JPH06309788A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To excellently record information with a simple constitution by writing in compressed information divided into blocks and recording the same information into plural areas in a recording medium while reading out every plural block at a high speed intermittently. CONSTITUTION:A digital input is divided into blocks and compressed and then written in a memory buffer memory 28 by an information compressing circuit 27. The written-in information are read out from the memory 28 at a higher speed than the writing speed intermittently. Then, the same consecutive information of plural time base-compressed are stored in plural different areas being two areas, etc., on a magneto-opticol disk 1. Thus the information is excellently recorded to deal with recording defects due to shocks, etc., with the simple constitution. Further, a reproductin is performed in the same way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus for recording and reproducing a digitized audio signal or the like on a recording medium such as a disc.

[0002]

2. Description of the Related Art Conventionally, various devices have been used for recording / reproducing continuous information such as music information. Due to the progress of digital technology in recent years, digital recording / reproducing devices such as optical disk devices have been put to practical use. Has been converted. For example, a compact disc player is a read-only optical disc device that uses a compact disc (hereinafter referred to as a CD) as a medium, and is widely popular due to advantages such as high sound quality.

As shown in FIG. 16, a disc 101 as a CD is a disc medium in which continuous information such as music information is recorded as digital information by minute pits that can be detected optically, and TOC (Table Of Contents) is provided. Area 1
01a and a main information area 101b. In the main information area 101b, main information such as music information and a sector number by a sub code 102b (see FIG. 17) described later are recorded. In the TOC area 101a, additional information regarding each of the above main information is recorded as a subcode 102b. The additional information is information such as each track number, the recording start sector number of each track, and information for identifying whether the track is an audio signal such as music or computer data.

Each signal is recorded on the disc 101 in the format shown in FIG. The frame 102 of the recording signal is composed of a frame synchronization signal 102a indicating the beginning of the frame 102, a subcode 102b indicating additional data information, and a data field 102c. The data field 102c is data in which error detection / correction parity is added to the 24-byte data that is the main information, and is a CIRC (Cross Interleave Reed Sol).
It is composed of an error detection and correction method that combines non-complete interleaving called Omon Code).

As shown in FIG. 18, the sector 103 has 9 sectors.
It consists of 8 frames, and the frame sync signal 1
03a, subcoding frame 103b consisting of 98 subcodes 102b, and data field 1
03c. The sub-coding frame 103b indicates a track number (called song number when the main information is music information), absolute address information on the disc, and the like. Since the sector length of the sector 103 is 1/75 second, 75 sectors are 1 second. Also, the sector number is
Minute: second: As frame information (the frame is a 75-ary), continuous time information and position information sequentially increasing from the innermost circumference of the main information area 101b are shown.

The data field 103c has main data of 2352 bytes and parity of 784 bytes according to the 98 frame structure, and the number of data per second and the number of data per sector are set as follows. Allocated as main data. When audio information is arranged in the main data, according to the CD format, the sampling frequency is 44.1 kHz, the quantization is a 16-bit straight line, and the number of channels is 2 (stereo).
Therefore, the number of data per second is 44.1 kHz × 16 × 2 = 1.4112 Mbit = 1
This is 76.4 kbytes. The number of data per sector is 176.4 kbytes / 75 = 2352 bytes.

In the CD player, the subcode information in the TOC area 101a is read based on the format configured as described above. Then, the number of each piece of main information (the number of songs in the case of music information), the sector number of the recording start position of the main information, and the type of the main information (audio or computer data) are recognized. Further, the sector number is collated by the information in the TOC area 101a and the subcode 102c in the main information area 101b in response to the subsequent reproduction instruction, so that reproduction of a desired track can be quickly performed with an access operation. To be done.

A CD is a so-called CLV (Con
The recording density is constant at any position of the CD because the recording is performed by the stant linear velocity method, and the recording capacity is improved. In an actual CD player, the CLV control is performed by controlling the rotation of the CD so that the interval between the reproduction signals (for example, the frame synchronization signal 102a) of the CD recorded in the CLV in the above signal format becomes the reference length. To be done.

On the other hand, in recent years, a disc recording / reproducing apparatus capable of recording various kinds of information such as music information and computer information on a rewritable disc such as a magneto-optical disc has been developed further from the CD. When such a disc recording / reproducing apparatus is put to practical use, it is desirable that the reproducing system is made common with the conventional CD to have compatibility.

However, when recording is performed on an unrecorded initial disc by the above-mentioned disc recording / reproducing apparatus, there arises a disadvantage that an access operation to an arbitrary sector prior to recording and CLV control necessary during recording cannot be performed. This is because the initial disc does not contain any absolute address information using subcodes according to the signal format of the CD and the frame sync signal used for CLV control.

Therefore, in order to eliminate the above-mentioned inconvenience,
Japanese Patent Laid-Open No. 64-39632 proposes an absolute address recording method equivalent to absolute address information by subcode. In this method, after the bi-phase mark modulation of the absolute address, the guide groove of the initial disc is biased inward or outward in the radial direction of the disc depending on whether each bit is "1" or "0". Or, change the width of the guide groove.

According to the above method, the frequency band of the absolute address by the biphase mark modulation and the EFM (Eight
By making the frequency band of the recorded information by modulation different from each other, it becomes possible to reproduce them separately from each other. Therefore, by using the above-mentioned absolute address by the guide groove, it is possible to access the area having no recorded information. Further, by using the reproduction carrier component of the above absolute address, accurate CL can be obtained not only during reproduction but also during recording.
V control becomes possible.

[0013]

However, in a disc recording / reproducing apparatus using the above-mentioned rewritable disc as a recording medium, the following two problems occur especially when recording music information.

During recording, a disturbance such as vibration may be applied to the disk recording / reproducing apparatus to cause a light beam tracing abnormality. In addition, there are cases where unusable areas such as large defects exist on the recording medium, and good recording cannot be performed. In such a case, the user will notice the recording abnormality only by playing the recorded music.

When the above abnormality occurs, when recording (dubbing) from a package medium such as a CD or tape,
Since the sound source is at hand, it can be recorded correctly by re-recording without vibration or by re-recording on a normal recording medium. However, FM
When recording a sound source that does not remain at hand such as broadcasting, if the above abnormality occurs, the opportunity to correctly record is lost.

In the above disk recording / reproducing apparatus,
It is not possible to record other information for another purpose during the recording operation. This is because the recording operation in the disk recording / reproducing apparatus described above is performed only for a single audio signal as in a conventional general consumer information recording / reproducing apparatus such as a tape recorder using a compact cassette. Because.

For example, a CD player, a tape recorder,
When performing dubbing from a CD to a tape in an audio device such as a CD / cassette tape recorder with a radio in which a radio, an amplifier and a speaker are integrated, there are the following inconveniences. That is, in this case, since the output of the CD player is connected to the input of the tape recorder during recording, even if the user encounters an opportunity to provide his favorite music such as FM broadcast during recording, the recording is not completed. It is possible. Therefore, in order to perform the recording, the above dubbing must be interrupted.

As a matter of course, a recording / reproducing apparatus for business use or a special purpose includes a multi-track recorder which has a large number of recording channels and can perform recording / reproducing independently for each channel. However, such a recording / reproducing apparatus has a problem that it cannot be easily used for consumer use because it is complicated in operation due to its multi-function and expensive.

The present invention has been made in view of the above circumstances, and is an inexpensive and simple configuration of an information recording / reproducing apparatus capable of simultaneously recording the same information or different information on the same recording medium. It is intended to be provided by. It should be noted that "simultaneous recording" here includes recording at different times within the real time when the information to be recorded is provided.

