JP2880377B2 - Information recording / reproducing device - Google Patents

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 using a recording medium on which a digitized audio signal or the like can be arbitrarily recorded, for example, a recordable optical disk.

[0002]

2. Description of the Related Art Conventionally, compact discs (hereinafter referred to as "CDs") in which continuous information such as music information is recorded as digital signals by minute pits which can be detected optically have been widely used. The CD is reproduced by a CD player as an optical disk reproducing apparatus exclusively for reproduction.

As shown in FIG. 12, a signal format used in a CD is such that one frame 101a of a recording signal is
It is composed of a frame synchronization signal 101b indicating the beginning of a frame, a subcode 101c indicating additional information of data, and a data field 101d obtained by adding an error detection and correction parity code to 24-byte data as main information. ing. The data field 101
d is CIRC (Cross Interleaved Reed Solomon Code
), Which is an error detection and correction system that combines incomplete interleaving.

As shown in FIG. 13, the sub-code 101c has 98 sub-frames 101a and forms one sub-coding frame 102c (hereinafter referred to as "sector"), and has a track number (main information is music information). Is called a song number) and absolute address information on the disc. Since the sector length is (1/75) second, it is 1 second in 75 sectors, and the sector number is minute: second: frame information (the frame is in 75 base).
The time information and the position information continuously increase sequentially from the innermost circumference of the disk. Further, the data field 102d in the sector has 2352
It is composed of byte main data and 784-byte parity.
According to the format, the sampling frequency is 44.1 kHz,
Since the quantization is a 16-bit straight line and the number of channels is 2 (stereo), the number of data per second is (44.1 kHz × 16 × 2) = 1.4112 Mbits = 176.4 kbytes. The number of data per sector is (176.4 kbytes / 75) = 2352 bytes, and is allocated as the main data.

As shown in FIG. 11, the area arrangement of the disc 100a in the CD includes a main information recording area 100c including main information such as music information and a sector number according to the subcode, and a main information recording area 100c. Additional information about each recorded main information, for example, each track number and a recording start sector number of each track, and information identifying whether the track is audio information such as music or data for a computer are indicated by subcodes. (Table Of Contents) area 100b.

[0006] In the CD player, the TOC area 100 is loaded when a disc is loaded.
By reading the sub-code information b, the number of each piece of main information (corresponding to the number of songs in the case of music information), the sector number of the recording start position thereof, and the type of information (audio or data) are recognized. In response to the reproduction instruction, the reproduction of a desired track is promptly executed with an access operation by comparing the information of the TOC area 100b with the sector number by the subcode of the main information recording area 100c.

Since these CDs are recorded at a constant linear velocity during recording, that is, a so-called CLV (Constant Linear Velocity) method, the recording density is constant at any position on the disk, and the recording capacity is improved. Actual CD
In the player, the CLV
CLV control is executed by controlling the rotation of the disk so that the interval between the recorded reproduction signals of the CD, for example, the frame synchronization signal becomes the reference length.

On the other hand, when recording and using various information such as music information and computer information on a rewritable disk such as a magneto-optical disk which has been recently developed,
It is desirable to provide a compatible disc recording / reproducing apparatus by sharing a reproducing method with a conventional CD.

In this case, in particular, in an initial disk on which no information is recorded, absolute address information using a subcode according to the signal format of the CD and CLV
Since there is no frame synchronization signal or the like used for the control, an access operation to an arbitrary sector position prior to the recording and a necessary CLV control during the recording cannot be performed.
Therefore, as an absolute address recording method equivalent to the absolute address information by the sub-code, after the absolute address is bi-phase mark modulated, the guide groove of the optical disk is moved in the disk radial direction according to whether each bit is "1" or "0". There has been proposed one that is deflected inward or outward or that changes the width of the guide groove (Japanese Patent Application Laid-Open No. 64-39632).
No.). In that case, the frequency band of the absolute address by the byte phase mark modulation and the EFM (Eight to Four)
teen Modulation) If it is different from the frequency band of the recording information by modulation, it is possible to reproduce them separately from each other, and use the above absolute address using the guide groove even for the area where there is no recording information. Access operation is possible. Also, for the CLV control, accurate CLV control is possible by using the reproduced carrier component of the absolute address, and the same can be performed during recording.

[0010]

However, in the conventional information recording / reproducing apparatus using the rewritable disk, the recording / reproducing apparatus is similar to a tape recorder using a compact cassette or the like which is a general consumer information recording / reproducing apparatus. Since the recording function is exclusively used during the recording, if the user wants to reproduce the recorded contents, the recording can be performed only after the recording is completed, and the recorded contents cannot be reproduced during the recording. For example, if the user wants to listen to the FM broadcast program from 7:00 to 8:00 pm, but cannot listen to it at home at that time and cannot listen to the program, the user can make a timer reservation and record, and listen later. If you return home at 15:00,
If you want to listen to the FM broadcast program from the beginning after returning home, and want to listen to it from the beginning at 7:00 pm, you can only listen to it after 8:00 pm when recording ends.

Further, for example, when listening to an FM broadcast and there is a visitor or the like and the listening is interrupted, the recording may be started at that time so as not to miss the broadcast contents during the interruption.
At the time when the business of the visitor etc. is completed in a short time and the listening is continued again, the broadcast content during the interruption cannot be immediately heard, and it must be done after the recording to the end of the program to be listened to has been completed. For example, it is not possible to perform continuous listening even during the interruption.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to be able to immediately reproduce already recorded contents even during recording,
It is another object of the present invention to provide an information recording / reproducing apparatus which can improve operability.

[0013]

In order to solve the above-mentioned problems, the information recording / reproducing apparatus according to the first aspect of the present invention performs a compression process on main information input from the outside, and intermittently stores the information in a recording medium. Recording means for performing recording, reproducing means for intermittently reading main information on the recording medium, performing expansion processing and reproducing the same, and first input means for inputting a main information recording instruction to the recording medium, The main information reproduction instruction to the recording medium or the main
Second input means for inputting an information reproduction interruption instruction ;
After the main information recording instruction is issued from the first input means,
When the main information reproduction instruction is input from the second input means, during the intermittent recording of the main information on the recording medium,
The recorded main information is read out intermittently by the reproducing means in parallel with the recording.
The main information reproduction interruption instruction is input from the second input means.
At the time, the intermittent recording of the main information on the recording medium was performed.
The reading of the main information by the playback means is interrupted.
Input of a main information reproduction instruction from the second input means thereafter.
Reading the main information from the arbitrary position
It is characterized in that the control means Ru is continued out look is provided.

