JP3438729B2 - Playback device control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the recording of digital signals.
Data from the read optical disc and
Playback that plays while writing and reading
The present invention relates to a device control method. [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,
A pause function for temporarily stopping the playback operation, or a desired song
Select and play a song
1 song / all song repeat function to play all songs repeatedly
Or A / B to repeat playback from any point A to point B
A repeat function is added. In addition, digital
Audio signal, so-called CD-ROM
Including the case where it is used for recording and playback of general data such as
To stop playback and resume playback from the same position.
That a so-called resume function is added
There are many. By using these functions,
Not only saves you time, but also gives you more ways to enjoy audio.
It will also be creeping. [0010] Such a function is used for the compression data as described above.
Data to a recording / playback device or a playback-only device
Especially when trying to achieve the above resume function
That the buffer memory for reproduction is used
From the currently playing signal and the
There is a time lag between the signal and the signal at the time when playback was interrupted.
It is possible to start playback at the time of the above restart so that it continues from the number
Have difficulty. Also, the structure for adding such functions is
The simpler the better. The present invention addresses this situation.
It was made in view of the above and has a simple configuration.
Optical disc that can realize a resume function
An object of the present invention is to provide a method of controlling a raw device. [0011] SUMMARY OF THE INVENTION A playback apparatus according to the present invention has
The control method is as follows.
Data compressed by the moving optical head
Data is read intermittently at the first speed and temporarily stored in memory.
And storing the memory at a second speed lower than the first speed.
Reads the compressed data stored in the
The signal being reproduced and the light
There is a time lag with the data being read from the disc.
Controlling the reproducing apparatus,
Detecting input of a disconnection instruction, and replaying the data.
If the input of the raw interruption instruction is detected,
Stop playback and stop playback from the above memory.
Reading the playback stop time information at the time of
The playback stop time information is recorded even when the power to the device is turned off.
Causing the holding means to hold the memory contents to store the contents;
Shutting down the power of the device, and resuming the reproduction.
And restarting playback from the point where playback was interrupted.
Resume mode for opening is set
Detecting that the resume mode has been set.
If it is detected that the
Based on the held reproduction stop time information, the optical
The recording position of the data corresponding to the stop time information of the disk
Control the head driving means so that
Control step.
Thus, the above-mentioned problem is solved. [0012] The address information of the data read from the memory is described.
Information is stored in the backup storage means, and the playback operation is performed.
Based on the backed up address information when the
Access the optical disk based on the
Read the recorded data from the corresponding disc position and
Playback while controlling writing and reading to memory
Therefore, the reproduction is continued from the interrupted content. [0013] DESCRIPTION OF THE PREFERRED EMBODIMENTS First, FIG. 1 shows a control method of a reproducing apparatus according to the present invention.
Of an optical disk recording / reproducing apparatus to which an embodiment of the present invention is applied
It is a block circuit diagram showing a schematic structure. 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. Also used as a system controller 7
CPU (Central Processing Unit) installed inside
Includes M and RAM, backup power supply such as battery
At least when the main power is cut off (power off)
The contents of RAM are backed up
I have. Instead of this main power off mode, the disk
Turns off only the operation power supply such as the rotation drive motor and servo circuit
A standby mode is provided to keep the CPU and other devices on during this time.
You may continue to do so. In addition, low power consumption type memo
The backup is provided separately for backup storage.
Keep backup memory only when power is turned off
You may do it. In an apparatus having at least such a configuration,
In the key input operation unit 8, first, a so-called
Switch between normal mode and other normal modes.
You. When switching to this resume mode is selected
Is operated by the playback stop button or power off button, etc.
Even if the playback operation is stopped by
If you select this option, the content will be
Playback resumes. In order to realize this resume function,
Time information about data read from the memory 22
Is stored in the backup memory. This reading
The time information of the output data is
Data including so-called header time in recorded data
If writing is being performed, read from the memory 22.