[0020]

In order to solve the above-mentioned problems, an information recording / reproducing apparatus of the present invention records information on a recording medium such as a magneto-optical disk based on absolute address information.
An information recording / reproducing apparatus for reproducing is characterized by having the following two configurations, respectively.

That is, the first information recording / reproducing apparatus has a storage means for storing the continuous information, and a storage control means for writing the continuous information into the storage means for each block divided into a predetermined size at the write transfer speed. Read control means for intermittently reading the continuous information stored in the storage means from the storage means at a read transfer rate higher than the write transfer rate for each of a plurality of blocks, and a read control means for reading the continuous information. The same information recording control means is provided for recording the outputted information in a plurality of different areas on the recording medium each time it is read.

In the second information recording / reproducing apparatus, the information-based storage means for individually storing the continuous information and the plurality of continuous information are divided into a predetermined size at the write transfer speed in the information-based storage means. Information-based storage control means for storing each block, and continuous information stored in the information-based storage means are read from the information-based storage means intermittently at a plurality of blocks at a read transfer rate faster than a write transfer rate. The information-based read control means is provided, and the different information recording control means that records the information read under the control of the information-based read control means in different areas on the recording medium for each read.

[0023]

In the first information recording / reproducing apparatus described above, continuous information such as music is written into the storage means by the storage control means at a write transfer rate for each block. The continuous information stored in the storage means is intermittently read by the read control means at a read transfer rate for each of a plurality of blocks. Since the read transfer speed is faster than the above write transfer speed, the continuous information is compressed on the time axis in the read state as compared with the original state.

The read information of a plurality of blocks is first recorded in a certain area on the recording medium by the same information recording control means, and further recorded in different areas on the recording medium. Since the information read from the storage means is compressed as described above, it is apparent that the continuous information is multiplex-recorded in real time.

Therefore, according to the above configuration, when the continuous information is recorded in a certain area of the recording medium, the continuous information is not normally recorded due to the influence of vibration or the like or the defect of the recording medium. Also, it is possible to select and reproduce normal recorded contents from the same continuous information recorded in another area of the recording medium. Further, it is possible to allocate a time other than the time required for recording in the real time of continuous information to the time for the head to access the recording position of the recording medium. As a result, the same continuous information can be recorded a plurality of times with a single head.

On the other hand, in the above second information recording / reproducing apparatus configuration, different continuous information such as music is written in the information storage means by the information storage control means at the write transfer speed. Each piece of continuous information stored in the information-based storage means is intermittently read by the read control means at a read transfer rate for each of a plurality of blocks. Since the read transfer rate is faster than the above write transfer rate, each piece of continuous information is compressed on the time axis in the read state as compared with the original state.

A plurality of blocks of certain information read out are
First, the different information recording control means records in a certain area on the recording medium. In addition, a plurality of blocks of the other read information are recorded in different areas on the recording medium. Since the information read from the information storage means is compressed as described above, it is apparently recorded in parallel in real time as continuous information.

Therefore, according to the above configuration, when a request for recording another continuous information is made while recording one continuous information, each continuous information can be recorded in parallel. it can.

[0029]

【Example】

[Embodiment 1] The following description will discuss Embodiment 1 in which the present invention is applied to a disk recording / reproducing apparatus, with reference to FIGS. 1 to 11.

The magneto-optical disk 1 shown in FIG. 2 is used as a recording medium in the disk recording / reproducing apparatus according to this embodiment. The magneto-optical disc 1 is a rewritable type optical disc, and has a TO
The C area 1a is provided, and most of the area on the outer peripheral side of the TOC area 1a is provided as the main information area 1b.

Music information, which is continuous information, is recorded as main information in the main information area 1b.
Further, in the TOC area 1a, additional information relating to each information recorded in the main information area 1a, for example, a music number, a start absolute address position and an end absolute address position of each information is recorded. . The signal format for recording on the magneto-optical disk 1 is the same as the signal format for the conventional CD described above, and therefore its description is omitted.

As shown in FIG. 3, on the recording surface of the above-mentioned magneto-optical disk 1, spiral guide grooves 2 (shown by hatching for convenience) are formed at predetermined intervals along the disk radial direction. Has been done. Further, the absolute address on the magneto-optical disk 1 is set by using the guide grooves 2.

After the bi-phase modulation, the absolute address is
Depending on whether it is "1" or "0", the guide groove 2 ...
Is set to the inner side or the outer side in the radial direction of the magneto-optical disk 1. The absolute address represents a position on the magneto-optical disk 1 and serves as prerecorded information as CLV rotation control information. Further, since the absolute address here corresponds to one sector in the above-mentioned CD format, it is hereinafter also appropriately referred to as a sector.

4 to 6 show an example of the data arrangement used in this embodiment, which is based on the above-mentioned CD format.

FIG. 4 shows the format of the main data portion of 2352 bytes, that is, the main data field 3 in the sector structure (see FIG. 18).
The main data field 3 is composed of a sector synchronization signal 3a for identifying the beginning of a sector, a sector address 3b indicating the address of each sector, and user data 3c.

The sector address 3b has the same value as the absolute address information previously recorded on the magneto-optical disk 1, for example. In such a format, if an example of a CD-ROM (Compact Disc-Read Only Memory) is applied, 12 bytes are allocated to the sector synchronization signal 3a and 4 bytes (CD-RO) to the sector address 3b.
In M, it is called a header).
Therefore, as the user data 3c per sector, 2352-12-4 = 2336 bytes can be used.

FIG. 5 shows the format of the block B _k used to enable rewriting of information in this embodiment. The block B _k (k is 0 and a positive integer) is the minimum unit of information handled in the recording / reproducing operation, and is composed of a total of 15 sectors S _{0 to} S ₁₄ . Of these, sectors S ₀ · S ₁ · S ₁₃
S ₁₄ is a sector group added to rewrite information in block units. This sector group is provided for the following reason.

When attempting to rewrite information using the CD format, the information on the target sector positions will be dispersed to the preceding and succeeding sectors on the actual disk due to the above-mentioned non-complete interleaving by CIRC. Will be difficult to rewrite. For this,
It is described in detail in Japanese Patent Publication No. 1-55787.

Further, according to the CD format, all the recorded information is continuous, but if rewriting is performed, many data errors occur at the recording start point and the recording end point. Therefore, in order to realize the original correction capability of CIRC, 105 frames are required as the code propagation length due to non-complete interleaving. Therefore, at least 105 / 98≈1.07 sectors are required before and after the sector composed of 98 frames. In practice, it is desirable to provide two additional sectors because the number of sectors is an integer. The additional sector in the front is the PLL from the recording start point.
It is also necessary as an area for pulling in (Phase Locked Loop).

As described above, in the block B _k , the data block 4 is arranged as the user data 3c in the sectors S _{2 to} S ₁₂ among the 15 sectors S _{0 to} S ₁₄ . As this data block 4, 2336 × 11≈25.7 bytes≈206 k bits are given. Further, before and after the sectors S _{2 to} S ₁₂ , additional sectors are added to the sectors S ₀ · S ₁ and the sector S _13.
S ₁₄ and S ₁₄ are arranged respectively.

FIG. 6 shows the arrangement of blocks B _k used for actual music information. The program 5 corresponding to one music piece is composed of a set of continuous blocks such as a plurality of blocks B _k (k = 0 to n).

Subsequently, a schematic structure of the disc recording / reproducing apparatus will be described.

As shown in FIG. 7, the disk recording / reproducing apparatus according to this embodiment includes a spindle motor 11. The spindle motor 11 is a motor that supports and rotates the magneto-optical disk 1. This spindle motor 1
1 is controlled by the CLV control circuit 12 so as to rotate at a constant linear velocity.

