JP2843103B2 - Information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention records / reproduces information on / from various recording media such as rewritable optical disks, and temporarily suspends recording / reproduction of information by a still jump. The present invention relates to an information recording / reproducing apparatus having a function of causing the information recording / reproducing apparatus to perform the function.

[Conventional technology]

Conventionally, continuous information such as music information (hereinafter, character information such as a document file is referred to as discrete information with respect to continuous information) is recorded as a digital signal by optically detectable minute pits. So-called compact discs (hereinafter referred to as CDs) are widely used.
This CD is reproduced by a reproduction-only optical disk reproducing device.

In the signal format used in the CD, the subcode included in one frame is configured to be completed by forming a subcoding block with 98 frames corresponding to one sector. The subcoding block provides sector information as an address (recording / reproducing position information) on the disk, and additional information such as a track number (called a music number when the main information is music information). The frame frequency is set to 7.35 kHz, and the sector frequency is 7
It is set to 5Hz. Therefore, the length of one sector is 1/75 second in time, that is, about 13.3 ms. The sector position on the disk is determined based on the recording start position on the innermost side of the disk as “minute”: “second”: “sector number within one second (ie,
0 to 74) is represented as continuous time information or position information sequentially increasing from the innermost circumference of the disk. Recording / reproduction of information is a block in which several sectors are grouped. Is performed as a minimum unit.

According to the above format, the CD player uses the TOC (Table
The additional information in the (of Contents) area is read, the number of each piece of main information (corresponding to the number of songs in the case of music information) and the like are recognized, and the recording start position is recognized by the information on the sector position. In response to a subsequent reproduction instruction, access to a desired track is promptly executed by comparing information in the TOC area with information on a sector position provided by the sub-coding block.

In addition, the disc rotation control of the CD player is performed so that the CLV (C
onstant Linear Velocity) control is performed.

On the other hand, when recording / reproducing various information such as music information or computer information on a rewritable optical disc such as a magneto-optical disc which has been developed in recent years, the reproducing method of the information recording / reproducing apparatus is a conventional CD or CD. −ROM (Compa
ct Disk Read Only Memory) and have compatibility. In this case, especially in an initial disc on which no information is recorded, position information using a subcode according to the CD signal format, or
Since there is no frame synchronization signal used for CLV control, access to any sector position prior to recording cannot be performed, and the CLV required for recording and
Control becomes impossible.

Therefore, a method is adopted in which an address on a disk is not given by the subcode but an address is formed on the disk in some physical form. For example, the information on the sector position is represented by a biphase mark (Biφ).
After the modulation, the information of the sector position is obtained by shifting the guide groove of the optical disk inward or outward in the disk radial direction or changing the width of the guide groove according to whether each bit is "0" or "1". A method has been proposed (JP-A-64
-39632).

In that case, the frequency band of the guide groove morphological change due to biphase mark modulation and the EFM (Eight to Fourteen Modur
ation) If the frequency band of the modulated recording increase is made different, it is possible to reproduce them separately from each other. As a result, an access operation can be performed to an area having no subcode information by using an address physically recorded due to a deviation of the guide groove or the like. Also, in CLV control, accurate speed control is possible by using a reproduced carrier component such as deviation of the guide groove, and this CLV control can be performed even during recording.

A rewritable optical disk compatible with a CD as described above is a form in which a variety of information such as text information in addition to music information can be efficiently recorded on a single disk, particularly as an information recording medium for home use. It is desirable that

By the way, in an information recording / reproducing apparatus having a recording / reproducing pause function, the pause is generally performed by a so-called still jump method. In this method, a means for detecting one pulse in one rotation of a spindle motor for rotating a disk is provided, and when the information recording / reproducing apparatus receives a pause command, tracking is performed when the above pulse is detected. The recording means jumps one track toward the inner circumference. Also, while searching for a desired block to start recording and waiting for a recording start instruction, a still jump is performed on a track including the desired block and the system waits. The recording / reproduction operation starts when the information recording / reproduction device receives the recording / reproduction start command.

In such an information recording / reproducing apparatus, in the pause operation, although the position (sector position) on the track where the recording means makes a still jump is determined, a pulse is detected at that position after a pause command is issued. until,
There is a shift of up to one track. Further, new recording after the pause is started from an unspecified sector position on the preceding track for one round in which the still jump is performed. As described above, the recording restart position has an error of ± track from the time when the pause command is issued. Therefore, if recording starts immediately after receiving the recording start command,
If an error of -1 track occurs, the preceding recording is overwritten and lost, and if an error of +1 track occurs, unnecessary preceding recording remains.

