JP2887189B2 - 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 for recording and reproducing digitized audio signals and the like on a recording medium such as a disk.

[0002]

2. Description of the Related Art Conventionally, various devices have been used for recording / reproducing continuous information such as music information. Due to recent advances in digital technology, digital recording / reproducing devices such as optical disk devices have become practical. Has been For example, a compact disk player is a read-only optical disk device using a compact disk (hereinafter, referred to as a CD) as a medium, and is widely and widely used because of its advantages such as high sound quality.

As shown in FIG. 12, a disk 101 as a CD is a disk 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) 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 based on a subcode 102b (see FIG. 13) described later are recorded. In the TOC area 101a, additional information relating to 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 data for a computer.

Each signal is recorded on the disk 101 in the format shown in FIG. The frame 102 of the recording signal includes a frame synchronization signal 102a indicating the beginning of the frame 102, a subcode 102b indicating additional information of data, and a data field 102c. The data field 102c is obtained by adding parity for error detection and correction to 24-byte data, which is main information, and includes a CIRC (Cross Interleave Reed Sol.
Omon Code), which is an error detection and correction method that combines incomplete interleaving.

[0005] As shown in FIG.
The frame synchronization signal 1 is formed by eight frames.
03a, a subcoding frame 103b consisting of 98 subcodes 102b, and a data field 1
03c. The sub-coding frame 103b indicates a track number (called a song number when the main information is music information), absolute address information on a disc, and the like. Since the sector 103 has a sector length of 1/75 second, 75 sectors are 1 second. The sector number is
Minutes: Seconds: Continuous time information and position information sequentially increasing from the innermost circumference of the main information area 101b are shown as frame information (the frame is 75 base).

The data field 103c has 2352 bytes of main data and 784 bytes of parity in a 98-frame configuration. The number of data per second and the number of data per sector are set as follows. Assigned as main data. When audio information is arranged in main data, according to the CD format, the sampling frequency is 44.1 kHz, 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
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 music pieces 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, in response to the subsequent reproduction instruction, the sector number is collated with the information of the TOC area 101a and the subcode 102b of the main information area 101b, so that the reproduction of a desired track is promptly performed with an access operation. Is done.

A CD has a constant linear velocity, so-called CLV (Con
Since the recording is performed by the stant linear velocity (VST) method, the recording density is constant at any position on the CD, and the recording capacity is improved. In an actual CD player, the CLV control is executed 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. Is done.

On the other hand, in recent years, a disk recording / reproducing apparatus capable of recording various kinds of information such as music information and computer information on a rewritable disk such as a magneto-optical disk has been developed further from a CD. When such a disk recording / reproducing apparatus is put into practical use, it is desirable that the reproducing method be shared between the conventional CD and the conventional CD to provide compatibility.

However, when recording is performed on an unrecorded initial disk by the above disk recording / reproducing apparatus, there arises a disadvantage that an access operation to an arbitrary sector prior to recording and a CLV control required during recording cannot be performed. This is because the initial disk has no absolute address information using a subcode according to the CD signal format, no frame synchronization signal used for CLV control, and the like.

Therefore, in order to solve the above inconvenience,
JP-A-64-39632 proposes a recording method of an absolute address equivalent to absolute address information by a subcode. In this method, after the absolute address is bi-phase mark modulated, the guide groove of the initial disk is biased inward or outward in the disk radial direction 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 recording information different from that of the Fourteen Modulation (modulation), it is possible to reproduce the two separately. Therefore, by using the above-mentioned absolute address by the guide groove, an access operation can be performed even in an area where there is no recorded information. Also, by using the reproduction carrier component of the above-mentioned absolute address, it is possible to obtain an accurate CL not only during reproduction but also during recording.
V control becomes possible.

[0013]

In a disk recording / reproducing apparatus using the above-mentioned rewritable disk as a recording medium, a program number (track number) is assigned to each tune recorded in the same manner as a conventional CD. As a result, high-speed music selection using quick random access, which is a feature of the disk-shaped recording medium, becomes possible. In such a high-speed song selection, in order to start a performance immediately after the end of access as seen on a CD, it is necessary to match the timing of starting recording at the time of recording with the timing of starting performance of the song to be recorded.

However, in a disk recording / reproducing apparatus, like a conventional tape recorder using a compact cassette or the like as a recording medium, the actual time required for a mechanism for recording to operate stably is required. Is usually slightly delayed from the point when the user presses the record button. For this reason, it is difficult for a general user to perform an accurate recording operation as described above, unlike a CD edited and created by an expert.

For example, if the recording start timing is too fast, an unnecessary silent portion or the like is recorded at the beginning of the music. Then, even if music is selected by high-speed access at the time of reproduction, unnecessary reproduction of a silent part or the like is reproduced, so that reproduction of the actual music part is delayed. If the start of recording is delayed, the beginning of the tune will be missing and the recording will be even more undesirable.