According to a second aspect of the present invention, there is provided an information recording / reproducing apparatus according to the first aspect of the present invention, wherein the first input means is provided with a preset recording start time. serial, which instructs start of record in accordance with the time
A recording time indicating means is provided.

According to a third aspect of the present invention, there is provided an information recording / reproducing apparatus according to the first aspect of the present invention, wherein the second input means instructs a reproduction start time. Playback time indicating means for
Wherein the control means is provided with an arithmetic means for obtaining a reproduction start absolute address value of a corresponding recording medium in accordance with the time designated by the reproduction time designation means. I have.

According to a fourth aspect of the present invention, there is provided an information recording / reproducing apparatus according to the first aspect, wherein the first input means is externally input together with main information. External information input means for instructing external recording of main information on a recording medium based on the recording instruction information.

The information recording and reproducing apparatus of the fifth aspect of the present invention, in order to solve the above problems, an information recording reproducing apparatus according to claim 1, wherein, in the above-mentioned control means, recorded in a predetermined area on the recording medium A repetition means for sequentially repeating recording by the means and reproduction by the reproduction means is provided.

[0018]

According to the configuration of the first aspect, based on the main information recording instruction input from the first input means, the control means performs a compression process on the main information input from the outside to the recording means and records it. Intermittent recording on the medium. The control means reproduces the contents already recorded on the recording medium based on the main information reproduction instruction input from the second input means in parallel with the intermittent recording on the recording medium by the recording means. By means,
The main information on the recording medium is intermittently read, the main information is subjected to a decompression process, and output to the outside. In addition, the control
The second input means is provided for reproducing the main information during recording.
When the main information playback stop instruction is input from the
While recording the main information, the main information
Interrupts the reading of information only, and then from the second input means
When the main information reproduction instruction is input, the reproduction unit starts from an arbitrary position.
The reading of the main information is continued.

As a result, even during recording, it is possible to immediately reproduce the already recorded contents.
Furthermore, while the recording and reproduction of the main information are being performed at the same time,
Easy to interrupt or continue playback operation only
Therefore, even if the reproduction of the main information is interrupted,
Perform continuous playback without interruption without performing troublesome operations
Can be

According to the second aspect of the present invention, the first input means is provided with the recording time instructing means for instructing the start of the recording in accordance with the preset recording start time. The recording time instructing means automatically issues a recording start instruction in accordance with the recording start time without having to input the information by the first input means. Thereby, the operability can be improved.

According to the third aspect of the present invention, the second input means is provided with the reproduction time instructing means for instructing the reproduction start time, whereby the reproduction is automatically performed at the predetermined time. It is possible to do. In addition, the control
The stage computing means is provided with, at the time of reproduction, the Starring <br/> calculation means, so obtaining the reproduction start absolute address value of the recording medium in question corresponding to the designated time, the time desired Can be reproduced. Thereby, the operability can be improved.

According to the fourth aspect of the present invention, the first input means includes an external information input means for instructing external recording of main information on a recording medium based on recording instruction information input together with external main information. Is provided, so that, without having to manually input directly, together with main information input from the outside,
By made to contain the main information recording instruction from the outside to the recording medium, it instructs the main information recording to automatically recording medium, thereby, can be recorded on the recording medium. Thereby, the operability can be improved.

According to the fifth aspect of the present invention, the control means controls the recording and reproduction by the recording means within a predetermined area on the recording medium.
Since the repetition means for sequentially repeating the reproduction by the generation means is provided, desired information can be sequentially recorded and reproduced repeatedly. Thereby, the operability can be improved.

[0024]

1 to 1 show an embodiment of the present invention.
The following is a description based on 0. In this embodiment, for example, a disc recording / reproducing apparatus using a rewritable disc will be described.

Magneto-optical disk 1 as a rewritable optical disk used in the information recording / reproducing apparatus of this embodiment
As shown in FIG. 2, a TOC (Table Of Contents) area 1a, which is a management information area, is provided at an inner peripheral end thereof, and most of the area outside the TOC area 1a is a main information area 1b. Has become. Music information is recorded in the main information area 1b, while the main information area 1 is recorded in the TOC area 1a.
Additional information on each piece of information recorded in b, for example, a song number, a start absolute address position, and an end absolute address position of each song are recorded.

The signal format used here can be the same as that shown in FIGS. 12 and 13 used in the description of the conventional example.

In the TOC area 1a and the main information area 1b of the magneto-optical disk 1, spiral guide grooves 2 are formed at predetermined intervals in the radial direction of the disk as shown by hatching in FIG. Have been. The guide groove 2 in the radial direction of the magneto-optical disk 1 corresponds to whether the absolute address on the magneto-optical disk 1 is "1" or "0" after the biphase mark modulation. It is biased inward or outward. Note that the above-mentioned absolute address indicates a position on the magneto-optical disk 1 and becomes pre-recorded information as CLV (Constant Linear Velocity) rotation control information. Also, since the absolute address here corresponds to one sector in the CD format, it is also referred to as a sector hereinafter.

The format used for the magneto-optical disk 1 will be described with reference to FIGS. In addition,
This format is based on the format described in the conventional example and shown in FIGS.

The format shown in FIG. 4 shows the format of the main data portion of 2352 bytes in the sector structure shown in FIG. 13, and the main data field 103a is used to identify the head of the sector. Sector synchronization signal 103b, sector address 103c indicating the address of each sector, and user data 103d
It consists of. The sector address has the same value as the absolute address information pre-recorded on the magneto-optical disk 1, for example.

These byte structures are stored in a CD-ROM (C
If the example of ompact disc (read only memory) is applied, the sector synchronization signal 103b can allocate 12 bytes and the sector address 103c can allocate 4 bytes (called a header in a CD-ROM).

Therefore, (2352-12-4) = 2336 bytes can be used as user data per sector.