Further, the present disk recording / reproducing apparatus is provided with an optical head 13 and a coil 14, and a so-called overwriting-capable magnetic field modulation system for recording new information over recorded information. Has been adopted. In this disc recording / reproducing apparatus, the magneto-optical disc 1 is irradiated with laser light from the optical head 13 for recording or reproduction, and at the time of recording, a magnetic field modulated by information to be recorded by the coil driver 15 is recorded by the coil 14. It is adapted to be applied to the magneto-optical disk 1.

Further, the present disc recording / reproducing apparatus has a recording system processing section 16, a reproduction system processing section 17, a prerecorded information detection circuit 18, an absolute address detection circuit 19, a controller 20, a TOC memory 21, and The operation unit 22, the display unit 23, the input terminal 24, and the output terminal 25 are provided.

The recording system processing unit 16 includes an A / D converter 26, an information compression processing circuit 27, and a recording buffer memory 2.
8 and a recording data processing circuit 29.

The A / D converter 26 receives an analog audio signal (music information) input from the input terminal 24.
With a sampling frequency of 44.1 kHz and a quantization bit number of 16
It is a circuit that converts into a digital signal.

The information compression processing circuit 27 is a circuit for compressing the digital signal output from the A / D converter 26 using a predetermined algorithm. The information compression processing circuit 27 processes the digital signal to 128 per channel.
Compress to kbps.

Since the present disk recording / reproducing apparatus handles audio signals of 2 channels, digital signals for 2 channels are compressed to 256 kbps.
In other words, since information of 44.1 × 16 × 2≈1.41 Mbps is compressed to 256 kps, the compression rate of the digital signal of the information compression processing circuit 27 is 256 k / 1.41 M≈1 / 5.5. Become.

A concrete method of compression is described, for example, in Shinji Hayashi, "Sound Coding Algorithm and Standardization Trend" (Technical Research Report of Institute of Electronics, Information and Communication Engineers, Vol. 89).
No. 434 pp. 17-22) and the like, various methods as introduced can be used, and therefore detailed description thereof will be omitted here.

In addition to the above-mentioned compression processing, the information compression processing circuit 27 follows the sector synchronization signal 3a and the sector address 3b given from the controller 20 for each sector according to the format of the main data field 3c shown in FIG. After the addition, the additional sector shown in FIG. 5 is generated. From the information compression processing circuit 27, the additional sector is sent out as a compressed audio block together with the compressed audio information.

Recording buffer memory 28 as storage means
Is a semiconductor memory that temporarily stores the compressed audio block. Under the control of the controller 20, the recording buffer memory 28 sequentially writes the compressed audio block into each block divided into a predetermined size at the write transfer speed transferred from the information compression processing circuit 27, and also at the write transfer speed. It is designed to read every plural blocks at a higher read transfer speed.

The recording data processing circuit 29 is a circuit for performing the following various processes for recording. (1) Generation of parity for error detection and correction by CIRC (2) Addition of the parity to the compressed audio block read from the recording buffer memory 28 (3) Controller 2 for the compressed audio block
Addition of subcode information from 0 (4) EFM modulation of compressed audio block to which parity and subcode information is added (5) Addition of frame synchronization signal to compressed audio block after EFM modulation Then, the above recording data processing circuit The recording signal output from 29 is applied to the coil driver 14.

The reproducing system processing section 17 includes a reproducing amplifier 30,
A reproduction data processing circuit 31, a reproduction buffer memory 32, an information expansion processing circuit 33, and a D / A converter 34 are provided.

The reproduction amplifier 30 is an amplifier for amplifying a weak reproduction signal output from the optical head 13, and also performs waveform equalization and binarization of the reproduction signal, generation of a focus error signal and a tracking error signal, and the like. I am supposed to do it.

The reproduction data processing circuit 31 is a circuit for performing the following various processes for reproduction. (1) Separation of the frame synchronization signal from the binarized magneto-optical signal (Ps) in the reproduced signal that has passed through the reproduction amplifier 30 (2) EFM demodulation of the binarized magneto-optical signal (Ps) (3) After EFM demodulation Separation of Subcode Information from Playback Data (4) Error Correction by CIRC Using Parity of Playback Data That is, the playback data processing circuit 31 performs the processing performed on the compressed audio block by the recording data processing circuit 29 at the time of recording. By performing each of the above processing according to
It is designed to restore compressed audio blocks.

The reproduction buffer memory 32 stores the compressed audio block output from the reproduction data processing circuit 31,
It is a semiconductor memory that stores once. Under the control of the controller 20, the reproduction buffer memory 32 sequentially writes the compressed audio blocks at the write transfer speed transferred from the reproduction data processing circuit 31, and reads the compressed audio blocks at a read transfer speed lower than the write transfer speed. It has become.

The information decompression processing circuit 33 is a circuit for performing decompression processing corresponding to the compression processing in the information compression processing circuit 27 on the compressed audio information of the compressed audio block read from the reproduction buffer memory 32. Further, the information decompression processing circuit 33 extracts the sector address information from the above compressed audio block and extracts the sector address information from the controller 2
It is designed to be sent to 0.

The D / A converter 34 is a circuit for converting the digital audio signal output from the information expansion processing circuit 33 into an analog signal.

Next, other components of this disc recording / reproducing apparatus will be described.

The pre-recorded information detection circuit 18 is a circuit which takes in the bi-phase mark modulated absolute address information as pre-recorded information from the reproduced signal from the reproduction amplifier 30 and generates a clock synchronized with this pre-recorded information. . The prerecorded information detection circuit 18 is composed of, for example, a bandpass filter and a PLL, and is configured to obtain a clock synchronized with the prerecorded information extracted from the reproduction signal by the bandpass filter by the PLL.

The CLV control circuit 12 has a local oscillator, and compares the reference signal of a constant frequency generated by the local oscillator with the clock output from the prerecorded information detection circuit 18 in frequency and phase, The rotation of the spindle motor 11 is controlled based on the difference signal.

The absolute address detection circuit 19 is a circuit composed of a biphase mark demodulation circuit and an address decoder. This absolute address detection circuit 19
Performs bi-phase mark demodulation of the pre-recorded information extracted by the pre-recorded information detection circuit 18 and then uses the demodulated pre-recorded information by the address decoder.
The above position information, that is, the absolute address value which is the sector number, is decoded and sent to the controller 20.

The controller 20 is a control device for controlling each section of the present disk recording / reproducing apparatus, and has the following respective functions.

(1) Control of operation / display While receiving a recording / playback instruction from the user via the operation unit 22, the display unit 23 displays the music signal, time information, etc. relating to the recording / playback at any time.

(2) Access control of the optical head 13 Upon receiving the absolute address information (sector value) from the absolute address detection circuit 19, the optical head 13 on the magneto-optical disk 1 is controlled.
While recognizing the position, the optical head moving mechanism (not shown) is moved (accessed) to the predetermined position.

(3) Management of subcode information The subcode information given from the reproduction data processing circuit 31 is recognized. The recognized subcode information is the above TOC.
If it is the contents of the area 1a, the subcode information is set to T
The management information is stored in the OC memory 21, and the management information is read from the TOC memory 21 as necessary.

(4) Management Information Registration At the time of recording, the sector address corresponding to the absolute address information is supplied to the information compression processing circuit 27. Similarly, at the time of recording, the absolute address information corresponding to the main information to be recorded is set to T
It is stored in the OC memory 21 and, if necessary, T
It is read from the OC memory 21 and supplied to the recording data processing circuit 29 as subcode information. By these,
The management information is registered in the TOC area 1a of the magneto-optical disk 1.

