JPH05109188A - Recording/reproducing method for magnetooptical - Google Patents

Abstract

PURPOSE:To make the simultaneous concurrent processings of reproducing/ recording operations possible by using reproducing/recording memories whose writing speed is operated at a high or a low speed relatively compared with a reading speed. CONSTITUTION:The recording position of reproducing information (A) is searched under the control of a system controller 17 by an optical pick-up 3. Then during a second reproducing operation, a first reproducing operation is executed, then during the second reproducing operation, the second reproducing operation is executed and a first recording operation is executed, as well and then, within the period of the second reproducing operation the process of executing a second recording operation is repeated synchronized with a second reproducing cycle. Thus, other information is recorded simultaneously on the surface during reproducing information from the same magnetooptical disk.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an MD (mini disc).
The present invention relates to a recording / reproducing method for a writable magneto-optical disc, and more particularly to a recording / reproducing method for a partially recorded disc.

[0002]

2. Description of the Related Art When two or more types of music information such as music and voice are combined and processed into one music information, a method called mixing is used. Generally, when mixing is performed, a dedicated device called a mixer is used. For example, CD
Playing stereo music information from a (compact disc) or VD (video disc) and combining the R channel and L channel music information into a monaural sound is also a kind of mixing, and is played back from a CD or the like. Mixing is also the mixing of other sounds into the sound. In either case, a mixer was indispensable for performing mixing using a disk-shaped storage medium, regardless of the size of the device configuration.

On the other hand, a method of recording other music information on the same recording medium in accordance with certain music information is known by a so-called post-recording method. This dubbing is also a kind of mixing in a broad sense, and the operation of mixing two or more pieces of music information is the same as the above mixing. A mixer is also required for this post-recording.

[0004]

The above-mentioned mixing and post-recording method is a method of temporarily reproducing information on a recording medium, mixing the reproduced signal, and then re-recording the mixed information on a separately prepared recording medium. Is taken. This is because there is a time lag from the reading of information from the recording medium to the reproduction, and it is impossible to record at the same position as the structure of the pickup or head for recording / reproducing.

Thus, in the case of a disk-shaped storage medium,
Conventionally, it has been impossible to record other music information in real time on the recording medium being reproduced in accordance with the reproduced music information. Therefore, an object of the present invention is to provide a recording / reproducing method capable of apparently recording other information in real time on a writable magneto-optical disk in accordance with reproduction information from the magneto-optical disk. To do.

[0006]

In order to solve the above-mentioned problems, the present invention reads information from a writable magneto-optical disk recorded area at high speed and writes the read information into a reproducing memory at high speed. (1) a reproducing operation, a second reproducing operation of reading the stored information from the reproducing memory at a low speed and reproducing and outputting the read information at a low speed, and a first operation of writing externally input information into the recording memory at a low speed A recording operation and a second recording operation for reading the stored information from the recording memory at a high speed and recording the read information in an unrecorded area of the magneto-optical disk at a high speed, during the second reproducing operation period. The first reproducing operation is executed, the first recording operation is executed together with the execution of the second reproducing operation during the next second reproducing operation period, and then the second reproducing operation is performed within the next second reproducing operation period. The second recording operation The process of line, configured to repeat in synchronization with the second reproduction operation cycle.

[0007]

According to the present invention, the reproducing memory operates at a relatively high writing speed as compared with the reading speed, and conversely, the writing speed is relatively low compared with the reading speed. An operating recording memory is used, and the spare time generated by the difference in these operating speeds is utilized to enable simultaneous apparent parallel processing of the reproducing operation and the recording operation in real time.

