JP3097369B2 - Disk recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus capable of recording / reproducing a signal of 4CH only with a recording / reproducing head for 2CH (channel).

[0002]

2. Description of the Related Art Portability of compact cassette and CD
A mini disc (MD), which can be expected to have the operability and sound quality of the mini disc, can be recorded as well as reproduced. The MD adopts a new audio compression method while following the sampling method similar to that of the CD, so that the same sound quality as that of the CD can be realized with an information amount of about 1/5. For this reason, even a disk having a diameter approximately half that of a CD can achieve a reproduction time comparable to that of a CD.

[0003] Since a MD capable of recording / reproducing uses a magneto-optical disk, a corresponding MD player is equipped with an optical head for recording / reproducing and a magnetic head used at the time of recording. And the user, during normal operation,
A recording mode for writing recording data to the disk and a reproduction mode for reading reproduction data from the disk are selectively selected.

The MD player records a 2CH music signal /
Equipped with a function that can be played as standard. To record / reproduce a 4CH music signal with such an MD player, 1) operate two MD players having a common disc with the same master clock, and use one of the MD players to transmit the CH1 and CH2 signals. The other MD player may record / reproduce the signals of CH3 and CH4 in synchronization with each other, or 2) adopt an irregular format different from the standard format, and record / reproduce the signals of CH4 with only one MD player. There is a way to play it.

[0005]

However, the two-player system described in 1) above has the disadvantage that it costs two sets and that the device configuration is complicated and large.
On the other hand, the above-mentioned irregular format method 2) has a disadvantage that it cannot be implemented due to the standard, and that it is incompatible with a standard format MD player. The present invention improves the above-described points and records / records a 2CH signal on a disk.
In a disk recording / reproducing device having a function of reproducing,
An object of the present invention is to adopt a standard format and to enable recording / reproduction of a signal of 4CH with only one set of recording / reproducing head.

[0006]

In order to achieve the above object, according to the present invention, there is provided a recording means for intermittently writing recording data having a bit rate of 1/2 or less of a recording operation on a disk to the disk, A reproducing means for intermittently reading reproduction data having a rate equal to or less than の of a reproduction operation for the disk from the disk, a function of intermittently supplying first recording data to the recording means, and the reproduction means 1st read out intermittently by
A first signal processing unit having a function of processing the reproduction data, a function of intermittently supplying second recording data to the recording unit, and a second reproduction intermittently read by the reproduction unit. A second signal processing unit having a function of processing data; a recording or reproduction signal processing by the first signal processing unit and a recording or reproduction signal processing by the second signal processing unit; when the run alternately to the first area and the second area obtained by dividing the
Both have different track numbers for the data in each paired area
And a mode control means for controlling so as to be handled in the first aspect.

According to a second feature of the present invention, in accordance with the first feature, the first recording data and the second recording data are synchronized by making the difference between addresses recorded on the disk constant. Is added.

A third feature of the present invention is that a conversion function for converting a difference between a current address and a jump destination address into a target number of tracks, and a function of converting the number of tracks actually jumped to the main part of the first characteristic described above. A storage function for storing, a correction function for correcting the conversion function of the target track number based on the stored track number, and a function for using the stored track number as a target track number to a return address close to the current address. In addition, jump control means for controlling a track jump between the first area and the second area is added.

[0009]

In a disk recording / reproducing apparatus which intermittently writes recording data in the recording mode and intermittently reads reproduction data in the reproducing mode, the entire time zone of the recording / reproducing mode is not used for data writing / reading. ,
There is an intermittent standby period in which writing / reading is not performed. In such a disk recording / reproducing device,
Two signal processing units are provided, and when the first signal processing unit performs a recording / reproducing operation for an arbitrary address on the disk, the second signal processing unit uses the same disk by using the waiting period. Recording / reproducing operation for different addresses. This is possible without changing the standard format of a standardized disc such as an MD. There are four combinations of recording / reproducing operations of the two signal processing units. However, if the same mode of operation is used for both, each signal processing unit can record / reproduce a total of 4CH signals by 2CHs in one set. It can be performed using only the recording / playback head.