Therefore, in order to perform recording from a desired sector position, the address of the sector to start recording is stored, and when the above address is recognized, a still jump is performed, and the above address is recognized. An information recording / reproducing apparatus in which a recording operation is started when the information is recorded is considered.

[Problems to be solved by the invention]

However, in the above information recording / reproducing apparatus, if there is a recording start command, it takes time to access an address of a desired sector position until the recording means starts recording, so that continuous information during that time is recorded. Not done. For example, if a recording start command is issued immediately after a standby still jump is performed, continuous information for one round of a track is not recorded. Taking the CLV control method of a CD player as an example, the disk rotation speed when the recording means tracks the inner circumference side is about 500 rpm, and it takes 120 ms per rotation. The continuous information for one round of the track that is not recorded, that is, when converted into the number of sectors,
Since it is 13.3 ms, it corresponds to about 9 sectors. On the other hand, the disk rotation speed when the recording means tracks the outer peripheral side is about
Since it is 200 rpm, it takes 300 ms per rotation, and continuous information for one round of a track that is not recorded corresponds to less than 23 sectors.

As described above, since the continuous information immediately after the start of recording is not recorded for a short period of time, so-called headless recording is performed, giving a sense of discontinuity in auditory sense when performing continuous reproduction. have.

An object of the present invention is to provide an information recording / reproducing apparatus capable of recording continuous information from a desired sector position without losing it.

[Means for solving the problem]

In order to solve the above-mentioned problems, an information recording / reproducing apparatus according to the present invention provides an information recording / reproducing apparatus in which an address necessary for recording / reproducing is recorded in advance by a physical form change, for example, a guide groove deviation corresponding to biphase mark modulation. In an information recording / reproducing apparatus having a function of performing recording / reproducing of information on a recording medium and temporarily stopping recording / reproducing by a still jump of a recording unit, temporarily evacuating continuous information input from the outside. Buffer storage means, for example, a buffer memory, recording means for reading continuous information from the buffer storage means and performing a recording operation on the optical recording medium, and address recognition for recognizing an address recorded on the optical recording medium as needed Means, for example, a pre-recorded information detection circuit and an address detection circuit, and the buffer upon receiving a recording start command. Writing of recording information into the recording means is started, and when the address recognized by the address recognizing means coincides with a desired address for starting recording, reading of the recording information from the buffer storage means is started. Control means for performing a recording operation on the optical recording medium and stopping the recording operation after recording on the optical recording medium the last read continuous information left on the buffer storage means at the time of receiving the recording end instruction. And a controller.

(Operation)

According to the above configuration, when the recording / reproducing device receives a recording start command of continuous information such as music information, the control unit temporarily saves the continuous information in the buffer recording unit, and the continuous information is recognized by the address recognition unit. After the address coincides with the desired address at which recording is to be started, reading of recording information from the buffer recording means is started, and the recording means is caused to perform a recording operation.

Further, the control means stops the recording operation after recording the unread continuous information left on the buffer storage means on the optical recording medium when receiving the recording end instruction.

Thereby, the recording from the desired recording start address on the optical recording medium is performed in a state where the head is not missing in response to the recording start instruction, and the continuous recording on the optical recording medium is performed in response to the recording end instruction. The recording of the target information is performed in a state where the butt is not cut off.

Therefore, according to the information recording / reproducing apparatus of the present invention,
It is possible to realize a recording operation without head and tail cuts corresponding to the recording information recording start and end commands, and it is possible to perform recording without losing continuous information from a desired sector position.

〔Example〕

One embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

As shown in FIG. 4, a magneto-optical disk (optical recording medium) 1 as a rewritable recording medium has an information recording area.
1b and a TOC region 1a on the inner peripheral side thereof. In the information recording area 1b, various information such as music information, characters, images, code data, and the like are recorded with a block composed of a set of several sectors as a minimum unit. In the TOC area 1a, additional information relating to each information recorded in the information recording area 1b, for example, a start block position and an end block position for each information is recorded.

As shown in FIG. 5, spiral guide grooves 2 (shown by hatching for convenience) are formed in the TOC area 1a and the information recording area 1b at predetermined intervals in the disk radial direction. . The address as the recording / reproducing position information on the disc is a bi-phase mark (Biφ).
The information is recorded by shifting the guide grooves 2 to the outside or inside in the radial direction of the magneto-optical disk 1 in accordance with the modulated position information "1" or "0". The above address is also used as rotation control information when performing CLV control or the like. One of the addresses in the present embodiment is one of the sectors in the recording format of the compact disc.
It corresponds to one.