That is, information (for example, karaoke accompaniment) from the recorded area of the magneto-optical disk at the input side of the reproducing memory during the second reproducing operation having a relatively long time executed at the output side of the reproducing memory. Is read at high speed and the first reproducing operation of writing the information into the reproducing memory is performed. That is, the processing on the output side of the reproduction memory is completely unrelated to the reading operation of the magneto-optical disk, and each independent operation is possible. This also applies to the recording memory described later. On the other hand, the reading of information from the magneto-optical disk is fast, and the pickup of the magneto-optical disk can perform other operations within the frame of the second reproducing operation period. Therefore, information input from the outside during the second reproduction operation period (for example,
The singing voice sung along with the karaoke accompaniment) is written to the recording memory. This writing operation is slow, and the time and timing required for the second reproducing operation are matched. During that time, the information (singing voice) previously stored in the recording memory is recorded at high speed in the unrecorded area of the magneto-optical disk. The above operation is the second reproduction operation (second recording operation).
By repeating the above sequence with the period of 1 as one cycle, it is possible to post-record to the same recording medium in real time.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described with reference to the drawings. [I] Writable Magneto-Optical Disk Recording / Reproducing Apparatus FIG. 1 shows an example of a recording / reproducing apparatus for a magneto-optical disk 1 such as an MD to which the present invention is applied. This recording / reproducing apparatus is roughly classified into a reproducing system for reproducing information from the magneto-optical disk 1, a recording system for recording information on the magneto-optical disk 1, a rotary system for driving rotation of the magneto-optical disk 1, the reproducing system, It has a control system that controls the recording system and rotation system.

The magneto-optical disk 1 has a magnetic film and records a digital format signal by utilizing the rotation of the polarization plane of the laser beam due to the magnetic Kerr effect. It is a digital signal recording medium and is known as MD. This magneto-optical disk 1 is a partially recorded disk, and will be described later with reference to FIG.
As shown in, information already exists (for example, karaoke accompaniment information).
The recorded area in which is recorded is different from the unrecorded area in which nothing is recorded yet and information (for example, singing voice information sung along with the karaoke accompaniment) is recorded by a method described later. It is arranged.

In the reproducing system, the optical pickup 3 is moved to its reading position by a carriage motor or an actuator (not shown), irradiates the magneto-optical disk 1 with a laser beam, and photoelectrically converts the return beam into an RF signal. Output to the reproduction unit 5. The reproducing unit 5 amplifies the RF signal by R
F amplifier, ATIP (Absolute Tim) included in RF signal
e In Pregroove) It has an ATIP decoder for decoding data, outputs an RF signal to the EFM decoder 6, and outputs control data such as ATIP data to the system controller 17. The EFM decoder 6 stores information recorded on the magneto-optical disk 1 in EFM (Eight
Since it is modulated, it is for demodulating it.
To the reproduction memory 8 via. The changeover switch 7 is for changing over the recording / reproducing operation described later. The reproduction memory 8 is a DRAM (Dynamic Random AccessMem) that operates at a relatively high writing speed compared to the reading speed.
ory), and for example, a dual port DRAM having a storage capacity of about 1 Mbit is used. The read information from the reproduction memory 8 is sent to the compression decoder 9. The compression decoder 9 compresses the information recorded in the magneto-optical disk 1 in consideration of the minimum audible limit of human beings and the masking effect (for example, about ⅕ of the case of a CD). It is a decoder for double expansion. The expanded digital data is converted into an analog signal by the D / A converter 10. This analog signal is supplied to the power amplifier and the speaker via the output terminal OUT and reaches the human ear as an acoustic signal.

In the recording system, an analog signal from a microphone or the like is externally input to the input terminal IN and the A / D
It is input to the converter 11. The A / D converter 11 performs A / D conversion on the input analog signal, and the compression encoder 12
Send to. The compression encoder 12 is the compression decoder 9 described above.
The reverse operation is performed, and the input data is compressed to, for example, about 1/5 of the CD data and sent to the recording memory 13.
The recording memory 13 is a DRA that operates at a relatively low writing speed (reverse to the reproducing memory 8) as compared with the reading speed.
M, and also a dual port DRA of about 1 Mbit
M is used. The read information from the recording memory 13 is given to the EFM encoder 15 via the changeover switch 14. The EFM encoder 15 EFM-modulates the input data and sends it to the recording unit 16. The recording unit 16 has an ATIP encoder, a drive circuit for the laser diode of the optical pickup 3, a drive circuit for the magnetic head 4, and the like, and drives the optical pickup 3 and the magnetic head 4 according to an input recording signal.

