors for linking (linking in consideration of interleaving)
(Sectors) before and after, and burst (intermittent)
Data is recorded continuously. Here, for example, a so-called standard CD (core
Format (CD-DA format)
Mat) data or analog audio signals
So-called straight PC obtained by simply linear quantization
M audio data is recorded with approximately 1/4 bit compression.
Consider the case of recording and playback. This approximately 1/4 bit pressure
Playback time of the recorded disc (play time
The straight PCM data before compression, for example,
When recording data in the CD-DA format
It is almost four times. This is the standard one for smaller discs
Recording / playback time comparable to a 2cm CD
Therefore, the size of the device can be reduced. Also, record
The raw (instantaneous) bit rate is converted to the standard CD-D
By using the same format as A format,
The time required for recording and playback is approximately 1/4
So that the remaining 3/4 of the time is
Can be assigned to a lie or the like. Specifically, for example,
When recording data, make sure that the recording was successful.
Verification (verification) operation or when recording was not performed normally
Rewriting operation, etc., and during playback,
Re-reading operation when the error rate of reproduced data is high
You. As a result, for example, the mechanical part vibrates due to disturbance.
Under bad conditions where the focus or tracking may be lost
Recording and playback can be performed more reliably,
It can be applied to a mold device. [0005] Such a bit compression of approximately 1/4
To record and play back digital audio data,
Buffer memory for recording and / or reproducing compressed data
Needed. This memory stores compressed data during recording.
Is written continuously at a constant rate, and is approximately four times faster
They are read out in bursts or intermittently. This berth
The amount of data at the time of data reading is the recording unit described above.
Is a predetermined data amount, for example, 32 sectors.
A few sectors for linking are added before and after the
Spatially recorded on the disk (continue to the previous recorded part)
Is recorded. Also, during playback, burst-like
Or intermittently, the above-mentioned predetermined recording
Data amount (for example, 32 sectors + several cells for linking)
The data for linking before and after
And write the data to the buffer memory. this
Read compressed data continuously from the memory at the above constant rate.
put out. Here, the recording and / or reproducing battery is used.
The total storage capacity of the_T  And the above compression
The amount of data that has been written and not yet read
(Unread data amount) and do not destroy this unread data
The remaining storage capacity of the writable memory (writable capacity
Amount) is M_T  Becomes For such memory
The control of writing and reading will be described below. At the time of recording, the buffer memory
Write control of the above compressed data at a constant data rate
At the same time, the unread data amount is a predetermined amount M_K  More than
At a read rate higher than this write data rate
Per recording unit (for example, every 32 sectors + several sectors)
Read in bursts and record on a recording medium such as a disc.
Is controlled as follows. Still recorded on this recording medium
Unread data is regarded as unread data in the memory.
You. Here, due to disturbances such as vibrations, etc.,
If the recording operation was interrupted or recording could not be performed normally
The amount of unread data in the above memory does not decrease
The data amount is the total storage capacity M of the above memory_TClose to
This unread due to compressed data written at a constant rate
Data may be corrupted. With this in mind,
The writable capacity of the buffer memory is (M_T  -M_K  )
Recording on a recording medium at a stage below
In other words, make sure that the storage capacity of the writable area
Recording can be interrupted or performed normally.
Prevents destruction of unread data
Is what you do. The above (M_T  -M_K  ) To the medium
Assuming the time required for restoring or re-recording the recording
The compressed data at the constant data rate
Must be set so that the operation of writing
I just need. At the time of reproduction, a burst
Compressed data that has been read in
It is controlled to read at a constant data rate.
The amount of unread data in the memory is equal to a predetermined amount M_L
If the value is less than, the data is read from the recording medium in bursts and
It is controlled to write to. This is
Data reading from recording media such as disks
Even if the data cannot be normally read, the remaining unread data amount M
_L  Reading at a constant rate.