The time information such as the header time is used as it is. Me
When the above header time and the like are not written in the memory 22
Is a header for the data to be written to the memory 22.
Writing of time information such as datum time to the memory 22
Address difference between pointer and read pointer (specifically,
Corresponds to the above read data
The time information which calculated the time to perform is used. This read data
The time information corresponding to the data
If you write to the above backup memory when
However, during playback, this time information is always
Registers in controller 7 and backup memo
Time information to keep writing
Calculates the actual playback time, etc. based on the
You may make it do. The play stop button or
When the power off button is operated, the motor drive system and optical
Head drive system, servo circuit system, audio signal reproduction system, etc.
When the main power is turned off and the playback operation is stopped,
At least the above backup memory and if necessary
Only the power supply near the system controller 7 and CPU
Living mode, so-called sleep mode, Standa
Mode or power off mode. this
Time information stored in the backup memory
(Time information of memory read data when playback is stopped)
Be held. Next, the reproduction mode selection of the key input operation unit 8
When the button is operated, the system controller 7
Read memory from backup memory when playback is stopped
Access the optical head 3 based on the time information of the output data.
The time corresponding to the time information on the optical disc 2.
When the recording data is read from the
In both cases, the data read from the memory 22 is reproduced.
You. Therefore, the content that was interrupted when the playback was stopped
Playback is resumed. This is written to memory 22
When using the time information of the data
To read the data written in the memory 22
Time delay until playback stops immediately
When you resume playback, the continuity of the content will not be maintained
Such troubles can be avoided beforehand. Hereinafter, a specific configuration shown in FIG. 1 will be described in detail.
This will be described in detail. Rotated by spindle motor 1
The optical disk 2 is a recordable, for example, magneto-optical
A disk or the like is used. However, in the case of playback only,
Aluminum similar to a normal CD (compact disc)
An optical disk of a reflective film type can also be used. This
Recording on an optical disk (for example, a magneto-optical disk) 2
And / or optical head 3 for performing reproduction
For example, laser light source such as laser diode, collimator lens
Lens, objective lens, polarizing beam splitter, cylindrical
Has optical parts such as lens and light receiving part of predetermined pattern
It consists of a photo detector and the like. This optical
The head 3 is connected to the magnetic head 4 via the magneto-optical disk 2.
Is provided at a position opposite to the above. For magneto-optical disk 2
When recording data, a recording head
The magnetic head 4 is driven by the driving circuit 16 to record data.
A corresponding modulation magnetic field is applied and the optical head 3
A target track of the magneto-optical disk 2 is irradiated with a laser beam.
Thus, thermomagnetic recording is performed by a magnetic field modulation method.
The optical head 3 is used to irradiate the target
The reflected light of the light is detected, for example, by the so-called astigmatism method.
Focus error, for example, so-called push
A tracking error is detected by the pull method. Magneto-optical de
When reproducing data from the disk 2, the optical head 3 is moved upward.
When a focus error or tracking error is detected
At the same time, the polarization angle of the reflected light from the target track of the laser light
(Car 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. In the key input operation unit 8, the resume mode
A switching selection button and the like are provided. In addition, the system
The controller 7 moves from the recording track of the magneto-optical disk 2 to
Reproduced by data time, subcode Q data, etc.
Based on address information (time information) in sector units,
Note that the magnetic head 3 and the magnetic head 4 are tracing
Manage the recording position and playback position on the recording track. Display
9 includes information on the recording position or the reproduction position and the key
Information on the function selected by the operation is displayed as necessary
Is done. Here, for example, used for the system controller 7
Built-in RAM of a CPU and a separate low power consumption RA
M and the like are used as backup memories. This
The backup memory of at least the resume
When the mode is selected, the
Between the time information of the data to be
The data read from the memory 22 is
Time information is written. Then, the playback operation is stopped.