The rotating system has a spindle motor 2 for rotating the magneto-optical disk 1 at a required number of rotations. The rotating shaft of the spindle motor 2 is connected to a turntable (not shown), and the magneto-optical disk 1 is rotated by being sandwiched by the turntable.

The control system has a system controller 17 and a servo circuit 20. The system controller 17 comprehensively controls the operation of each part of the recording / reproducing apparatus in an operation mode according to an operation command given from the input device 18, and a microcomputer (μCO
M) is used. Further, necessary display information is displayed from the system controller 17 through the display device 19.
The system controller 17 gives various control data such as P _{1 to} P ₄ and R _{1 to} R ₄ to each element at a necessary timing according to a program sequence stored in a built-in program memory (ROM: Read Only Memory or the like), The servo control signal SC is also applied to the servo circuit 20. The servo circuit 20 outputs a spindle servo signal SS, a focus servo signal FS, a tracking servo signal TS, and a magnetic head servo signal HS according to the inputted servo control signal SC. These servo control signal SC, spindle servo signal SS, focus servo signal FS, tracking servo signal TS, and magnetic head servo signal HS properly control the recording / reproducing position of the optical pickup 3 on the magneto-optical disk 1.

[II] Recording / Reproducing Method (Operation) Next, the recording / reproducing method according to the present invention in the configuration of the recording / reproducing apparatus will be described.

The recording / reproducing operation in the present invention apparently (when observed from the outside) is performed simultaneously in real time on the same storage medium, and is roughly classified into the first reproducing operation PLY1 and the second reproducing operation. The reproduction operation PLY2, the first recording operation REC1, and the second recording operation REC2 are classified.

In the first reproducing operation PLY1, the optical pickup 3 reads information from the recorded area RD of the magneto-optical disk 1 at high speed, and the read information is reproduced through the reproducing section 5, the EFM decoder 6 and the changeover switch 7. This is a high-speed writing operation to the memory 8 for use.

The second reproducing operation PLY2 is the reproducing memory 8
This is an operation of reading the information stored in the storage device at low speed and outputting the read information from the output terminal OUT via the compression decoder 9 and the D / A converter 10.

The first recording operation REC1 is an operation for writing the input information inputted from the input terminal IN into the recording memory 13 at a low speed via the A / D converter 11 and the compression encoder 12.

The second recording operation REC2 is performed by the recording memory 1
The information stored in No. 3 is read at high speed, and the read information is changed over to the changeover switch 14, the EFM encoder 15, the recording unit 1.
This is an operation of recording in the unrecorded area NRD of the magneto-optical disk 1 by the magnetic head 4 and the optical pickup 3 via 6.

FIG. 2 shows the sequence of the recording / playback operation according to the present invention. This sequence is executed by the program stored in the ROM in the system controller 17.

In this example, the magneto-optical disk 1
Is a partially recorded disk, the TOC (Table of Contents) data for the recorded area RD is written in the TOC area in the lead-in of the magneto-optical disk 1, but for the unrecorded area NRD. No TOC is written, and the magneto-optical disc 1 is a disc that has not been finalized. Finalization is performed at the time when recording in the unrecorded area NRD is completed, and thereafter,
The magneto-optical disk 1 is prevented from being overwritten. As a means for prohibiting overwrite, for example, T
A method such as writing a prohibition flag in the OC data is possible.

Hereinafter, the recorded area RD of the magneto-optical disk 1 will be described.
From the karaoke accompaniment data to A, B, C, for example, at intervals of the storage capacity (1 Mbit) of the reproduction memory 8.
D, ..., N are reproduced, and at this time, the singing voice sung along with this karaoke accompaniment is a, b,
The operation will be described by taking as an example the case of inputting such as c, d, ..., N.

