JPH04177670A - Information recorder - Google Patents

Abstract

PURPOSE:To start recording even when a linear speed does not reach a predetermined value and to shorten an access time by generating a recording clock to be used to process a signal at the time of recording based on previous recording information on a recording medium. CONSTITUTION:If information to be recorded is discrete information, information (j) from an interface 16 is output to a first switching circuit 14. When an optical head 3 reaches a predetermined record starting absolute address position after designation of a record is received, a recording clock (e) synchronized with previous recording information on a disk generated by a first recording clock generation circuit 6 is supplied to a signal processing circuit 13 through a second switching circuit 17. Thus, even if it does not reach a predetermined linear speed, it can be sequentially recorded at substantially the same absolute address position as that when the information to be recorded is recorded at a predetermined linear speed. Accordingly, the access time can be shortened.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an information recording device that records various information such as music information or computer data while rotating a recording medium at a constant linear velocity. .

[Conventional technology]

Conventionally, so-called compact discs (hereinafter referred to as CDs), on which continuous information such as music information is recorded as digital signals using optically detectable pit sequences, have been widely used.

In addition, focusing on the large recording capacity of CDs and the good productivity achieved by using resin for the substrate, we developed CD-ROMs (Compact Discs) that record discrete information such as computer data in addition to music information. Re
ad 0nly memory is starting to become popular. These CDs and CD-ROMs are played back by a playback-only optical disc playback device (a CD player or a W device equipped with a CD-ROM drive).

8 and 9 are schematic diagrams illustrating the signal format used in CDs or CD-ROMs.

As shown in FIG. 8, one frame 50a of the recording signal is
It is composed of a frame synchronization signal 50b indicating the beginning of the frame, a subcode 50c which is additional information, and a data field 50d which is 24 hide data which is main information and an 8-byte error correction parity code added. Note that the data field 50d is CI RC (Cross
Interleaved Reed Solomon
An error correction method that combines non-complete interleaving called "Code" is used.

Further, the frame 50a has 98 parts as shown in FIG.
Each subcoding frame (hereinafter referred to as a sector) 51a is composed of one subcoding frame (hereinafter referred to as a sector). The subcode 50c in each frame 50a constitutes one subcoding block 51c for 98 frames, which provides track number (called a song number when the main information is music information) and absolute address information on the disc. etc. are expressed. Note that the frame synchronization signal 51b and data field 51d in FIG. 9 are respectively the frame synchronization signal 50b in FIG.
This shows a state in which 98 frames of data fields 50d and 50d are assembled.

The length of one sector is 13.3 (ms), so 75
A sector takes 1 second. The sector number that indicates the sector number on the disk is expressed by the combination of minutes: seconds: sector number within 1 second (00 to 74). Contains continuous time information and position information that increase sequentially from the innermost circumference.

FIG. 7 is a schematic diagram showing the arrangement of areas on a CD or CD-ROM. The disc 52 has an information recording area 52b in which main information such as music information and sector numbers based on the above-mentioned subcodes are recorded, and additional information related to each main information recorded in the information recording area 52b, such as each track number and each track. TOC (TOC) in which the recording start sector number and information identifying whether audio information such as music information or computer data is recorded on the track are indicated by subcodes.
Table of Contents) eN area 52a
It is composed of.

With the above formant, the CD player reads the subcode information in the TOCM area 52a when loading the disc, thereby determining the number of main information (corresponding to the number of songs in the case of music information) and the sector number of the recording start position. and the type of information (audio information or computer data). Then, for subsequent playback instructions,
Reproduction of a desired track is quickly performed with an access operation by comparing the sector number with the information in the TOC area 52a and the subcode in the information recording area 52b.

When recording these CDs or CD-ROMs, so-called C
LV (Constant Linear Vel
Since the rotation is controlled using the occupancy method, the recording density is constant at any position on the disk, which is suitable for improving the recording capacity. Actual CD player or CD-
In the ROM drive, C
CLVwI control is performed by controlling the rotation of the disc so that the interval between playback signals, such as frame synchronization signals, of a CD or CD-ROM recorded with LV becomes a reference length.

By the way, when recording and reproducing various information such as music information and computer data on rewritable disks such as magneto-optical disks, which have been developed in recent years, it is difficult to record and reproduce various information such as music information and computer data. It is desirable to standardize the system and provide compatible information recording and reproducing devices.

In this case, for initial discs on which no particular information is recorded, absolute address information and CL information using subcodes according to the signal format of CD or CD-ROM are used.
Since there is no frame synchronization signal used for V control, it becomes impossible to address an arbitrary sector position prior to recording, and CLV control during recording cannot be performed.