So that the playback operation is not interrupted by the
It was made. This unread data amount M_L  Is like
Required to read the recorded data from the recording medium again.
Compressed data from the memory at the constant rate
It may be set to such an extent that the reading operation can be continued. [0009] The general problem is that
In loose CD (compact disc) players,
Accessibility of using disks (accessibility
1) Stop playback operation temporarily by making the best use of
Pause function to stop and music selection to select and play the desired music
Playback function, repeat one song or all songs on disc
One song / all songs repeat function to play, or B from arbitrary A point
Includes A / B repeat function, etc. that repeats playback up to the point
There are many things. By using these functions,
Not only saves time and effort in operation, but also
It also spreads the way you stain. [0010] Such a function is used for the compression data as described above.
Data to a recording / playback device or a playback-only device
When the buffer memory for reproduction is used
From the currently playing audio signal and the disc
There is a time lag with the audio signal being read,
There is a problem in responsiveness. Also, add these functions.
A simpler configuration is desirable. The present invention has been made in view of such circumstances.
With the simple configuration, the above playback operation is temporarily
A disc player that can realize a pause function to stop
The purpose is to provide a playback pause circuit for the player. [0012] SUMMARY OF THE INVENTION According to the present invention, there is provided a digital
The audio signal playback device compresses the time axis from the disk.
Playback means for playing back audio data,
Time-base compressed audio data obtained by
Write at a first data transfer rate and
Memory read at a second data transfer rate lower than
Means, and the time axis compression read from the memory means.
Converter that converts audio data into analog signals
Stage and the time-base compressed audio stored in the memory means.
Audio data so that a predetermined amount of audio data is secured.
Intermittent operation control and writing of the memory means
And read control of the memory means.
And control means for restricting during the pause period.
The time-base compressed audio data stored in the means is
It is held during the pause period, and the above menu is displayed according to the pause release operation.
Release the restriction on reading from memory means
Re-read the time axis compressed audio data
By opening it, the above-mentioned problem is solved. [0013] [Function] When the pause key is input, the
By stopping data reading, audio playback
When the production is stopped, the data stored in the memory
Data is held during the pause period, and
As data reading progresses, writing to the above memory
Even if the data is lost, the memory control
Data reading is stopped, and a standby state is realized. Also,
When the memory is released, the data read from the memory
Will be resumed. [0014] FIG. 1 shows a disk player according to the present invention.
Disc recording using one embodiment of the playback pause circuit
FIG. 3 is a block circuit diagram illustrating a schematic configuration of a playback device. In FIG. 1, recording on an optical disk 2 or the like is performed.
Bit-compressed digital audio signals are recorded on the medium.
Have been. This recording signal is recorded by the optical head 3 in a predetermined manner.
Burst in units (for example, 32 sectors + several sectors)
Data for reading, descrambling and error correction decoding
Obtain bit-compressed audio data via coder 21
You. This compressed data is stored in RAM (random access memo
), Etc., and write
Read at a constant data rate, and perform bit compression on the recording side.
Decoder 23 for restoring (decompressing) and decoding
The reproduction of the audio signal is carried out via this. Here, the compressed data for the memory 22 is stored.
In the write operation control of the data, the data amount in the memory 22 is constant.
When the amount becomes equal to or less than the
The compressed data is read, written into the memory 22, and
While there is free space available for data writing in the memory 22
Keeps reading and writing data one after another,
When the area becomes less than a certain value and writing becomes impossible,
When the memory becomes substantially full, reading from the recording medium
Stop taking, for example, the optical head 3
Keep tracing the same track position or read next
Control is performed so as to be in a standby state near a power position. The write control for such a memory 22
In the device to be controlled, the key input operation unit 8
When the STOP (pause) key is operated, the system
System controller 7 stops the read operation from memory 22.
To stop. Therefore, it responds quickly to key input (instantaneous
2) The audio signal output from the analog output terminal 26 is
It disappears and is switched to a silent state. At this time,
The compressed data can be read from a recording medium such as a disk 2.
