JP2002140858A - Control method of reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method of a reproducing device such as efficiently realizing the resume function to restart the next reproduction from the position where the reproducing operation is stopped. SOLUTION: Digital data recorded on an optical disk 2 are read out and written into a memory 22, then the reproduction is carried out while performing the read-out control. When the reproduction stopping operation is made by a key input operation part 8 at the time the resume mode is being selected, the time information of read-out data from the memory 22 is stored and held in a back-up memory. When the reproducing operation is made next, the read- out of the data is started from the position on the optical disk 2 based on the time information being held in the back-up memory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method of a reproducing apparatus for reading data from an optical disk on which a digital signal is recorded, writing the data to a memory, and performing reproduction while reading the data.

[0002]

2. Description of the Related Art The applicant of the present invention has previously disclosed a technique for compressing an input digital audio signal into bits and recording the digital audio signal in a burst with a predetermined data amount as a recording unit, for example, as disclosed in Japanese Patent Application No. 2-169977. , Japanese Patent Application No. 2-2136
4, Japanese Patent Application No. 2-221365, Japanese Patent Application No. 2-2228
No. 21, Japanese Patent Application No. 2-282323, drawings and the like.

[0003] This technique uses a magneto-optical disk or the like as a recording medium and uses, for example, AD (adaptive difference) PCM audio data defined in the audio data format of a so-called CD-I (CD-interactive) or CD-ROM XA. Alternatively, digital audio data bit-compressed and encoded according to another format is recorded and reproduced. This bit-compressed digital audio data has a predetermined data amount as a recording unit, and
For example, for every 32 sectors, a connecting sector (linking sector) is added before and after in consideration of interleaving with data of an adjacent sector, and the sector is recorded continuously in a burst (intermittent) manner. .

Here, for example, a so-called straight PC which is obtained by simply linearly quantizing data of a standard CD (compact disk) format (CD-DA format) or an analog audio signal.
Consider a case in which M audio data is recorded and reproduced with approximately 1/4 bit compression. The playback time (play time) of the disc recorded with the bit compression of approximately 1/4 is approximately four times that of recording the straight PCM data before compression, for example, the data of the CD-DA format. Become. This is the standard one for smaller discs
Since the same recording and reproduction time as that of a 2 cm CD can be obtained, the size of the apparatus can be reduced. Also, the (instantaneous) bit rate of recording / reproduction is set to the standard CD-D
By using the same format as the A format, the time required for actually performing recording and reproduction can be reduced to approximately 1/4, so that the remaining approximately 3/4 time can be allocated to so-called retries. it can. Specifically, for example, at the time of data recording, a confirmation (verify) operation of whether or not recording was normally performed, a rewrite operation at the time of not successfully performing recording, and the like.
This is a re-read operation when the error rate of reproduced data is high. Accordingly, recording and reproduction can be performed more reliably even under bad conditions in which the mechanical unit vibrates due to disturbance and focus, tracking, and the like are lost, and application to a small portable device becomes possible.

[0005] In order to record and reproduce such digital audio data that has been bit-compressed by approximately 1/4,
A buffer memory for recording and / or reproducing compressed data is required. In this memory, during recording, compressed data is continuously written at a constant rate, and is read out in bursts or intermittently at approximately four times the speed. One data amount at the time of this burst reading is a predetermined data amount serving as the recording unit, for example, 32 sectors. As described above, several sectors for linking are added before and after, and spatially on the disk. It is recorded continuously (following the previous recording part). At the time of reproduction, the data of the data amount of the predetermined recording unit (for example, 32 sectors + several sectors for linking) is reproduced from the disk at a speed of about 4 times in a burst or intermittent manner. Are written to the buffer memory. The compressed data is continuously read from the memory at the constant rate.

[0006] Here, when the total storage capacity of the buffer memory for the recording and / or reproducing the M _T, the amount of data that is not read yet in the compressed data is written as (unread data volume), the sum of the remaining storage capacity (writable capacity) of the writable memory without destroying the unread data becomes M _T. The control of writing and reading to and from such a memory will be described below.