FIG. 2 is a block diagram showing an information recording / reproducing apparatus for recording / reproducing information on the magneto-optical disk 1 as described above. The information recording / reproducing apparatus includes a spindle motor 3 for rotating the magneto-optical disk 1 under CLV control, an optical head 4 as recording / reproducing means for irradiating the magneto-optical disk 1 with laser light during recording and reproduction. And a coil 5 as recording means for applying a magnetic field to the magneto-optical disk 1 during recording. The optical head 4 and the coil 5 record discrete information such as character information or continuous information such as music information under the control of the system controller 13. Further, when recording is started from a stopped state or when recording / reproduction is paused, the optical head 4 keeps the optical head 4 at a predetermined sector position until a recording / reproduction start command is issued, as will be described in detail later. It is configured to perform a so-called still jump, which repeats jumping back to the inner circumference of the track.

The information recording / reproducing apparatus of this embodiment is configured to perform recording by a so-called magnetic field modulation method, and is capable of performing overwriting for recording new information on top of recorded information. The information recording / reproducing apparatus further includes a terminal 6 connected to a higher-level device such as a so-called personal computer. It exchanges digital signals such as image information. Continuous information to be recorded, for example, an analog signal such as music information is input from an external audio device or the like via an input terminal 22.

For example, in the case of recording music information, when an information recording / reproducing apparatus receives a recording command from a higher-level device, an analog signal input from an input terminal 22 is converted into digital data i by an A / D (analog / digital) converter 21. The data is converted and temporarily written to the buffer memory 25. The buffer memory 25 has a storage capacity equivalent to one rotation of the magneto-optical disk 1. When the address of the desired recording start block is supplied from the address detection circuit 12 to the system controller 13, the so-called first-in first-out system (FIFO: first
-In first-out), the music information temporarily saved in the buffer memory 25 is sequentially read out as digital data g, and supplied to the recording signal processing circuit 7 as digital data h via the switching circuit 19.

The signal processing in the recording signal processing circuit 7 is as follows. That is, an error detection / correction parity is generated and added to the digital data h, and the subcode information generated by the subcode generation circuit 17 is added.
(Eight to Fourteen Modulation)
A recording signal is generated by adding a frame synchronization signal.
This recording signal is supplied to the coil driver 8. Recording of information is performed by driving the coil 5 based on the supplied recording signal by the coil driver 8 and simultaneously irradiating the magneto-optical disk 1 with the laser beam of recording output by the optical head 4. The signal format here may be the same as the signal format of a CD as described in the conventional example.

On the other hand, when recording discrete information such as character information, the discrete information output from the host device is converted into digital data f via the terminal 6 and the interface 18 by a switching circuit.
Supplied to 19. The switching circuit 19 provides a sector data generation circuit 20 in units of, for example, one block of the digital data f.
From the digital data h
To the recording signal processing circuit 7. Hereinafter, the recording signal generation processing is performed in the same procedure as described above.

The signal reproduced by the optical head 4 is amplified by the reproduction amplifier 10 and sent to the prerecorded information detection circuit 11 and the reproduction signal processing circuit 15. The prerecorded information detection circuit 11 (address recognition means) includes, for example, a bandpass filter and a PLL (Phase
Locked Loop). The band-pass filter extracts a reproduction signal (corresponding to a bi-phase mark modulation signal) of the deviation of the guide groove having a frequency band of about 22 kHz, for example, and outputs it to an address detection circuit (address recognition means). The PLL generates a clock synchronized with the reproduced signal of the deviation of the guide groove, and supplies the clock to the CLV control circuit 9.

The CLV control circuit 9 compares the synchronization clock supplied from the PLL of the prerecorded information detection circuit 11 with a reference frequency stored therein, and controls the rotation of the spindle motor 3 based on the difference signal. Has become. Thereby, accurate CLV control is realized.

The address detection circuit 12 includes, for example, a biphase mark demodulation circuit and an address decoder. The bi-phase mark demodulation circuit performs a bi-phase mark demodulation of the reproduction signal of the deviation of the guide groove, and the address decoder converts the data after the bi-phase mark demodulation into position information on the disk.
That is, it is decoded into an address and supplied to the system controller 13 as a control unit and a comparison unit.