(5) Memory Write / Read Control (Write Control Means / Read Control Means) The recording buffer memory 28 is made to read data at a faster speed than data writing. In addition, data writing is performed in block units and intermittent data reading is performed in a plurality of block units. On the other hand, the reproduction buffer memory 32 is caused to read data at a slower speed than data writing. The speed ratio will be described later in detail.

(6) Control of Simultaneous Multiple Recording (Same Information Recording Control Means) The data of a plurality of blocks read from the recording buffer memory 28 is used as the main information area 1b in the magneto-optical disk 1.
Each part is controlled so that it is recorded in a plurality of different areas.

Here, the basic operation of recording and reproducing in the disc recording / reproducing apparatus having the above-mentioned structure will be described with reference to the sequence diagrams of FIGS. 8 and 9.

First, the recording operation will be described. FIG. 8A shows an audio information string input to the information compression processing circuit 27. FIG. 11B shows a compressed audio block (compressed audio information string) written in the recording buffer memory 28. (C) of the figure
Indicates a compressed audio block input to the recording data processing circuit 29 (compressed audio block to be recorded). The hatched portions in (b) and (c) of the same figure show the sections where there is no information transfer.

In the case of normal single information recording, the input terminal 24
The analog audio signal input from is continuous information, and the A / D converter 26 outputs 1.41 Mb.
It is converted into a digital audio signal of ps and becomes an audio information string A ₀ · A ₁ · A ₂ . As shown in (a) of the figure, the audio information sequence A ₀ · A ₁ · A ₂ ...
Corresponding to the blocks described below, the audio information corresponds to about 0.8 seconds, respectively. The amount of information is 44.1 kHz x 16 bits x 2 channels x 0.8 seconds = 1.12896 Mbits = 141.12 kbytes.

These information strings are stored in the information compression processing circuit 27.
By this, since it is compressed to about (1 / 5.5), the compression information is 141.12 kbytes / 5.5≈25.66 kbytes. Further, the above information string is processed by the information compression processing circuit 27, the sector synchronization signal, the sector address information, and the additional sector group (sectors S ₀ · S ₁ · S ₁₃ shown in FIG. 5).
・ S ₁₄ ) and are added. Then, the information sequence is compressed audio blocks B ₀ · B ₁ · B ₂ ... In the recording buffer memory 28 from the time tw ₁ with a slight delay from the time tw _{0 as} shown in FIG. Are sequentially written as.

The compressed audio block B ₀ ·
B ₁ , B _2, ... Are the above-mentioned compressed audio information (25.6).
6 kbytes), sector synchronization signal (12 bytes x 15 sectors), sector address information (4 bytes x 15 sectors), and additional sector (2336 bytes x 4 sectors)
Is added, the total capacity of the block is as follows. 25.66k + (12 × 15) + (4 × 15) + (23
Therefore, the write transfer speed to the recording buffer memory 28 is (35.2 kbytes × 8 bits) /0.8 seconds≈352.36.
It will be 4 kbps.

On the other hand, the compressed audio blocks written in the recording buffer memory 28 are compressed audio blocks B ₀ ′ · B at every writing time tw ₂ tw ₄ ... As shown in (c) of the figure. _It is read as ₁ '... And is input to the recording data processing circuit 29. At this time, the reading speed of the recording buffer memory 28 (corresponding to the transfer speed of the recording information) is 1.41 Mbp, which is the same as that of the conventional CD.
s, which is 1.41 Mbps / 352.4 kbps≅4 times the write transfer rate.

Here, the compressed audio blocks B ₀ ', B ₁ ' ... Are each composed of 15 sectors on the magneto-optical disk 1, and the time per sector is (1/75) seconds as described above. is there. Therefore, the time interval of each compressed audio block B ₀ '· B ₁ ' ... Is (1/75) ×
15 = 0.2 seconds, and the audio block A ₀
· A ₁ · A ₂ ... a time occupied even compared to 0.8 seconds (0.8 / 0.2) = become four times as are consistent with the above transfer rate ratio.

Therefore, the recording operation on the magneto-optical disk 1 is carried out at a time of (1/4) of the time interval of one block of the compressed audio block. Further, the remaining (3/4) time is in the standby state, and thereafter the intermittent recording operation is repeated.

The recording data read from the recording buffer memory 28 is subjected to processing such as EFM modulation before recording by the recording data processing circuit 29, and then the coil driver 1
Given to 5. Then, the coil 14 is driven by the coil driver 15 to apply a magnetic field to the magneto-optical disk 1, so that continuous audio information input from the outside is recorded.

Next, the reproducing operation will be described. FIG. 9A shows a compressed audio block written in the reproduction buffer memory 32. FIG. 11B shows a compressed audio block (audio information string before decompression) input to the information decompression processing circuit 33. FIG. 7C shows an audio information string input to the D / A converter 34. The hatched portions in (a) to (c) of the same figure indicate the sections where there is no information transfer.

The reproduction signal read from the magneto-optical disk 1 by the optical head 13 is subjected to processing such as amplification by the reproduction amplifier 30. The reproduced signal is the reproduced data processing circuit 3
After being subjected to processing such as demodulation in step 1, the compressed audio block is transferred to the reproduction buffer memory 32.

As shown in (a) of the figure, the compressed audio block B ₀ 'between time tr ₀ and time tr _3.
.About.B ₃ 'is written at once in the reproduction buffer memory 32, between the time tr ₃ to time tr ₄ once writing is interrupted. Writing is interrupted here because the capacity of the reproduction buffer memory 32 is almost filled, and FIG. 9 shows a case where the capacity is four blocks for convenience of explanation. The write transfer rate at the time of writing is 1.41 Mbps, which is the same as the read transfer rate of the recording buffer memory 28 at the time of recording.

In parallel with the above writing, FIG.
As shown in, when the writing of the compressed audio block B ₀ ′ ends at the time tr ₁ , the reading of the compressed audio block B ₀ ′ starts immediately. The read transfer speed at this time is the same as the recording buffer memory 2 at the time of recording.
It is 352.4 kbps, which is the same as the write transfer rate of 8.
Therefore, the compressed audio block B ₀ ′ is read as the compressed audio block B ₀ expanded on the time axis.

At time tr ₄ , the compressed audio block B ₀
Since the reading has been completed, a space is created in the reproduction buffer memory 32. Then, as shown in (a) of the same figure, the writing of the compressed audio block B ₄ ′ is continuously performed until time tr ₆ and the reproduction buffer memory 32 is put in the standby state again.

At time tr ₄ , reading of the compressed audio block B ₁ starts. Further, the compressed audio block B ₅ ′ is written from time tr ₇ to time tr ₉ when the reading of the compressed audio block B ₁ is completed. On the other hand, reading of the compressed audio block B ₂ starts at time tr ₇ . After that, such writing and reading are performed in parallel.

By the way, the ratio of the write transfer rate and the read transfer rate for the reproduction buffer memory 32 is 1.41 Mbps / 352.4 kbps≈4 times. Therefore, the reproducing operation from the magneto-optical disc 1 is performed at a time (1/4) of the time interval of the compressed audio block of one block, and
The rest of the time (3/4) is waiting. After that, similarly, each time the reproduction buffer memory 32 becomes vacant, intermittently,
By successively writing the compressed audio blocks from the magneto-optical disk 1 into the reproduction buffer memory 32 and replenishing them, continuous audio information is transferred.