The format of the block structure used to enable information rewriting in this embodiment is, as shown in FIG. 5, a block 1 which is the minimum unit of the recording / reproducing operation.
04a is from sector 0 (104b) to sector 14 (1
04p). Among them, sector 0 (104b) and sector 1 (104c),
Sector 13 (104o) and sector 14 (104o)
p) is a sector group added for rewriting in block units. In other words, when information is to be rewritten using the above-described CD signal format, the information on the target sector position is transferred to the actual magneto-optical disk 1 by the incomplete interleaving by the CIRC.
In this case, since the data is dispersed in the preceding and following sectors, it becomes difficult to rewrite only the desired sector (in detail, Japanese Patent Publication No. 64-55787).
Please refer to it because it is also described in Japanese Patent Publication No.

According to the CD format, all recording information is continuous, but if rewriting is performed, a large number of data errors will occur at the recording start and end points, realizing the original correction capability of the CIRC. In this case, since the code propagation length by the non-completed interleaving requires 105 frames, it is desirable to provide 1.07 sectors or more, that is, two additional sectors before and after the sector composed of 98 frames. The additional sector at the front is a PLL (Phase L) from the recording start point.
It is also necessary as an area for pulling in the ocked Loop. Accordingly, in the block 104a, two additional sectors are respectively allocated before and after the sector group in which the user data is arranged among the 15 sectors, and the data block 105 is composed of the sectors 2 (104d) to 12 ( 104n), and (2336 × 11 ≒ 25.7 kbytes ≒ 206 kbits) are given.

FIG. 6 shows the arrangement of the blocks used for actual music information. The program 106a corresponding to one piece of music is composed of blocks B0 (106b) to Bn (106n). It indicates that it is composed of a set.

Next, components of the information recording / reproducing apparatus of this embodiment will be described with reference to the block diagram of FIG.

As shown in FIG. 9, the information recording / reproducing apparatus of this embodiment irradiates a laser beam onto the magneto-optical disk 1 during recording and reproduction, and a spindle motor 4 for supporting and rotating the magneto-optical disk 1. And a coil 24 for applying a magnetic field to the magneto-optical disk 1 during recording. The information recording / reproducing apparatus according to the present embodiment is configured to perform recording by a so-called magnetic field modulation method, and can perform overwriting for recording new information on the already recorded information.

First, the components of the recording system will be described along with the basic information recording operation. Analog information input from the input terminal 18 is converted into a digital signal by an A / D (analog / digital) converter 19. After that, it is supplied to the information compression processing circuit 20.

The information compression processing circuit 20 compresses digital audio information continuously input from the A / D converter 19 by using a predetermined algorithm. The information compression processing circuit 20 has a sampling frequency of 44.1 kHz and a quantization frequency of 44.1 kHz. The number of bits = 16 bits of audio information is 128 kbps per channel (here, since two channels are handled,
56 kbps).

That is, (44.1 kHz × 16 × 2 ≒)
Since information of 1.41 Mbps is compressed into information of 256 kbps, (256 k / 1.41 Mbps)
A compression ratio of 5.5) is obtained.

For specific methods, see, for example, Shinji Hayashi, “Sound Coding Algorithms and Standardization Trends” (IEICE Technical Report).
Vol.89, No.434, pp.17-22) and the like can be used, but the description is omitted here because it is not limited to the contents.

In addition, in addition to the above-described compression processing, the information compression processing circuit 20 applies the sector synchronization signal 103b and the controller 10 to the user data 103d as digital music information in accordance with the main data format in the sector shown in FIG. Given sector address 103
After adding c for each sector, an additional sector shown in FIG. 5 is generated, and is temporarily written as a compressed audio block together with the compressed audio information in the first buffer memory 21 as first memory means. This process is the first
This is a function as recording means.

Next, the compressed audio block is read from the first buffer memory 21 at a necessary timing according to an instruction from the controller 10 and sent to the recording data processing circuit 22.

In the recording data processing circuit 22, the compressed audio block from the first buffer
The parity for error detection and correction is generated and added by C, the subcode information from the controller 10 is added, and after EFM modulation, it is supplied to the coil driver 23 with a frame synchronization signal added.

The coil driver 23 drives the coil 24 based on the supplied signal, and at the same time,
A signal is recorded by irradiating the magneto-optical disk 1 with a laser beam from the optical disk. Therefore, the recording data processing circuit 22, the coil driver 23, the coil 24, the optical head 3, and the controller 10
Recording means is configured.

Next, the reproduction system will be described. The signal read by the optical head 3 is amplified by the reproduction amplifier 5 and
The quantified magneto-optical signal Ps is supplied to the reproduction data processing circuit 9. The optical head 3, the reproduction amplifier 5, and the reproduction data processing circuit 9 constitute a first reproduction unit.
The reproduction signal amplified by the reproduction amplifier 5 is sent to the pre-recorded information detection circuit 6. The prerecorded information detection circuit 6
For example, a band-pass filter and a PLL (Phase Locked Loo
p), and for the pre-recorded information in the reproduction signal extracted by the band-pass filter, a clock synchronized with the pre-recorded information is generated by the PLL. Then, a clock synchronized with the above-described prerecorded information, which is formed by biphase mark modulation of the absolute address information, is supplied to the CLV control circuit 7.

The CLV (Constant Linear Velocity) control circuit 7 compares the synchronous clock from the pre-recorded information detecting circuit 6 with a reference frequency stored therein, and controls the spindle motor 4 with the difference signal. , Accurate CLV control is performed. The prerecorded information in the reproduced signal extracted by the prerecorded information detection circuit 6 is supplied to the absolute address detection circuit 8.

The absolute address detection circuit 8 comprises a bi-phase mark demodulation circuit and an address decoder. After the pre-recorded information extracted by the pre-recorded information detection circuit 6 is demodulated, the position on the disk is read by the address decoder. The information is decoded into an absolute address value which is a sector number and supplied to the controller 10.