The reproduction signal processing circuit 15 performs EFM demodulation of the magneto-optical signal component in the reproduction signal supplied from the reproduction amplifier 10, and further performs error detection and correction processing using parity for error detection and correction. If the reproduced signal data is music information or the like, a D / A (digital / analog) converter 23
And output to an external audio device or the like via an output terminal 24 as analog music information or the like.

The subcode information EFM-demodulated by the reproduction signal processing circuit 15 is supplied to a subcode detection circuit 16, and the subcode information recognized by the subcode detection circuit 16 is supplied to a system controller 13. The system controller 13 records from the host device via the terminal 6 and the interface 18,
Instructions such as reproduction and pause are received. Further, the system controller 13 recognizes the position of the optical head 4 on the magneto-optical disk 1 based on the address supplied from the address detection circuit 12, and
Has an access function of instructing a moving mechanism (not shown) to move the optical head 4 and the coil 5 to predetermined positions.

Further, the system controller 13 selects the subcode information supplied from the subcode detection circuit 16 and stores the selected subcode information in the TOC memory 14 as storage means, or the TOC content from the higher-level device provided via the interface 18. Information etc. in the TOC memory 14
Can be read at any time.

The subcode information in the TOC memory 14 is supplied to a subcode generation circuit 17 as necessary, where the subcode is generated, EFM-modulated by a recording signal processing circuit 7, and supplied to a coil driver 8. . This allows the TOC memory 14
Are recorded in the TOC area 1a of the magneto-optical disk 1.

A series of control operations in the case where the system controller 13 receives a command from the host device and causes the information recording / reproducing device to record music information will be described below with reference to the flowchart of FIG.

As shown in FIG. 1 (a), at step (hereinafter referred to as S) 0, when the system controller 13 receives a seek instruction from a higher-level device prior to recording and specifies a block number to start recording. The seek block number is converted into the corresponding address As and stored in the TOC memory 14. Next, the system controller 13 moves the optical head 4 and the coil 5 while seeking (searching) the position of the address As (S1), and moves the optical head 4 and the coil 5 having detected the address As to the inner circumferential side of one track. (S2).
Thereafter, the address Sn is continuously supplied from the address detection circuit 12 (S3), and when the address Sn becomes equal to the address As (S4), that is, every time the address As is detected, the process returns to S2 to perform the still jump (S3). (One rotation / one rotation). The still jump is repeated until a recording start command is issued.

When the recording start command is received in S5, the block number of the recording start / end scheduled specified by the host device is converted into the corresponding address As / Ae and stored in the TOC memory 14 (S6). At the same time, music information input from an external audio device or the like via the input terminal 22 is written to the buffer memory 25 via the A / D converter 21 (S7), and the timer is reset to start timing (S8). ). Further, the system controller 13 recognizes the continuously supplied address Sn (S9) and compares it with the address As when it becomes equal (S1).
0), reading of the music information temporarily saved by the FIFO method from the buffer memory 25 is started (S11). At this time, the timer is stopped, and the required time td after receiving the recording start command is stored in the TOC memory 14 (S12).

The optical head 4 and the coil 5 start the recording operation from the block starting with the address As (S13). If there is no recording stop command in S14, the system controller 13 recognizes the continuously supplied address Sn (S15), compares it with the address Ae of the block scheduled to end recording (S16). Writing of music information to the memory 25 is stopped (S17). Then, the recording operation is ended (S19) when the time counted by the reset timer becomes equal to the desired time td read from the TOC memory 14 (S18). At the same time, reading from the buffer memory 25 is also stopped (S20).

The time lapse of writing and reading of music information in the buffer memory 25 will be specifically described with reference to the timing chart of FIG. At the same time there is a recording start command from the host device at time t _0, it begins writing to the buffer memory 25. At the time of address Sn is equal to the address As time t ₁ from time to time recognized, starts reading from the buffer memory 25, the recording operation is performed (the required time td = t ₁
−t ₀ ). Address Sn from time to time recognized at the point of time becomes equal to the address Ae t _2, writing into the buffer memory 25 is stopped. Furthermore, the time required recording operation from the time t ₂
Until td elapses, the music information is continuously read from the buffer memory 25 while being read. From time to time t ₂
at the time td has become time elapsed t _3, the buffer memory 25
Is stopped, and the recording operation ends.