In recording from a package medium such as a CD or a tape (usually called dubbing), a sound source exists at hand, so that re-recording is possible, but recording from a sound source not at hand is not allowed to fail. In particular, in FM broadcasting, etc., if the announcer's narration is entered before the performance of the tune to be recorded starts, and if the narration is cut and recording is to be performed, it is more difficult to match the tune performance start timing with the recording start timing. Becomes For this reason, in recording from an FM broadcast or the like, the user is forced to have difficulty in operation and a sense of tension when recording.

The present invention has been made in view of the above circumstances, and has as its object to prevent head loss of a tune to be recorded due to operation delay of a mechanical part.

[0018]

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

That is, the first information recording / reproducing apparatus has a storage means for storing continuous information and a recording means for instructing preparation for recording.
Recording preparation instructing means, and a preparation finger
A write control means for writing the continuous information from the time of shows there is for each block divided into a predetermined size by the write transfer rate in the storage means, preparing a finger by the recording preparation instruction means
On a recording medium on which continuous information should be recorded at the time indicated
Move the recording means to the absolute address information position of
Access control means, recording start instructing means for instructing start of recording, and writing the continuous information stored in the storage means from a predetermined time or earlier at the time of the instruction by the recording start instructing means from the storage means. A first readout control unit for intermittently reading out each block at a readout transfer speed higher than the transfer speed, and a first readout control unit for recording information read out under the control of the first readout control unit on the recording medium every readout. Recording control means.

Further, the second information recording / reproducing apparatus has a storage means for storing continuous information, and a recording standard for instructing preparation for recording.
And the preparation instruction by the recording preparation instruction means.
From the point in time at which writing is performed, continuous information is written into the storage means at a write transfer speed for each block divided into predetermined sizes .
And write control means, the preparation instruction by the recording preparation instruction means
At a certain point on the recording medium where continuous information should be recorded.
Access to move the recording means to the address information location
Control means, detecting means for detecting a portion corresponding to the start of recording in the continuous information, and storing the continuous information stored in the storage means from a time before a predetermined time when the corresponding portion to start recording is detected by the detecting means. A second read control means for intermittently reading each block from the means at a read transfer rate higher than a write transfer rate; and information read under the control of the second read control means being written to the recording medium each time the read is performed. Second recording control means for recording.

[0021]

In the first information recording / reproducing apparatus, whether continuous information such as music is prepared by a recording preparation instructing means is provided.
Then , the data is written into the storage means for each block at the write transfer speed by the write control means. Then, when there is a recording start instruction based on, for example, a user input operation by the recording start instruction means, the continuous information is read from the storage means.

At this time, the record information is read out intermittently by the first readout control means for each block at a readout transfer speed before a predetermined time from the point when the recording start is instructed. Also, 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 compared to the original state.

As described above, according to the above configuration, the continuous information is compressed and read out from the storage means on the time axis, so that the continuous information stored in the stored information before the recording instruction is issued after the recording instruction is issued by the user. It records information. Therefore, continuous information can be recorded without being affected by the operation delay of the mechanism related to recording.

On the other hand, in the second information recording / reproducing apparatus,
The continuous information such as music is instructed by the recording preparation instructing means.
After that , the data is written into the storage means for each block at the write transfer speed by the write control means. When the continuous information is music information, for example, if a point at which a change from a silent portion to a music portion is set as a recording start corresponding portion, when the above change point is detected by the detecting means, the continuous information is stored from the storage means. Is read.

At this time, the record information is read out intermittently by the second read control means for each block at a read transfer speed before a predetermined time at the change point. Also, since the read transfer rate is faster than the write transfer rate, the continuous information is
The read state is compressed on the time axis as compared with the original state.

As described above, according to the above configuration, similar to the first information recording / reproducing apparatus, continuous information can be recorded without being affected by the operation delay of the mechanism related to recording.

[0027]

【Example】

Embodiment 1 A first embodiment in which the present invention is applied to a disk recording / reproducing apparatus will be described below with reference to FIGS.

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

In the main information area 1b, music information which is continuous information is recorded as main information.
Further, in the TOC area 1a, additional information on 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 for each information is recorded. . Note that the signal format for recording on the magneto-optical disk 1 is the same as the signal format of the conventional CD described above, and a description thereof will be omitted.

As shown in FIG. 3, spiral guide grooves 2 (shown by hatching for convenience) are formed on the recording surface of the magneto-optical disk 1 at predetermined intervals in the radial direction of the disk. Have been. The absolute addresses on the magneto-optical disk 1 are set using the guide grooves 2.

After the bi-phase modulation, the absolute address is
According to whether it is "1" or "0", the guide grooves 2 ...
Is biased inward or outward in the radial direction of the magneto-optical disk 1. The absolute address indicates a position on the magneto-optical disk 1 and serves as pre-recorded information as CLV rotation control information. Further, since the absolute address here corresponds to one sector in the above-mentioned CD format, it is also referred to as a sector hereinafter as appropriate.

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

FIG. 4 shows a format of a main data field of 3352 bytes, that is, a main data field 3 in the sector structure (see FIG. 14).
The main data field 3 includes a sector synchronization signal 3a for identifying the head of a sector, a sector address 3b indicating the address of each sector, and user data 3c.