Assuming that the first recording data is CH1 and CH2 and the second recording data is CH3 and CH4, by synchronizing both data, the recording data becomes a total of 4CH.
In this case, if a constant difference is always provided between the recording addresses of the first and second recording data, the inter-signal synchronization can be easily performed.

Recording / recording by the first and second signal processing units
In order to alternately perform reproduction processing, a high-speed jump for frequently switching addresses is required. In this case, the difference between the track pitch and the linear velocity can be corrected by calculating the difference between the jump target track number and the actually jumped track number. In addition to this, if the number of tracks actually jumped is used as the number of target tracks to return, quick convergence to the target track, that is, high-speed search can be performed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 7 is a block diagram of a basic MD type disk recording / reproducing apparatus. In the figure, 1 is a magneto-optical disk for recording / reproducing MD, 2 is a spindle motor for rotating this disk at a constant linear velocity, and 3 is a function for optically reading information from the disk 1 and cooperating with a magnetic recording head 14 described later. An optical pickup 4 having a function of moving and writing information magneto-optically on the disk 1, a feed motor 4 for moving the pickup 3 in the radial direction of the disk 1, and a high frequency (R) for amplifying the output of the pickup 3.
F) The amplifier 6 controls the rotation of the spindle motor 2, the feed control of the feed motor 4, and the focus /
This is a servo control unit that performs tracking control.

The reproduction system of the MD player includes a decoder section of an encoder / decoder 7 for decoding (demodulating) the output of the amplifier 5, an address decoder 8 for detecting an address being reproduced from the output of the amplifier 5, and an encoder / decoder. 7, a memory 9 for temporarily storing the decoded output of the memory 9, a controller 10 thereof, an expansion unit of an audio compression / expansion unit 11 for expanding the output of the memory 9, and a D for converting the expanded output of the audio compression / expansion unit 11 into an analog signal. / A converter 12. The encoder / decoder 7 uses EFM (eight to fourteen modulation) as a modulation method and CIRC (cross interleave reed-solo) as an error correction method.
mon code).

The recording system of the MD player includes an A / D converter 13 for converting an analog signal into a digital signal, and an audio compression for compressing the converted digital signal so as to remove components unnecessary for reproducing an audio signal. Compression / decompression unit 11, a memory 9 for temporarily storing compressed signals and its controller 10, an encoder unit of the encoder / decoder 7 for encoding (modulating) the output of the memory 9, and an encoder for this encoder unit. A magnetic recording head 14 for writing the signal thus recorded on the disk 1 and a head drive circuit 15 for the magnetic recording head 14 are provided. Reference numeral 16 denotes a system controller for controlling the entire system, 17 denotes a display unit for displaying various information, and 18 denotes a plurality of operation keys for giving various instructions.

The above-mentioned MD player is based on a CD player, and has a voice compression technique, an earthquake-resistant technique, a user recording function, and the like added thereto. The audio compression performed by the audio compression / decompression unit 11 is performed in such a manner that unnecessary data is thinned out using the characteristics of human hearing. For example, ATRAC (Adapti
ve Transform Acoustic Coding) realizes about 5 times information compression by utilizing the minimum audible characteristics of human beings and the masking effect. The decompression unit for restoring the compressed data combines the decode outputs of the encoder / decoder 7 and sequentially reproduces the digital waveform. With this method, a quality equivalent to a signal can be reproduced when represented by a level change in 16-bit steps and a sampling frequency of 44.1 kHz. In order to perform the data compression / decompression, a buffer memory 9 having an appropriate capacity is required on the signal processing circuit.

One of the characteristics of the MD player is "jumping".
There are earthquake-resistant technologies to deal with. This is realized by utilizing the difference between the read speed of the pickup 3 and the transfer speed of data input to the audio compression / decompression unit 11 and using the memory 9 as a data buffer. That is, the read speed of the pickup 3 is as high as 1.4 Mb (megabit) / s, whereas the transfer speed of data input to the audio compression / decompression unit 11 is as low as 0.3 Mb / s. Therefore, when the 1-Mbit memory 9 is used, data for about 3 seconds can be stored. For this reason, even if the reading from the disk 1 is stopped due to the vibration, if the audio output is restored within 3 seconds, the reproduced audio output does not need to "jump".