Therefore, as an absolute address recording method equivalent to the absolute address information using the subcode, after bi-phase mark modulation of the absolute address is performed, the optical disc is Displace the guide groove to the outside or inside of the magneto-optical disk in the radial direction.1
, or one in which the width of the guide groove is changed has been proposed (see Japanese Unexamined Patent Publication No. 39632/1983).

At that time, the frequency band of the absolute address recorded by high phase mark modulation and E F M (Eightt
o Fourteen Modulation) If the frequency bands of the recorded information by modulation are made different, it is possible to reproduce both information separately from each other. Therefore,
It is possible to access an area without recorded information using the above absolute address.

Furthermore, using the reproduced carrier component at the above absolute address,
By comparing this reproduced carrier component with a reference clock generated within the device, accurate CLV control is possible. This CLV control can be performed even during recording. Furthermore, when recording information, a recording signal can be generated by encoding/modulating the recording information using the reference clock.

These rewritable disks, which are compatible with CDs or CD-ROMs, take advantage of the fact that they can be accessed at high speed, unlike magnetic tapes, etc., and are particularly useful as home information recording media for music information. In addition, it is desirable to have a format that allows efficient and quick recording of a wide variety of data such as computer data.

[Problem to be Solved by the Invention] By the way, when attempting to record information using the above-mentioned CD or CD-ROM signal format, the information is recorded at a desired absolute address position on the disc before recording the information. An access operation is required in which the optical head is moved and the rotational speed of the disk is controlled to a predetermined linear speed.

In that case, in general, the time required to maintain the linear velocity at a constant value after moving to a predetermined address upon access is:
This is longer than the time required to move the optical head to a predetermined address. In particular, when moving from the innermost circumference to the outermost circumference of the disk, or vice versa, the rotational speed ratio becomes 2=1 or more, and the access time increases.

FIG. 6 shows the relationship between various operations up to the start of recording in an information recording/reproducing apparatus using the above-mentioned rewritable disk and the disk rotation speed. Further, FIG. 10 is a flowchart showing the operating procedure up to the start of recording.

In both of these figures, when recording is instructed by the host device or the user (So), the optical head is moved to the specified recording start absolute address position on the disk (
SL). Then, it is confirmed whether the target absolute address position has been reached (S2). Here, the rotational speed of the disk is maintained at almost the same value for a period of m2 from when it starts moving at time tl until it reaches the target absolute address position at time t2.

When the target absolute address position is reached, a stay jump (a jump that returns the optical beam by one track each time the disk rotates) is performed to keep the optical head almost stationary at that disk radial position and put it into a standby state. S3)
, starts CLV control (S4).

Then, it is determined whether the linear velocity has reached a predetermined value (S5
). After the period m3 has elapsed, when the linear velocity reaches a predetermined value at time L3, it is then determined whether the target absolute address position has been reached within the trunk that is being repeatedly reproduced by the stay jump operation (S6).

After the period m4 has elapsed, if the target absolute address is reached at time t4, the stay jump operation is turned off (37).
, starts recording (S8).

As is clear from the above explanation, the so-called CAV (Co
Compared to hard disks or floppy disks that record using the Instant Angular Velocity method, the CLV method requires a waiting time to control the linear velocity of the disk in addition to the time required for the head to move in the radial direction and the rotational waiting time. become.

This does not pose much of a problem when the information to be recorded is continuous and large-capacity, such as music information. However, discrete data such as computer data,
Particularly in the case of information that has a small capacity and is frequently recorded and rewritten, a waiting time due to the above-mentioned linear velocity control occurs each time it is recorded, which is inconvenient.

Note that even if the drive capacity for moving the optical head in the radial direction is improved for the purpose of increasing access speed, the waiting time for linear velocity control mentioned above and the subsequent rotation until reaching the target absolute address will be Since the waiting time is not reduced, an increase in the access time cannot be avoided.

[Means to solve the problem]

In order to solve the above problems, an information recording device according to the present invention uses a recording medium on which prerecorded information including rotation control information for controlling rotation at a constant linear velocity is formed. The present invention is characterized in that it includes a first recording clock generating means for generating a recording clock used for signal processing at a time based on pre-recorded information on the recording medium (claim 1).

Another information recording apparatus of the present invention includes, in addition to the above configuration, a second recording clock generation means for generating a recording clock at a predetermined reference frequency, and a first recording clock generation means when the recording information is discrete information. On the other hand, when the recorded information is continuous information, the above-mentioned second method is selected.
The present invention is characterized by comprising a recording clock selection means for selecting a recording clock generated by the recording clock generation means (claim 2).