The compressed audio blocks B ₀ , B ₁ , B _2, ... Read out from the reproduction buffer memory 32 are recorded by the information expansion processing circuit 33 in the information compression processing circuit 27.
The decompressing process corresponding to the compressing process is performed, and the uncompressed audio information sequence A ₀ · A ₁ · A ₂ ... Is returned. At this time, the information compression processing circuit 27 outputs the audio information sequence A ₀ · A ₁ · A ₂ ··· to the compressed audio block B ₀ ·.
With a slight processing time delay from the start of reading B ₁ , B _2, ..., They are respectively output at times tr ₂ , tr ₅ , tr _{8 ,} .

Then, the above audio information string A ₀ · A
₁ · A ₂ ... is the D / A converter 34 is converted into an analog audio signal is output from the output terminal 25 to the outside.

Next, an example of the operation of multiple recording of the same information based on the above-described basic operations in the disc recording / reproducing apparatus will be described.

Here, the case of performing the following multi-recording will be described. First, in the main information area 1b of the magneto-optical disc 1, as shown in (a) of FIG. 10, the song T ₁ is recorded first, and further, as shown in (b) of FIG. A song T ₂ α is recorded immediately after the song T ₁ , and a song T ₂ α having the same content as the song T ₂ α is spaced apart from the song T ₂ α.
₂ Record β. In addition, the management information is updated and re-registered at the recording stop stage. In addition, in (a) and (b) of the figure, the left end and the right end are the main information area 1b, respectively.
It corresponds to the innermost circumference and the outermost circumference, and indicates the recording position of the recorded music in the main information area 1b.

While the tune T ₁ is recorded as described above, the management information as shown in Table 1 is read from the TOC area 1a and stored in the TOC memory 21.

[0092]

[Table 1]

Specifically, the song T _{1 with the} song number 01 is added.
Starts from [01:00:00 frame], and starts with [04
Minutes 59 seconds 74 frames]. Here, T ₂ β is recorded from the middle position of the empty area E shown by hatching in FIG. For example, if the maximum recording time of the magneto-optical disk 1 is 60 minutes, the track T ₁ is followed by [05 minutes 00
While recording the song T ₂ α from [00 second frame],
Record the song T ₂ β from [27 minutes 30 seconds 00 frame].

The recording operation as described above will be described below with reference to FIG.
It will be described based on the flowchart of FIG. 1 and with reference to the sequence diagram of FIG.

In FIG. 1, (a) to (c) show the flow of signals relating to the recording operation. (A) in the figure
Is audio information (RA ₀ to the information compression processing circuit 27).
・ RA ₁ ...) is shown. FIG. 3B shows the compressed audio blocks (RB ₀ · RB ₁ ...) Input to the recording buffer memory 28. (C) of the figure
From the recording buffer memory 28 to the recording data processing circuit 2
Compressed audio block (RB ₀ 'R
B ₁ '...) is shown. Further, (d) of the figure shows the operation of the optical head 13.

In the following operation example, the processing time delay in the information compression processing circuit 27 will be omitted for convenience. Further, the recording buffer memory 28 here has a capacity capable of storing at least 5 compressed audio blocks.

[1] Recording of song T ₂ α When the user gives a multi-recording instruction to the controller 20 through the operation unit 22, the multi-recording operation starts. First, the controller 20 causes the address corresponding to the first recording block (hereinafter, simply referred to as the first address) Ar.
₁ is set (S1), and a second recording block applicable address (hereinafter, simply referred to as a second address) Ar ₂ is obtained and set (S2).

Specifically, the first address Ar ₁ is set to the head of the empty area E [05 minutes 00 seconds 00 frame]. The empty area E is determined based on the management information in the TOC memory 21. Further, when the maximum recording time of the magneto-optical disk 1 is 60 minutes, the second address Ar ₂ is set as the intermediate position of the empty area E and the music T ₂ β.
Is set to [27 minutes 30 seconds 00 frames], which is the recording start position. The first and second addresses A here
r ₁ · Ar ₂ indicates the head absolute address of each compressed audio block to be recorded.

Then, according to an instruction from the controller 20,
Data writing to the recording buffer memory 28 starts (S3). As a result, the optical head 13 accesses the position of the first address Ar ₁ , that is, the head of the recording position of the song T ₂ α (S4), and four compressed audio blocks are written in the recording buffer memory 28. (S5). When the writing is finished, it is written 4
The compressed audio block for the block is read from the recording buffer memory 28 and given to the recording data processing circuit 29, and recording of the piece of music T ₂ α is performed from the first address Ar ₁ (S6).

The completion of writing of four blocks in S5 can be determined by the relationship of the sector address information sequentially given to the information compression processing circuit 27 by the controller 20 for each sector.

The above operation corresponds to FIG. 1 and is as follows.

<< Operation of S3 >> As shown in (b) of the figure, writing from the recording buffer memory 28 starts at time t ₀ .

<< Operation of S4 >> As shown in (d) of the figure, the optical head 13 moves to the position of [05:00:00 frame] and waits for an access operation.

<< Operation of S5 >> As shown in (b) of the figure, when the writing of the compressed audio blocks RB _{0 to} RB ₃ for 4 blocks is completed at the time t ₄ , the operation in (c) of the figure is performed. As shown, the four blocks are compressed audio blocks RB ₀ ′ -from time t ₄ to time t _5.
Read as RB ₃ '. Recording of these compressed audio blocks RB ₀ ′ to RB ₃ ′ is performed by applying a magnetic field to the coil 14 and irradiating light from the optical head 13.

[2] Recording of song T ₂ β When recording of the first four blocks of song T ₂ α is completed, the first address Ar ₁ is updated (S7). Here, S
Since 6 blocks have already been recorded by 6, the new first address Ar ₁ is a value obtained by adding 4 blocks to the current value of the first address Ar ₁ , that is, (15 × 4) = 60 sectors. It is said that Therefore, the updated first address Ar ₁ is [05 minutes 00 seconds 60 frames] with 60 sectors added to [05 minutes 00 seconds 00 frames].

Further, the access operation of the optical head 13 to the position of the second address Ar ₂ is performed (S8). Thereafter, four blocks of compressed audio blocks are read again from the recording buffer memory 28, and these four blocks are recorded as the song T ₂ β in the same manner as described above (S
9).

The above operation corresponds to FIG. 1 and is as follows.

<< Operation of S8 >> As shown in (d) of the figure, the optical head 13 moves to the position of [27 minutes 30:00 frame] at the time t ₅ and performs an access operation for waiting. .

<< Operation of S9 >> (c) and (d) of FIG.
At time t ₆ when the above access operation is completed,
From time t ₇ to time t ₇ , the compressed audio block RB ₀ ′-
Reading and recording of RB ₃ 'are simultaneously performed.

[3] Recording of Management Information When the recording of the first 4 blocks of the music piece T ₂ β is completed, the second address Ar ₂ is updated (S10). here,
As a result of S9, since four blocks have already been recorded, the new second address Ar ₂ is set to a value obtained by adding four blocks, that is, 60 sectors, to the current value of the second address Ar ₂ . Therefore, the updated second address Ar
₂ is [27 minutes 30 seconds 60 frames] with 60 sectors added to [27 minutes 30 seconds 00 frames].

Then, the controller 20 determines whether or not there is a recording operation stop instruction given from the operation unit 22 (S11). Here, if there is no recording stop instruction, the process returns to S4, and the above-described operations from S4 to S10 are repeated. As a result, by the intermittent recording operation with the access operation of the optical head 13 in between, the same song T ₂ α ·
T ₂ β is overrecorded in different areas in the main information area 1b.

On the other hand, when there is a recording stop instruction in S11, the recording start and recording end absolute address position information corresponding to the tune T ₂ α · T ₂ β recorded as described above is set to TO.
It is updated (added) in the C memory 21 (S12). After the optical head 13 makes an access operation to the TOC area 1a (S13), the contents of the TOC memory 21 are recorded in the TOC area 1a as new management information (S14), and a series of operations is completed.