Performed and written to the memory 22,
When the free space in the disk becomes equal to or less than the predetermined value, the optical disk 2
Automatically stops reading data from any storage media
And the servo system and control
The pause control including the rule system can be realized. This pose
In the state, the pause release operation is performed by the key input operation unit 8.
Read from the memory 22 when the
Restart the ejection operation. Quick response to key operation
(Instantly) audio from the analog output terminal 26
A signal output is obtained. During the pause state, D
Mute system for / A converter 24 and low-pass filter 25
You may control it. Therefore, such a disk recording / reproducing apparatus
Respond to pause operations using the original functions
To stop reading compressed data from the memory 22
Simple configuration, responding to pause key input operation
Instantly mutes the playback sound and
The stop state is realized even in mechanical operation. Also, Po
Can be easily released. Hereinafter, the specific configuration shown in FIG. 1 will be described in detail.
This will be described in detail. Rotated by a spindle motor 1
As the optical disk 2, for example, a magneto-optical
A disk or the like is used. However, in the case of playback only,
Aluminum same as usual CD (compact disc)
A reflective film type optical disk can also be used. this
Recording and recording on an optical disk (for example, a magneto-optical disk) 2
The optical head 3 for performing and / or reproducing is, for example,
Laser light sources such as laser diodes, collimator lenses,
Objective lens, polarizing beam splitter, cylindrical lens
And optical parts such as
It consists of a photo detector and the like. This optical head
3 is paired with the magnetic head 4 via the magneto-optical disk 2.
It is provided in the position facing. Data is stored on the magneto-optical disk 2.
When recording data, the head drive circuit of the recording system described later is used.
The magnetic head 4 is driven by the path 16 according to the recording data.
And the optical head 3
Irradiating the target track of the optical disk 2 with laser light
Performs thermomagnetic recording by a magnetic field modulation method. Also
The optical head 3 emits a laser beam applied to a target track.
Reflected light is detected, for example, by the so-called astigmatism method.
Focus error is detected, for example, so-called push-pull
The tracking error is detected by the method. Magneto optical disc
When reproducing data from the disk 2, the optical head 3
Simultaneously with detection of focus and tracking errors
The polarization angle of the reflected light of the laser beam from the target track
(Rotation angle) to generate a reproduction signal. The output of the optical head 3 is supplied to the RF circuit 5
Is done. The RF circuit 5 outputs the signal from the output of the optical head 3
Extract the focus error signal and tracking error signal.
And supplies the reproduced signal to the servo control circuit 6.
Is supplied to a decoder 21 of a reproduction system to be described later.
You. The servo control circuit 6 includes, for example, a focus sensor.
Control circuit, tracking servo control circuit, spindle
Motor servo control circuit, thread servo control circuit, etc.
It is composed of The focus servo control circuit is
Optical head so that the focus error signal becomes zero
The focus control of the optical system 3 is performed. Also the above truck
The tracking servo control circuit generates the tracking error signal
Tracking of the optical system of the optical head 3 so that it becomes zero
Perform control. Furthermore, the spindle motor servo control circuit
The path rotates the magneto-optical disk 2 at a predetermined rotational speed (for example, a constant rotational speed).
Linear motor) to control the spindle motor 1 to rotate.
I will. In addition, the above-described thread servo control circuit is
Of the magneto-optical disk 2 specified by the
Move the optical head 3 and the magnetic head 4 to the target track position.
Move. Servo control circuit that performs such various control operations
The path 6 controls the operation of each part controlled by the servo control circuit 6.
Information indicating the operation status is supplied to the system controller 7.
I have. A key input operation is performed on the system controller 7.
The unit 8 and the display unit 9 are connected. This system controller
The roller 7 is controlled by operation input information from the key input operation unit 8.