Power is supplied to this backup memory
The stored contents are kept. this
For operation of resume function using backup memory
This will be described later. Next, the recording system of this disk recording / reproducing apparatus
explain about. Analog audio from input terminal 10
E Input signal A_INIs transmitted through the low-pass filter 11 to A /
It is supplied to a D converter 12. A / D converter 12 is above
Analog audio input signal A_INQuantize and get
The digital audio signal obtained is, for example, AD (adaptive difference
Minute) Encoder 1 for high-efficiency encoding processing such as PCM
3 is supplied. In addition, external digital audio
Signal to the digital input interface circuit (shown
To the encoder 13 via the
Good. The digital audio input to the encoder 13
Dio PCM signals are not subjected to compression processing or the like.
This is loose PCM data.
Standard CD (compact disk) format (C
D-DA format), the sampling frequency
Is 44.1 kHz and the number of quantization bits is 16 bits.
Let it be M data. This input audio PCM data
The encoder 13 outputs, for example, approximately 1/4 bits by the encoder 13.
High-efficiency bit compression processing
You. 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. About the details of this cluster unit recording
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, this disk
The reproduction system of the recording / reproduction device will be described. This playback system
Is a recording track of the magneto-optical disk 2 by the above-described recording system.
For playing back recorded data continuously recorded on the
Of the magneto-optical disk 2 by the optical head 3.
By tracing the recording track with laser light,
A recording signal is read from the magnetic disk 2. here,
The magneto-optical disk 2 uses the standard CD-DA format described above.
Rotating at the same rotational speed (linear speed) as the
At the same data transfer rate as the CD-DA format
The recording signal is read in a burst (discrete) manner, and the RF signal is read.
The signal is binarized by the amplifier circuit 5 and supplied to the decoder 21.
You. 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)
The output data) has 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. 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, such sector-structured data
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 security.
Header time data corresponding to the physical address of the
Added to the above digital audio compression data for each sector
Recorded. Also, the recording area and recording mode
Is stored in a catalog area such as a TOC area.
You. Next, in the disk recording / reproducing apparatus shown in 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. Next, the key input operation section 8
Resume mode is selected, playback stop operation and
Example of the operation when the playback resume operation is performed after
And will be described with reference to FIGS. FIG. 6 shows that the reproduction mode switching selection operation is performed.
Shows the main routine at the time when the
After the normal processing is performed in step S1, the process proceeds to step S2.
It is determined whether a top (reproduction stop) request has been made.
You. In this step S2, NO (no stop request) is judged.
If separated, go to step S3 to resume
Mode is determined, if NO
Proceed to step S4 to play from the first song on the disc.
The operation starts. If YES in step S3 (Rigid
In the case of the sleep mode), the process proceeds to step S5,
Time information T when playback is stopped from the backup memory
_LASTIs read. This time information T_LASTabout
This will be described with reference to FIG. FIG. 7 shows key input processing by timer interruption.
This shows part of the operation, and a timer interrupt with a fixed time period
Normal processing was performed in step S11 according to the
Then, in step S12, key input scan and input key
A disconnection process is performed. In the next step S13, key input
A determination is made as to whether or not there is no
Sometimes the interrupt routine returns to the original main routine.
Turn (RET I). YE in step S13
If it is determined that S (there is key input), step S14
It is determined whether or not the key is a stop key (playback stop key).
If ES, step S15; if NO, step S15
The process has proceeded to step S16. In step S15, the above
Time information T on data read from memory 22
_PLY  Is provided in the backup memory.
Reproduction stop time information (variable for) T_{L AST}(T
_LAST= T_PLY  ), And then strikes in step S17.
A return request is issued (RET I). S
In step S16, other processing is performed and return (RE
TI). By the key input processing, the back
Reproduction stop time information T stored in the up memory_LAST
Are read in step S5 in FIG. 6, and the next step S6
In this time information T_LASTIs valid time information
Is determined. Up when NO in step S6
Proceeding to step S4, reproduction is started from the first song. Stay
YES at step S6 (valid T_LASTIs determined)
If it has been moved to step S7,
2 on the time information T_LASTRecording track corresponding to
Head access control operation to the position or sector position is started.