The reproduction data processing circuit 9 separates the frame synchronization signal from the binarized magneto-optical signal Ps in the reproduction signal supplied from the reproduction amplifier 5 and performs EFM (Eight to Fourteen).
Modulation) The demodulation is performed, the subcode information is separated and sent to the controller 10, and the error correction operation by the CIRC using the parity of the reproduction data is performed.
The reproduced data having the error corrected by the reproduced data processing circuit 9 is converted into a compressed audio block by the controller 1.
0 is temporarily written to the second buffer memory 14 as the second memory means by the instruction of 0, and then the controller 10
And is supplied to the information decompression processing circuit 15 as the second reproducing means. The information decompression processing circuit 15 extracts the sector address information from the compressed audio block read from the second buffer memory 14 and supplies it to the controller 10, and performs a predetermined decompression operation on the compressed audio data (the reverse of the compression processing). (Decompression processing), and sequentially supplies the digital information to a D / A (digital / analog) converter 16, so that the terminal 17 reproduces and outputs the audio information restored to analog.

The controller 10 receives a user's recording and reproduction instructions and the like via an operation unit 13 as a first input unit and a second input unit, and displays a song number and time information related to recording and reproduction on the display unit 12. They are displayed sequentially. Further, receiving the sector value from the absolute address detection circuit 8, that is, the absolute address information, the position of the optical head 3 on the magneto-optical disk 1 is recognized, and the optical head 3 is moved to a desired position using an optical head moving mechanism (not shown). It has an access function to move to a position. Further, the sub-code information provided from the reproduction data processing circuit 9 is recognized, and if the recognized sub-code is the content of the TOC area, it is stored in the TOC memory 11 as management information. From the management information.

Further, at the time of recording, the information compression processing circuit 20
In response to this, the sector address corresponding to the absolute address information is supplied, and the recorded main information, that is, the absolute address information of the music information is stored in the TOC memory 11, and the contents of the TOC memory 11 are stored as necessary. By supplying the subcode information to the recording data processing circuit 22, management information is registered in the TOC area 1a of the magneto-optical disk 1.

Further, the controller 10 instructs and executes, as control means, writing and reading of a compressed audio block to and from the first buffer memory 21 and the second buffer memory 14.

Next, a case where the recording and reproducing operations are performed independently will be described below with reference to the schematic timing charts of FIGS. 7 and 8 and the block diagram of FIG. Here, FIG. 7 illustrates only the time of recording (when only recording is performed and reproduction is not performed). FIG. 7A illustrates input information of the information compression processing circuit 20 (the digital audio information sequence before compression). ), FIG. 7 (b)
7A is a compressed audio block (audio information sequence after compression) output from the information compression processing circuit 20 and written to the first buffer memory 21; FIG. 7C is a recording data processing circuit read from the first buffer memory 21 and 22
4 shows the relationship between each of the compressed audio blocks (compressed audio blocks to be recorded) that are output to. FIG.
The hatched portions shown in (b) and (c) indicate sections where there is no information transfer.

At the time of recording, first, as shown in FIG. 9, the analog audio information inputted from the terminal 18 is inputted as continuous information, and the A / D converter 19
Is converted into 1.41 Mbps digital audio information. That is, as shown in FIG. 7A, blocks A0 (107a), A1 (107b), and A2 (1
07c)... Constitute audio information corresponding to about 0.8 seconds each, and the information amount is (44.1 kHz × 16 bits × 2 channels × 0.8 seconds = 1.12896 Mbits = 141.12 kbytes). Since these pre-compression information sequences are compressed to about 1 / 5.5 by the information compression processing circuit 20, the compressed audio information becomes (141.12 kbytes / 5.5) ｋ25.66 kbytes. Further, the sector synchronization signal and the sector address information shown in FIG. 4 and the additional sector group shown in FIG. 5 are added, and as shown in FIG. 7B, a slight processing time delay from the time tw0 occurs. Accordingly, from time tw1, the compressed audio block B0 (1
08b) .B1 (108c), B2 (108d)... Are sequentially written to the first buffer memory 21.

In the compressed audio block shown in FIG. 7B, the compressed audio information (25.66 Kbytes) per block includes a sector synchronization signal (1).
2 bytes x 15 sectors) and sector address information (4
Since bytes × 15 sectors and additional sectors (2336 bytes × 4 sectors) are added, the total capacity of the block is 25.66 k + (12 × 15) + (4 × 15) + (2336 bytes × 4)） 35 .2 kbytes, and the write transfer speed to the first buffer memory 21 is ((35.2 kbytes × 8 bits) /0.8 seconds) ≒ 352.4 kbps.

On the other hand, the compressed audio block written in the first buffer memory 21 is stored in the first buffer memory 21 of the compressed audio block as shown in FIG.
The compressed audio blocks B0 (109b) and B1 (109) are written at times tw2, tw4,.
.. d) are read out from the first buffer memory 21 and output to the print data processing circuit 22, whereby printing is performed with the above-described series of operations.

Note that the memory read speed (corresponding to the transfer speed of recorded information) in FIG.
D is 1.41 Mbps, which is the same as D, and is (1.41 Mbps / 352.4 kbps) ≒ 4 times as large as the above memory write transfer rate. This relationship is based on the compressed audio blocks B0 (109b) and B1 (109) on the magneto-optical disk 1.
d) are each composed of 15 sectors, and the time per sector is (1/75) seconds as described above. Therefore, (1/75) × 15 = 0.2 seconds. Previous audio block A0 (1
07a) · A1 (107b) · A2 (107c) ··· 0.8 seconds, which is the occupation time of (0.8 / 0.2) = 4 times. Match.

Therefore, the actual recording operation is performed in 1/4 of the compressed audio block time of one block, and the remaining 3/4 of the time is in a standby state. By the repetition, recording of continuous audio information input from the outside is performed.

Next, FIG. 8 shows a state at the time of reproduction (only reproduction is performed.
FIG. 8 (a) shows the operation of FIG.
8 is a compressed audio block reproduced from the magneto-optical disk 1 and written from the reproduced data processing circuit 9 to the second buffer memory 14. FIG. 8B is a diagram showing an information decompression processing circuit 15 read from the second buffer memory 14 and read from the second buffer memory 14. 8 (c) shows the relationship between each of the decompressed audio information strings output from the information decompression processing circuit 15. 8A and 8B.
In (c), a hatched portion indicates a section where there is no information transfer.