Controls the recording and playback systems in the specified operation mode.
U. The functions realized by this key operation include playback
Pause function to temporarily stop the operation, or select a desired song
Automatic song selection function to play back songs,
One song / all song repeat function that repeatedly plays all songs,
A / B repeater that repeatedly plays from point A to point B
Port function and the like. Also, the system controller 7
Is the header time from the recording track of the magneto-optical disk 2.
Units reproduced by Q data of subcodes and subcodes
Optical head 3 and magnetic head based on the address information of
Recording position on the above recording track traced by code 4
And playback position. The display unit 9 displays the recording position or
Indicates the playback position information and the device selected by the key operation.
Noh information is displayed as needed. Next, the recording system of this disk recording / reproducing apparatus
explain about. An analog audio input from the input terminal 10
Force signal A_INA / D conversion through the low-pass filter 11
To the heat exchanger 12. The A / D converter 12 is provided with
Analog audio input signal A_INQuantized and obtained
The digital audio signal is, for example, AD (adaptive difference)
Encoder 13 for high efficiency encoding processing such as PCM
Supplied. Also, external digital audio signals
Signal to the digital input interface circuit (shown
May be supplied to the encoder 13 via the
No. The digital audio input to the encoder 13
Io PCM signals are not subjected to compression processing or the like.
Straight PCM data.
CD (Compact Disc) Format (CD
−DA format), the sampling frequency is
PCM with 44.1 kHz and 16-bit quantization bit rate
Data. This input audio PCM data
Is, for example, approximately 1/4 bit by the encoder 13.
High-efficiency bit compression processing is performed to achieve the rate. Next, the memory 14 writes data and
The reading is controlled by the system controller 7, and the
Bit compressed data supplied from the encoder 13
And record it on the disk as needed.
Used as a buffer memory. Ie example
For example, in the 1/4 bit compression mode, the standard
CD-DA format data transfer speed (bit
Of the constant bit rate reduced to approximately 1/4 of the
The compressed data is continuously written to the memory 14. this
When recording the compressed data on the magneto-optical disk 2,
Same disk rotation speed as standard CD-DA format
Burst at the same data transfer rate below degree (constant linear velocity)
It is recorded discretely or discretely. Ie recording mode
The actual recording time of the signal is approximately 1
/ 4, and recording is not performed for the remaining 3/4 of the time
It is a suspension period. However, on the magneto-optical disk 2,
The next recording follows the area recorded just before the suspension period.
So that continuous recording is performed on the media surface.
I have. This allows, for example, a standard CD-DA format.
The same recording density and memory pattern as the mat are recorded.
Will be. For this reason, the standard
Bits corresponding to the data transfer speed of the CD-DA format
The compressed data is read out in bursts at a rate,
The read compressed data is interleaved and
Error correction encoding processing, EFM modulation processing, etc.
Is supplied to the encoder 15. Here, the memory 14
The data string supplied to the encoder 15 has a predetermined
One cluster consisting of several sectors (for example, 32 sectors)
It is a unit that is continuously recorded in one recording, and this is
Code processing, the amount of data for one cluster is reduced.
The amount of data with several sectors for raster connection added
You. This sector for cluster connection is
The interleave length is set longer than the interleave length.
Will not affect data in other clusters
I have to. Details of the recording in cluster units
Will be described later with reference to FIG. The encoder 15 reads the data from the memory 14 as described above.
As described above, recording data supplied in bursts
Encoding for error correction (parity addition and input
(Tarley processing), EFM encoding processing, and the like. this
Recorded data that has been encoded by the encoder 15
Is supplied to the magnetic head drive circuit 16. This magnetic
The head drive circuit 16 is connected to the magnetic head 4,
A modulation magnetic field corresponding to the recording data is applied to the magneto-optical disk 2.
The magnetic head 4 is driven so as to apply the voltage. The system controller 7 has a memory
14 and the memory control as described above.