After the playback operation from the access position is started,
It returns to step S1. Also, YES in step S2 in FIG.
If it is determined that there is a stop request,
Proceed to S8 to mute the reproduction signal or drive the motor.
To shift the system, servo circuit, etc. to the stop mode
The power of each part is turned off in step S9,
The stop mode of step S10 is reached. Step here
Even when the power is turned off in S9, the backup memory
The power is supplied and the stored contents are not
Of course. With the above operation, the resume mode
When the playback mode is selected,
Time information on the data read from the
Is held in the backup memory and the next playback operation is performed.
At this time, the optical disc corresponding to the held time information
Head access control is performed at the position on the
Data reading is started, so playback stopped.
Then, the reproduction is resumed. The present invention is not limited to the above embodiment.
For example, only an optical disk recording / reproducing device
In addition, the present invention can be applied to a control method of a reproduction-only device.
You. [0054] As is apparent from the above description, the present invention
According to the control method of the reproducing apparatus according to the
Data by the optical head driven by the
Intermittently reads data compressed at a first rate
And temporarily store it in the memory, slower than the first speed
The data compressed in the memory at the second speed
By reading the data, expanding the data and playing it back,
Signal being played back and data being read from the optical disc
Control method of a playback device that has a time lag with the
To detect the input of the instruction to interrupt the reproduction of the data.
Step and input of instruction to interrupt playback of the above data are detected
If this happens, stop playback of the above data and
Playback stop time information when playback is stopped from memory
Reading the playback stop time information from the device.
Holding means for retaining the stored contents even when the power is turned off
And turning off the power of the device.
Step, detecting the instruction to resume playback, and
A resume to resume playback from the point where it was interrupted
Detecting that the system mode is set;
It is detected that the resume mode is set
The reproduction stop time held by the holding means
Information on the stop time information of the optical disc based on the information.
Data is read from the corresponding data recording position.
Controlling the head driving means.
Therefore, it is possible to continue playback from the point where it was interrupted.
it can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block circuit diagram illustrating a configuration example of a disk recording / reproducing apparatus to which an embodiment of a reproducing apparatus control method according to the present invention is applied. 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 the embodiment. 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 the embodiment. FIG. 6 is a flowchart illustrating an operation related to a resume function. FIG. 7 is a flowchart illustrating a key input process. [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,
13 data compression encoder, 14, 22 memory, 15 encoder, 16 magnetic head drive circuit, 21 decoder, 23 data expansion decoder, 24 D / A converter, 26 analog audio signal output terminal

Claims (1)

(57) Claims 1. Data intermittently read at a first speed from an optical disk by an optical head driven by a head driving means, and the data is temporarily stored in a memory. By reading out the data compressed data stored in the memory at a second speed lower than the first speed, expanding the data, and then reproducing the data, the signal being reproduced and the data being read out from the optical disk are temporally separated. In the method of controlling a reproducing apparatus having a deviation, a step of detecting an input of an instruction to suspend the reproduction of the data; and a step of stopping the reproduction of the data when an instruction to suspend the reproduction of the data is detected. Reading the reproduction stop time information when the reproduction is stopped from the memory, and reading the reproduction stop time information when the power of the apparatus is turned off. A step of causing the holding means to retain the stored contents, a step of turning off the power of the apparatus, a step of detecting an instruction to restart the reproduction, and a step of restarting the reproduction from the interrupted position of the reproduction. Detecting that the resume mode is set; and, when detecting that the resume mode is set, stopping the optical disc based on the reproduction stop time information held in the holding unit. Controlling the head driving means so that the data is read from the recording position of the data corresponding to the time information.