At the time of reproduction, first, at times tr0 to tr3, as shown in FIG. 8A, the compressed audio blocks B0 (110a) to B3 (110d) are all
After writing to the buffer memory 14, the writing is interrupted. The interruption is temporarily performed here because the capacity of the second buffer memory 14 is finite. FIG. 8 shows a case where the buffer memory capacity is four blocks for convenience of explanation. FIG.
The buffer memory write transfer rate shown in (a) is 1.41 Mbps corresponding to the above recording time.

At the same time, as shown in FIG. 8B, the compressed audio block B0 (110
The read operation is started when the buffer memory writing of a) is completed. Here, the memory read transfer rate of the compressed audio block B0 (111b) is 352.4 kbps corresponding to the recording time.

As shown in FIG. 8C, audio reproduction after audio information decompression is performed at time tr1.
This is performed when the expanded audio output is started by the information expansion processing circuit 15 from the time tr2 with a slight processing time delay.

On the other hand, when time tr4 is reached, FIG.
Has completed reading of the compressed audio block B0 (111b) in the second buffer memory 14
Therefore, as shown in FIG. 8A, reproduction of the compressed audio block B4 (110f), that is, writing to the second buffer memory 14, is performed, and the standby state is resumed. Note that the ratio of the write transfer rate to the second buffer memory 14 and the read transfer rate is (1.41 Mbps / 352.4 kbps) ≒ 4 times. Accordingly, the actual reproduction operation is performed in a time period of 1/4 of the compressed audio block time of one block, and the remaining 3/4 time is in a standby state. By reading the compressed audio block from the magneto-optical disk 1 intermittently every time a vacancy occurs and writing and supplementing it in the second buffer memory 14, continuous reproduction of audio information is performed without interruption.

Next, the simultaneous recording / reproducing operation based on the above-mentioned basic operations in the information recording / reproducing apparatus of the present embodiment, that is, the recording of information input from the outside and the recorded The operation when information is reproduced in parallel will be described with reference to the flowchart of FIG. 1, the block diagram of FIG. 9, and the operation time chart of FIG.

FIGS. 10 (a), 10 (b) and 10 (c) show signal flows related to the recording operation. FIG. 10 (a) shows audio information input to the information compression processing circuit 20, and FIG.
0 (b) is a compressed audio block written to the first buffer memory 21 after being compressed by the information compression processing circuit 20, and FIG. 10 (c) is read from the first buffer memory 21 and supplied to the recording data processing circuit 22. Indicates a compressed audio block to be recorded, that is, recorded. Also,
10 (d), (e) and (f) show the signal flow relating to the reproducing operation. FIG. 10 (d) shows the signal reproduced from the magneto-optical disk 1 and transmitted from the reproduced data processing circuit 9 to the second buffer memory 14. Compressed audio block to be written, FIG. 1
0 (e) shows a compressed audio block read from the second buffer memory 14 and sent to the information decompression processing circuit 15, and FIG. 10 (f) shows audio information decompressed and output by the information decompression processing circuit 15. Note that FIG. 10 shows a case where a recording start instruction is issued from time t0 and a reproduction start instruction is issued at time t2 for convenience of explanation. As an operation, reproduction from the recording start position is performed about 5 seconds after the recording is started. An example in which the audio information is recorded and input is reproduced with a delay of about 5 seconds will be described.

Here, the description will be made with the processing time delay of the information compression processing circuit 20 and the information decompression processing circuit 15 shown in FIGS. 7 and 8 omitted, and the first buffer memory 21 and the second buffer memory 14 are omitted. Is assumed to have a capacity capable of storing at least five or more compressed audio blocks. Further, it is assumed that a recording operation is started in response to a recording instruction from a user, and desired reproduction is performed in parallel with recording in accordance with a reproduction instruction during the recording operation.

As shown in FIG. 1, when a recording instruction from the user is given from the operation unit 13 and is instructed by the controller 10 (S0), the controller 10 first plays, which is processing identification information indicating a reproduction operation. The flag is set to "0" to stop the reproduction operation (S1), and the recording address Ar corresponding to the recording block is, for example, the innermost corresponding address of the main information area 1b of the magneto-optical disk 1 [00:00]
0 seconds 00 frames] (S2). Note that the recording address Ar and the reproduction address Ap described below indicate the absolute head address of each compressed audio block to be recorded and reproduced.

Next, the start of writing external information to the first buffer memory 21 is instructed (S3), and the recording address Ar position, that is, the disk innermost address [0
[0: 00: 00: 00]] (S4), it is determined whether or not writing of the compressed audio block of four blocks to the first buffer memory 21 has been completed (S5). Are repeated until all the compressed audio data of the first buffer memory 21 are collected. When the termination is determined, the first buffer memory 21
The compressed audio blocks of four blocks are read out and supplied to the recording data processing circuit 22, whereby recording on the magneto-optical disk 1 is performed (S6).

If the above procedure is made to correspond to FIG. 10, after the setting of S0 to S3 from time t0, an access operation to the recording block corresponding recording address Ar in S4 is performed, as shown in FIG. As described above, four blocks RB0 (b0), RB1 (b1), RB2 (b2), and R are used to write the compressed audio block to the first buffer memory 21.
From the time point t1 when B3 (b3) is completed, as shown in FIG. 10C, the compressed audio blocks RB0 (c0), RB1 (c1), RB2 are stored in the first buffer memory 21.
(C2) RB3 (c3) is read out and recorded at the corresponding position on the magneto-optical disk 1, and reaches time t2. Note that 4 is stored in the first buffer memory 21 in S5.
The block write completion determination can be made based on the relationship of the sector address information which the controller 10 sequentially gives to the information compression processing circuit 20 for each sector.

Next, as shown in FIG. 1, the corresponding recording address Ar of the compressed audio block to be recorded next is updated (S7). In this case, since four blocks have been recorded in S6, 4 blocks are added to the current recording address Ar value.
An address value obtained by adding a block amount, that is, (15 × 4) = 60 sectors, is [00:00:00 frames].
Are added to the recording block, and [00:00:60 frame] is the recording address Ar corresponding to the updated recording block.