As shown in FIG. 2A, first, the optical pickup 3 searches the recording position of the reproduction information A under the control of the system controller 17. Next, the reproduction information A is read, and the reproduction unit 5, the EFM decoder 6,
The reproduction information A is written in the reproduction memory 8 via the changeover switch 7 (at this time, the changeover switch 7 is close and the changeover switch 14 is open) (first reproduction operation PLY1).

Next, the reproduction information A is read from the reproduction memory 8 and reproduced and output from the output terminal OUT via the compression decoder 9 and the D / A converter 10 (second reproduction operation P).
LY2).

The reproduction information A is reproduced by the second reproduction operation PLY2.
When the karaoke accompaniment corresponding to starts, the singer sings along with the accompaniment. The singing voice is converted into an electric signal by a microphone and input from the input terminal IN. Then, the input signal is written in the recording memory 13 via the A / D converter 11 and the compression encoder 12 (first recording operation REC1). The time of the first recording operation REC1 is synchronized with the second reproducing operation PLY2 and has the same time length.

On the other hand, during the period of the second reproduction operation PLY2 or the first recording operation REC1, the optical pickup 3 is free and searches for the recording position of the reproduction information B to be reproduced next. Subsequently, the optical pickup 3 reads the reproduction information B and executes the first reproduction operation PLY1. After reading the reproduction information B, the second reproduction operation P for the reproduction information B is performed.
LY2 is executed, and at the same time, the first recording operation R of the recording information b
EC1 is executed. During the period of the second reproduction operation PLY2 (or the first recording operation REC1 for the recorded information b) of the reproduced information B, the optical pickup 3 records the recorded information a.
The recording position of the unrecorded area NRD of the magneto-optical disk 1 to be recorded is searched, and if detected, the recording memory 1
3, the recording information b is read out, and the magneto-optical disk 1 is passed through the changeover switch 14 (close at this time), the EFM encoder 15, the recording unit 16, the optical pickup 3, and the magnetic head 4.
The data is recorded in the unrecorded area NRD.

Next, the optical pickup 3 searches the position of C to be reproduced next in the recorded area RD of the magneto-optical disk 1, and when it is detected, the reproduction information C is read and written in the reproduction memory 8 (first). Playback operation PLY1).

In this way, the reproduction information A
The second reproduction operation PLY of the reproduction information A during the period of the reproduction operation PLY1 and the second reproduction operation PLY2 for the next reproduction information A.
2 and the first recording operation REC1 of the recording information a, the first reproduction operation PLY1 of the reproduction information B is performed, and the second reproduction operation of the reproduction information B is performed in the period of the second reproduction operation PLY2 of the next reproduction information B. The first recording operation REC1 for the PLY2 and the recording information b is performed, and the second recording operation REC2 for the recording information a and the first reproducing operation PLY1 for the reproducing information C are performed. Next, the second reproduction operation PL of the reproduction information C
While the first recording operation REC1 of the recording information c is performed in the period of Y2, the recording / reproducing operation is performed in the sequence of the second recording operation REC2 of the recording information b and the first reproducing operation PLY1 of the reproduction information D.

FIG. 3 shows the movement of the optical pickup 3 during the above operation. As can be seen from FIG. 3, the optical pickup 3 performs reading in the recorded area RD (first reproduction operation PLY1), search, and unrecorded area NRD.
The reciprocating motion is performed in the radial direction of the magneto-optical disk 1 in a combination pattern of recording (first recording operation REC1).

By the above recording / reproducing operation, the recorded area R
Unrecorded area NRD of singing voice according to karaoke accompaniment in D
At the time when the recording to the end is completed, the head address data of the recording information a is recorded in the TOC area together with the information indicating that the magneto-optical disk 1 is an after-recording disk and finalized.