(Function) According to the structure of claim 1 above, if the information to be recorded is discrete information such as computer data, the recording clock used for processing the recording signal is synchronized with the pre-recorded information on the disk. Since the recording clock is generated by the first recording clock generation means based on the access operation, as long as the recording head reaches a predetermined absolute address by the access operation, recording can start even if the linear velocity has not reached the predetermined value. It becomes possible to start.

That is, if the linear velocity when the head reaches a predetermined absolute address is smaller than the predetermined value, the frequency of the recording clock generated by the first recording clock generation means will be lower than the standard frequency; on the other hand, if the linear velocity is larger than the predetermined value, , the frequency of the recording clock generated by the first recording clock generation means is higher than the standard frequency, but since the frequency of the recording clock generated by the first recording clock generation means is proportional to the linear velocity, the information to be recorded is approximately located at a predetermined address position. In other words, recording is performed at a constant recording density at approximately the same address position as when recording is performed at a predetermined linear velocity. In this way, by starting recording before reaching a predetermined linear velocity,
Access time can be reduced.

Further, according to the structure of claim 2, if the information to be recorded is discrete information, the recording clock is generated based on the rotation control information on the disk in the same manner as described above, while the information to be recorded is If the information is continuous information such as music information, the second recording clock generation means is selected by the recording clock selection means and a recording clock is generated at the reference frequency.

Therefore, if the information to be recorded is continuous information, it can be recorded using a recording signal that is synchronized with an external input signal and has no time axis fluctuations, as in the conventional case. Note that if the information to be recorded is discrete information such as computer data, there is no problem even if some time axis fluctuation occurs, but since it is particularly undesirable for music information etc. to have time axis fluctuation, the above As shown in the figure, the standard Kurofuku is used.

[Embodiment] An embodiment of the present invention will be described below based on FIGS. 1 to 6.

As shown in FIG. 3, a magneto-optical disk 1 as a rewritable recording medium has TOCTiN at its inner edge.
An area 1a is provided, and most of the area outside the TOC area 1a is an information recording area 1b. In addition to music information, various information such as characters, images, and code data are recorded in the information recording area 1b, while in the TOC area 1a, additional information regarding each piece of information recorded in the information recording area 1b, for example, Recording start absolute address position for each piece of information (
Sector number), recording end absolute address position, and information identifying whether each piece of information is continuous information such as music information or discrete information such as computer data are recorded. .

As shown in FIG. 4, T O in the magneto-optical disk 1
In the C area 1a and the information recording area 1b, spiral guide grooves 2, 2, . . . (indicated by hatching for convenience) are formed in advance at predetermined intervals in the disk radial direction. Then, the absolute address on the disk is determined by bi-phase mark modulation, and guide grooves 2, 2, etc. are determined depending on whether each focus is "1" or "0". By displacing the disc in the radial direction, it is recorded as pre-recorded information.

The above absolute address represents the position on the disk and serves as rotation control information for CLV control. Also, the absolute address here is 1 in the CD format.
It corresponds to the sector.

As shown in FIG. 1, the information recording and reproducing apparatus includes a spindle motor 9 that supports and rotates the magneto-optical disk 1, an optical head 3 that irradiates the magneto-optical disk 1 with a laser beam during recording or reproduction, and an optical head 3 that irradiates the magneto-optical disk 1 with laser light during recording or reproduction. A coil 4 for applying a magnetic field to the magneto-optical disk l is provided.

This information recording/reproducing apparatus is configured to perform recording using a so-called magnetic field modulation method. A so-called override method is adopted, which is a method of recording new information over recorded information. This information recording and reproducing device receives instructions for recording etc. from a higher-level device, and
It is provided with a terminal 18 for manually inputting data such as image information, and an input terminal 19 for inputting analog information such as music information to be recorded from the outside.

For example, when recording music information, analog information input from the input terminal 19 is converted into a digital signal by an A/D (analog/digital) converter 15, and then sent to the first switching circuit 14 as data j. The signal is supplied as data to the recording signal processing circuit 13 via the recording signal processing circuit 13.

The recording signal processing circuit 13 generates and adds parity for error detection and correction and adds subcode information to the digital data k from the first switching circuit 14, and adds E F M (I
Eight to Fourteen Modulat
ion) After performing modulation, a frame synchronization signal is added and supplied to the coil driver I2.

At this time, a recording clock h (recording signal generation lock) used for recording signal generation processing is supplied by a second switching circuit 17, which will be described later.