[0007] During recording, the write controlling the compressed data at a predetermined data rate to said buffer memory, when the unread data volume becomes equal to or greater than the predetermined amount M _K, at a faster readout rate than the write data rate It is controlled so that data is read out in bursts for each predetermined recording unit (for example, 32 sectors + several sectors) and recorded on a recording medium such as a disk. Data not yet recorded on the recording medium is regarded as the unread data on the memory. Here, when the recording operation on the recording medium is interrupted due to disturbances such as vibrations or when recording cannot be performed normally, the amount of unread data in the memory does not decrease, and the amount of unread data in the memory is reduced. when close to the total storage capacity M _T may be the unread data be destroyed by the compressed data written at a constant rate. With this in mind, the writable capacity of the buffer memory _(M T _-M K)
Recording on a recording medium at a stage lower than the above, that is, by providing a margin in the storage capacity of the writable area, the above-described case where the recording on the medium is interrupted or cannot be performed normally. This prevents destruction of unread data. The (M T _{-M K),} assuming the time required for restoration and re-recording or the like of the suspended state of the recording on the medium, may continue to operate for writing compressed data in the memory at the fixed data rate by this time period It should just be set to about.

At the time of reproduction, control is performed so that compressed data read from a recording medium in a burst manner is written to a memory and read at a constant data rate. At this time, the amount of unread data in the memory is reduced. a predetermined amount _{M L}
When the value is less than the threshold value, control is performed such that data is read out from the recording medium in a burst manner and written into the memory. This is because even if data reading from a recording medium such as a disc cannot be performed normally due to disturbance or the like, the remaining unread data amount M
_L can be read continuously, so that the read operation at a constant rate is not interrupted and the reproduction is not interrupted. The unread data volume M _L, for example a compressed data at the time an amount corresponding to the predetermined rate required for reading the recorded data again to the recording medium may be set to a degree that may continue operation of reading from the memory.

[0009]

In a general so-called CD (compact disk) player,
A pause function for temporarily stopping the playback operation, a song selection playback function for selecting and playing a desired song, a one song / all song repeat function for repeatedly playing one song or all songs on the disc, and a B from an arbitrary point A A / B to repeat playback up to point
A repeat function is added. In addition to digital audio signals, so-called CD-ROMs
In some cases, a so-called resume function is provided to enable the reproduction to be resumed from the same position after the reproduction has been interrupted, including the case where the data is used for recording and reproduction of general data, as in the case of. By using these functions, not only can the operation time be saved, but also how to enjoy the audio can be expanded.

When such a function is to be added to the above-mentioned compressed data recording / reproducing apparatus or reproduction-only apparatus, particularly when the above-mentioned resume function is to be realized, the above-mentioned buffer memory for reproduction is used. Therefore, there is a time lag between the signal currently being reproduced and the signal being read from the disk, and it is difficult to start the reproduction at the time of the above-mentioned resumption so as to continue from the signal at the time when the reproduction was interrupted. . It is desirable that the configuration for adding such a function be simple. The present invention has been made in view of such circumstances, and has as its object to provide a control method of an optical disk reproducing apparatus that can realize the so-called resume function with a simple configuration.

[0011]

A control method of a reproducing apparatus according to the present invention is a method of intermittently reading data compressed from an optical disk by an optical head driven by a head driving means at a first speed to a memory. Once, and reads out the data compressed in the memory at a second speed lower than the first speed, expands the data, and reproduces the data. Detecting the input of an instruction to suspend reproduction of the data, and detecting the input of an instruction to suspend reproduction of the data, Stopping reproduction of data and reading reproduction stop time information when the reproduction was stopped from the memory; A step of storing contents to be held in the holding means to be retained even when power shutdown of the device,
Shutting down the power of the apparatus, detecting an instruction to resume reproduction, detecting that a resume mode for resuming reproduction from an interrupted position is set, When it is detected that the mode is set, the data is read from the recording position of the data corresponding to the stop time information on the optical disc based on the reproduction stop time information held in the holding means. And a step of controlling the head driving means.

[0012]

The address information of the data read from the memory is stored in the backup storage means, and when the reproducing operation is resumed, the optical disk is accessed based on the backed up address information, and the address corresponding to the address information is obtained. Since the recorded data is read from the disk position, and the reproduction is performed while controlling the writing and the reading to the memory, the reproduction is continuously performed from the interrupted contents.

[0013]

FIG. 1 is a block circuit diagram showing a schematic configuration of an optical disk recording / reproducing apparatus to which an embodiment of a reproducing apparatus control method according to the present invention is applied.

