JPH0822674A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To record and reproduce data of three channels or more independently of each channel and to perform it simultaneously and in parallel. CONSTITUTION:Sound compression/expansion section 121-124, D/A converters 131-134, and A/D converters 151-154 are respectively provided independently of each channel so that signals of four independent channels CH1-4 can be handled, in a reproducing system and a recording system, in this device. Since recording and reproducing operation of each channel are performed with compression data, recording and reproducing of four channels can be performed in one cycle. Since data of each channel is also recorded with a minimum recording unit, only tracking may be required for a channel in which reproducing or recording is not performed, therefore, a time for searching can be shortened, and sufficient time can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc recording / reproducing apparatus capable of recording / reproducing using a small-sized magneto-optical disc such as a so-called mini disc (MD), and more particularly to various disc recording / reproducing devices utilizing many channels. The present invention relates to a disc recording / reproducing device that realizes editing.

[0002]

2. Description of the Related Art As a disk recording / reproducing apparatus of this type, a recording / reproducing apparatus using an MD has been conventionally known. M
In D, by adopting a sampling method similar to that of a compact disc (CD) and adopting a new audio compression / expansion method, it is possible to realize high sound quality comparable to that of a CD with an information amount of about 1/5 that of a CD. .

Since an MD capable of recording / reproducing uses a magneto-optical disk, an MD player using the MD is equipped with an optical head for recording / reproducing and a magnetic head used at the time of recording. ing. Then, during a normal operation, the user selectively selects a reproduction mode for reading reproduction data from the disc and a recording mode for writing recording data on the disc.

The MD player allows recording and reproducing of 2-channel data due to the data format.
It is not possible to record / reproduce data with more channels. Therefore, in Japanese Patent Laid-Open No. 5-274792,
A disc recording / reproducing apparatus in which data of the first and second channels and data of the third and fourth channels are recorded in different areas or alternately and the data of a plurality of systems are processed in parallel. Is proposed.

[0005]

However, the above-mentioned conventional disc recording / reproducing apparatus has the following problems. That is, as shown in FIG. 7, when data of a plurality of channels are recorded in different areas, each area is searched in order to output the reproduced sound of four channels at the same time.
Since it is temporarily stored in the buffer memory and is output at the same time, the amount of movement of the pickup between each channel is large, and it is not possible to search only by the track kick of the pickup, and because feed feed is involved, the search time is long and the head The load on the moving mechanism is also heavy. In addition, in order to compensate for the disadvantage that the search time becomes long, there is a problem that the capacity of the buffer memory becomes large.

On the other hand, when data of a plurality of channels are recorded alternately, the above-mentioned problem does not occur, but a problem occurs depending on how long each data is recorded. For example, considering an edit mode in which a recorded signal is being reproduced, the reproduced sound is subjected to an editing process, and recording is performed again at the same address, it is desired that each channel can be independently recorded or reproduced. However, as shown in FIG.
If the data length of each channel is shorter than one recording unit (cluster), the data of all channels must be rewritten even in the recording operation for a specific channel.

The present invention has been made in consideration of such a point, and in a disk recording / reproducing apparatus for recording / reproducing a disk as a medium, recording and reproducing of data of three or more channels are independent for each channel. It is an object of the present invention to provide a disk recording / reproducing apparatus that can be executed in parallel by processing, has a short search time, and has a small load on a head mechanism.

[0008]

DISCLOSURE OF THE INVENTION A disk recording / reproducing apparatus according to the present invention reads data compressed and recorded on a recordable disk from the disk and stores the read data in a storage means at a first speed. While writing intermittently, the read data written in the storage means is written in the first data.
Reproducing means for reading the data continuously at a second speed slower than the above speed, decompressing the data, and outputting it as a reproduction signal;
While the signal to be recorded is data-compressed and written in the storage means at the second speed without interruption, the written compressed data is intermittently read from the storage means at the first speed and recorded on the disk. In a disc recording / reproducing apparatus including a recording means, a system for reading out read data written in the storage means without interruption, decompressing the data, and outputting as a reproduction signal, and compressing the signal to be recorded and storing the same A system for continuously writing to the means is provided in parallel for a plurality of channels, and data of a plurality of channels is repeatedly recorded in order on the disc,
The length of the recording data of each channel is set to the minimum recording unit recorded by one disk access, and the data of each channel to be reproduced on the disc is output during the reproduction signal of the minimum recording unit. Read and write to the storage means at the first speed, and read data of each channel to be recorded from the storage means and write to the disk at the first speed in time division for each channel. And a control means for executing the continuous read operation of the read data from the storage means and the continuous write operation of the compressed data to the storage means simultaneously in parallel for each channel. Characterize.