The coil driver 12 drives the coil 4 based on the supplied signal, and at the same time records the signal by irradiating the magneto-optical disk 1 with a recording laser beam from the optical head 3.

Note that the signal format here may be the same as that shown in FIG. 8 and FIG. 9, so a description thereof will be omitted.

On the other hand, when recording discrete information such as character information, information input from the terminal 18 is supplied as data j to the first switching circuit 14 via the interface 16, and
Recording signal processing circuit 13 as data from switching circuit 14
is supplied to Thereafter, recording is performed in the same manner as above.

On the other hand, the signal reproduced by the optical head 3 (including during recording) is amplified by the reproduction amplifier 5, and the first signal is reproduced as the reproduction signal a.
Recording clock generation circuit 6 (first recording clock generation means)
sent to. The reproduced signal a includes an error signal of the optical beam servo (focus and tracking servo),
Of these, the prerecorded information, which is biphase mark modulated absolute address information (also used as rotation control information), is obtained from the error signal of the tracking servo.

The first recording clock generation circuit 6 generates P L L (Phase Lock) for the pre-recorded information in the reproduced signal a.
edLoop) to generate a synchronized clock. Then, a clock d synchronized with prerecorded information consisting of an absolute address biphase mark modulation signal is supplied to the CLV control circuit 8. Also, 2
The digitized pre-recorded information and a clock C equal to the clock d are supplied to the address detection circuit 10.

Further, the recording clock e is generated as a clock synchronized with the reproduction signal a which is pre-recorded information, and the second switching circuit 1
7 (recording clock selection means).

The CLV control circuit 8 receives the clock d from the first recording clock generation circuit 6 and the second recording clock generation circuit 7 (
Accurate CLV control is achieved by comparing the clock signal g with the reference clock g from the second recording clock generating means (second recording clock generating means) and controlling the spindle motor 9 using the difference signal.

The address detection circuit 10 consists of a bi-phase mark demodulator and an address decoder, and after performing bi-phase mark demodulation of the pre-recorded information extracted by the first recording clock generation circuit 6 using the clock C, the address decoder The information is decoded into position information on the disk, that is, an absolute address value indicating a sector number, and then supplied to the controller 11.

On the other hand, the second recording clock generation circuit 7 generates a recording clock f at the reference frequency and supplies it to the second switching circuit 17, and also generates a reference clock g necessary for rotation control in synchronization with the recording clock f. The signal is configured to be supplied to the CLV control circuit 8.

The controller 11 receives recording instructions from a host device via a terminal 18 and an interface 16. Further, the position of the optical head 3 on the disk is recognized by receiving absolute address information from the address detection circuit 10, and the optical head 3 and coil 4 are moved using a moving mechanism (not shown) for the optical head 3 and coil 4. It has an access function to move it to a desired position.

FIG. 2 is a block diagram for explaining the clock generation/selection section in FIG. 1 in more detail.

The first recording clock generation circuit 6 generates B P F (BandPa
Only the pre-recorded information component is extracted by the ss Filter 61 and binarized by the comparator 62. After that, the binary pre-recorded information Suga address detection circuit 1
0 and the phase comparator 63, L P F
(Lotn Pa5s Filter) 64, VC
O(Voltage Controlled 0sci)
65 and a first frequency divider 66. The recording clock e generated by the VCO 65 is supplied to the second switching circuit 17. Further, the recording clock e is frequency-divided by a first frequency divider 66, and a comparator 62
A clock C having a frequency to be phase-compared is generated from the binarized pre-recorded information, and is supplied to the address detection circuit 10, and is also supplied to the CLVljJ control circuit 8 as the clock d.

The phase comparator 63 compares the phases of the binarized pre-recorded information and the clock C, and generates an error signal.

This error signal is smoothed by the LPF 64 and supplied as a control voltage to C065. Therefore, when the PLL is locked, both the recording signal generation clock e and the clock cd become synchronous clocks that follow the binarized pre-recorded information.

On the other hand, the second switching circuit 17 connects the reference oscillator 71 and the second
It is composed of a frequency divider 72. Then, a recording clock f having a reference frequency equal to the recording clock e in a predetermined linear velocity state is generated by a reference oscillator 71, and this recording signal generation clock f is divided by a second frequency divider 72 to control rotation. is generated as a reference clock g for
The signal is supplied to the CLV control circuit 8.

To give a specific example of the frequency of each clock, the frequencies of the recording clock e (at a predetermined linear velocity) and the recording clock r are 4,3218 (MHz), which is the channel focus frequency during EFM modulation of a CD. ) (or an integer multiple thereof), and the frequencies of clock c-d (at a given linear velocity) and clock g are 22,05 (
kHz) is selected. In this case, the frequency division ratio of the first frequency divider 66 and the second frequency divider 72 is 1/196 (or an integer fraction thereof).