The memory 9 is also used at the time of writing.
In this case, the audio compression / decompression unit 11 outputs 0.3 Mb / s
Is temporarily stored in the memory 9, read out, and then transferred to the encoder / decoder 7 at 1.4 Mb / s. Since writing to the disk 1 by the recording head 14 is performed at 1.4 Mb / s, this writing is intermittent, using only a part of the entire processing time. In this case, the writing method employs a magnetic field modulation method in which a laser beam having a constant intensity is irradiated from the optical pickup 3 to the lower surface of the disk 1 and a magnetic field modulated by write data by the magnetic recording head 14 is applied from the upper surface. .

FIG. 8 is an explanatory diagram showing the above-mentioned intermittent writing. In this figure, the horizontal direction is the time axis, and the vertical direction shows the flow of processing. The uppermost row is audio data of a transfer rate of 1.4 Mb / s digitized by the A / D converter 13, and when this is compressed by the audio compressor 11, the data of the transfer rate of 0.3 Mb / s shown in the middle is shown. It becomes compressed data. The compressed data reaches the magnetic head 14 via the memory 9 and the EFM encoder 7 (a head drive circuit is omitted), and is written to the disk 1 at a speed of 1.4 Mb / s in terms of audio data. Therefore, a standby time longer than one writing time is interposed between writing operations.

When the magnetic field modulation method is used for writing, only the portion irradiated with the laser beam from the optical pickup 3 is magnetized by the magnetic field reversal action of the magnetic head 14, and information of 1 or 0 is written. At this time, the recording density is determined by the performance of the optical pickup 3, and when the optical constant is the same as that of the CD, the write transfer rate is 1.4 Mb / s in terms of audio data as described above. The write amount per cycle and the standby time are determined by the system design, but there is always a standby time. The same applies to reading.

FIG. 1 is a block diagram showing an embodiment of the present invention. The disk recording / reproducing apparatus shown in this example is shown in FIG.
Based on the above configuration, the following configuration is added in terms of hardware. That is, the A / D converter 13-1, the D / A converter 12-1, the audio compression / expansion unit 11-1, the first area memory 9-1 (for example, a 4 Mbit DRAM), the memory controller 10-1 Is a standard equipment included in the configuration of FIG. 7, but if this is used as the first area signal processing unit 100, the A / D converter 1
3-2, D / A converter 12-2, audio compression / decompression unit 11-
2, a second area memory 9-2 (for example, a 4 Mbit DRAM) and a second memory controller 10-2
The area signal processing section 200 is provided independently, and these are operated by the same master clock. The other components are denoted by the same reference numerals as in FIG. 7 and detailed description is omitted.

The system controller 16 performs various controls according to an internal program. First, the operation of the first area signal processing unit 100 and the second area signal processing unit 200
Is alternately repeated using the respective standby periods. Second, an operation (recording / reproduction 1) by the signal processing unit 100 and an operation (recording 2 / reproduction 2) by the signal processing unit 200 are selected, and recording 1-record 2, recording 1-reproduction 2, reproduction 1 are performed. -Set to one of four combinations of recording 2 and playback 1-playback 2. Third, when recording 1 to recording 2 are performed on 4CH signals, the recording addresses are controlled so that the signals of each 2CH are recorded synchronously. The same applies to the case where a signal of 4CH is reproduced by reproduction 1-reproduction 2. Other controls will be clarified in the following description.

When a normal reproduction mode is set by the operation key 18, data reproduction of 2CH is performed using the optical pickup 3 and one signal processing unit, for example, the signal processing unit 100. When the normal recording mode is set by the operation keys 18, the optical pickup 3, the recording head 1
4 and the signal processing unit 100, data recording of 2CH is performed. On the other hand, when the multiplex mode is set by the operation keys 18, the recording / reproducing of 4CH, more specifically, 2CH + 2CH, in which the signal processing units 100 and 200 alternately operate, is performed.