[0009]

According to the present invention, the data of each channel is continuously recorded on the disc by the minimum recording unit, so that the data can be independently recorded or reproduced for each channel. Since the recording and reproducing operation of each channel is performed with compressed data, if the output period of the reproducing signal of one reproducing channel is one cycle, this 1
It is possible to perform recording and reproduction of multiple channels in a cycle. Since the data of each channel is recorded in the minimum recording unit, a track kick may be performed for a channel that is not reproduced or recorded, and a second or subsequent new search is necessary for a channel that is continuously reproduced or recorded. do not do. Therefore, the search time can be shortened and a sufficient time margin can be secured.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an MD player according to an embodiment of the present invention. The MD type disc 1 is a magneto-optical disc capable of recording and reproduction. The disk 1 is rotationally driven by a spindle motor 2 at a constant linear velocity, for example. A magnetic recording head 3 and an optical pickup 4 are arranged above and below the disk 1 with the disk 1 in between. The magnetic recording head 3 applies a magnetic field to the disk 1 when writing information on the disk 1. The optical pickup 4 has a function of optically reading information from the disk 1 and a function of writing information on the disk 1 in cooperation with the magnetic recording head 3. Optical pickup 4
Can be moved in the radial direction of the disk 1 by the feed motor 5. The read output of the optical pickup 4 is amplified by the radio frequency (RF) amplifier 6 and supplied to the servo control unit 7. The servo control unit 7 controls the rotation of the spindle motor 2 and the feed motor 5 based on the pickup output.
And the focus / tracking control of the pickup 3 are executed.

The reproducing system of this MD player is constructed as follows. That is, the output of the RF amplifier 6 is the EFM.
It is also supplied to (eight to fourteen modulation) encoder / decoder 8, where ACIRC (Advanced cross
The data is decoded by an error correction method based on interleave Reed-Solomon code), demodulated from 14-bit data to 8-bit data, and stored in the buffer memory 10 under the control of the memory controller 9. The reproduction address at that time is given by the address decoder 11 decoding the output of the RF amplifier 6. Memory 1
The data stored in 0 is appropriately read by the memory controller 9, expanded by the audio compression / expansion unit 12, D / A converted by the D / A converter 13, and output as a reproduced audio output signal.

On the other hand, the recording system of this MD player is constructed as follows. That is, the audio input signal to be recorded is supplied to the analog mixer 14, where D
A after being properly combined with the reproduction signal from the A / A converter 13
A / D converter 15 performs A / D conversion, and audio compression / decompression unit 1
2 is supplied. The data supplied to the audio compression / decompression unit 12 is compressed here and then stored in the memory 10 under the control of the memory controller 9. The data to be recorded stored in the memory 10 is supplied to the EFM encoder / decoder 8 under the control of the memory controller 9, is EFM-modulated and ACIRC encoded, and is then supplied to the head drive unit 16. The recording head 3 is
It is driven by the head drive unit 16 to record necessary data on the disk 1.

In this MD player, the audio compression / expansion unit 1 is provided so that the signals of four independent channels can be handled in the reproduction system and the recording system.
21 to 124, D / A converters 131 to 134 and A / D
The converters 151 to 154 are provided independently for each channel, and recording and reproduction can be selected for each channel. The memory controller 9 also includes audio compression / decompression units 121 to 12 for each channel.
4 have input / output terminals, and these terminals are set to a mode for transferring the data in the memory 10 to the audio compression / decompression unit 12 for each channel or a mode for storing the data from the audio compression / decompression unit 12 in the memory 10. Can be set. The data transfer for each channel is performed in real time by time sharing.