Song T ₂ α · T recorded as described above
_When reproducing 2β, the normal reproduction operation described above is executed. At this time, the song T ₂ α or the song T ₂ β to be reproduced
By designating the music piece number attached to the operation section 22, the desired music piece T ₂ α or music piece T ₂ β is reproduced based on the management information corresponding to the music piece number.

Here, as a result of the above-described overdubbing, on the magneto-optical disk 1, the same piece of music T ₂ α is recorded in two places.
・ T ₂ β is recorded, but if it is not necessary, it may be erased after confirmation of listening according to a user's instruction, or may be left as it is as backup content. In the case of storing as backup content, for example, when the normally recorded song T ₂ α cannot be normally played back due to dust adhering to the magneto-optical disc 1, the song T ₂ β can be played back.

In the operation example of the above-described multi-recording, the minimum unit of intermittent recording is 4 of compressed audio blocks.
Since it is divided into blocks, it is set that the access operation of the optical head 13 in S4 and S5 should be completed within 1.6 seconds which is a time interval of two blocks of audio blocks before compression. This is the time t ₅ · at which the optical head 13 should perform the access operation, as shown in FIG.
The total time between t ₆ and times t ₇ and t ₈ is 1.
This is because it corresponds to 6 seconds.

However, when the multiple recording function is applied to a system having poor access performance, there is a possibility that multiple recording cannot be performed. On the other hand, by increasing the storage capacity of the recording buffer memory 28, even if the time required for the access operation becomes long, it is possible to carry out the multiplex recording as in the system having the normal access performance.

In the above operation example, when a recording operation stop instruction is issued in S11, the recording operation is immediately stopped, but an unrecorded compressed audio block held in the recording buffer memory 28 is recorded. After that, the operation of S12 may be performed. Furthermore, in this embodiment,
I try to record the same song in two different places,
It is also possible to record the same song in three or more places. In this case, this can be dealt with by increasing the storage capacity of the recording buffer memory 28 or changing the transfer speed ratio at the time of writing and reading of the recording buffer memory 28.

As described above, in the disc recording / reproducing apparatus of the present embodiment, the recording buffer memory 28 is used to intermittently record the compressed audio block, and
One song is recorded on two different locations on the magneto-optical disc 1. Therefore, even if one of the music pieces cannot be reproduced normally, by reproducing the other music piece, it is possible to avoid the situation that the reproduction becomes impossible.

[Embodiment 2] A second embodiment in which the present invention is applied to a disc recording / reproducing apparatus will be described below with reference to FIGS. 2 and 12 to 15. In addition, in the present embodiment, constituent elements having the same functions as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Further, since the data format regarding recording / reproduction is similar to that described in the first embodiment, the description thereof will be omitted for convenience.

As shown in FIG. 12, the disc recording / reproducing apparatus according to this embodiment includes a recording system processing section 41, a reproduction system processing section 17, a prerecorded information detection circuit 18, an absolute address detection circuit 19, and Controller 42 and TOC memory 2
1, the operation unit 22, the display unit 23, the input terminal 43.4
4 and an output terminal 25.

The recording system processor 41 includes a first A / D converter 45, a second A / D converter 46, a first information compression processing circuit 47, a second information compression processing circuit 48, a first recording buffer memory 49, and a first recording buffer memory 49. A recording buffer memory 50, a switching circuit 51, and a recording data processing circuit 29 are provided.

The first A / D converter 45 and the second A / D converter 46 convert the analog audio signal (music information) input from the input terminals 43 and 44, respectively, into a sampling frequency of 44.1 kHz and a quantization bit number. 16 is a circuit for converting into a digital signal.

The first information compression processing circuit 47 and the second information compression processing circuit 48 are respectively the first A / D converter 45.
The digital signal output from the second A / D converter 46 and the digital signal output from the second A / D converter 46 are converted into the information compression processing circuit 2 in the first embodiment.
7 (see FIG. 7).

The first recording buffer memory 49 and the second recording buffer memory 50 as the storage means for each information are provided with a first information compression processing circuit 47 and a second information compression processing circuit 4, respectively.
8 is a semiconductor memory for temporarily storing the compressed audio blocks from 8 and. Under the control of the controller 42, the first and second recording buffer memories 49 and 50 sequentially write the compressed audio blocks at the write transfer rate transferred from the first and second information compression processing circuits 47 and 48. At the same time, the read transfer speed is four times the write transfer speed.

The switching circuit 51 is a circuit for selecting a compressed audio block read from the first recording buffer memory 49 and the second recording buffer memory 50 and outputting it to the recording data processing circuit 29.

The controller 42 is a control device for controlling each part of the present disk recording / reproducing apparatus, and includes (1) of the controller 20 (see FIG. 7) in the first embodiment.
Each of the functions (2) and (3) and the following functions are provided.

(1) Management Information Registration At the time of recording, the sector address corresponding to the absolute address information is supplied to the first information compression processing circuit 47 and / or the second information compression processing circuit 48. Similarly, at the time of recording, the absolute address information corresponding to the main information to be recorded is stored in the TOC memory 21 and is read out as needed to be supplied as subcode information to the recording data processing circuit 29. By these, T of the magneto-optical disk 1 shown in FIG.
The management information is registered in the OC area 1a.

(2) Memory write / read control (storage control means / read control means) For the first and second recording buffer memories 49 and 50,
Makes data reading faster than data writing. In addition, data writing is performed in block units and intermittent data reading is performed in a plurality of block units.
On the other hand, the reproduction buffer memory 32 is caused to read data at a slower speed than data writing. The write / read speed ratio is the same as the speed ratio in the first embodiment.

(3) Control of Simultaneous Parallel Recording (Different Information Recording Control Means) Block-unit data read from the first and second recording buffer memories 49 and 50 is stored in the main information area 1b of the magneto-optical disk 1. Each unit is controlled so as to record in a plurality of different areas.

An example of the operation of simultaneous parallel recording of different information will be described. Here, the case of performing the following parallel recording will be described. First, in the main information area 1b of the magneto-optical disk 1, as shown in (a) of FIG. 13, the song T ₁ is recorded first, and further, as shown in (b) of FIG. Immediately after the song T ₁ , a different song T ₂ · T
Record ₃ simultaneously. The song T ₂ is audio information input from the input terminal 43, and the song T ₃ is audio information input from the input terminal 44. In addition, the management information is updated and re-registered at the recording stop stage. In addition, in (a) and (b) of the figure, the left end and the right end respectively correspond to the innermost circumference and the outermost circumference of the main information area 1b, and show the recording position of the recorded music in the main information area 1b. ing.

The song T ₁ is [01 minutes 00 seconds 00 frames]
Starts from and ends at [04:59:74 frames]. Here, the song T ₂ as the new first recording is changed to the song T ₁
It is assumed that recording is started from [05:00:00 frame], and a new song T ₃ is recorded from [12:00:00 frame] as the second recording. Position music T ₃ is recorded is set in advance according to the recording time of the song T ₂ at the time of recording tracks T _2, is input by the user from the operation unit 22. That is, when [07 minutes 00 seconds] is given as the scheduled recording time of the song T ₂ , [12 minutes 00:00 frame] is obtained as the scheduled recording position of the song T ₃ .

The recording operation as described above will be described below with reference to FIG.
It will be described based on the flowchart of FIG. 9 and also with reference to the sequence diagram of FIG.

In FIG. 15, (a) to (c) are
The signal flow relating to the recording operation of the song T ₂ is shown, and (d) to (f) show the signal flow relating to the recording operation of the song T ₃ .