In order to perform the multiplex mode operation without changing the standard format of the MD, the program area of the disk 1 is divided into two parts in the radial direction as shown in FIG. 2, or several hundred tracks as shown in FIG. The first area signal processing unit 100
A first area to be accessed by the user and a second area to be accessed by the second area signal processing unit 200 are set. This program area is divided into a lead-in area, a UT,
This is a portion excluding the OC area and the lead-out area.
The UTOC area is a user rewritable TOC (table
of contents) area, and this and the program area constitute a recordable area.

FIG. 4 is a diagram for explaining the operation at the time of 4CH signal recording in which the recording operation of the first area and the recording operation of the second area are alternately performed. As shown in the flow from the uppermost stage to the center, the audio input 1 (CH1, 2) input to the first area signal processing unit 100 is subjected to A / D conversion, audio compression, storage, encoding, and encoding. , Addresses n0, n1, n2 of program area 1 (first area) of disk 1
.. Are written intermittently (W). 1 for area 1
When the writing (W) has been completed one time, a standby period until the next writing is started. During this period, the search (S) and the writing (W) of the write address of the area 2 are performed.

As shown in the flow from the bottom of FIG. 4 to the center, the audio input 2 (CH3, 4) input to the second area signal processing unit 200 is subjected to A / D conversion, audio compression,
After being accumulated and encoded, it is intermittently written to addresses m0, m1, m2,... Of the program area 2 (second area) of the disk 1 (W). When one write (W) to the area 2 is completed, a standby period until the next write is started. During this time, search (S) and write (W) of the write address of the area 1 are performed.

Thereafter, by repeating such an alternate recording operation, a signal of 4CH is recorded in the form of 2CH + 2CH. In this case, the recording in the areas 1 and 2 on the disk 1 is performed in a time-division manner with respect to the audio inputs 1 and 2 input in synchronization, so that the recording in the second area is performed with respect to the recording in the first area. It is necessary to control to delay the data reading from the memory 9-2 by the delay time.

FIG. 5 is an explanatory diagram of the operation at the time of 4CH signal reproduction in which the reproduction operation of the first area and the reproduction operation of the second area are alternately performed. As shown in the flow from the center to the top of the figure, the address n of the program area 1 of the disc 1
The (R) reproduction data read out intermittently from 0, n1, n2,... Is decoded, stored, decompressed, and D / A converted, and then output as audio output 1 (CH1, CH2). When one reading (R) for area 1 is completed, a standby period until the next reading is started. During this period, search (S) and reading (R) of the reading address of area 2 are performed.

As shown in the flow from the center of FIG. 5 to the bottom, the address m of the program area 2 of the disk 1
The (R) reproduced data read out intermittently from 0, m1, m2,... Is decoded, stored, decompressed, and D / A converted, and then output as audio output 2 (CH3, 4). When one reading (R) for the area 2 is completed, a standby period until the next reading is started. During this time, the search (S) and reading (R) of the reading address of the area 1 are performed.

Hereinafter, the signal of 4CH is reproduced in the form of 2CH + 2CH by repeating such an alternate reproducing operation. In this case, control for delaying the data reading from the memory 9-1 and synchronizing the audio outputs of CH1 to CH4 is required.

FIG. 6 is a diagram for explaining the operation of 2CH reproduction and 2CH recording in which the reproduction operation of the first area and the recording operation of the second area (or vice versa) are alternately performed. The audio input 2 (CH3, 4) input to the second area signal processing unit 200 as in the flow from the bottom of this figure toward the center.
Are A / D conversion, audio compression, accumulation, and encoding, and then the address m0,
are written intermittently to m1, m2,... (W). Area 2
When one write (W) to is completed, a standby period until the next write is started. During this time, search (S) and read (R) of the reproduction address of area 1 are performed.

