JPH03288363A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To preserve preceding records without fail by stopping reading and recording operations when passed time (t) is coincident with required time td after receiving a recording ending instruction. CONSTITUTION:When the recording ending instruction is received, the write of a buffer memory 25 is stopped. When a desired address As to start recording is coincident with an address Sn in a comparing means, continuous information is read out from the memory 25 and the recording operation is executed. When the time (t) passed after the reception of the recording ending instruction is coincident with the required time td in the comparing means, the reading and recording operations are stopped. Thus, when starting the recording operation from a stop state or from a temporary stop state, a problem not to record the continuous information for one track at a maximum is canceled.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention records/reproduces information on various recording media such as rewritable optical discs, and temporarily stops recording/reproducing information by using a stay jump. The present invention relates to an information recording/reproducing device having a function of

[Conventional technology]

Conventionally, continuous information such as music information (hereinafter, text information such as document files is referred to as discrete information in contrast to continuous information) is recorded as a digital signal using optically detectable minute pits. So-called compact discs (hereinafter referred to as CDs) are widely used.

This CD is played back by a playback-only optical disc playback device.

In the signal format used in CDs, the subcode included in one frame is completed by forming a subcoding block in 98 frames corresponding to one sector. The sub-coding block contains sector information as an address (recording/playback position information) on the disk,
and additional information such as a track number (called a song number when the main information is music information). Further, the frame frequency is set to 7.35 kHz, and the sector frequency is set to 1/98 of that, which is 75 Hz. Therefore, the length of one sector is 1775 seconds, or approximately 13
．． It will be 3ms. The sector position on the disk is a combination of "minutes": "seconds": "sector number within one second (i.e., any value from 0 to 74)" based on the recording start position on the innermost circumference of the disk. It is expressed as continuous time information or position information that increases sequentially from the innermost circumference of the disc.

Furthermore, information is recorded/reproduced using a block, which is made up of several sectors, as a minimum unit.

Due to the above format, when a CD player loads a disc, the TOC (
The additional information in the Table of Contents) area is read out, the number of each piece of main information (corresponding to the number of songs in the case of music information), etc. is recognized, and the recording start position is recognized based on the sector position information. . To access the desired track for subsequent playback instructions, use TOCf.
This is quickly executed by comparing the information on the il area and the sector position information provided by the sub-coding block.

In addition, the disk rotation control of a CD player is controlled by a CL so that the speed relative to the optical pickup is always constant.
V (Constant Linear Velocity)
ty) control is performed.

On the other hand, when recording/reproducing various types of information such as music information or computer information on rewritable optical disks such as magneto-optical disks, which have been developed in recent years, the reproduction method of the information recording/reproducing device is conventional CD or CD. -ROM
(Compact Disk Read Only M
It is desirable to have commonality and compatibility with ``emory''. In this case, for initial discs on which no information has been recorded, there is no position information using subcodes according to the CD signal format, or frame synchronization signals used for CLV control, so there is no information available before recording. It is not possible to access any sector position, and it is also impossible to perform CLV control, etc. required during recording and reproduction.

Therefore, instead of giving the address on the disk by the subcode, a method is used in which the address is formed on the disk in some physical form. For example, sector position information can be stored in biphase marks (Biφ).
) After modulation, depending on whether each bit is "0" or "l", the guide groove of the optical disk is shifted inward or outward in the disk radial direction, or the width of the guide groove is changed to obtain sector position information. A method for obtaining the following has been proposed (see Japanese Unexamined Patent Publication No. 39632/1983).

In that case, the frequency band of the shape change of the guide groove due to biphase mark modulation and E F M (Eight t.

(Fourteen Modulation) If the frequency bands of the recorded information subjected to modulation are made different, it is possible to reproduce both information separately from each other. This makes it possible to access an area where there is no subcode information using an address physically recorded by the deviation of the guide groove or the like. Also, regarding CLV control, accurate speed control is possible by using reproduced carrier components such as deviation of the guide groove, and this CLV control can be performed even during recording.

The rewritable optical disc, which is compatible with CDs as mentioned above, is a format that can efficiently record a wide variety of information such as text information in addition to music information on a single disc, especially as an information recording medium for home use. It is desirable to do so.

By the way, in an information recording/reproducing apparatus having a function of temporarily stopping recording/reproducing, -time stopping is generally executed by a method called a stay jump. This method is equipped with a means for detecting one pulse per rotation of the spindle motor that rotates the disk, and when the information recording/reproducing apparatus receives a pause command, the tracking is performed at the point when the above pulse is detected. The recording means that is currently being recorded is caused to jump one track to the inner circumference side. Further, even while searching for a desired block to start recording and waiting for a recording start instruction, a stay jump is performed on a track including the desired block and the device waits. The recording/reproducing operation starts when the information recording/reproducing device receives a recording/reproducing start command.