Next, it is determined whether or not there is a reproduction start instruction from the operation unit 13 (S8).
When the reproduction start instruction is issued while the processing is shifted to 1, the reproduction block corresponding reproduction address Ap is obtained (S9). This reproduction address Ap is set to the address at which recording is started in the case of a normal reproduction instruction, and if the above example is applied, [0
0 minutes 00 seconds 00 frames]. Also,
If the reproduction start instruction is a reproduction instruction for time designation from the operation unit 13 as the reproduction time processing means, the reproduction start instruction is calculated and obtained by the controller 10 as the operation means from the contents of the instruction. For example, if there is a reproduction instruction 15 minutes ahead of the recording start time, since the audio equivalent time of one block is 0.8 seconds in this embodiment, (1
5 × 60) /0.8=1125 blocks, and when converted into the number of sectors, it is 1125 × 15 = 16875 sectors. Therefore, the above-mentioned 16875 is used for the recording start address [00: 00: 00: 00 frame]. [03:45:00 frame] (the frame of the address value is 75 base and the second is 60 base) is obtained as the address including the sector.

Next, after the play flag is set to "1" (S10), it is determined whether or not there is a reproduction interruption instruction from the operation unit 13 (S11).
After the y flag is set to "0" and the reading of the second buffer memory 14 is stopped (S12), the reproduction instruction state based on the play flag is determined (S13). In other words, the play flag is information for determining whether or not to perform playback, and when a playback start instruction is input from the operation unit 13, the play flag is set to S.
When the play flag is set to "1" at 10 and the reproduction interruption instruction is input, the play flag is set to "0" at S12.
As a result, the designated state is determined.

At S13, the play flag is set to "1".
In the case of, the reproduction address corresponding to the reproduction block Ap [0
[00:00:00] frame] (S14), and it is determined whether reading of the compressed audio block from the second buffer memory 14 for four blocks has been completed (S15) or not. Although it is recognized that a free area has occurred in the second buffer memory 14 in the read completion determination, at this time, the second buffer memory 1
4 has not been started yet (the second buffer memory 14 is in an empty state), so that reproduction from the compressed audio block corresponding to the Ap position on the magneto-optical disk 1 is started and the second buffer memory 14 is started. The desired audio information is written into the memory 14 (S16) and the reading of the second buffer memory 14 is started (S17), so that the desired audio information is stored in the optical head 3, the reproduction amplifier 5, the reproduction data processing circuit 9, the second buffer memory, and the like. Reproduction is started via the information expansion processing circuit 15, the D / A converter 16, and the like. Note that the determination of the reading status of the second buffer memory 14 in S15 can be made based on the sector address recognized by the information decompression processing circuit 15.

Next, it is determined that the writing of the compressed audio information to the second buffer memory 14 has been completed for four blocks (S18), and the corresponding reproduction address Ap of the compressed audio block to be reproduced next is updated (S1).
9). In this case, since four blocks have been reproduced, four blocks, that is, 15 ×
4 = the address value obtained by adding 60 sectors, 60 sectors are added to [00:00:00 frame], and [0
0:00:60 frames] is the updated reproduction block corresponding address Ap.

Thereafter, it is determined whether an instruction to terminate recording and reproduction has been input from the operation unit 13 (S20), and if there is no termination instruction, the flow returns to S4 to repeat the above-mentioned operations. Are performed alternately to perform simultaneous and parallel recording and reproduction.

When the above procedure is made to correspond to the time chart of FIG. 10, it shows a case where a reproduction start instruction is input from the operation unit 13 at time t2, and there is no reproduction interruption instruction after S8 to S11. To reach S13 and play
It is determined that the flag is "1", and an access operation to the [00:00:00] frame position corresponding to the reproduction block corresponding address Ap is performed in response to S14, and S16 is performed.
From time t3, as shown in FIG.
Writing of the compressed audio block RB0 (d0) corresponding to the address Ap position from the magneto-optical disk 1 to the second buffer memory 14 is started, and in response to S17,
As shown in FIG. 10E, the second buffer memory 14
Read compressed audio block from block PB
0 (e0), and are sequentially output from the output block PA0 (f0) as decompressed audio information shown in FIG.

Then, at time t4 corresponding to S18, FIG.
Writing of four compressed audio blocks indicated by 0 (d) is completed, that is, blocks PB0 (d0) and PB0
The end of writing of 1 (d1) · PB2 (d2) · PB3 (d3) is recognized, and the next recording operation corresponding to the steps S19, S20 and S4 to S7 is performed as shown in FIG. From t5, the compressed audio block RB4
(C4) RB5 (c5) RB6 (c6) RB7
The reading from the first buffer memory 21 and the recording operation on the magneto-optical disk 1 in (c7) are performed, and thereafter, the intermittent reproducing operation and the recording operation are alternately performed.

On the other hand, if there is a reproduction interruption instruction from the operation unit 13 during the intermittent recording operation and reproduction operation based on the above contents, the judgment is made in S11, and the play flag is set to "0" in S12. And reading of the second buffer memory 14 is stopped, so that the intermittent playback operation is interrupted while the recording operation is being performed, and playback from the interrupted position is performed in the subsequent playback start instruction input stage. It is performed continuously.

The recording address Ar and the reproducing address Ap in S7 and S19 are updated in the main information area 100c on the magneto-optical disk 1 where recording and reproduction are performed, for example, when the area exceeds the outermost peripheral position at the end of the area. By setting the recording operation (and the reproducing operation) at the innermost peripheral position, which is the start end, the controller 1 as a repetitive unit until the recording stop instruction in S20 is determined.
0 is executed endlessly.

In the above operation example, S4 and S1
The access operation in No. 4 is as shown in FIG.
The access performance is assumed to end between times t2 and t3, and between times t4 and t5, that is, at the worst, within 0.8 seconds, which is the required time of one audio block before compression. Can be easily handled by increasing the storage capacity of the first buffer memory 21 and / or the second buffer memory 14.