As shown in the flow from the center to the top in FIG.
The (R) reproduction data read out intermittently from 1, n2, n3,... Is decoded, stored, decompressed, and D / A converted, and then output as audio output 1 (CH1, CH2). When one reading (R) for the area 1 is completed, a standby period until the next reading is started. During this period, the search (S) and the writing (W) of the write address of the area 2 are performed.

Hereinafter, by repeating such alternate recording / reproducing operation, one 2CH signal can be reproduced (recorded) while another 2CH signal can be recorded (reproduced) at the same time. In this case, delay control is performed at the time of reading from the memory, and the timing of the audio output A1 of the first area and the timing of the audio input A2 of the second area are synchronized.
Then, at the address on the disk 1, (n1, m
Since (1), (n2, m2)... Correspond, the timing of writing (W) and the timing of reading (R) are shifted. However, since the signal to be recorded and the signal to be reproduced are independent, this point is not a problem.

Points to be considered in actually performing the above operation and countermeasures will be described below. First, in order to comply with the MD standard, for example, the track number of the first area is set to an odd number, and the track number of the second area is set to an even number. That is, the track numbers (1, 2), (3,
4), (5, 6)... Are controlled so that they are treated as the same program. In this way, the same program can be reproduced in 2 discs even if the disc recorded in 4CH according to the present invention is reproduced by an ordinary MD player.
There is no special problem since the data is only reproduced twice in units of CH. That is, track number 1 is CH1,
2, track number 2 is CH3,4, track number 3 is C
This is because H1, H2 and track number 4 have a relationship of CH3, 4,.

In order to speed up the search operation between the two areas using the waiting period, the following measures are taken. 1
One is the area division method. Compared with the method of dividing the whole into two parts as shown in FIG. 2, when the area is divided into several hundred tracks as shown in FIG. 3, it is unnecessary to feed the entire optical pickup 3 in the radial direction. A track jump in which the provided actuator equipped with the objective lens is rotated at high speed by applying a kick pulse to the tracking coil can be supported. Track jump is
It is not only faster than the feed system, but also less burdened mechanically. This merit becomes more remarkable as the area is subdivided within the range of the number of linking points that can be stored in the UTOC area.

A second measure for speeding up the search operation is address control. That is, the difference between the start addresses of the first area and the second area is set to a predetermined value N, and data is recorded so that the addresses are continuous in each area. In this way, the difference between the addresses of the corresponding data between the two areas is always kept constant, so that the jump destination address is known in advance.

Third, in addition to the address control described above,
The following jump control means is added. (1) means (by ROM or calculation) for converting the number of tracks to be jumped from an address difference (constant) between an arbitrary address in the first area and the corresponding address in the second area; (2) track jump control means based on a numerical value obtained from the conversion means (a normal tracking servo system can be used); (3) the number of tracks actually jumped between the first area and the second area (for example, tracking (4) means for storing a track jump from the second area to the first area, which is obtained by counting an error signal, and a numerical value stored in the storage means (3) or a value close thereto (preferably). (5) means for controlling in the direction of address change) (5) The difference between the numerical value obtained from the conversion means of (1) and the numerical value stored in the storage means of (3) Seeking a means for correcting the conversion result of the conversion means (1).

The means (4) eliminates the need to convert the number of tracks to return, so that the time until the start of jump is shortened. The means (5) absorbs deviations in track pitch and linear velocity, so that convergence to the target track after jumping (by the tracking servo) is expedited. Therefore,
By using the above-described area division, address control, and jump control together, the speed of the jump between the first and second areas is increased.

In the above description, the MD is used as an example, but the present invention is not limited to the MD. That is, the present invention can be applied to any disk recording / reproducing apparatus that performs intermittent recording / reproduction similarly to the MD.