In FIG. 1, a bit-compressed digital audio signal is recorded on a recording medium such as an optical disk 2. This recording signal is read in bursts by a predetermined recording unit (for example, 32 sectors + several sectors) by the optical head 3, and bit-compressed audio data is obtained via a decoder 21 for descrambling and error correction decoding. The compressed data is written to a memory 22 such as a RAM (random access memory), read from the memory 22 at a constant data rate, and a decoder 23 for restoring (expanding) and decoding the bit compression processing on the recording side is used. The reproduction of the audio signal is carried out via this.

Here, the writing operation of the compressed data to the memory 22 is controlled by reading the compressed data from the recording medium such as the optical disk 2 when the data amount in the memory 22 becomes a certain amount or less. While the data is continually read and written while the free area in which data can be written remains in the memory 22, but when the free area becomes less than a certain value and the writing becomes impossible, that is, when the memory is substantially full. Then, reading from the recording medium is stopped, and for example, control is performed so that the optical head 3 keeps tracing the same track position on the optical disk 2 or enters a standby state near a position to be read next.

A CPU (central processing unit) used as the system controller 7 has an RO
M and RAM, and at least the contents stored in the RAM are backed up even when the main power supply is cut off (power off) by a backup power supply such as a battery. Instead of the main power supply cutoff mode, a standby mode may be provided in which only the operation power supply of the disk drive motor and the servo circuit is turned off, and the CPU and the like may be kept on during this time. Alternatively, a low power consumption type memory may be separately provided for backup storage, and only this backup memory may be continuously backed up when the power is turned off.

In the apparatus having at least such a configuration, the key input operation unit 8 first switches and selects a so-called resume mode or another normal mode. When the switching to the resume mode is selected, even if the playback operation is stopped by operating the playback stop button or the power-off button, if the playback mode is switched again and selected again, the content at the time when the playback is stopped is returned. Then, the reproduction is resumed.

In order to realize this resume function,
Time information about the data read from the memory 22 is stored in the backup memory. As the time information of the read data, when data is written in the memory 22 including the so-called header time in the disk recording data, the time information such as the header time read from the memory 22 is used as it is. . When the header time or the like is not written in the memory 22, the time information such as the header time of the data written in the memory 22 and the address difference between the write pointer and the read pointer for the memory 22 (specifically, for example, the time difference) 2) Time information obtained by calculating a time corresponding to the read data from the information is used. It is sufficient that at least the time information corresponding to the read data be written into the backup memory when the reproduction stop button is operated, but during the reproduction operation, the time information is always stored in the register in the system controller 7 or the backup memory. The writing may be continued, and the actual playback time or the like may be calculated based on the written time information and displayed on the display unit 9. When the playback stop button or the power off button is operated, the main power sources such as the motor drive system, the optical head drive system, the servo circuit system, and the audio signal playback system are turned off, and the playback operation is stopped. A transition is made to a so-called sleep mode, standby mode, or power-off mode in which only the backup memory, the vicinity of the system controller 7, and the power supply of the CPU or the like are alive as required. During this time, the time information (time information of the memory read data at the time of stopping reproduction) stored in the backup memory is held.

Next, when the reproduction mode selection button of the key input operation unit 8 is operated, the system controller 7 accesses the optical head 3 from the backup memory based on the time information of the memory read data at the time of the reproduction stop. Under the control, the recording data is read from a position corresponding to the time information on the optical disk 2 and written into the memory 22, and the data read from the memory 22 is reproduced. Therefore, the reproduction is resumed from the contents interrupted when the reproduction is stopped. This is because when the time information of the data written to the memory 22 is used, there is a time delay until the reading of the data written to the memory 22 is completed at the time of the reproduction stop operation, or the reproduction is restarted when the reproduction is immediately stopped. In such a case, it is possible to avoid a problem that the continuity of the content cannot be maintained when it is performed.