The sector address 3b has, for example, the same value as the absolute address information recorded on the magneto-optical disk 1 in advance. In such a format, if the 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) are allocated to the sector address 3b.
M is called a header).
Therefore, 2352-12-4 = 2336 bytes can be used as the user data 3c per sector.

FIG. 5 shows the format of a block _Bk used to enable information rewriting in this embodiment. A block B _k (k is 0 and a positive integer) is a minimum unit of information handled in a recording and 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 to be added in order to perform the rewriting of information in blocks. This sector group is provided for the following reason.

When information is to be rewritten using the CD format, the information on the target sector position is dispersed in the previous and next sectors on the actual disk due to the incomplete interleaving by the CIRC. Is difficult to rewrite. For this,
This is described in detail in Japanese Patent Publication No. 1-55787.

Further, according to the CD format, all recording information is continuous, but when rewriting is performed, a large number of data errors occur at the recording start and end points. Therefore, in order to realize the original correction capability of the CIRC, 105 frames are required as a code propagation length by non-complete interleaving. Therefore, at least 105/98 ≒ 1.07 sectors are required before and after a 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 at the front is a PLL from the recording start point.
(Phase Locked Loop) is also required as a pull-in area.

[0038] Thus, in the block B _k, of the 15 sectors S ₀ to S _14, the data block 4 are arranged in a sector S ₂ to S ₁₂ as the user data 3c. As the data block 4, 2336 × 11 ≒ 25.7 bytes ≒ 206 k bits are given. Further, before and after the sector S ₂ to S ₁₂ are the sector S ₀ · S ₁ and the sector S ₁₃ · as additional sector
And S ₁₄ are respectively arranged.

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 configuration of the present disk 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 to rotate at a constant linear velocity.

The present disk recording / reproducing apparatus includes an optical head 13 and a coil 14, and a so-called overwriteable magnetic field modulation system for recording new information on top of recorded information. Is adopted. In this disk recording / reproducing apparatus, recording or reproduction is performed by irradiating the magneto-optical disk 1 with a laser beam by an optical head 13, and a magnetic field modulated by information to be recorded by a coil driver 15 during recording is applied by a coil 14. The voltage is applied to the magneto-optical disk 1.

Further, the present disk recording / reproducing apparatus comprises a recording system processing unit 16, a reproduction system processing unit 17, a pre-recorded information detection circuit 18, an absolute address detection circuit 19, a controller 20, a TOC memory 21, An operation unit 22, a display unit 23, an input terminal 24, and an output terminal 25 are provided.

An A / D converter 26, an information compression processing circuit 27, a recording buffer memory 2
8 and a recording data processing circuit 29.

The A / D converter 26 is 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
Is a circuit for converting 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 converts the digital signal into 128 signals per channel.
Compress to kbps.

In the present disk recording / reproducing apparatus, since two-channel audio signals are handled, digital signals for two 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 in the information compression processing circuit 27 is 256 k / 1.41 M ≒ 1 / 5.5. Becomes

For a specific compression technique, see, for example, Shinji Hayashi, “Sound Coding Algorithms and Standardization Trends” (IEICE Technical Report Vol. 89).
No. 434 pp. 17-22) can be used, and a detailed description thereof will be omitted here.

Further, in addition to the above-described compression processing, the information compression processing circuit 27 also stores a sector synchronization signal 3a and a 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 transmitted as a compressed audio block together with the compressed audio information.

Recording buffer memory 28 as storage means
Is a semiconductor memory for temporarily storing the compressed audio block. Under the control of the controller 20, the recording buffer memory 28 sequentially writes the compressed audio blocks into blocks each having a predetermined size at the write transfer speed transferred from the information compression processing circuit 27, Reading is performed at a higher reading transfer speed for each of a plurality of blocks.

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

The reproduction system processing unit 17 includes a reproduction amplifier 30,
A reproduction data processing circuit 31, a reproduction buffer memory 32, an information decompression 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. It is supposed to do.

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

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

The information decompression processing circuit 33 is a circuit that performs decompression processing corresponding to the compression processing by 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 compressed audio block and
0 is sent.

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

Next, other components of the disk recording / reproducing apparatus will be described.

The prerecorded information detecting circuit 18 is a circuit which takes in the absolute address information subjected to the biphase mark modulation from the reproduced signal from the reproducing amplifier 30 as prerecorded information, and generates a clock synchronized with the prerecorded information. . The prerecorded information detection circuit 18 is constituted by, for example, a bandpass filter and a PLL, and obtains a clock synchronized with the prerecorded information extracted from the reproduced signal by the bandpass filter by the PLL.

The CLV control circuit 12 has a local oscillator. The CLV control circuit 12 compares a reference signal of a constant frequency generated by the local oscillator with a clock output from the prerecorded information detecting 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 bi-phase 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 address decoder to decode the demodulated pre-recorded information by the address decoder.
The position information is decoded into an absolute address value which is a sector number and transmitted to the controller 20.

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

(1) Control of Operation and Display While receiving a user's recording / reproduction instruction or the like via the operation unit 22, the display unit 23 displays a music signal, time information, etc. related to recording / reproduction as needed.