[0039]

As described above, according to the present invention, 2
In a disc recording / reproducing apparatus having a function of recording / reproducing a CH signal to / from a disc, a standard format is adopted, and recording / reproducing of a 4CH signal can be performed with only one set of recording / reproducing heads. Moreover, with the device of the present invention, 4
Even if the disc on which the CH is recorded is reproduced by a normal reproducing apparatus, the reproduced signal is only reproduced twice for each 2CH, so that there is no problem such as generation of noise. Further, since recording / reproduction can be performed not only in recording / reproduction of 4CH but also in units of 2CH, various usages can be expected. Further, since the signal for each 2CH can be synchronized with the address on the disk, accurate synchronization can be expected as an audio signal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a first mode of program area division.

FIG. 3 is an explanatory diagram showing a second mode of program area division.

FIG. 4 is an explanatory diagram of an operation during simultaneous recording and recording according to the present invention.

FIG. 5 is an explanatory diagram of an operation during simultaneous reproduction-reproduction of the present invention.

FIG. 6 is an explanatory diagram of an operation during simultaneous reproduction and recording according to the present invention.

FIG. 7 is a block diagram of a basic MD recording / reproducing device.

FIG. 8 is an explanatory diagram showing intermittent writing of an MD.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disk, 2 ... Spindle motor, 3 ... Optical pickup, 4 ... Feed motor, 5 ... High frequency amplifier, 6 ... Servo control unit, 7 ... EFM encoder / decoder, 8 ... Address decoder, 9 ... Memory, 10 ... Memory controller ,
11: voice compression / decompression unit, 12: D / A converter, 13: A
/ D converter, 14: magnetic recording head, 15: head drive circuit, 16: system controller, 17: display unit, 1
8 ... operation keys, 100 ... first signal processing unit, 200 ... second signal processing unit.

Claims (3)

(57) [Claims] A recording means for intermittently writing recording data having a bit rate equal to or less than 記録 of a recording operation on the disk to the disk;
/ 2 intermittently reading the reproduction data of not more than / 2 from the disk; a function of intermittently supplying the first recording data to the recording means; A first signal processing unit having a function of processing reproduction data; a function of intermittently supplying second recording data to the recording unit; and a second reproduction data intermittently read by the reproduction unit. A second signal processing unit having a function of processing a recording / reproducing signal processing by the first signal processing unit and a recording / reproducing signal processing by the second signal processing unit. together they are performed alternately with respect to the first area and the second area divided pairs
Area data is handled with different track numbers
And a mode control means for controlling the recording and reproducing of the disc. 2. A recording means for intermittently writing recording data having a bit rate of 1/2 or less of a recording operation on a disk to said disk;
/ 2 intermittently reading the reproduction data of not more than / 2 from the disk; a function of intermittently supplying the first recording data to the recording means; A first signal processing unit having a function of processing reproduction data; a function of intermittently supplying second recording data to the recording unit; and a second reproduction data intermittently read by the reproduction unit. A second signal processing unit having a function of processing a recording / reproducing signal processing by the first signal processing unit and a recording / reproducing signal processing by the second signal processing unit. together they are performed alternately with respect to the first area and the second area divided pairs
Area data is handled with different track numbers
And mode control means for controlling to divide, the first recording data and the second recording data, characterized by comprising and means for synchronizing to a constant difference between the address to be recorded on the disk Disk recording and playback device. 3. A recording means for intermittently writing recording data having a bit rate of 1/2 or less of a recording operation on the disk to the disk, and a recording means for writing data on the disk at a reproducing operation on the disk.
/ 2 intermittently reading the reproduction data of not more than / 2 from the disk; a function of intermittently supplying the first recording data to the recording means; A first signal processing unit having a function of processing reproduction data; a function of intermittently supplying second recording data to the recording unit; and a second reproduction data intermittently read by the reproduction unit. A second signal processing unit having a function of processing a recording / reproducing signal processing by the first signal processing unit and a recording / reproducing signal processing by the second signal processing unit. A mode control means for alternately executing the divided first and second areas, a conversion function for converting the difference between the current address and the jump destination address into a target track number, A storage function of storing the number of tracks jumped at the time, a correction function of correcting the conversion function of the target track number based on the stored track number, and a target track to the return address close to the current address by the stored track number. And a jump control means for controlling a track jump between the first area and the second area, the disc recording / reproducing apparatus having a function to be used as a number.