In addition to this, the MD player also has a system controller 17 for controlling the entire system, a display section 18 for displaying various information, a mode designation such as a reproduction mode, a recording mode, and an editing mode, and various types of information. A plurality of operation keys 19 for giving instructions are provided.

In the MD player configured as described above, the audio compression performed by the audio compression unit 17 is performed by thinning out unnecessary data by utilizing human auditory perception characteristics.
For example, ATRAC (Adaptive Transform Acoustic Codi
In the compression technique called "ng)", information compression of about 1/5 is realized by utilizing the human minimum audibility limit characteristic and the masking effect. In this way, the data recorded on the disc 1 is
Since the data is compressed, the disc 1 is used for continuously supplied recording signals or continuously output reproduced signals.
Access to is an intermittent operation. For this reason, this MD player is provided with the buffer memory 10 for matching the two. The buffer memory 10 also has a shockproof function.

In the reproducing mode, the data compressed and recorded on the disc 1 is intermittently read from the disc 1 and the read data is intermittently written to the buffer memory 10 at a speed of 1.4 Mb / s, for example. The read data written in the memory 10 is, for example, 0.3 Mb /
The data is read out without interruption at the speed of s, data is expanded, and then output as a reproduction signal. On the other hand, in the recording mode, while the signal to be recorded is compressed and written in the buffer memory 10 at a rate of 0.3 Mb / s without interruption, the written compressed data is written at a rate of 1.4 Mb / s in the memory 10. The data is intermittently read from the disk and recorded on the disk 1 intermittently.

By the way, in the MD player, 512 samples of the left and right channels (512 × 16 × 2/8 = 204)
The compressed data of 424 bytes obtained by compressing 8 bytes) is handled as one unit. This is called a sound group, and 212 bytes are assigned to each of the left and right channels. In addition, 1
One sound group is assigned to two sectors, and one cluster is composed of 36 sectors. In the MD player, this one cluster is the minimum recording unit, and data rewriting is always performed by an integral multiple of one cluster.

FIG. 2 is a diagram showing an example of the format of data recorded on the disc 1. The data of CH1 to CH4 is repeatedly recorded in order. The length of one block of data in each channel is set to one cluster. U
The TOC (User Table of Contents) contains an address at the beginning of a music number (track), and the cluster number of that address is CH1. Therefore, each channel can be identified by the UTOC and the cluster address. For example, if UTOC is described as (song number cluster: sector: sound group) = (mth song n: 0: 0), the channel of the kth cluster of the mth song is
It can be obtained from the remainder of (k−n) / 4.

Next, the edit mode will be described. As described above, since the bit rate of the data accessed to the disc 1 is ⅕ of the bit rate of the original recording signal or the reproducing signal, the disc access waiting time in both the recording mode and the reproducing mode is , About 4 hours
It reaches / 5. Therefore, if recording or reproduction of data for each channel is performed by time sharing using the respective standby times, recording or reproduction of four channels can be performed independently.

In the edit mode, such reproduction or recording for four channels is simultaneously executed in parallel. For this reason,
In edit mode, while reading the recorded data from the channel specified as the playback channel and playing it,
Record new music data on the channel specified as the recording channel. For channels not designated for recording or recording, jump is performed by a track kick.

As an editing form, the recorded data is read out, new music data is added to a part thereof and rerecorded in real time, overdubbing, a plurality of recorded data is reproduced and mixed, and then recorded in real time. Ping-pong recording to be recovered, punch-in / punch-out recording in which a part of the recorded data is changed to new music data, and the like can be considered. Such various editing modes can be performed by using the analog mixer 14 described above, for example, as shown in FIG. It can be realized by configuring. That is, the analog mixer 14 is proportional to the reproduction signal selected via the multiplier 21 in a size proportional to the coefficients a, b, c and d, and the coefficients e, f, g and h via the multiplier 22. The audio input selected with the selected size is combined and added by the adders 23, 24 and 25 to generate a recording signal.