In such an information recording/reproducing device, although the position (sector position) on the track where the recording means stall jumps during the -time stop operation is fixed, the position cannot be reached until a pulse is detected after a pause command is issued. By the time the disc is updated, the discrepancy of one track at most has occurred. Further, new recording after the - time stop is started from an unspecified sector position on the preceding track for one round where the stay jump is performed.

In this way, the recording restart position has an error of ±1 track from the point at which the pause command is issued. Therefore, if you start recording immediately after receiving the recording start command, -
If an error by one track occurs, the preceding recording is overwritten and lost; if an error by +1 track occurs, unnecessary preceding recording remains.

Therefore, in order to start recording from a desired sector position, the address of the sector where recording starts is memorized.
An information recording/reproducing apparatus has been proposed in which a stay jump is performed when the above address is recognized, and a recording operation is started when the above address is recognized.

[Problem to be solved by the invention]

However, in the above-mentioned information recording and reproducing apparatus, when a recording start command is issued, it takes time for the recording means to access the address of the desired sector position before starting recording, so that continuous information cannot be recorded during that time. . For example, if a recording start command is issued immediately after a standby stale jump is performed, continuous information for one revolution of the trunk will not be recorded. Taking the CLV control method of a CD player as an example, the disc rotation speed when the recording means tracks the inner circumferential side is approximately 50 Orpm, so the rotation speed is 1 per rotation.
It takes 20ms. Continuous information for one round of a track that is not recorded, that is, when converted into the number of sectors, is l as described above.
Since it is 13.3 ms per sector, it corresponds to about 9 sectors. On the other hand, since the disk rotation speed when the recording means tracks the outer circumferential side is about 20 rpm, one rotation requires 300 m5, and continuous information for one round of unrecorded tracks corresponds to a little less than 23 sectors.

In this way, continuous information immediately after the start of recording is not recorded for a short time, resulting in so-called truncated recording, which creates a sense of discontinuity in the auditory sense when continuous playback is performed. have.

An object of the present invention is to provide an information recording and reproducing apparatus that can record continuous information from a desired sector position without missing it.

[Means to solve the problem]

In order to solve the above problems, an information recording and reproducing apparatus according to the present invention provides a record in which addresses necessary for recording and reproducing are pre-recorded by a deviation of a guide groove corresponding to a physical form change, for example, high phase mark modulation. In an information recording and reproducing apparatus having a function of recording and reproducing information on a medium and temporarily stopping the recording and reproducing by a stay jump of the recording means, an address recognition means for recognizing an address Sn at any time, for example, detecting pre-recorded information. A circuit and an address detection circuit, a timer for measuring a predetermined elapsed time from the time when a recording start command and a recording end command are received, and a desired address A at which recording is to be started.
s and a storage means, for example, TO, for storing the time td required for the address recognition means to recognize the address As from the time when the recording start command is received, which is timed by the timer means.
The address As is read from the C memory and the storage means and compared with the address Sn, and the required time t is read from the storage means.
Comparison means for reading d and comparing it with the elapsed time t; a buffer storage means for temporarily saving continuous information inputted from the outside; and a buffer storage means for temporarily saving continuous information inputted from the outside; Start writing continuous information, stop the above writing when a recording end command is received, and read continuous information from the buffer storage means and record it in the recording means when the address Sn matches the address As in the comparison means. A control means, for example, a system controller, is provided to cause the reading and recording operations to be performed and to stop the above reading and recording operations when the elapsed time t from the time when the recording end command is received in the comparison means matches the required time td. It is a feature.

[For production]

According to the above configuration, when the information recording and reproducing apparatus receives an instruction to start recording continuous information such as music information, the control means temporarily saves the continuous information in the buffer storage means. at the same time,
The timing means begins to count the elapsed time. The comparison means reads the desired address As for starting recording from the storage means, and compares it with the address Sn recognized by the address recognition means at any time.

The control means reads continuous information from the buffer storage means and causes the recording means to perform a recording operation when As=Sn in the comparison means. The timer measures the time td required from the time when the recording start command is received until As=Sn in the comparison means, and the storage means stores the required time td.

Further, at the time when the control means receives the recording end command, the control means stops writing continuous information to the buffer storage means, and at the same time, the time measurement means starts counting the elapsed time. The control means stops reading continuous information from the buffer storage means and stops the recording operation when the elapsed time t in the comparison means matches the required time td read from the storage means.