Read from the memory 14 in burst by the memory control of
The above recorded data is recorded on the recording track of the magneto-optical disk 2.
The recording position is controlled so that recording is continuously performed on the recording medium. This
The control of the recording position is performed by the system controller 7.
The recording data read in bursts from the memory 14
The recording position of the magneto-optical disk 2
Control signal for designating the recording position on the servo control circuit 6
Is performed by supplying the Next, a reproducing system of the disk recording / reproducing apparatus will be described.
Will be described. This reproducing system uses magneto-optical
Recording continuously recorded on the recording track of the disk 2
For reproducing data, the optical head 3
The recording tracks of the magneto-optical disk 2 with laser light.
The recording signal from the magneto-optical disk 2
Read. Here, the magneto-optical disk 2 is the standard
Rotation speed (linear speed-1)
CD-DA format)
Burst (discrete) recording signal at the same data transfer speed as
Is read and binarized by the RF amplifier circuit 5.
The data is supplied to the decoder 21. The decoder 21 operates in the above-described recording system.
And the RF circuit 5
Deinterleaving of the binarized playback output
Decoding and EFM demodulation for processing and error correction
Performs processing and converts the above 1/4 compressed data to the standard
At the same data transfer rate as a typical CD-DA format
Output in a cost-like manner. Obtained by this decoder 21
The reproduction data is supplied to the memory 22. The memory 22 writes and reads data.
Is controlled by the system controller 7, and
Same as the above standard CD-DA format
Playback data supplied in bursts at the data transfer rate
Written. The memory 22 stores the burst
The above-mentioned reproduction data written in a fixed bit rate
Abbreviation of the standard CD-DA format
The data is continuously read at a data transfer rate of 1/4. The system controller 7 provides such a
Memory for writing / reading the reproduction data to / from the memory 22
Control is performed, and the memory 22 is controlled by this memory control.
The reproduced data written in bursts from the
Play back from the recording track of disk 2
Control the raw position. This playback position control is controlled by the system
Burst read from memory 22 by controller 7
By controlling the reproduction position of the reproduced data output,
Control for specifying a playback position on a recording track of the disk 2
This is performed by supplying signals to the servo control circuit 6.
You. From the memory 22, a conversion of approximately 1/4 of the standard
Playback data read continuously at the transmission speed (bit rate)
The compressed data obtained as data is supplied to the decoder 23.
Is done. The decoder 23 is an encoder of the recording system.
13 corresponding to, for example, 1/4 compressed data
Is expanded by four times (bit expansion), for example.
6-bit digital audio data is reproduced. This
The digital audio data from the decoder 23 of
It is supplied to the D / A converter 24. The D / A converter 24 is supplied from the decoder 23.
Digital audio data supplied into analog signals
After conversion, the signal is output to the output terminal 26 through the low-pass filter 25.
Analog audio output signal A_OUT  Is output. By the way, such a disk recording / reproducing device
The magneto-optical disk 2 used for the installation has a stereo audio
The capacity that can record 60 minutes or more and about 74 minutes with an e-signal
It is desirable that the data compression ratio be, for example, 1/4 of the above.
, About 130 Mbytes are required.
In addition, a portable or pocket-sized record and / or
Or, in order to configure a reproducing apparatus, the outer diameter of the disc is 8c.
m or smaller diameter discs
Good. In addition, track pitch and linear velocity
Has a track pitch of 1.6 μm and a linear velocity of 1.
It is desired to be 2 to 1.4 m / s. These conditions
For example, a disk satisfying
4mm, data recording area 61mm outside diameter, data recording
The inner diameter of the area is 32 mm, the inner diameter of the lead-in area is 30 mm,
The center hole diameter may be 10 mm. This disk
In a 70mm x 74mm disk caddy
If you supply it to the market,
Recording / reproduction to / from the disc is possible with the recording / reproduction device
Becomes In addition, 72 minutes or more in the above 1/4 data compression mode
Disc data for enabling recording and playback for about 76 minutes
The range of the inner and outer diameters of the data recording area
From the outer diameter of 60 mm to 62 mm when the diameter is 32 mm, the inner diameter
In the range of 71 mm to 73 mm when the outside diameter is 50 mm
It may be set appropriately. Next, the disk recording and reproduction as described above is performed.