Next, when reproducing this dubbing disc, although not shown, the RAM 1 for data of A, B, C, D, ..., N and the data of a, b, c, d ,. R
AM2 is provided (not shown) so that RAM1 and RAM2 can be operated alternately and an adder for adding output data of both RAM1 and RAM2 is connected. When reproducing, first the TOC data is read and the compression decoder 9
The top address of the RAM is read and the reproduction information A is stored in the RAM1.
Then, the compression decoder 9 is searched and the recording information a is stored in the RAM 2. When both data reproduction information A and the compression decoder 9 are prepared, the reproduction information A and the compression decoder 9 are given to the adder to reproduce the reproduction information. Data of A + recording information a is generated and output. As a result, reproduction information A + recording information a
Is played back. By utilizing the expansion time of the data of the reproduction information A + recorded information a by the compression decoder 9, the next reproduction information B is written in the RAM 1 and the compression decoder 9
End address (that is, the start address of recorded information b)
The recording information b is searched by and written in the RAM 2, the data of the reproduction information B + recording information b is generated through the adder, reproduced and output, and so on, until the end of all data.

[0033]

As described above, according to the present invention, it is possible to record other information apparently simultaneously while reproducing information from the same magneto-optical disk.

[Brief description of drawings]

FIG. 1 is a block diagram of a magneto-optical disk recording / reproducing apparatus to which the present invention is applied.

FIG. 2 is a time chart showing a recording / reproducing operation sequence of the present invention.

FIG. 3 is a diagram illustrating the operation of the optical pickup 3.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magneto-optical disc 2 ... Spindle motor 3 ... Optical pickup 4 ... Magnetic head 5 ... Reproduction part 6 ... EFM decoder 7 ... Changeover switch 8 ... Reproduction memory 9 ... Compression decoder 10 ... D / A converter 11 ... A / D converter 12 ... Compression encoder 13 ... Recording memory 14 ... Changeover switch 15 ... EFM encoder 16 ... Recording unit 17 ... System controller 18 ... Input device 19 ... Display device 20 ... Servo circuit A, B, C, D, ..., N ... Playback information a, b, c, d, ..., n ... recording information P ₁ ... reproduced RF signal and a reproduction control signal P ₂ ... control signal P ₃ ... changeover control signal P ₄ ... memory control signal R ₁ ... recording control signal R ₂ ... control signal R ₃ ... changeover control signal R ₄ ... memory control signal IN ... input Child OUT ... Output terminal SS ... Spindle servo signal FS ... Focus servo signal TS ... Tracking servo signal HS ... Magnetic head servo signal REC1 ... First recording operation REC2 ... Second recording operation PLY1 ... First reproducing operation PLY2 ... Second reproducing operation RD ... recorded area NRD ... unrecorded area

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Izumi Ueda 4-2610 Hanazono, Tokorozawa, Saitama Prefecture Pioneer Co., Ltd. Tokorozawa factory (72) Eiji Muramatsu 4-2610 Hanazono, Tokorozawa, Saitama Pioneer Co., Ltd. Tokorozawa Plant (72) Inventor Takahiro Okajima 4-2610 Hanazono, Saitama Prefecture Pioneer Co., Ltd. Tokorozawa Plant (72) Inventor Hidehiro Ishii 4-2610 Hanazono, Tokorozawa Saitama Pioneer Co., Ltd. Tokorozawa Plant (72) Inventor Toshihiro Maehara 4-2610 Hanazono, Tokorozawa, Saitama Pioneer Co., Ltd. Tokorozawa Plant (72) Inventor Hitoshi Kasama 4-2610 Hanazono, Tokorozawa, Saitama Pioneer Co., Ltd. Tokorozawa Plant

Claims (1)

[Claims] 1. A first reproducing operation for reading information from a writable magneto-optical disk recorded area at a high speed and writing the read information to a reproducing memory at a high speed, and storing information from the reproducing memory at a low speed. A second reproducing operation of reading and reproducing and outputting the read information at a low speed, a first recording operation of writing externally input information into a recording memory at a low speed, and reading the stored information from the recording memory at a high speed A second recording operation of recording the read information in an unrecorded area of the magneto-optical disc at a high speed, and executing the first reproducing operation during the second reproducing operation period,
A process of executing the first recording operation together with the execution of the second reproducing operation during the next second reproducing operation period, and then executing the second recording operation within the next second reproducing operation period; A recording / reproducing method for a magneto-optical disk, which is repeated in synchronization with the second reproducing operation cycle.