FIG. 10A shows the first information compression processing circuit 4
7 shows the input of the first audio information (RA ₀ · RA ₁ ...) To 7. In the same figure, (b) shows a compressed audio block (RB ₀ ···) input to the first recording buffer memory 49.
Shows the RB ₁ ...). (C) of the same figure shows a compressed audio block (RB ₀ ′ · RB ₁ ′ ...) Inputted from the first recording buffer memory 49 to the switching circuit 51.

FIG. 10D shows the second information compression processing circuit 4
8 shows the input of the second audio information (RD ₀ · RD ₁ ...). (E) of the figure shows a compressed audio block (RE _0.
RE ₁ ...) is shown. (F) of the figure shows a compressed audio block (RE ₀ '/ RE ₁ ' ...) Inputted from the second recording buffer memory 50 to the switching circuit 51.

Further, (g) in the figure shows the output of the switching circuit 51, and (h) in the figure shows the operation of the optical head 13.

In the following operation example, it is assumed that the first and second recording buffer memories 49 and 50 have a capacity capable of storing at least 5 compressed audio blocks. Further, for the sake of easy understanding of the explanation, it is assumed that the recording operations of the songs T ₂ and T ₃ start at the same time and end at the same time.

[1] Recording of song T _{2 When} a simultaneous and parallel recording instruction from the user is given to the controller 42 by the operation unit 22, the simultaneous and parallel recording operation is started. First, the controller 42 sets the first address Ar ₁ (S21). Here, the first address Ar ₁ is set to [05 minutes 00 seconds 00 frames], which is the head of the empty area E determined by the TOC memory 21. Then, according to an instruction from the controller 42, writing of the compressed audio block to the first recording buffer memory 49 is started (S22).

After waiting for the above writing for two blocks (S23), the second address Ar ₂ is obtained and set (S24). That is, as described above, the song T
The recording start address of ₂ is the time required for the song T ₃ [07
The address of [12 minutes 00 seconds 00 frame] obtained by adding minutes 00 seconds] is set as the second address Ar ₂ . Then, according to an instruction from the controller 42, writing of the compressed audio block to the second recording buffer memory 50 is started (S25).

Thereafter, the access operation of the optical head 13 is performed to the position of the first address Ar ₁ , that is, the recording start position of the song T ₂ (S26). Then, it is recognized that the writing of the compressed audio blocks for four blocks has been completed in the first recording buffer memory 49 (S27). Then, the compressed audio blocks for the four blocks are read from the first recording buffer memory 49 and given to the recording data processing circuit 29 via the switching circuit 51 to record the song T ₂ from the first address Ar _1. It is implemented (S28).

The above operation corresponds to FIG. 15 and is as follows.

<< Operation of S22 >> As shown in (b) of the figure, writing from the first recording buffer memory 49 starts from time mt ₀ .

<< Operations of S23 to S25 >> As shown in (e) of the same figure, from the time mt ₂ to the second recording buffer memory 5
Writing 0 starts.

<< Operation of S26 >> As shown in (g) of the same figure, the optical head 13 moves to the position of [05 minutes 00 seconds 00 frames] and stands by between time mt ₂ and time mt _4. Perform access operation.

<< Operation of S27 >> As shown in (b) of the figure, when the writing of the compressed audio blocks RB _{0 to} RB ₃ for 4 blocks is completed at the time mt ₄ , (c) of the figure is shown. As shown, the four blocks are time mt ₄
From time to mt ₅ compressed audio block RB
It is read as _{0 '~RB 3'.} Then, the recording of these compressed audio blocks RB ₀ 'to RB ₃ ',
The magnetic field is applied to the coil 14 and the light is emitted from the optical head 13.

[2] Recording of music T _{3 When} recording of the first 4 blocks of music T ₂ is completed, the first recording
The address Ar ₁ is updated (S29). Here, S
Since 28 blocks have already recorded 4 blocks, the new first address Ar ₁ is a value obtained by adding 4 blocks to the current value of the first address Ar ₁ , that is, (15 × 4) = 60 sectors. It is said that Therefore, the updated first address Ar ₁ is [05:00 minutes 60 frames].

When the optical head 13 accesses the position of the second address Ar ₂ (S30), writing of four compressed audio blocks to the second recording buffer memory 50 is recognized (S31). ). Then, the compressed audio blocks for the four blocks are read from the second recording buffer memory 50, and the four blocks are read from the second address Ar ₂ to the song T in the same manner as described above.
_It is recorded as ₃ (S32).

The above operation corresponds to FIG. 15 and is as follows.

<< Operation of S30 >> As shown in (h) of the same figure, the optical head 13 moves to the position of [12:00:00 frame] and stands by between time mt ₅ and time mt _6. Perform access operation.

<< Operation of S32 >> As shown in (f) and (h) of the figure, from time mt ₆ to time mt ₇ ,
Reading and recording of the compressed audio blocks RE ₀ ′ to RE ₃ ′ are performed simultaneously.

[3] Recording of management information When recording of the first 4 blocks of the music T ₃ is completed, the second recording
The address Ar ₂ is updated (S33). Here, S
Since 32 blocks have already been recorded by 32, the new second address Ar ₂ is a value obtained by adding 4 blocks, that is, 60 sectors, to the current value of the second address Ar ₂ . Therefore, the updated second address Ar
₂ is [12 minutes 00 seconds 60 frames] with 60 sectors added to [12 minutes 00 seconds 00 frames].

Then, the controller 42 determines whether or not there is a stop instruction accompanying the end of the scheduled recording time ([07 minutes 00 seconds]) or a stop instruction of the recording operation given from the operation unit 22. (S34). here,
If there is no recording stop instruction, the process returns to S26 and the above S26 is performed.
The operations from to S33 are repeated. As a result, different songs T ₂ and T ₃ are simultaneously recorded in parallel in different areas of the main information area 1b by the intermittent recording operation with the access operation of the optical head 13 in between.

On the other hand, if there is a recording stop instruction in S34, the recording start and recording end absolute address position information corresponding to the music pieces T ₂ and T ₃ recorded as described above are updated (added) in the TOC memory 21. (S35). Optical head 13
After accessing the TOC area 1a (S3
6) Then, the contents of the TOC memory 21 are recorded in the TOC area 1a as new management information (S37), and a series of operations is completed.

Songs T ₂ and T ₃ recorded as described above
When reproducing, the normal reproducing operation described in the first embodiment is executed. At this time, by designating the tune number attached to the tune T ₂ or the tune T ₃ to be reproduced by the operation unit 22, the desired tune T ₂ or the tune T ₃ is reproduced based on the management information corresponding to the tune number. Done.

As described above, in the disc recording / reproducing apparatus of this embodiment, the first and second recording buffer memories 4 are
By intermittently recording compressed audio blocks using the 9.50, different songs are recorded in two different locations on the magneto-optical disk 1. Therefore, for example, when it is necessary to record the FM broadcast song while recording the CD song, both songs can be recorded at the same time.

Further, according to the present embodiment and the above-described first embodiment, the read operation of the recording buffer memory is performed at a transfer speed faster than the write operation, so that the optical head 13 except the time required for recording in the real time of continuous information. Can be assigned to the time to operate the access. As a result, a single optical head 13 can record a plurality of pieces of the same continuous information, and the structure of the disc recording / reproducing apparatus can be prevented from becoming complicated.

In the present embodiment, the song T
_Although an example in which the recording operation of ₂ · T ₃ is started and ended at the same time has been described, it is possible to record three or more pieces of music at the same time by adding an information compression processing circuit and a recording buffer memory.