For example, in the case of ping-pong recording in the form of CH1 + CH2 + CH3 → CH4, among the coefficients of the multipliers 21 and 22, the coefficients a4, b4 and c4 may be set to "1" and the rest to "0". Also, CH1 + CH3 → CH4,
In the case of editing form of audio input signal → CH2, coefficient a
4, c4 and f2 may be set to "1" and the rest may be set to "0".

4 and 5 are flow charts showing the processing procedure of the memory controller 9 and the system controller 17 for realizing the above-mentioned editing mode. In the edit mode, the reproduction channel and the recording channel are designated in advance by using the operation keys 19. The system controller 17 sets or resets a flag in a register corresponding to each internal channel based on the designated data. One cycle of processing is composed of confirmation of a recording channel, confirmation of its recording / reproducing channel, and reproduction thereof.

That is, as shown in FIG. 4, at the beginning of one cycle, first, a flag is set in the register corresponding to the recording channel (S1). Next, it is checked whether or not it is a recording channel in order from CH1 (S2 to S
5) If it is a recording channel, a search is performed before the address of the recording channel (S6) to check whether recording is possible (S7). The recordable state is whether or not the data accumulated in the memory 10 from the audio compression / decompression unit 12 has become one cluster, the time from the previous recording (the time from the start of audio compression at the start), or the memory 10 on the reproducing side. From the audio compression / decompression unit 12 may be determined by the address or the like. If it is not in the recordable state, it stands by until it becomes possible (S8), and then the recording operation is started (S9). As a result, the data to be recorded stored in the memory 10 is about 1.4 Mb / s.
The data is transferred to the EFM encoder / decoder 8 at the transfer rate of. When the data for one cluster is transferred, the flag of the register corresponding to the channel is cleared (S1
0), it is confirmed whether or not to record the next channel (S11). When the next channel is continuously recorded, the search operation is not performed and the recording operation is continuously started, but when the next channel is not recorded, a new search is performed (S2 to S6). Data to be recorded in the next cycle is continuously written in the memory 10 at a transfer rate of about 0.3 Mb / s.

Then, as shown in FIG. 5, a flag is set in the register corresponding to the reproduction channel (S2).
1). Next, it is checked in order from CH1 whether or not it is a reproduction channel (S22 to S25). If it is a reproduction channel, a search is performed before the address of the reproduction channel (S26) to check whether reproduction is possible. Yes (S27). Playable state is EFM encoder /
The determination may be made based on the amount of data accumulated from the decoder 8 to the memory 10, the time from the end of memory accumulation of the previous reproduction data, or the address at the time of data transfer from the memory 10 to the audio compression / decompression unit 12. If it is not in the reproducible state, wait until it becomes possible (S27, S2
8) Then, the reproduction operation is started. As a result, the output of the EFM encoder 8 is transferred to the memory 1 at a transfer rate of about 1.4 Mb / s.
It is accumulated in 0 (S29). When the data for one cluster is stored, the flag of the register corresponding to that channel is cleared (S30), and it is confirmed whether or not to reproduce the next channel (S31). When the next channel is continuously reproduced, the search operation is not performed and the reproduction operation is continuously started, but when the next channel is not reproduced, a new search is performed (S22 to S26). The data stored in the memory 10 is about 0.
It is continuously read from the memory 10 at a transfer rate of 3 Mb / s and supplied to the audio compression / decompression unit 12 of the corresponding channel.

FIG. 6A shows CH1 + CH2 + CH3 → C.
This is an example of ping-pong recording in the form of H4. While the data of CH1, CH2, and CH3 are being reproduced in the previous cycle, the combined data of these is continuously supplied to the memory 10. Therefore, one cluster of synthetic data is accumulated in the memory 10 at the beginning of the next cycle, and this is first recorded in CH4. Since CH1 to CH3 have continuous channels, they can be continuously read without interposing a search operation. The data for 3 channels read in the previous cycle is read in parallel from the memory 10 and reproduced in the entire next cycle. In this embodiment, since each channel is independent on a cluster basis,
Since all can be allocated to the search except the time of reproducing CH1, CH2 and CH3 and recording of CH4, there is a time margin and a waiting time can be obtained.