Hereinafter, the specific configuration shown in FIG. 1 will be described in detail. As the optical disk 2 driven to rotate by the spindle motor 1, a recordable, for example, a magneto-optical disk is used. However, in the case of playback only,
An aluminum reflective film type optical disk similar to a normal CD (compact disk) can also be used. An optical head 3 for performing recording and / or reproduction on the optical disc (for example, a magneto-optical disc) 2 includes, for example, a laser light source such as a laser diode, and an optical head such as a collimator lens, an objective lens, a polarizing beam splitter, and a cylindrical lens. It is composed of components and a photodetector having a light receiving section of a predetermined pattern. The optical head 3 is connected to the magnetic head 4 via the magneto-optical disk 2.
Is provided at a position opposite to the above. When data is recorded on the magneto-optical disk 2, the magnetic head 4 is driven by a recording-system head drive circuit 16, which will be described later, to apply a modulation magnetic field according to the recorded data. By irradiating the track with laser light, thermomagnetic recording is performed by a magnetic field modulation method.
The optical head 3 detects reflected light of the laser beam applied to the target track, detects a focus error by, for example, a so-called astigmatism method, and detects a tracking error by, for example, a so-called push-pull method. When reproducing data from the magneto-optical disk 2, the optical head 3 detects the focus error and the tracking error, and at the same time, detects the difference in the polarization angle (Kerr rotation angle) of the reflected light of the laser light from the target track and reproduces the data. Generate a signal.

The output of the optical head 3 is supplied to an RF circuit 5. The RF circuit 5 extracts the focus error signal and the tracking error signal from the output of the optical head 3 and supplies the focus error signal and the tracking error signal to the servo control circuit 6 and binarizes the reproduction signal and supplies it to a reproduction system decoder 21 described later. .

The servo control circuit 6 comprises, for example, a focus servo control circuit, a tracking servo control circuit, a spindle motor servo control circuit, a thread servo control circuit and the like. The focus servo control circuit performs focus control of the optical system of the optical head 3 so that the focus error signal becomes zero. Further, the tracking servo control circuit performs tracking control of the optical system of the optical head 3 so that the tracking error signal becomes zero. Further, the spindle motor servo control circuit controls the spindle motor 1 so as to rotate the magneto-optical disk 2 at a predetermined rotation speed (for example, a constant linear speed). Further, the thread servo control circuit moves the optical head 3 and the magnetic head 4 to target track positions of the magneto-optical disk 2 designated by the system controller 7. The servo control circuit 6 that performs such various control operations supplies information indicating the operation state of each unit controlled by the servo control circuit 6 to the system controller 7.

A key input operation unit 8 and a display unit 9 are connected to the system controller 7. The system controller 7 controls a recording system and a reproduction system in an operation mode specified by operation input information from the key input operation unit 8. In the key input operation unit 8, a switch button for selecting the resume mode is provided. The system controller 7 traces the optical head 3 and the magnetic head 4 based on address information (time information) in sector units reproduced from a recording track of the magneto-optical disk 2 by a header time, Q data of a subcode, or the like. Recording position and reproduction position on the recording track. The display unit 9 displays information on the recording position or the reproduction position, information on the function selected by the key operation, and the like as necessary. Here, for example, a built-in RAM of a CPU used for the system controller 7 or a separate low power consumption type RA
M and the like are used as backup memories. When the backup memory is switched to the resume mode at least, the time information on the data to be read from the memory 22 is taken into consideration in consideration of the difference between the time information of the data to be written to the memory 22 and the time information of the data to be read. Written. Then, even if the reproduction operation is stopped, power is continuously supplied to the backup memory, and the stored contents are retained. The operation of the resume function using this backup memory will be described later.

Next, a recording system of the disk recording / reproducing apparatus will be described. Analog audio input signal _{A IN} from the input terminal 10 via a low-pass filter 11 A /
It is supplied to a D converter 12. The A / D converter 12 quantizes the analog audio input signal _AIN, and converts the obtained digital audio signal into an encoder 1 for high-efficiency encoding such as AD (adaptive difference) PCM.
3 is supplied. Further, an external digital audio signal may be supplied to the encoder 13 via a digital input interface circuit (not shown). The digital audio PCM signal input to the encoder 13 is so-called straight PCM data that has not been subjected to compression processing or the like. As a specific example, a standard CD (compact disk) format (C
Similarly to the D-DA format, a PC having a sampling frequency of 44.1 kHz and a quantization bit number of 16 bits is used.
Let it be M data. The input audio PCM data is subjected to a high-efficiency bit compression process by the encoder 13 such that the bit rate becomes, for example, approximately 1/4.