Further, when the control means receives a recording-time stop command during a recording operation, it stops writing continuous information to the buffer storage means at that point, and at the same time, the time measuring means starts counting the elapsed time. The control means stops reading continuous information from the buffer storage means and interrupts the recording operation when the elapsed time t matches the required time td read from the storage means in the comparison means. The storage means stores the address As recognized by the address recognition means at the time when recording is interrupted. Then, the comparing means reads out the above-mentioned address As for restarting recording and reproduction from the storage means, and compares it with the address Sn recognized by the address recognition means at any time.When As=Sn in the comparing means, the control means 1
Stall jump is performed to the inner circumference side by a track amount, and the process is repeated until a recording restart command is received. The processing performed after the control means receives the recording restart command is the same as the processing performed after receiving the recording start command described above.

As a result, continuous information can be recorded without omission after receiving a recording start command from a desired address. Further, even when restarting after recording is interrupted, since recording is restarted from the address at the time of recording interruption, there is no possibility that the preceding recording for one track is lost or remains unnecessarily.

〔Example〕

An embodiment of the present invention will be described below based on FIGS. 1 to 5.

As shown in FIG. 4, the magneto-optical disk 1 as a rewritable recording medium is provided with an information recording area 1b and a TOC6B area 1a on the inner circumferential side thereof. In the information recording area 1b, various types of information such as music information, characters, images, code data, etc. are recorded in blocks, which are made up of a collection of several sectors, as the minimum unit. In the TOC area 1a, additional information regarding each piece of information recorded in the information recording area 1b, such as a start block position and an end block position for each piece of information, is recorded.

As shown in FIG. 5, spiral guide grooves 2 (shown by hatching for convenience) are formed in advance at predetermined intervals in the disk radial direction in the TOC area 1a and the information recording area 1b. ing. And the recording on the disk/
The address as playback position information is determined by moving the guide groove 2 . The above address recorded by biasing is also used as rotation control information when performing CLV control and the like. Note that one of the addresses in this embodiment corresponds to one of the sectors in the compact disc recording format.

FIG. 2 shows a block diagram of an information recording/reproducing apparatus for recording/reproducing information on the magneto-optical disk 1 as described above. The information recording and reproducing apparatus includes a spindle motor 3 that rotationally drives the magneto-optical disk 1 under CLV control, and an optical head 4 as a recording/reproducing means that irradiates the magneto-optical disk 1 with laser light during recording and reproduction. , and a coil 5 as a 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. In addition, when starting recording from a stopped state or when recording/playback is paused, the optical head 4 remains at a predetermined sector position until an instruction to start recording/playback is received, as will be described in detail later. It is configured to perform a so-called stay jump, in which it repeatedly jumps to the inner circumference side by a track distance and returns.

The information recording/reproducing apparatus of this embodiment is configured to perform recording using a so-called magnetic field modulation method, and is capable of overriding by recording new information on top of already recorded information. The information recording/reproducing device further includes a terminal 6 connected to a higher-level device such as a so-called personal computer, and can receive instructions such as recording, playback, or pause from the higher-level device via the terminal 6, and can exchange text and text with the higher-level device. Exchanging digital signals such as image information. Continuous information to be recorded, such as analog signals such as music information, is input manually from an external audio device or the like via the input terminal 22.

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

Signal processing in the recording signal processing circuit 7 is as follows. That is, after the parity for error detection and correction is generated and added to the digital data h, and the subcode information generated by the subcode generation circuit 17 is added, the E
F M (Eight to Fourteen Mod
ulation), and a frame synchronization signal is added to generate a recording signal. This recording signal is supplied to the coil driver 8. Information is recorded by the coil driver 8 driving the coil 5 based on the supplied recording signal, and at the same time, the optical head 4 irradiating the magneto-optical disk 1 with a recording output laser beam.

Note that the signal format here can be, for example, similar to 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 supplied to the switching circuit 19 via the terminal 6 and the interface 18 as digital data f. The switching circuit 19 receives digital data f.
For example, additional data e from the sector data generation circuit 20 is added to each block as a unit, and the data is supplied to the recording signal processing circuit 7 as digital data h. Hereinafter, the recording signal generation process is performed in the same procedure as above.

Further, the signal reproduced by the optical head 4 is amplified by the reproduction amplifier IO and sent to the pre-recorded information detection circuit 11 and the reproduction signal processing circuit 15. The prerecorded information detection circuit 11 (address recognition means) includes, for example, a band pass filter and a P
The bottom of the tank is formed by L L (Phase Locked Loop). The bandpass filter is, for example, 22kHz.
A reproduced signal of the deviation of the guide groove (corresponding to a biphase mark modulation signal) having a frequency band around z is extracted and outputted 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 it to the CLV control circuit 9.