[0064] (2) access control of the optical head 13 (Accession
Access control means) receiving the absolute address information (sector value) from the absolute address detection circuit 19, and
Is recognized, and an optical head moving mechanism (not shown) is controlled to move (access) the optical head 13 to a predetermined position.

(3) Management of Subcode Information The subcode information provided from the reproduction data processing circuit 31 is recognized. The recognized subcode information is the TOC.
In the case of the contents of the area 1a, the subcode information is
The management information is stored in the OC memory 21 and the management information is read from the TOC memory 21 as needed.

(4) Registration of Management Information At recording, a 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
The data is stored in the OC memory 21 and T
The data is read from the OC memory 21 and supplied to the recording data processing circuit 29 as subcode information. By these,
Registration of management information in the TOC area 1a of the magneto-optical disk 1 is performed.

(5) Recording Start Control In response to a recording start instruction input by the user via the operation unit 22 (recording start instruction means) , the operation of each unit related to recording is started.

(6) Memory write / read control (write control means / first read control means) The recording buffer memory 28 is made to read data at a speed faster than data writing. This read is
At the time when the above-mentioned recording start instruction is issued, the information is performed for information from before a predetermined time (read preceding time). In addition, data writing in blocks and intermittent data reading in blocks are performed. On the other hand, the read buffer memory 32 is made to read data at a lower speed than the data write. The above speed ratio will be described later in detail.

(7) Recording Control (First Recording Control Means) Each part is controlled so that data of a plurality of blocks read from the recording buffer memory 28 is recorded in the main information area 1b of the magneto-optical disk 1.

Here, the basic operation of recording and reproduction in the disk recording / reproducing apparatus configured as described above will be described with reference to the sequence diagrams of FIG. 8 and FIG.

First, the recording operation will be described. FIG. 8A shows an audio information sequence input to the information compression processing circuit 27. FIG. 4B shows a compressed audio block (compressed audio information sequence) written in the recording buffer memory 28. (C) of FIG.
Indicates a compressed audio block (compressed audio block to be recorded) input to the recording data processing circuit 29. Note that the hatched portions in (b) and (c) of FIG. 6 indicate sections where there is no information transfer.

[0072] analog audio signal inputted from the input terminal 24 is a continuous information, it is converted by the A / D converter 26 into a digital audio signal of 1.41Mbps, audio information sequence A ₀ · A ₁ · A _Two
... As shown in FIG. 2A, the audio information strings A ₀ , A ₁ , A _2, ... Form audio information corresponding to about 0.8 seconds when corresponding to blocks described later. Then, the information amount is 44.1 kHz × 16 bits × 2 channels × 0.8 seconds = 11.2896 Mbits = 141.12 kbytes.

These information strings are sent to the information compression processing circuit 27.
Thus, the compression information is reduced to about (1 / 5.5), so that the compression information becomes 141.12 kbytes / 5.5 ≒ 25.66 kbytes. The above information sequence is processed by the information compression processing circuit 27 by the sector synchronization signal, the sector address information, and the additional sector group (sectors S ₀ , S ₁ , S
₁₃ · S ₁₄ ) is added. Then, the sequence of information, the compressed slight delay recording from the point of time tw ₁ with the buffer memory 28 from time tw ₀ as shown in (b) of FIG audio blocks _{B 0 · B 1 · B 2} ... Are sequentially written.

The compressed audio block B _0.
B ₁ · B ₂ ... Correspond to the compressed audio information (25.6
6k bytes), a sector synchronization signal (12 bytes x 15 sectors), sector address information (4 bytes x 15 sectors), and an 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.
4 kbps.

On the other hand, the compressed audio block written in the recording buffer memory 28 is compressed audio block B ₀ ′ · B at every time tw ₂ · tw ₄ ... At which the writing is completed, as shown in FIG. Are read out as ₁ 'and input to the recording data processing circuit 29. At this time, the reading speed (corresponding to the transfer speed of the recording information) of the recording buffer memory 28 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 as compared with the above write transfer speed.

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 between the compressed audio blocks B ₀ ′ and B ₁ ′ is (1/75) ×
15 = 0.2 seconds, the audio block A ₀
· (0.8 / 0.2) = 4 times compared to 0.8 seconds which is the occupation time of A ₁ · A ₂ ···, which coincides with the above transfer rate ratio.

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

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

Next, the reproducing operation will be described. FIG. 9A shows a compressed audio block written in the reproduction buffer memory 32. FIG. 3B shows a compressed audio block (audio information sequence before decompression) input to the information decompression processing circuit 33. FIG. 3C shows an audio information sequence input to the D / A converter 34. Note that the hatched portions in (a) to (c) of FIG. 6 indicate sections where no information is transferred.

A 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 supplied to the reproduced data processing circuit 3
After being subjected to processing such as demodulation in step 1, it is transferred to the reproduction buffer memory 32 as a compressed audio block.