Further details on the basic recording and playback operations
This will be described in detail. First, the recording data (read from the memory 14)
Data) is a fixed number (for example, 32) of sectors
(Or blocks).
Several sectors for cluster connection are arranged between rasters
It is in the form that was. Specifically, as shown in FIG.
Cluster C consists of 32 sectors (blocks) B0-B31
And each of these clusters C has four
Sectors L1 to L4 for connection (for linking) are
Connected to the raster. Where one cluster, example
For example, the k-th cluster C_k  If you want to record
Cluster C_k  Not only the 32 sectors B0 to B31,
3 sectors forward, 1 sector backward, connecting sector
Cluster C_k-1  2 for run-in block on the side
Sectors L2 and L3 and one sector L4 for sub data
And cluster C_{k + 1}  Side run-out block
A total of 36 sectors including one sector L1
I try to keep a record. At this time, these 36
Data from the memory 14 to the encoder 15
The encoder 15 performs an interleave process.
As a result, up to 108 frames (about 1.1 sections)
Are sorted), but the above class
TA C_k  The data in
It is well within the range of Kuta L1 ~ L4, other classes
TA C_k-1  And C _{k + 1}  Has no effect on
Note that, for example, dummy data such as 0 is allocated to the sectors L1 to L3.
The auxiliary sub data is allocated to sector L4.
Of the original data due to the interleave processing.
The effect can be avoided. Here, the main data sector B0
~ B31 is 000 in 8-bit binary number (2-digit hexadecimal number)
0 0000 (00H) to 0001 1111 (1FH) sector number
Are added, and 001 is added to sector L1 of the linking portion.
0 0000 (20H) and 0011 1101 (3DH)
[0011] Sector numbers of 1111 (3FH) are respectively added.
I have. In addition, the above cluster includes a linking section.
For example, 36 sectors including
No. The recording in such a cluster unit is performed.
Interleaving with other clusters
Eliminates the need to consider mutual interference
It is greatly simplified. Also out of focus, track
Recording data during recording due to misalignment or other malfunction.
If the data could not be recorded normally, the above cluster unit
For re-recording and effective data reading during playback
If not, you can re-read in cluster units
You. Incidentally, one sector (block) is 235.
It consists of 2 bytes, 12 bytes for synchronization,
23 for 4 bytes for data and data D0001 to D2336
36 bytes are arranged in this order. This sector structure
12 bytes for synchronization in the structure (block structure)
Means that the first byte is 00H (H indicates a hexadecimal number)
10 bytes of FFH follow, the last byte is 00H
Has become. The next 4-byte header is one byte each.
After the minutes, seconds, and the address part of the block,
It consists of one byte for code information. This mode information
Is mainly for indicating the mode of the CD-ROM.
Yes, the internal structure of the sector shown in FIG.
This corresponds to the mode 2 of the format. CD-I
This is a standard using the mode 2 of FIG. In the specific example shown in FIG.
Indicates the format for recording data
From the beginning of the 2336-byte area,
Da, 18 groups of sound groups of 128 bytes each
SG01 to SG18, a space area of 20 bytes, and
They are arranged in the order of the 4-byte reserve area. 8 above
The byte subheader contains a 1-byte file number,
The channel number, submode, and data type are repeated twice.
It was placed back. By the way, data of such a sector structure is
Is recorded on the disk by the encoder 15.
Encoding processing including parity addition and interleave processing
3 and EFM (8-14 modulation) processing is performed.