In the above-described operation example, an example in which a user's recording start instruction is given from the operation unit 13 as the recording start instruction has been described. However, the operation unit 13 includes a timer device as recording time instruction means. The recording start instruction from the timer device corresponding to the preset recording start time increases the convenience. Further, in the case of an information recording / reproducing apparatus having a built-in FM tuner or the like, a start button and a pause button for listening to FM broadcast are provided, and the operation of the FM tuner and the audio amplifier is permitted by inputting the start button, and a recording start instruction is given. By interrupting the operation of the audio amplifier by inputting a suspend button (silencing operation, etc.) and giving a reproduction suspension instruction, the user does not need to be conscious of the operation as the information recording / reproducing apparatus, and the recording medium such as a CD can be used. It becomes possible to listen to FM broadcast at an arbitrary time as if playing.

Further, in the above operation example, for convenience of explanation, the reproduction is performed from the recording start position approximately 5 seconds after the recording is started, that is, the audio information to be recorded is reproduced with a delay of approximately 5 seconds. As described above, as a practical use example, a playback start instruction and a playback interruption instruction are given from the operation unit 13 at any time after the start of recording, so that the time within a range not exceeding the maximum recording time of the recording medium is obtained. A reproducing operation with a shift can be performed.

As described above, in the information recording / reproducing apparatus of the present embodiment, the controller 10 allows the information compression processing circuit 20 to output the main information input from the outside based on the main information recording instruction input from the operation unit 13. Are sequentially stored in the first buffer memory 21 at the first transfer speed, and the main information stored in the first buffer memory 21 is read out by the recording data processing circuit 22 at the second transfer speed higher than the first transfer speed. The data is intermittently recorded on the magneto-optical disk 1 in block units. In parallel with the intermittent recording on the magneto-optical disk 1 by the recording data processing circuit 22, the controller 10 transmits the content already recorded on the magneto-optical disk 1 to the main information reproduction instruction input from the operation unit 13. In the reproduction data processing circuit 9, the main information on the magneto-optical disk 1 is read out intermittently in units of blocks and recorded in the second buffer memory 14 at the second transfer speed, and the information decompression processing circuit 15 The main information stored in the second buffer memory 14 is sequentially read out at the first transfer rate and output to the outside.

As a result, even during the recording operation, the reproduction operation at an arbitrary position can be performed at the same time, and the user can listen to the past broadcast content that goes back to the maximum recording time of the magneto-optical disk 1, that is, FM broadcast or the like. A new information recording / reproducing apparatus capable of performing a time-shift listening at a time can be realized. Therefore, the user only needs to give a direct recording instruction, and thereafter, can play back as if he were handling a recording medium such as a CD or tape. For example, even when a two-hour program is recorded, the recording ends. This makes it possible to play back to an arbitrary time at which recording is completed without waiting for playback.

Further, since it is easy to interrupt and continue only the playback operation during simultaneous recording and playback, even if the listening of broadcast contents is interrupted, continuous playback without interruption of information is troublesome operation. It can be performed without performing.

Further, since the operation unit 13 is provided with a timer device for instructing the start of recording in accordance with the preset recording start time, the operation unit 1 operates at the predetermined recording start time.
Even if no input is made by the user, the timer device automatically issues a recording start instruction according to the recording start time. Therefore,
The user only needs to set the timer for scheduled recording. After that, the recording can be played back at the same interval as when handling recording media such as CDs and tapes. For example, even if a two-hour program is recorded, the recording ends. The reproduction can be performed at an arbitrary time when the recording is completed without waiting for the reproduction. As a result, operability can be improved.

Further, by providing the operation section 13 with a function as a reproduction time instructing means for instructing a reproduction start time, it is possible to automatically reproduce at a predetermined time.

At the time of reproduction, the controller 10 as an arithmetic means determines the reproduction start absolute address value of the magneto-optical disk 1 corresponding to the instructed time, so that the information corresponding to the desired time is reproduced. It becomes possible. Thereby, the operability can be improved.

Further, the operation unit 13 is provided with a controller 10 as external information input means for issuing a main information recording instruction to a recording medium based on recording instruction information input together with the main information from the outside. By, without direct manual input, together with the main information input from the outside, by including the main information recording instruction on the recording medium, automatically instruct the main information recording on the recording medium, Thereby, it is possible to record on the recording medium. Thereby, the operability can be improved.

The controller 10 is provided with a function as a repetition means for sequentially repeating recording by the recording data processing circuit 22 and reproduction by the reproduction data processing circuit 9 within a predetermined area on the magneto-optical disk 1. As a result, desired information can be recorded and reproduced sequentially and repeatedly. Thereby, the operability can be improved.

Although the above embodiment has been described using an example of applying the CD format as a base, the present invention is not limited to this. Of course, there are various forms of block configuration and sector configuration. Various forms can be applied to the address information.

Further, in this embodiment, an example in which audio information is handled has been described. However, it is apparent that the present invention can be applied to a case in which image information and other visual or auditory continuous information are handled. Furthermore, in the present embodiment, an example using compressed audio information has been described, but the present invention is not limited to this. Basically, if there is a difference in information transfer speed between the writing side and the reading side of the buffer memory,
It can be applied in various forms. For example, in the case of the above-mentioned CD format, by increasing the linear velocity of the disc, the conventional CD audio information that is not compressed (sampling frequency = 44.1 kHz, quantization bit number = 16 bits, channel number = It becomes applicable as it is in 2).

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, or the like without departing from the spirit of the present invention.

[0093]

According to the first aspect of the present invention, there is provided an information recording / reproducing apparatus.
As described above, recording means for performing compression processing on main information input from the outside and performing intermittent recording on the recording medium, and intermittently reading main information on the recording medium and performing expansion processing for reproduction A first input unit for inputting a main information recording instruction to the recording medium; a second input unit for inputting a main information reproduction instruction or a main information reproduction interruption instruction to the recording medium; after the main information recording instruction from said first input means is made, when the main information reproduction instruction from the second input means is input, during intermittent recording execution of the recording medium of the main information, the recording has been the main information in parallel with the recording was intermittently read out the reproduction means further recording running
During the reproduction of the main information, the reproduction of the main information is interrupted from the second input means.
When the instruction is input, the main information is intermittently recorded on the recording medium.
Reading of the above main information by the playback means while performing
Is interrupted, and a subsequent main information playback instruction is input.
Ri is a configuration in which a control means Ru allowed to continue reproduction of the main information is provided from an arbitrary position.