As shown in FIG. 13A, the compressed audio block B ₀ ′ is provided between time tr ₀ and time tr _3.
... B ₃ ′ are written into the reproduction buffer memory 32 at once, and the writing is temporarily interrupted from the time tr ₃ to the time tr ₄ . Here, the writing is interrupted because the capacity of the reproduction buffer memory 32 is almost full, and FIG. 9 shows a case where the capacity is equivalent to four blocks for convenience of explanation. The writing transfer speed at the time of writing is determined by the recording buffer memory 28 at the time of recording.
Is 1.41 Mbps.

In parallel with the above writing, FIG.
As shown in the figure, 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. At this time, the read transfer speed is determined by the recording buffer memory 2 at the time of recording.
8, which is 352.4 kbps.
Therefore, the compressed audio block B ₀ ′ is read as a compressed audio block B ₀ expanded on the time axis.

At time tr ₄ , the compressed audio block B ₀
Is completed, a space is created in the reproduction buffer memory 32. Then, as shown in (a) of the figure, the writing of the compressed audio block B ₄ ′ is continued until the time tr ₆ , and the reproduction buffer memory 32 enters the standby state again.

At time tr ₄ , reading of the compressed audio block B ₁ is started. Further, the compressed audio block B ₅ ′ is written from the time tr ₇ at which the reading of the compressed audio block B ₁ is completed to the time tr ₉ . On the other hand, the read compressed audio block B ₂ is started at time tr _7. Thereafter, such writing and reading are performed in parallel.

The ratio of the write transfer rate to the read buffer memory 32 and the read transfer rate is 1.41 Mbps / 352.4 kbps２4 times. Therefore, the reproducing operation from the magneto-optical disk 1 is performed at a time (（) with respect to the time interval of one compressed audio block, and
The remaining (3/4) time is waiting. After that, similarly, every time the reproduction buffer memory 32 becomes empty, intermittently,
By sequentially writing and supplying the compressed audio blocks from the magneto-optical disk 1 to the reproduction buffer memory 32, continuous transfer of audio information is performed.

The compressed audio blocks B ₀ , B ₁ , B _2, ... Read from the reproduction buffer memory 32 are read by the information decompression processing circuit 33 into the information compression processing circuit 27 during recording.
Are subjected to decompression processing corresponding to the compression processing in step (a), and are returned to the audio information sequence A ₀ · A ₁ · A ₂ ··· before compression. At this time, the information compression processing circuit 27, the audio information sequence _{A 0 · A 1 · A 2} ... is compressed audio block B ₀ ·
Are output at times tr ₂ , tr ₅ , tr ₈ , respectively, with a slight processing time delay from the start of reading B ₁ , B ₂ ,.

Then, the audio information sequence 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 a recording operation for preventing head missing based on the above-described basic operations in the present disk recording / reproducing apparatus will be described with reference to the flowchart of FIG. 10 and the sequence diagram of FIG. I will do it.

In FIG. 1, (a) to (c) show the flow of signals related to the recording operation. (A) of FIG.
Is the audio information (A _0.
A ₁ ... A _{n + 2} ). (B) of FIG.
The compressed audio blocks (B ₀ · B ₁ ... B _{n + 2} ) input to the recording buffer memory 28 are shown. FIG. 3C shows a compressed audio block (B ₀ ′) input from the recording buffer memory 28 to the recording data processing circuit 29.
B ₁ ′ ... B _n ′).

In the following operation example, the processing time delay in the information compression processing circuit 27 is omitted for convenience. It is assumed that the recording buffer memory 28 has a capacity capable of storing at least five compressed audio blocks.

[1] Recording of Head of Audio Information The recording preparation instruction from the user is transmitted to the operation unit 22 (recording preparation finger).
When the signal is given to the controller 20 by the controller 20, the data writing to the recording buffer memory 28 is first started in accordance with an instruction from the controller 20 (S1). Then
The address corresponding to the recording block (hereinafter, simply referred to as a recording address) Ar is set by the controller 20 (S2). The recording address Ar is set at the head of the empty area of the recordable main information area 1b, and is set in the TOC memory 21.
It is determined based on the management information in. Note that the recording address Ar here indicates the head absolute address of each compressed audio block to be recorded.

After setting the recording address Ar, an access operation of the optical head 13 is performed to the position (S3), and a recording start instruction from the user is sent from the operation unit 22 to the controller 2.
It is in a standby state until it is given to 0 (S4). When the recording start instruction is input, the system further waits until the writing of the compressed audio block into the recording buffer memory 28 in units of one block is completed (S5).

When the writing of one block unit is confirmed, the memory address of the compressed audio block writing in the recording buffer memory 28 is recognized by the controller 20 (S6). The memory address value here is S
Since it is assumed at 5 that the writing of the compressed audio block in units of one block is completed, it is obtained as the head memory address value of the compressed audio block to be written next. Next, a memory address for reading the compressed audio block in the recording buffer memory 28 is set (S7).