Recording is performed in a recording format as shown in FIG. In FIG. 3, one block (one section)
98 frames from the first frame to the 98th frame
One frame is composed of a channel clock period T
588 times (588T), 24T (+ contact) in one frame
3T) frame synchronization pattern portion, 14T
(+ Connection bit 3T) subcode part and 544T
Data (audio data and parity data) part
Is provided. The data part of 544T is 12 bytes
(12 symbols) audio data, 4 bytes Paris
Data, 12 bytes of audio data, and 4 bytes
The parity data of the unit is so-called EFM modulated
And the audio data in one frame is 24 bytes
(Ie, one word of audio sample data is 16 words)
12 words). The above sub
In the code part, 8-bit subcode data is EFM modulated
It is divided into 98 frames.
Thus, each bit constitutes eight subcode channels P to W.
Has formed. Where the subcodes of the first and second frames
The part is out of rule of EFM modulation (out-of-rule).
Lock synchronization pattern S_0,S₁  And each sub
Code channels P to W extend from the third frame to the 98th frame.
Each of them has 96 bits. The audio data is interleaved.
Recorded during playback, but it is deinterleaved during playback.
Of the data array that has been processed
Odata Instead of this audio data,
General CD-I data and the like can be recorded. Incidentally, the disk recording / reproducing apparatus shown in FIG.
In the configuration, the system controller 7 operates as shown in FIG.
Thus, the write pointer W of the memory 14 is
Increments continuously at a rate corresponding to the bit rate of the
And write continuously and stored in this memory 14
The unread data amount of the compressed data is a predetermined amount M_Kthat's all
, The read pointer R of the memory 14 is set to the standard
Burst at a transfer rate according to the standard CD-DA format
Incremented by a predetermined unit (for example, 32
Memory control is performed so as to read out each time. Follow
In the memory 14, the unread data may be destroyed.
The amount of data that can be written, that is, the recordable capacity,
Predetermined amount (M_T  -M_K  )
And Here, a burst reading from the memory 14 is performed.
The output recording data is transmitted by the system controller 7.
The recording position on the recording track of the magneto-optical disk 2 is controlled.
In this way, on the recording track of the magneto-optical disk 2,
It can be recorded in a continuous state. And above
As shown in FIG.
Area is secured, so track disturbances
System controller 7 detects that
The recording operation on the magneto-optical disk 2 is interrupted
The input data is also stored in the recordable area of the predetermined amount or more.
Can continue to be written, and during that time
Input data on the recording track of the magneto-optical disk 2.
Data can be recorded in a continuous state. The magneto-optical disk 2 has the above-mentioned cell.
Header time data corresponding to the physical address of the
The compressed data is added and recorded for each sector. Ma
The catalog data indicating the recording area and the recording mode is TO
It is recorded in a catalog area such as the C area. Next, in the disk recording / reproducing apparatus of FIG.
In the reproduction system, the system controller 7 is configured as shown in FIG.
Thus, the write pointer W of the memory 22 is
-Increment at transfer rate according to DA format
And write in bursts, and read memory 22
Pointer R according to the bit rate of the compressed data.
The data is read out by continuously incrementing at the speed
Pointer W catches up with the read pointer R (the
Stop writing when the
The unread data amount stored in the memory 22 is a predetermined amount.
Quantity M_L  Memory control to write when
I do. Therefore, the predetermined amount M is always stored in the memory 22._L  that's all
While securing a data read area of unread data amount
Then, the reproduction data can be read continuously from the memory 22.
Can be. The data written to the memory 22 in a burst is
The raw data is stored in the magneto-optical
By controlling the playback position on the recording track of disc 2
That is, a continuous state on the recording track of the magneto-optical disk 2
Can be played in a state. Moreover, as noted above,
The predetermined amount M is always_L  Data read area above
Jumps due to disturbance, etc.