Thus, based on the main information recording instruction input from the first input means, the control means causes the recording means to:
The main information input from the outside is subjected to a compression process to intermittently record on a recording medium. The control means reproduces the contents already recorded on the recording medium based on the main information reproduction instruction input from the second input means in parallel with the intermittent recording on the recording medium by the recording means. Means for intermittently reading the main information on the recording medium, subjecting the main information to a decompression process, and outputting the same externally. Further, the control means may include
During the reproduction of the main information being executed, the main information is input from the second input means.
When the playback interruption instruction is input, the main information is written to the recording medium.
The main information is read by the playback means while the recording is being executed.
Only the main information is reproduced from the second input means.
When an instruction is input, the main unit
Continue reading information.

As a result, even during recording, it is possible to immediately reproduce the already recorded contents,
As a result, the operability can be improved. Furthermore, recording and playback of main information are performed simultaneously.
Interrupting or continuing only the playback operation while
It is easy to stop the playback of the main information
No need to perform troublesome operations for continuous playback without interruption.
It also has the effect of being able to perform well.

In the information recording / reproducing apparatus according to the second aspect of the present invention, as described above, in the information recording / reproducing apparatus according to the first aspect, the first input means starts recording according to a recording start time set in advance. This is a configuration in which recording time indicating means for giving an instruction is provided.

As a result, the first recording is started at the predetermined recording start time.
Even if no input is made by the input means, the recording time instructing means automatically issues a recording start instruction in accordance with the recording start time. As a result, there is an effect that the operability can be improved.

According to the third aspect of the present invention, as described above, in the information recording / reproducing apparatus according to the first aspect, the second input means includes a reproduction time for designating a reproduction start time. Instruction means is provided, and the control means
The stage corresponds to a time indicated by said reproduction time instructing means is configured such that calculation means for determining a reproduction start absolute address value of the corresponding recording medium is provided.

Thus, it is possible to automatically play back at a predetermined time. Further, at the time of reproduction, the arithmetic means finds the reproduction start absolute address value of the recording medium corresponding to the instructed time, so that the information corresponding to the desired time can be reproduced. As a result, there is an effect that the operability can be improved.

According to a fourth aspect of the present invention, as described above, in the information recording / reproducing apparatus according to the first aspect, the first input means includes recording instruction information externally input together with main information. External information input means for instructing the recording of the main information from the outside to the recording medium based on the information is provided.

Thus, even if the user does not manually input the information, the main information input from the outside and the external
By made to contain a recording instruction of the main information et instructs the main information recording to automatically recording medium can be recorded on a recording medium. As a result, there is an effect that the operability can be improved.

[0102] Information recording and reproducing apparatus of the invention of claim 5 is, as described above, in the information recording reproducing apparatus according to claim 1, wherein, in the above-mentioned control means, recorded in a predetermined area on the recording medium
In this configuration, a repetition means for sequentially repeating recording by means and reproduction by reproduction means is provided.

As a result, desired information can be recorded and reproduced sequentially and repeatedly. As a result, there is an effect that the operability can be improved.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a control operation of a controller of an information recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic plan view showing an area arrangement of a magneto-optical disk used in the information recording / reproducing apparatus.

FIG. 3 is an enlarged plan view of the magneto-optical disk.

FIG. 4 is a schematic diagram showing a main data format in a sector of the magneto-optical disk.

FIG. 5 is a schematic diagram showing a sector configuration of the magneto-optical disk.

FIG. 6 is a schematic diagram showing a block configuration in a program.

FIG. 7 is a timing chart showing a flow of information related to a recording operation.

FIG. 8 is a timing chart showing a flow of information related to a reproducing operation.

FIG. 9 is a block diagram illustrating a configuration of an information recording / reproducing apparatus.

FIG. 10 is a timing chart showing a flow of information when a recording operation and a reproducing operation are performed in parallel.

FIG. 11 is a CD used in a conventional information recording / reproducing apparatus.
It is a schematic plan view which shows the area | region arrangement | positioning of.

FIG. 12 is a schematic diagram showing a frame signal format of a CD.

FIG. 13 is a schematic diagram showing a sector format of a CD.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Magneto-optical disk (recording medium) 3 Optical head ( reproduction means / recording means ) 5 Reproduction amplifier ( reproduction means ) 9 Reproduction data processing circuit ( reproduction means ) 10 Controller (control means) 13 Operation part (first input means, 2 input means) 14 second buffer memory 21 first buffer memory 22 recording data processing circuit ( recording means ) 23 coil driver ( recording means ) 24 coil ( recording means )

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 20/10

Claims (5)

(57) [Claims] A recording means for intermittently recording on a recording medium by performing compression processing on main information input from the outside; intermittently reading out main information on the recording medium; And a first means for inputting a main information recording instruction to the recording medium.
An input means, second input means for inputting the main information reproduction instruction or main information playback interrupt instruction <br/> to the recording medium, after the said main information recording instruction from the first input means is made, the When the main information reproducing instruction is input from the second input means, during the intermittent recording of the main information on the recording medium, the recorded main information is intermittently read by the reproducing means in parallel with the recording. And play back the main information during recording
During the operation, the main information reproduction stop instruction is input from the second input means.
Intermittent recording of the above main information on the recording medium
Reading of the main information by the playback means is interrupted
The main information playback instruction,
Information recording and reproducing apparatus characterized by control means for Ru to continue the playback of al of the main information is provided. 2. The information recording / reproducing apparatus according to claim 1, wherein said first input means is provided with a recording time instructing means for instructing a recording start according to a preset recording start time. apparatus. 3. The reproduction apparatus according to claim 2, wherein the second input means includes a reproduction time instructing means for instructing a reproduction start time, and the control means has a function corresponding to the time instructed by the reproduction time instructing means. 2. The information recording / reproducing apparatus according to claim 1, further comprising a calculating means for obtaining a reproduction start absolute address value of the corresponding recording medium. 4. The apparatus according to claim 1, wherein said first input means is provided with external information input means for instructing external recording of main information on a recording medium based on recording instruction information input together with main information from outside. The information recording / reproducing apparatus according to claim 1, wherein 5. The information according to claim 1, wherein said control means is provided with a repetition means for sequentially repeating recording by said recording means and reproduction by said reproducing means within a predetermined area on the recording medium. Recording and playback device.