In the CLV control circuit 9, P of the prerecorded information detection circuit 11
The synchronous clock supplied from the LL is compared with an internally held reference frequency, and the rotation of the spindle motor 3 is controlled using the difference signal. This achieves accurate CLV control.

The address detection circuit 12 is separated from, for example, a biphase mark demodulation circuit and an address decoder. The bi-phase mark demodulation circuit demodulates the reproduced signal of the deviation of the guide groove to the high-phase mark, and the address decoder converts the bi-phase mark demodulated data into position information on the disk,
That is, it is decoded into an address and supplied to the system controller 13 as control means and comparison means.

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, it is output as analog music information or the like to an external audio device or the like via the D/A (digital/analog) converter 23 and the output terminal 24.

The subcode information EFM demodulated by the reproduced signal processing circuit 15 is supplied to the subcode detection circuit 16, and the subcode information recognized by the subcode detection circuit 16 is supplied to the system controller 13. System controller 13
receives commands such as recording, playback, and stop at - time from the host device via the terminal 6 and interface 18. 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 instructs a moving mechanism (not shown) for the optical head 4 and the coil 5. It has an access function to move the optical head 4 and coil 5 to predetermined positions.

Further, the system controller 13 selects the subcode information supplied from the subcode detection circuit 16 and stores it in the TOC memory 14 as a storage means, or selects the subcode information supplied from the subcode detection circuit 16, or selects the TOC information provided from the host device via the interface 18. It is possible to store information related to the TOC memory 14 in the TOC memory 14, and to read out the contents of the TOC memory 14 at any time.

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

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

As shown in FIG. 1(a), in step (hereinafter referred to as S) O, the system controller 13 receives a seek instruction from the host device prior to recording, and when the block number at which recording is scheduled to be started is specified. , converts the seek block number into a corresponding address As, and stores it in the TOC memory 14. Next, the system controller 13 moves the optical head 4 and the coil 5 while seeking (searching) for the position of the address As (Sl), and when the address As is detected, the optical head 4 and the coil 5 are moved one track to the circumferential side. Jump (S2). Thereafter, the address Sn is continuously supplied from the address detection circuit 12 (S3), and when it is compared with the address As and becomes equal (S4), that is, the address A
Every time s is detected, return to S2 and perform a stay jump (1
71 rotations) is executed and enters a standby state. Stale jump is repeated until a command to start recording is given.

When a recording start command is received in S5, the block number designated by the host device for recording start/end is converted into the corresponding address A s / A e and stored in the TOC memory 14 (S6). At the same time, music information input from an external audio device etc. via the input terminal 22 is input to the A/
The data is written into the buffer memory 25 via the D converter 21 (S7), and at the same time, the timer is reset and starts counting (S8). Furthermore, the system controller 13 recognizes the address Sn that is continuously supplied (S9), compares it with the address As, and when they are equal (S10), transfers the music information temporarily saved from the buffer memory 25 using the FIFO method. Start reading (Sll). At this time, the timer is stopped, and the time td required after receiving the recording start command is stored in the TOC memory 14 (S12
).

The optical hand 4 and the coil 5 start the recording operation from the block starting with the address As (313).If there is no command to pause recording in S14, the system controller 13
recognizes the continuously supplied address Sn (515)
, and when they are equal to the address Ae of the scheduled recording end block (516), the writing of music information to the buffer memory 25 is stopped (317). Then, when the time measured by the reset timer becomes equal to the required time td read from the TOC memory 14 (318), the recording operation ends (319). At the same time, reading from the buffer memory 25 is also stopped (520).

The time lapse of writing and reading music information in the buffer memory 25 will be explained in detail based on the timing chart of FIG. It begins. At the time when the address Sn, which is recognized at any time, becomes equal to the address As, reading from the buffer memory 25 is started and the recording operation is executed (required time td=t+to). Address S that is recognized at any time
At time t2 when n becomes equal to address Ae, writing to the buffer memory 25 is stopped. The recording operation continues until the required time td elapses from time t2 while music information is read from the buffer memory 25. When time td elapses from time t2 to time t3, reading from the buffer memory 25 is stopped and the recording operation is also completed.