The system controller 7 detects that
When the reproducing operation for the magneto-optical disk 2 is interrupted
Is the predetermined amount M_L  From the above data read area,
Read raw data and output analog audio signal
Be able to continue, and during that time perform the return operation
Can be. The present invention is not limited to the above embodiment.
For example, the sections that make up the cluster
The number of data is not limited to 32.
May constitute one cluster with the number of sectors.
No. As a recordable disc, a magneto-optical disc
Without limitation, phase change optical discs, organic dye optical discs
H, PHB (photochemical hole burning) light
If only the present invention can be applied to discs, etc.
Card media and sheet media in addition to disc media.
The present invention can be applied to a body or a tape-shaped medium. [0053] As is clear from the above description, the present invention
According to the playback pause circuit of the disc player according to the present invention,
A playback method that plays back time-compressed data from a disc
And the reproduction data obtained by the reproduction means are stored in the first data storage unit.
Data at the data transfer rate, and
Memory means for reading at a low second data rate;
The data read from the memory means is converted into an analog signal
Conversion means for converting the data into data, and data stored in the memory means.
Intermittently operate the above-mentioned reproducing means so as to secure a predetermined amount of data.
Operation and control of writing and reading of the memory means.
And the read control of the memory means is paused.
Control means for limiting all the time, and stored in the memory means.
The paused data is retained during the pause period, and the pause release operation is performed.
Release the restriction on reading from the memory means according to
Restarting the read operation of the held data
When the pause starts, audio playback stops instantly.
When the pause is released, the data from the memory
Data reading is resumed and data read from the recording medium
Restarts. Here, the above-mentioned memory control operation is performed by a disturbance.
Continuous data regardless of servo system disturbances
This is done to play back to this memory control
By using the motion, the pause function can be easily realized.
You.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block circuit diagram showing a configuration example of a disk recording / reproducing apparatus using an embodiment of a reproduction pause circuit of a disk player according to the present invention. FIG. 2 is a diagram showing a format of a cluster structure serving as a recording unit on a recording medium. FIG. 3 is a diagram showing a format of a frame and a sector (block) in the standard of a so-called CD (compact disk). FIG. 4 is a diagram showing a state of a memory whose memory is controlled in a recording system of the disk recording / reproducing apparatus of FIG. 1; FIG. 5 is a diagram showing a state of a memory whose memory is controlled in a reproducing system of the disk recording / reproducing apparatus of FIG. 1; [Description of Signs] 2 magneto-optical disk, 3 optical head, 4 magnetic head, 6 servo control circuit, 7 system controller, 10 analog audio signal input terminal, 1
2 A / D converter, 13 encoder for data compression processing, 14, 22 memories, 15 encoders, 1
6 magnetic head drive circuit, 21 decoder, 23
Decoder for data decompression processing, 24 D / A converter,
26 Analog audio signal output terminal

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-40269 (JP, A) JP-A-2-203469 (JP, A) JP-A-1-78483 (JP, A) JP-A-3-78 34156 (JP, A) JP-A-60-50784 (JP, A) JP-A-4-319573 (JP, A) JP-A-2-46989 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 20/10 G11B 19/00-19/16

Claims (1)

(57) Patent Claims 1. A audio compressed time axis than disk
Reproducing means for reproducing O data, writes the audio <br/> data obtained are time warp from said reproducing means at a first data rate, the second low speed than the first speed a memory means for reading the data transfer rate, O, which is time-base-compressed read from said memory means
Converting means for converting the audio data into an analog signal; and a time axis compressed audio stored in the memory means.
The O data as well as intermittently operating controls said reproducing means so as to ensure a predetermined amount, and controls the writing and reading of said memory means, and a control means for limiting in the read control the pause period of said memory means The time-base compressed audio data stored in the memory means.
O data is held during the pause period, the disc player, characterized in that to resume the release to the holding time axis compressed audio data read operation the read restriction from said memory means in response to the pause release operation Play pause circuit.