FIG. 6B shows CH1 + CH3 → CH4,
In the example of audio input signal → CH2, this is the worst case that the search operation is always required when recording or reproducing each channel. In this case, even if the time required for the search is estimated to be about 0.3 seconds, 1 cycle (about 4
You can get a waiting time of less than 1 second. Therefore, even if the search operation takes some time, there is sufficient time and no failure occurs.

By executing the edit mode based on the above control, a sufficient time margin can be secured. Therefore, as described above, the reproduced portion is output edited in the next cycle and Control such as recording in cycles can be performed. Further, if the capacity of the buffer memory 10 for performing intermittent reproduction / recording is increased, the interval of reproduction-output editing-recording will be somewhat expanded, but since buffering is possible during the waiting time, a shock proof function is provided. It is also possible.

In the above embodiment, the signals of a plurality of channels are mixed by the analog mixer 14, but they may be mixed by a digital mixer. In this case, the input data of the D / A converter 13 and the output data of the A / D converter 15 are combined, but the D / A conversion is performed between the D / A converter 13 and the digital mixer. It is necessary to provide delay correction means for compensating for the processing delay in the converter and the A / D converter.

[0030]

As described above, according to the present invention,
Since the data of each channel is continuously recorded on the disc by the minimum recording unit, the data can be recorded or reproduced independently for each channel, and if the channel is not reproduced or recorded, a track kick is performed. Of course, for a channel that is continuously reproduced or recorded, a new search after the second one is not required, so that the search time can be shortened and a sufficient time margin can be secured.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an MD player according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a disc recording format in the same device.

FIG. 3 is a block diagram showing a configuration of an analog mixer in the same device.

FIG. 4 is a flowchart for explaining an operation in an edit mode in the same device.

5 is a flowchart continued from FIG. 4. FIG.

FIG. 6 is a time chart for explaining a specific example of the edit mode.

FIG. 7 is a diagram for explaining a conventional multi-channel disc recording format.

FIG. 8 is a diagram for explaining another conventional multi-channel disc recording format.

[Explanation of symbols]

1 ... Disk, 2 ... Spindle motor, 3 ... Magnetic recording head, 4 ... Optical pickup, 5 ... Feed motor, 6 ... RF
Amplifier, 7 ... Servo control, 8 ... EFM encoder / decoder, 9 ... Memory controller, 10 ... Buffer memory, 11 ... Address recorder, 12 ... Audio compression / decompression section, 13 ... D / A converter, 14 ... Analog mixer, 1
5 ... A / D converter, 16 ... Head drive section, 17 ... System controller, 18 ... Display section, 19 ... Operation key.

Claims (1)

[Claims] 1. A read-out written in the storage means while reading out the data compressed and recorded in the recordable disk from the disc and intermittently writing the read-out data in the storage means at a first speed. Data is the first
And a reproducing means for outputting data as a reproduction signal after the data is expanded without interruption at a second speed slower than the speed, and a signal to be recorded is compressed and written to the storage means at the second speed without interruption. However, in a disc recording / reproducing apparatus including a recording unit that intermittently reads the written compressed data from the storage unit at the first speed and records the read data on the disc, A system for outputting data as a reproduction signal after reading without interruption and data expansion, and a system for compressing the signal to be recorded and writing it in the storage means without interruption for a plurality of channels are provided in parallel, and data for a plurality of channels is recorded on the disc. , And the length of the recorded data of each channel is recorded by one disk access. The minimum recording unit is set, and during the output period of the reproduction signal of the minimum recording unit, the data of each channel to be reproduced on the disk is read and written in the storage means at the first speed, An operation of reading the data of each channel to be recorded from the storage means and writing the data to the disk at the first speed in a time division manner for each channel, and a continuous read operation of the read data from the storage means; A disc recording / reproducing apparatus comprising: a control unit for simultaneously performing parallel writing operation of compressed data in the storage unit for each channel.