Next, if there is an instruction to pause recording in S14, the first
As shown in Figure (b), the system controller 13 stops writing music information to the buffer memory 25 (
S21). Then, the time point when the time measured by the reset timer becomes equal to the previously obtained required time td (S22)
The recording operation is interrupted (S23). At the same time, reading from the buffer memory 25 is also stopped (S24).
. At this time, the system controller 13 stores the address As supplied from the address detection circuit 12 at the time when recording is interrupted in the TOC memory 14 (S25), and also instructs the moving mechanism to make the optical head 4 stale jump. (S26). Even after the optical hand 4 jumps to the inner circumference side by one track, the system controller 13 recognizes the address Sn at any time (S27), and at the same time reads out the address As stored in the TOC memory 14 at any time, and uses the above address Sn and the address As at any time. A comparison is made (32B). 5n=As
When this happens, the process returns to S26 and a stay jump is executed. The stay jump movement from 326 to S28 is as follows:
The process is repeated until an instruction to resume recording is issued from the host device in S29, or until an instruction to end recording is issued from the host device in S30. If there is an instruction to resume recording in S29, the process returns to the aforementioned S7 shown in FIG. 1(a). Also, if there is a recording end command in S30, the address of the sector where recording has ended is converted to the corresponding block number Be (531), the block number Be is reported to the host device as the recording end block (S32), and all operations are completed. finish.

Note that the physical form of the address is not limited to this embodiment, and may be any form as long as it is recognizable, such as a pit-like form or a form due to a phase change of the recording medium. Furthermore, although this embodiment discloses a disk-shaped recording medium using a magnetic field modulation method, it is also applicable to rewritable recording media using other methods. Even if it is a medium, it can be implemented without departing from the spirit of the present invention.

〔Effect of the invention〕

As described above, the information recording and reproducing apparatus according to the present invention includes: an address recognition unit that recognizes the address Sn at any time; a clock unit that measures a predetermined elapsed time from the time when a recording start command and a recording end command are received; a storage means for storing a desired address As for starting recording and the required time td from the time when the recording start command is received, which is timed by the clock means, until the address recognition means recognizes the address As;
Comparison means reads address As from storage means and compares it with address Sn, reads required time td from storage means and compares it with elapsed time t, and buffer storage means temporarily saves continuous information input from the outside. and,
Continuous information is started to be written into the buffer storage means when a recording start command is received, and the above writing is stopped when a recording end command is received, and the comparing means writes the address Sn.
Continuous information is read from the buffer storage means and the recording means is caused to perform a recording operation at the time when matches the address As, and when the elapsed time t from the time when the comparison means receives the recording end command matches the required time td. This configuration includes a control means for stopping the reading and recording operations described above.

With this, when starting recording operation from a stopped state,
Or, when starting the recording operation from the - time stop state,
This solves the problem that continuous information for a maximum of one track is not recorded. Therefore, not only the preceding recording is reliably saved, but also immediate recording without so-called missing parts is possible, and there is an effect that there is no audible discontinuity caused by continuous playback.

[Brief explanation of the drawing]

1 to 5 show one embodiment of the present invention. FIG. 1(a) is a flowchart showing the control operation when starting recording from a stopped state. FIG. 1(b) is a flowchart showing control operations when recording is stopped and when recording is resumed. FIG. 2 shows the countries that constitute the block of information recording and reproducing equipment. FIG. 3 is a timing chart of write/read operations 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 (recording medium), 4 is an optical head (recording means), 5 is a coil (recording means), 11 is a pre-recorded information detection circuit (address recognition means), 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), and 25 is a buffer memory (buffer storage means).

Claims (1)

[Claims] 1. It has the function of recording and reproducing information on a recording medium in which the addresses necessary for recording and reproducing are pre-recorded by changing the physical form, and also temporarily stopping the recording and reproducing by still jumping the recording means. An information recording and reproducing apparatus includes an address recognition means for recognizing an address Sn at any time, a timekeeping means for counting a predetermined elapsed time from the time when a recording start command and a recording end command are received, and a desired address As for starting recording. and a storage means for storing the required time td measured by the clock means from the time when the recording start command is received until the address recognition means recognizes the address As, and a storage means for reading the address As from the storage means. In addition to comparing with address Sn,
a comparison means for reading the required time td from the storage means and comparing it with the elapsed time t; a buffer storage means for temporarily saving continuous information input from the outside; and a buffer storage means for temporarily saving continuous information input from the outside; The above information is started to be written, and when the recording end command is received, the above writing is stopped.
Further, when the address Sn matches the address As in the comparison means, continuous information is read from the buffer storage means and the recording means is caused to perform a recording operation, and the elapsed time t from the time when the comparison means receives a recording end command is required. time t
An information recording/reproducing apparatus comprising: a control means for stopping the reading and recording operations described above when the time point coincides with d.