In the present embodiment, it is assumed that recording is started from audio information that is 0.8 seconds or more as a read preceding time from the time when the recording start instruction is issued by the user. Therefore, the read memory address value set in S7 is obtained as a memory address value corresponding to audio information that has been traced back in the past by two blocks as a compressed audio block with respect to the write memory address value obtained in S6. Can be

Note that one compressed audio block is 0.8
Since this corresponds to seconds, the above-mentioned two blocks have a time of (0.8 × 2 = 1.6 seconds). This allows
From 0.8 seconds to 1.6 seconds after the above-mentioned recording start instruction time, the relationship between the audio information that is traced back in the past and the corresponding address is obtained.

After that, two compressed audio blocks are read from the recording buffer memory 28 and supplied to the recording data processing circuit 29, and recording from the recording block position on the magneto-optical disk 1 corresponding to the recording address Ar is performed. This is performed (S8).

The above operation corresponds to FIG. 1 as follows.

[0098] "S1 operation" as shown in (b) of the figure, the write of the recording buffer memory 28 is started at time t _0.

<< Operations of S4 and S5 >> For example, at time t
_REC i.e. assuming that there is an instruction to start recording of user at the time the audio block A ₃ audio input shown in the same figure (a) is input, the compressed audio shown in the same figure (b) at time t ₃ completion of writing into the recording buffer memory 28 of the block B ₃ is recognized.

<< Operation of S7 >> As a read address of the recording buffer memory 28, the compressed audio block B ₂
Is set.

<< Operation of S8 >> As shown in FIG. 13C, the compressed audio blocks B ₂ and B ₃ stored in the recording buffer memory 28 are compressed audio blocks B ₂ and B _3.
2 ′ · B ₃ ′, and the record is
And the light irradiation of the optical head 13. Thus, the head part of the audio information is recorded.

[2] Recording after the beginning of the audio information When recording of two compressed audio blocks is completed, the recording address Ar is updated (S9). Here, since two blocks have been recorded by S8, the new recording address Ar is replaced with the current recording address A.
Two blocks for the value of r, that is, (15 × 2) = 3
This is a value obtained by adding 0 sectors.

Thereafter, after the writing of one compressed audio block to the recording buffer memory 28 is completed (S10), the first compressed audio block of one block is read from the recording buffer memory 28. Recording is performed at a recording block position on the magneto-optical disk 1 corresponding to the recording address Ar (S11).

Further, the recording address Ar is updated (S12). Here, since the update is for the recording of the compressed audio block, (1 × 15 = 15) the sector is set as a value to which the sector is added. Then, it is determined whether or not there is a recording stop instruction from the user (S13). If there is no stop, the process returns to S10 to repeat the above-described intermittent recording operation.

The above operation corresponds to FIG. 1 as follows.

[0106] As shown in "S10 of operation" in FIG. (C), at time t ₅ to write to the compressed audio blocks B ₄ of the recording buffer memory 28 is completed, the compressed audio block B ₄ is compressed audio Block B ₄ '
Is read from the recording buffer memory 28. Then, the compressed audio block B ₄ ′ is recorded at the position of the recording address Ar on the magneto-optical disk 1. Thereafter, the recording of the compressed audio blocks B ₅ ′, B ₆ ′, B ₇ ′,... Is performed intermittently at the respective times t ₆ , t ₇ , t ₈ ,.

[3] Recording of Management Information On the other hand, if there is a recording stop instruction in S13, the recording start and recording end absolute address position information corresponding to the recording block in which the above recording was performed is updated in the TOC memory 21 ( Is added) (S14). Further, the magneto-optical disk 1
An access operation to the upper TOC area 1a is performed (S1).
5) The contents of the TOC memory 21 are recorded as new management information in the TOC area 1a (S16), and a series of operations ends.

Regarding the subsequent reproduction operation, desired music information is reproduced by the normal continuous compressed audio reproduction operation described above.

As described above, in the present embodiment, the operation of intermittent recording repetition of the compressed audio block using the recording buffer memory 28 is performed, and the read preceding time is set earlier than the time when the recording start instruction is issued. It is designed to record from audio information that goes back to. As a result, even if the user gives a recording start instruction immediately after hearing the beginning of the song, it is possible to prevent the beginning of the song from being lost due to a delay time due to the access operation of the optical head 13 or the like. Also, the silent portion before the start of the song is not recorded unnecessarily long.

In the above operation example, when the stop instruction is given in S13, the recording operation is immediately stopped, but the unrecorded compressed audio block held in the recording buffer memory 28 is recorded. The operation of S14 may be performed after that. In the present embodiment,
Recording is performed from audio information that has been traced back in the past. However, by configuring the operation unit 22 or the like to select or set the above-described read preceding time according to the user's purpose of use or individual differences in operation response speed, etc. , Increasing convenience.

[Embodiment 2] The following will describe a second embodiment in which the present invention is applied to a disk recording / reproducing apparatus with reference to FIG. In this embodiment, components having the same functions as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Also,
The data format and the like relating to recording / reproduction are the same as those described in the first embodiment, so that the description thereof will be omitted for convenience.

As shown in FIG. 11, the disk recording / reproducing apparatus according to the present embodiment further includes a level detecting circuit 35 in addition to the configuration of the disk recording / reproducing apparatus of the first embodiment.