Next, the memory 14 is controlled by the system controller 7 to write and read data. The memory 14 temporarily stores bit-compressed data supplied from the encoder 13 and records it on a disk as necessary. Is used as a buffer memory. That is, for example, in the 1/4 bit compression mode, compressed data of a constant bit rate reduced to approximately 1/4 of the data transfer rate (bit rate) of the standard CD-DA format is continuously stored in the memory 14. Is written. When this compressed data is recorded on the magneto-optical disk 2, it is recorded in a burst or discrete manner at the same data transfer speed under the same disk rotation speed (constant linear speed) as the standard CD-DA format. I have. In other words, the time during which the signal is actually recorded in the recording mode is approximately 1
/ 4, and the remaining 3/4 of the time is a pause period during which recording is not performed. However, on the magneto-optical disk 2, the next recording is performed following the area recorded immediately before the pause period, and continuous recording is performed on the medium surface. As a result, for example, recording of the same recording density and storage pattern as in the standard CD-DA format is performed.

For this reason, the compressed data is read from the memory 14 in a burst at a bit rate corresponding to the data transfer rate of the standard CD-DA format.
The read compressed data is supplied to an encoder 15 for performing an interleaving process, an error correction coding process, an EFM modulation process, and the like. Here, in the data string supplied from the memory 14 to the encoder 15, one cluster composed of a predetermined plurality of sectors (for example, 32 sectors) is a unit that is continuously recorded in one recording, and when this is encoded, The data amount is obtained by adding several sectors for cluster connection to the data amount for one cluster. The cluster connection sector is set to be longer than the interleave length in the encoder 15 so that even if interleaved, data in other clusters is not affected. Details of the recording in cluster units will be described later with reference to FIG.

The encoder 15 converts the recording data supplied from the memory 14 in a burst
Encoding processing (parity addition and interleaving processing) for error correction, EFM encoding processing, and the like are performed. The recording data that has been subjected to the encoding process by the encoder 15 is supplied to the magnetic head drive circuit 16. The magnetic head drive circuit 16 is connected to the magnetic head 4,
The magnetic head 4 is driven so that a modulation magnetic field corresponding to the recording data is applied to the magneto-optical disk 2.

The system controller 7 performs the above-described memory control of the memory 14 and continuously records the recording data read from the memory 14 in a burst on the recording track of the magneto-optical disk 2 by the memory control. The recording position is controlled so that The recording position is controlled by controlling the recording position of the recording data read out from the memory 14 in a burst manner by the system controller 7 and transmitting a control signal designating the recording position on the recording track of the magneto-optical disk 2 to a servo control circuit. 6
Is performed by supplying the Next, a reproducing system of the disk recording / reproducing apparatus will be described. This reproducing system is for reproducing the recorded data continuously recorded on the recording tracks of the magneto-optical disk 2 by the above-mentioned recording system. The recording signal is read from the magneto-optical disk 2 by tracing. here,
The magneto-optical disk 2 is driven to rotate at the same rotational speed (constant linear speed) as the standard CD-DA format, and the recording signal is burst-like (discrete) at the same data transfer speed as the CD-DA format. Is read, binarized by the RF amplifier circuit 5, and supplied to the decoder 21.

The decoder 21 corresponds to the encoder 15 in the recording system described above, and performs a deinterleaving process, a decoding process for error correction, and an EFM demodulation on the reproduced output binarized by the RF circuit 5. Processing such as processing is performed, and the above-mentioned quarter-compressed data is output in a burst at the same data transfer rate as, for example, the standard CD-DA format. The reproduction data obtained by the decoder 21 is supplied to the memory 22.

In the memory 22, writing and reading of data are controlled by the system controller 7, and reproduced data supplied from the decoder 21 in bursts at the same data transfer rate as the standard CD-DA format is written. In addition, in the memory 22, the reproduction data written in a burst is continuously read at a constant bit rate, that is, at a data transfer speed of approximately 1/4 of the standard CD-DA format.

The system controller 7 performs memory control of writing / reading of the reproduction data to / from the memory 22, and reproduces the reproduction data written in a burst from the memory 22 by the memory control. The playback position is controlled so as to continuously play back from the recording track. The reproduction position is controlled by controlling the reproduction position of the reproduction data read in a burst from the memory 22 by the system controller 7 and transmitting a control signal designating the reproduction position on the recording track of the magneto-optical disk 2 to a servo control circuit. 6.

Compressed data obtained as reproduction data continuously read from the memory 22 at a transfer rate (bit rate) of approximately the standard 標準 is supplied to a decoder 23. The decoder 23 corresponds to the encoder 13 of the recording system. For example, the decoder 23 expands the compressed data of 1/4 by, for example, 4 times (bit expansion) to obtain 1 data.
6-bit digital audio data is reproduced. The digital audio data from the decoder 23 is
It is supplied to the D / A converter 24.