Next, if there is a recording pause command in S14, the first
As shown in FIG. 2B, the system controller 13 stops writing music information to the buffer memory 25 (S2).
1). Then, the recording operation is interrupted (S23) when the required time td previously obtained by counting the time of the reset timer becomes equal (S22). At the same time, buffer memory 2
Reading from 5 is also stopped (S24). At this time, the system controller 13 stores the address As supplied from the address detection circuit 12 when the recording is interrupted, in the TOC memory 14.
(S25), and instructs the moving mechanism to cause the optical head 4 to make a still jump (S26). Even after the optical head 4 jumps to the inner circumference side by one track, the system controller 13 recognizes the address Sn as needed (S27), and at the same time, reads the address As stored in the TOC memory 14 as needed. Are compared (S28). Sn = As
Then, the process returns to S26 to execute a still jump. The still jump operation in S26 to S28 is performed until a command to resume recording is issued from the higher-level device in S29, or in S30.
Is repeated until there is a recording end command from the host device.
If there is an instruction to resume recording in S29, the process returns to S7 shown in FIG. 1 (a). If there is a recording end command in S30, the address of the sector where recording has been completed is converted to the corresponding block number Be (S21), and the block number Be is reported to the host device as a recording end block (S22), and all operations are performed. Ends.

Note that the physical form of the address is not limited to this embodiment, and any physical form such as a pit-like form or a form due to a phase change of a recording medium may be used. Further, although the present embodiment discloses a digital recording medium using a magnetic field modulation method, the present invention is also applicable to a rewritable recording medium using another method.
In addition, the present invention is not limited to the form of a disk, and may be a card-shaped recording medium without departing from the scope of the present invention.

〔The invention's effect〕

As described above, the information recording / reproducing apparatus according to the present invention has a buffer storage unit for temporarily saving continuous information input from the outside, and reads continuous information from the buffer storage unit to store the continuous information in the optical recording medium. Recording means for performing a recording operation on the optical recording medium, address recognizing means for recognizing an address recorded on the optical recording medium at any time, and starting writing of recording information to the buffer storage means at the time of receiving a recording start command, When the address recognized by the address recognizing means coincides with a desired address to start recording, reading of the recording information from the buffer storing means is started to cause the recording means to perform a recording operation, and a recording end instruction is issued. When the unread continuous information left on the buffer storage means at the time of reception is recorded on the optical recording medium, the continuous information is recorded by the recording means. A configuration in which a control means for stopping the recording operation.

Thereby, the recording from the desired recording start address on the optical recording medium is performed in a state where the head is not missing in response to the recording start instruction, and the continuous recording on the optical recording medium is performed in response to the recording end instruction. The recording of the target information is performed in a state where the butt is not cut off.

Therefore, according to the information recording / reproducing apparatus of the present invention,
A recording operation without a head or tail shortage corresponding to a recording start and end command of recording information can be realized, and there is an effect that recording can be performed without losing continuous information from a desired sector position.

[Brief description of the drawings]

1 to 5 show an embodiment of the present invention. FIG. 1A is a flowchart showing a control operation when recording is started from a stopped state. FIG. 1 (b) is a flowchart showing a control operation at the time of suspension and recording resumption. FIG. 2 is a block diagram of the information recording / reproducing apparatus. FIG. 3 is a timing chart of a write / read operation for the buffer memory. FIG. 4 is a schematic plan view of the magneto-optical disk. FIG. 5 is an enlarged plan view of the same. 1 is a magneto-optical disk (optical recording medium), 4 is an optical head (recording means), 5 is a coil (recording means), 11 is a prerecorded information detection circuit (address recognition means), and 12 is an address detection circuit (address recognition means). ), 13 is a system controller (control means, comparison means), 14 is a TOC memory (storage means), 25
Denotes a buffer memory (buffer storage means).

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shigeo Terashima 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (56) References JP-A-2-216673 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) G11B 20/10

Claims (1)

(57) [Claims] 1. An information recording / reproducing apparatus for recording / reproducing information on / from an optical recording medium in which addresses necessary for recording / reproducing are recorded in advance and for stopping recording is provided. Buffer storage means for temporarily saving, recording means for reading continuous information from the buffer storage means and performing a recording operation on the optical recording medium, and an address for recognizing an address recorded on the optical recording medium as needed Recognizing means, when the recording start instruction is received, writing of the recording information into the buffer storing means is started, and when the address recognized by the address recognizing means coincides with a desired address for starting the recording, the buffer storing means is started. The reading of the recording information from the recording means is started to cause the recording means to perform the recording operation. Information recording and reproducing apparatus of the continuous information of the read end left on file storage means, characterized in that a control means for stopping the recording operation by said recording means after recording onto the optical recording medium.