The level detection circuit 35 receives the digital audio information from the A / D converter 26 and monitors the signal level, and finds a portion of the digital audio information from a silent portion to a non-silent portion (non-silent portion) such as between music pieces. Is detected as a recording start corresponding portion and transmitted to the controller 20 '.

The controller 20 'has the functions (1) to (5) of the controller 20 (see FIG. 7) in the first embodiment and the following functions (6)' and (7) '.

(6) ′ Write / Read Control of Memory (Write Control Unit / Second Read Control Unit) Data is read from the recording buffer memory 28 at a speed higher than that of data write. This read is
This is performed on information from before a predetermined time (read preceding time) when the above-described recording start corresponding part is detected. In addition, data writing in blocks and intermittent data reading in blocks are performed.

(7) ′ Recording Control (Second Recording Control Means) The recording start instruction using the detection result of the level detection circuit 35 is related to the basic recording operations described in the first embodiment. To implement.

In the disc recording / reproducing apparatus configured as described above, the description in the first embodiment (S4 in FIG. 10)
), The detection result of the level detection circuit 35 is used instead of the recording start instruction from the operation unit 22. As a result, it is detected that the silence portion corresponding to between the pieces of music of the audio information input from the outside has ended and the actual performance has started. Then, as in the first embodiment, recording is performed from the compressed audio information that has been traced back to the past by the read preceding time, using the detection result as an instruction to start recording.

As described above, in the present embodiment, since the recording start instruction is determined based on the result of monitoring the input continuous information, the convenience is further increased.

As a specific means of the level detection circuit 35, it can be easily implemented by detecting that the signal level of the input audio information exceeds, for example, -60 [dB]. Also, of course, A / D
The above level detection may be performed at the input side of the converter 26, that is, at the analog signal stage.

Further, in the present embodiment and the first embodiment described above, an example was described in which the CD format was used as a basis and the CD format was applied, but the present invention is not limited to such a format. That is, it is needless to say that various forms are possible for the block configuration and the sector configuration, and various forms are also applicable to the address information. In addition, 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.

Further, in the present embodiment, an example using compressed audio information has been described. However, the present invention is not limited to this, and basically, the write side and the read side of the buffer memory are described above. If there is such a difference in information transfer speed, it can be applied in various forms. For example, in the case of the above-described CD format, by increasing the linear velocity of a disc to be higher than usual, conventional uncompressed CD audio information (sampling frequency of 44.1 kHz) is used.
z, the quantization bit 16 bits, and the number of channels 2) 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 gist of the present invention. .

[0123]

As described above, the information recording / reproducing apparatus of the present invention specifies the storage means for storing continuous information and the preparation for recording.
Recording preparation instructing means shown in FIG.
A write control means for writing preparation instruction continuous information from a time point that each block divided into a predetermined size by the write transfer rate in the storage means that, in the recording preparation instruction means
Record the continuous information at the time when
Move the recording means to the absolute address information position on the recording medium
Access control means for instructing recording, recording start instructing means for instructing the start of recording, and continuous information stored in the storage means from a time before a predetermined time at the time of the instruction by the recording start instructing means, from the storage means. A first reading control means for intermittently reading data for each block at a reading transfer speed higher than the read transfer speed, and a second means for recording information read by the control of the first reading control means on the recording medium every time reading is performed. 1 recording control means.

As described above, since the continuous information is temporarily stored in the storage means and the reading speed of the continuous information is set higher than the writing speed, the audio information stored in the storage means is provided when the recording start instruction is issued. Are recorded on the recording medium at once in block units. For this reason, even if the continuous information stored in the recording means is read out and recorded retroactively before a predetermined time at the time when the recording start instructing means instructs, the delay of the read information with respect to the original continuous information. Time only occurs at the beginning of the recording operation.

Therefore, the actual recording operation of the audio information on the recording medium at the time when the end of the recording is instructed can be performed without a large delay time. That is, after the recording end instruction is issued, the recording operation is not continued for a while, and the operability is kept good.

Further, if the user can arbitrarily set the above-mentioned predetermined time, the purpose of use, the form of the music source (CD, FM broadcast, etc.), and the recording start timing of the continuous information to be recorded by the user The recording can be started at an optimal time in accordance with the reaction time from the confirmation of the command to the recording instruction.

If the above configuration is applied to, for example, an audio device, the user listens to a song to be recorded in a recording standby state, and operates the start of recording after confirming that the performance of the song has been started. Then, as described above, the audio information is recorded from the audio information that is specified a predetermined time before the operation is performed. Therefore, recording can be started at an appropriate timing, there is no unnecessary silence at the beginning of the song, and good recording without the beginning of the song can be performed, especially when recording from FM broadcasting etc. Recording operation becomes easier.

Also, when dubbing only a desired song when recording from a package medium such as a CD, it is necessary to check whether the content of the song to be played matches the desired song, and then perform the recording. You can tell it to start. Therefore, it is possible to prevent a mistake such as noticing a music selection error after starting recording as in the related art.

Further, in the recording / reproducing apparatus, there is no need to consider a mechanical operation time required from the time when the recording start instruction is issued until the actual recording start operation is performed.
Therefore, the cost of the mechanism can be avoided without complicating the mechanism.