The D / A converter 24 converts the digital audio data supplied from the decoder 23 into an analog signal, and outputs an analog audio output signal _AOUT from an output terminal 26 via a low-pass filter 25.

The magneto-optical disk 2 used in such a disk recording / reproducing apparatus preferably has a capacity capable of recording a stereo audio signal for about 60 minutes to about 74 minutes. When employing a compression ratio, 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.
It is desirable to use a disk of m or smaller diameter. Further, the track pitch and the linear velocity are the same as those of the CD, that is, the track pitch is 1.6 μm and the linear velocity is 1.
It is desired to be 2 to 1.4 m / s. As a disk satisfying these conditions, for example, a disk having an outer diameter of 6
4 mm, the outer diameter of the data recording area is 61 mm, the inner diameter of the data recording area is 32 mm, the inner diameter of the lead-in area is 30 mm,
The center hole diameter may be 10 mm. If this disc is stored in a disc caddy measuring 70 mm × 74 mm in length and width and supplied to the market, recording and reproduction on the disc can be performed by a recording / reproducing apparatus having a pocket size. In addition, 72 minutes or more in the above 1/4 data compression mode
The range of the inner diameter and outer diameter of the data recording area of the disk for enabling recording and reproduction for about 76 minutes is from an outer diameter of 60 mm to 62 mm when the inner diameter is 32 mm and from an outer diameter of 50 mm when the inner diameter is 50 mm. What is necessary is just to set suitably in the range of 71 mm-73 mm in outer diameter.

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.

By performing such cluster unit recording, it is not necessary to consider mutual interference due to interleaving with other clusters, and data processing is greatly simplified. Also, if the recording data cannot be recorded normally at the time of recording due to defocus, tracking deviation, other malfunction, etc., re-recording can be performed in cluster units, and if effective data reading cannot be performed during reproduction, Re-reading can be performed in cluster units.

One sector (block) is 235.
23 bytes consisting of 2 bytes, 12 bytes for synchronization, 4 bytes for header, and data D0001 to D2336 from the beginning.
36 bytes are arranged in this order. Of the 12 bytes for synchronization in the sector structure (block structure), the first 1 byte is 00H (H indicates a hexadecimal number), followed by 10 bytes of FFH, and the last 1 byte is 00H. The next 4-byte header is composed of one byte for mode information, following the minute, second, and block address portions of one byte each. This mode information is mainly for indicating the mode of the CD-ROM, and the internal structure of the sector shown in FIG. 2 corresponds to the mode 2 of the CD-ROM format. CD-I is a standard using this mode 2.

In the specific example of FIG. 2, a format for recording compressed audio data is further shown. From the beginning of the 2336-byte area, an 8-byte sub-header, 128 bytes each, and 18 groups of sound groups SG01 to SG01 are provided. SG18, a 20-byte space area, and a 4-byte reserved area are arranged in this order. 8 above
The byte subheader has a file number, a channel number, a submode, and a data type of 1 byte, which are arranged twice.

When data having such a sector structure is recorded on a disk, the encoder 15 performs an encoding process including a parity addition and an interleave process, and performs an EFM (8-14 modulation) process. FIG. 3
Recording is performed in a recording format as shown in FIG.

In FIG. 3, one block (one sector) is composed of 98 frames from the first frame to the 98th frame, and one frame has a channel clock period T
588 times (588T) of the frame synchronization pattern part of 24T (+3 connection bits) in one frame, 14T
A (+ connection bit 3T) subcode portion and a 544T data (audio data and parity data) portion are provided. The data portion of 544T is so-called EFM-modulated 12-byte (12-symbol) audio data, 4-byte parity data, 12-byte audio data, and 4-byte parity data, and audio data in one frame. Is 24 bytes (that is, one word of audio sample data is 16 bytes).
12 words). The sub-code part is obtained by subjecting 8-bit sub-code data to EFM modulation, and is divided into blocks of 98 frames, and each bit forms eight sub-code channels P to W. However, the subcode portions of the first and second frames are block synchronization patterns S _{0 and} S ₁ outside the rules of the EFM modulation (out-of-rule), and the subcode channels P to W are shifted from the third frame to the third frame. It is 96 bits each for up to 98 frames.