Further, in the present embodiment and the above-mentioned first embodiment, an example in which the CD format is used as a basis and it is applied has been described, but the present invention is not limited to such a format. That is, it goes without saying that the block configuration and the sector configuration can take various forms, and the address information can also take various forms. Moreover, it goes without saying that the present invention can be applied to the case of handling not only audio information but also image information and other visual or auditory continuous information.

Furthermore, in the present embodiment, an example using compressed audio information has been described, but the present invention is not limited to this, and basically, the writing side and the reading side of the buffer memory are described above. If there is a difference in the information transfer speed as described above, it can be applied in various forms. For example, taking the above CD format as an example, the conventional CD audio information that is not compressed (sampling frequency: 44.1 kHz by increasing the linear velocity of the disc than usual) is used.
z, 16 quantization bits, and 2) the number of channels can be applied as they are.

The present invention can be implemented not only in an optical disk device used as an external storage device for a computer, but also in a hard disk device, a floppy disk device, and a magnetic tape recording device without departing from the spirit of the present invention. .

[0161]

As described above, the information recording / reproducing apparatus of the present invention stores the continuous information in the storage means and the continuous information in the storage means for each block divided into a predetermined size at the write transfer speed. Storage control means for causing the continuous information stored in the storage means to be intermittently read from the storage means at a read transfer rate higher than the write transfer rate for each of a plurality of blocks, and by the control of the read control means. The same information recording control means is provided for recording the read information in a plurality of different areas on the recording medium each time it is read.

As a result, since the read transfer speed is faster than the write transfer speed in writing and reading in the storage means, the read continuous information is compressed on the time axis as compared with the original state, and apparently. The continuous information will be recorded multiple times in real time. In this way, by making the transfer rates at the time of writing and reading at the storage means different, it is possible to record a plurality of the same continuous information on a single recording medium without adding any complicated structure. Moreover, since the time required for recording is shortened by increasing the transfer speed at the time of reading, a new time is required for the head to perform the access operation, and it becomes possible to perform the above recording with a single head. .

Therefore, when the continuous information is recorded in a certain area of the recording medium, even if the continuous information is not normally recorded due to the influence of vibration or the like, the defect of the recording medium, etc. Normal recorded contents can be selected and reproduced from the same continuous information recorded in the area. In particular, F
When recording a recording source that cannot be held at hand, such as M broadcasting, it is possible to avoid the failure of recording due to the above abnormality.

Therefore, according to the above configuration, the information recording / reproducing apparatus capable of simultaneously recording the same information on the same recording medium can be provided at a low cost and with a simple structure.

As described above, the other information recording / reproducing apparatus of the present invention comprises the information-based storage means for individually storing the continuous information,
Information-based storage control means for storing a plurality of pieces of continuous information in the information-based storage means for each block divided into a predetermined size at the write transfer speed, and each piece of continuous information stored in the information-based storage means Information-based read control means for intermittently reading from the separate storage means for each of a plurality of blocks at a read transfer speed higher than the write transfer speed, and information read by the control of the information-based read control means for each read And a different information recording control means for recording in different areas on the recording medium.

As a result, the read transfer speed is faster than the above write transfer speed, so that each piece of read continuous information is compressed on the time axis as compared to the original state, and the apparent continuous information is actually transmitted. It will be recorded in parallel in time. In this way, by making the transfer rates at the time of writing and reading at the information-by-information storage means different, the same continuous recording can be performed on a single recording medium without adding any complicated structure, like the above-mentioned information recording / reproducing apparatus. A plurality of pieces of information can be recorded, and such recording can be performed by a single head.

As a result, when a request to record another piece of continuous information is made while recording certain pieces of continuous information, the pieces of continuous information can be recorded in parallel. For example, while performing dubbing from a CD, F
When it becomes necessary to record the M broadcast, the FM broadcast can be recorded in parallel with the dubbing from the CD.

Therefore, according to the above configuration, the information recording / reproducing apparatus capable of simultaneously recording different information on the same recording medium can be provided at a low cost and with a simple configuration.

[Brief description of drawings]

FIG. 1 is a sequence diagram showing an operation when performing simultaneous multiple recording of the same music information in a disc recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a magneto-optical disk commonly used in the disk recording / reproducing apparatus according to the first and second embodiments of the present invention.

FIG. 3 is an enlarged view showing a detailed structure of a recording surface of the magneto-optical disk of FIG.

FIG. 4 is an explanatory diagram showing a format of a main data field in a recording / reproducing system adopted in the disc recording / reproducing apparatus in the first example of the present invention.

FIG. 5 is an explanatory diagram showing a block format in a recording / reproducing system adopted in the disc recording / reproducing apparatus in the first example of the present invention.

FIG. 6 is an explanatory diagram showing an arrangement of blocks used for actual music information.

FIG. 7 is a block diagram showing a schematic configuration of a disc recording / reproducing apparatus according to the first embodiment of the present invention.

8 is a sequence diagram showing a basic recording operation of the disc recording / reproducing apparatus of FIG. 7. FIG.

9 is a sequence diagram showing a basic reproducing operation of the disc recording / reproducing apparatus of FIG.

10 is an explanatory diagram showing an arrangement example of music information when performing simultaneous multiplex recording in the disc recording / reproducing apparatus of FIG. 7. FIG.

11 is a flowchart showing an operation procedure when multiple recording of the same music information is performed in the disc recording / reproducing apparatus of FIG.

FIG. 12 is a block diagram showing a schematic configuration of a disc recording / reproducing apparatus according to a second embodiment of the present invention.

13 is an explanatory diagram showing an arrangement example of music information when performing simultaneous parallel recording in the disc recording / reproducing apparatus of FIG.

14 is a flowchart showing an operation procedure when performing simultaneous and parallel recording of different music information in the disc recording / reproducing apparatus of FIG.

15 is a sequence diagram showing an operation when simultaneously recording different music information in parallel in the disc recording / reproducing apparatus of FIG.

FIG. 16 is a plan view showing a conventional compact disc.

17 is an explanatory diagram showing a format of a frame signal in the compact disc of FIG.

FIG. 18 is an explanatory diagram showing a sector format in the compact disc of FIG. 16.

[Description of Reference Signs] 1 magneto-optical disk (recording medium) 1b main information area 20 controller (writing control means, reading control means,
Identical information recording control means) 28 recording buffer memory (storage means) 42 controller (information-based write control means, information-based read control means, different information recording control means) 49 first buffer memory (information-based storage means) 50 second Buffer memory (information storage means) 51 switching circuit

Claims (2)

[Claims] 1. An information recording / reproducing apparatus for recording / reproducing continuous information on / from a recording medium based on absolute address information, a storage means for storing the continuous information, and a predetermined transfer rate for writing the continuous information in the storage means. Storage control means for writing the data into each of the blocks divided into a plurality of blocks, and the continuous information stored in the storage means is intermittently read from the storage means for each of a plurality of blocks at a read transfer speed higher than the write transfer speed. And a same information recording control means for recording the information read by the control of the read control means in a plurality of different areas on the recording medium for each read. Recording / playback device. 2. An information recording / reproducing apparatus for recording / reproducing continuous information on / from a recording medium based on absolute address information, and a storage means for storing continuous information individually, and a plurality of storage pieces for storing continuous information by the information. The information-based storage control means for storing in the means for each block divided into a predetermined size at the write-transfer speed, and the continuous information stored in the information-based storage means from the information-based storage means based on the write transfer speed. Information-based read control means for intermittently reading a plurality of blocks at a high read transfer rate, and information read by the control of the information-based read control means is recorded in different areas on the recording medium for each read. An information recording / reproducing apparatus comprising: different information recording control means.