When the above configuration is applied to an image recording / reproducing apparatus, a user can start recording after confirming image information to be recorded on a television monitor or the like in a recording standby state. Therefore, as in the case of recording the audio information, it is possible to perform the recording without the head loss.

[0131] As described above, another information recording / reproducing apparatus of the present invention comprises a storage means for storing continuous information and a preparation for recording.
Recording preparation instruction means for instructing the recording preparation instruction means.
Preparation and writing control means for instructing causes successive information from a time point written for each block divided into a predetermined size by the write transfer rate in the storage means, in the recording preparation instruction means by
Continuous information should be recorded when the preparation instruction is given
Move the recording means to the absolute address information position on the recording medium
Access control means for moving, a detection means for detecting a portion corresponding to the start of recording in the continuous information, and a continuous information stored in the storage means from a predetermined time or earlier when the corresponding portion to start recording is detected by the detection means. Second read control means for intermittently reading data from the storage means for each block at a read transfer rate higher than the write transfer rate; and recording the information read under the control of the second read control means for each read. And a second recording control means for recording on a medium.

As a result, similarly to the information recording / reproducing apparatus described above, it is possible to perform good recording without a silent portion at the beginning of a song or a truncation of the beginning of a song, and to avoid an increase in cost of a mechanism due to complication. .

If the above configuration is applied to, for example, an audio apparatus, the start of performance of continuous information such as audio information to be recorded is detected by the detecting means as a recording start corresponding section by setting the apparatus in a recording standby state. Recording can be started automatically. As described above, the optimum recording start position is automatically determined, so that the operability can be further improved.

Therefore, if the above two information recording / reproducing devices are employed, it is possible to start recording continuous information at an appropriate position without complicating the mechanism structure and with good operability. It works.

[Brief description of the drawings]

FIG. 1 is a sequence diagram showing a specific operation example when recording music information in a disk 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 devices 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 shown in FIG. 2;

FIG. 4 is an explanatory diagram showing a format of a main data field in a recording / reproducing method adopted in the disk recording / reproducing apparatus according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a block format in a recording / reproducing method adopted in the disk recording / reproducing apparatus according to the first embodiment 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.

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

FIG. 9 is a sequence diagram showing a basic reproducing operation of the disk recording / reproducing apparatus of FIG. 7;

FIG. 10 is a flowchart showing an operation procedure when music information is recorded in the disk recording / reproducing apparatus of FIG. 7;

FIG. 11 is a block diagram showing a schematic configuration of a disk recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 12 is a plan view showing a conventional compact disc.

FIG. 13 is an explanatory diagram showing a format of a frame signal in the compact disc of FIG.

FIG. 14 is an explanatory diagram showing a sector format in the compact disc of FIG.

[Explanation of symbols]

Reference Signs List 1 magneto-optical disk (recording medium) 1b main information area 20 controller (write control means, first read control means, first recording control means , access control means ) 20 'controller (write control means, second read control means) , Second recording control means , access control means ) 22 operation section (recording preparation instructing means, recording start instructing means )
Stage) 28 recording buffer memory (storage means) 35 level detection circuit (detection means)

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-351748 (JP, A) JP-A-5-205394 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G11B 20/10

Claims (2)

(57) [Claims] 1. An information recording / reproducing apparatus for recording / reproducing continuous information on / from a recording medium based on absolute address information, comprising: storage means for storing continuous information; recording preparation instructing means for instructing recording preparation ; a write control means for writing the continuous information from the point at which there is preparation instruction by the recording preparation instruction means for each block divided into a predetermined size by the write transfer rate in the storage means, preparation instruction by the recording preparation instruction means At the time there was
Absolute address information on the recording medium on which the connection information should be recorded
Access control means for moving the recording means to a position, recording start instructing means for instructing the start of recording, and continuous data stored in the storage means for a predetermined time or earlier when instructed by the recording start instructing means First read control means for intermittently reading information from the storage means for each block at a read transfer rate higher than the write transfer rate; and information read under the control of the first read control means for each read. An information recording / reproducing apparatus, comprising: first recording control means for recording on the recording medium. 2. An information recording / reproducing apparatus for recording / reproducing continuous information on / from a recording medium based on absolute address information, comprising: storage means for storing continuous information; recording preparation instructing means for instructing recording preparation ; a write control means for writing the continuous information from the point at which there is preparation instruction by the recording preparation instruction means for each block divided into a predetermined size by the write transfer rate in the storage means, preparation instruction by the recording preparation instruction means At the time there was
Absolute address information on the recording medium on which the connection information should be recorded
Access control means for moving the recording means to a position, detecting means for detecting a portion corresponding to the start of recording in the continuous information , and storage means for a predetermined time or earlier when the corresponding portion to start recording is detected by the detecting means Second read control means for intermittently reading the stored continuous information from the storage means for each block at a read transfer rate higher than the write transfer rate; and information read under control of the second read control means. An information recording / reproducing apparatus, comprising: second recording control means for recording the data on the recording medium every time the data is read.