The above-mentioned audio data is recorded after being subjected to an interleaving process. At the time of reproduction, the audio data is subjected to a de-interleaving process so as to be audio data having a data arrangement in a time order. Instead of this audio data,
General CD-I data and the like can be recorded.

In the disk recording / reproducing apparatus shown in FIG. 1, the system controller 7 continuously increments the write pointer W of the memory 14 at a speed corresponding to the bit rate of the compressed data, as shown in FIG. continuously writing Te, the unread data volume of the compressed data stored in the memory 14 becomes equal to or larger than a predetermined amount M _K, pursuant read pointer R of the memory 14 in the standard CD-DA format The memory control is performed such that the data is incremented in a burst at the transfer speed and read out in predetermined recording units (for example, 32 sectors). Therefore, in the memory 14, the data amount that can be written without destroying the unread data, that is, the recordable capacity is:
It will be prevented below a predetermined amount _(M T -M _K).

Here, the recording data read from the memory 14 in a burst manner is continuously recorded on the recording track of the magneto-optical disk 2 by controlling the recording position on the recording track of the magneto-optical disk 2 by the system controller 7. The status can be recorded. Further, as described above, since a data write area of a predetermined amount or more is always secured in the memory 14, the system controller 7 detects that a track jump or the like has occurred due to disturbance or the like, and performs a recording operation on the magneto-optical disk 2. Even when the recording is interrupted, the input data is continuously written in the recordable area of the predetermined amount or more, and the return processing operation can be performed during that time, and the input data is continuously recorded on the recording track of the magneto-optical disk 2. The status can be recorded.

Note that, on the magneto-optical disk 2, header time data and the like corresponding to the physical address of the sector are added to the digital audio compression data for each sector and recorded. In addition, catalog data indicating the recording area and the recording mode is recorded in a catalog area such as a TOC area.

Next, in the reproducing system of the disk recording / reproducing apparatus shown in FIG. 1, the system controller 7 sets the write pointer W of the memory 22 to a standard CD as shown in FIG.
-While incrementing at a transfer rate in accordance with the DA format and writing in a burst, the read pointer R of the memory 22 is continuously incremented and read at a rate corresponding to the bit rate of the compressed data. It stops writing when caught up with the read pointer R (writable area becomes zero), so that the unread data amount stored in the memory 22 writes the equal to or less than a predetermined amount M _L Perform memory control. Accordingly, while ensuring a data read area always a predetermined amount M _L or more unread data volume in the memory 22 can be read continuously reproduced data from the memory 22.

The reproduction data written in a burst to the memory 22 is reproduced in a continuous state on the recording tracks of the magneto-optical disk 2 by controlling the reproduction position on the recording tracks of the magneto-optical disk 2 by the system controller 7. can do. Moreover, since always a predetermined amount M _L or more data read area in the memory 22 as described above is secured, with respect to the optical disk 2 to detect that the track jump or the like occurs due to disturbances such as the system controller 7 even when the interrupting playback operation, it is possible to continue the output of the analog audio signal by reading the playback data from the predetermined amount M _L or more data read area, it is possible to perform the return processing operations in the meantime.

Next, a specific example of the operation when the resume mode as described above is selected by the key input operation unit 8 and the reproduction stop operation and the subsequent reproduction restart operation are performed will be described with reference to FIGS. 6 and 7. This will be described with reference to FIG.

FIG. 6 shows a main routine when a reproduction mode switching selection operation is performed.
After the normal processing is performed in step 1, it is determined in step S2 whether a stop (reproduction stop) request has been issued. When NO is determined in this step S2 (no stop request is made), the flow proceeds to step S3 to determine whether or not the resume mode is set, and when NO, the flow proceeds to step S4 to perform a reproduction operation from the first music on the disk. Is started. If YES in step S3 (in the resume mode), the process proceeds to step S5, where the time information T at the time of stopping reproduction from the backup memory is read.
_{Read LAST} . The time information T _LAST will be described with reference to FIG.

FIG. 7 shows a part of the key input processing operation by the timer interrupt. In response to the timer interrupt of a fixed time period, after the normal processing is performed in step S11, the key input scan and the key input scan are performed in step S12. Input key determination processing is performed. At the next step S13, it is determined whether or not a key input has been made. If NO (no key input), the process returns from the interrupt routine to the original main routine (RETI). 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).
In the case of ES, the process proceeds to step S15, and in the case of NO, the process proceeds to step S16. In step S15, the time information T for the data read from the memory 22 is read.
_PLY is stored in reproduction stop time information (variable for use) T _{L AST} provided in the backup memory (T _{L AST} ).
_{After LAST} = _TPLY , a stop request is issued in step S17 and the process returns (RET I). In step S16, other processing is performed and return (RE
TI).

By such key input processing, the reproduction stop time information T _LAST stored in the backup memory is stored.
Are read in step S5 in FIG. 6, and the next step S6
Then, it is determined whether or not the time information T _LAST is valid time information. If NO in step S6, the process proceeds to step S4, and reproduction is started from the first music. If YES (a valid T _LAST ) is determined in step S6, the flow advances to step S7 to perform a head access control operation on the magneto-optical disk 2 to a recording track position or a sector position corresponding to the time information T _LAST. After the start and the reproduction operation from the access position are started, the process returns to the step S1.

Also, YES in step S2 in FIG.
If it is determined that there is a (stop request), the process proceeds to step S8 to perform an operation for muting the reproduction signal or shifting the motor drive system, the servo circuit system, and the like to the stop mode. Is turned off to reach the stop mode of step S10. Here, even when the power is turned off in step S9, the power is supplied to the backup memory, and the stored contents are of course retained.

By the operation described above, when the resume mode is selected, the time information about the data read from the memory 22 at the time of the reproduction stop operation is held in the backup memory, and the next time the reproduction operation is performed, Since the head access control is performed on the position on the optical disk corresponding to the held time information and the reading of the recorded data is started, the reproduction is resumed from the point where the reproduction was stopped. .

It should be noted that the present invention is not limited to only the above-described embodiment. For example, the present invention can be applied not only to an optical disk recording / reproducing apparatus but also to a control method for a reproduction-only apparatus.

[0054]

As is apparent from the above description, according to the control method of the reproducing apparatus of the present invention, the data compressed from the optical disk by the optical head driven by the head driving means is transferred at the first speed. The data is read out intermittently and temporarily stored in a memory, and the data compressed in the memory is read out at a second speed lower than the first speed, and the data is decompressed and reproduced. A step of detecting an input of an instruction to suspend reproduction of the data, and a step of detecting an input of an instruction to suspend reproduction of the data; Detecting the reproduction stop time information when the reproduction is stopped from the memory when the reproduction is stopped. A step of holding the playback stop time information in a holding unit whose stored content is held even when the power of the apparatus is shut off, a step of shutting off the power of the apparatus, and a step of detecting an instruction to restart playback. Detecting that a resume mode for resuming playback from the interrupted position is set; and
When it is detected that the resume mode is set, data is read from the recording position of the data corresponding to the stop time information on the optical disc based on the reproduction stop time information held in the holding means. Since the method includes the step of controlling the head driving means as described above, the reproduction can be performed continuously from the content of the place where the recording was interrupted.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing a configuration example of a disc 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 which is a unit of recording 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.

[Explanation of symbols]

2 magneto-optical disk, 3 optical head, 4 magnetic head, 6 servo control circuit, 7 system controller, 10 analog audio signal input terminal,
Reference Signs List 13 encoder for data compression, 14, 22 memory, 15 encoder, 16 magnetic head drive circuit, 21 decoder, 23 decoder for data decompression, 24 D / A converter, 26 analog audio signal output terminal

Claims (1)

[Claims] 1. An intermittent reading of data compressed from an optical disk by an optical head driven by a head driving means at a first speed, temporarily storing the data in a memory, and a second speed lower than the first speed. A method for controlling a reproducing apparatus in which there is a time lag between a signal being reproduced and data being read from the optical disc by reading out the data compressed in the memory stored in the memory at a predetermined speed, and expanding and reproducing the data. Detecting an input of an instruction to interrupt the reproduction of the data, and, when an instruction to interrupt the reproduction of the data is detected, stopping the reproduction of the data and stopping the reproduction from the memory. Reading the reproduction stop time information when the reproduction stop time information is stored even when the power of the apparatus is turned off. A step of turning off the power of the apparatus, a step of detecting an instruction to resume reproduction, and a resume mode for resuming reproduction from a position where reproduction is interrupted. Detecting that the resume mode has been set. If the resume mode is detected, the data corresponding to the stop time information of the optical disc is determined based on the reproduction stop time information held by the holding means. Controlling the head driving means so that the data is read from the recording position.