Next, the actual recording operation of various information will be explained based on the flowchart of FIG.

A recording instruction from a user or a host device is given from the terminal 18 (S10), and is sent to the controller 11 via the interface 16. Depending on this, first, check whether the information instructed to be recorded is continuous information such as music information.
Alternatively, it is determined whether the information is discrete information such as computer data (S11).

If the information to be recorded is discrete information, switching is performed so that information j from the interface 16 is output as the output of the first switching circuit 14.

Furthermore, switching is performed so that the recording clock e from the first recording clock generation circuit 6 becomes the output of the second switching circuit 17 (S12).

Next, the optical head 3 and coil 4 are moved to the specified recording start absolute address position on the disk (S13
), it is determined whether the target absolute address position has been reached (314).

Then, when the target absolute address position is reached, C
LV control is turned on (315), and recording of information is immediately started (316).

In the above description, the CLV control is turned on when the recording start absolute address position is reached, but the CLV control may be turned on before the recording start absolute address position is reached.

In Sll, when the information to be recorded is continuous information such as audio information, switching is performed so that the information i from the A/D converter 15 becomes the output of the first switching circuit 14, and the second recording clock Switching is performed so that the recording clock f from the generation circuit 7 becomes the output of the second switching circuit 17 (S17).

After that, although duplicate explanation will be omitted, 31 to 31 in Fig. 10
The optical hand 3 is moved to the recording start absolute address position using the same procedure as S8, and the CLV! LJ? After reaching a predetermined linear velocity by step 11, recording is started (SL8 to SL525).

Next, the operations in steps 312 to 316 will be described in relation to FIG. 6 as follows.

When the information to be recorded is discrete information such as computer data, the period m2 from receiving a recording instruction at tl until the optical head 3 reaches a predetermined recording start absolute address position is the same as before. be. However, in this embodiment, recording of information is started immediately at time t2 when the recording start absolute address position is reached (as described above, recording was conventionally started at time t4).

Note that at time t2, the linear velocity has not yet reached the predetermined value as in the past, but the recording signal processing circuit 13 is synchronized with the pre-recorded information on the disk generated by the first recording clock generation circuit 6. The recorded recording clock e is supplied via the second switching circuit 17. Therefore, even if the predetermined linear velocity has not been reached, the information to be recorded is sequentially recorded at predetermined absolute address positions on the disk, in other words, at almost the same absolute address positions as when recording at a predetermined linear velocity. Ru.

As described above, rapid recording of discrete information such as computer data can be performed using a large capacity disk with a constant linear velocity, and continuous information such as music information can be recorded using an internal reference frequency. You can record based on the recording clock.

In the above embodiment, an information recording device was described that records a mixture of continuous information such as music information and discrete information such as computer data. The present invention can also be applied to an information recording device that records only discrete information that has been compressed. In that case, the recording clock is generated based on pre-recorded information on the disk, and the second recording clock generation circuit 7 and second switching circuit 17 in FIG. 1 are no longer necessary.

In addition, in the above embodiment, the music information is recorded as continuous information using a clock based on the reference frequency, but even if it is music information, the information supply source side records it in synchronization with the above pre-recorded information. If the device has a function of recording information following the clock e, the recording may be performed using the recording clock e.

Moreover, the form of the absolute address is as shown in FIG.
Not only the form of displacing ・2... but also other forms may be used as long as the information is recorded in advance and can be recognized.

Furthermore, in the above embodiment, a disc-shaped recording medium based on a magneto-optical method is used, but other rewritable recording media or one-time recordable media may also be used.
Further, the recording medium is not limited to a disk shape, but a card shape or the like can also be used.

[Effects of the Invention] As described above, the information recording apparatus according to the present invention includes a first recording clock generation means that generates a recording clock used for signal processing during recording based on pre-recorded information on a recording medium. The configuration is as follows.

As a result, as long as the recording head reaches a predetermined absolute address, it is possible to start recording even if the linear velocity has not reached the predetermined value, reducing access time. become able to.

Another information recording apparatus according to the present invention includes, in addition to the above configuration, a second recording clock generating means for generating a recording clock at a predetermined reference frequency, and a first recording clock when the recorded information is discrete information. The recording clock selection means selects the recording clock generated by the generation means, and selects the recording clock generated by the second recording clock generation means when the recording information is continuous information.

As a result, if the information to be recorded is discrete information, the recording clock is generated based on the rotation control information on the disk in the same way as above, but if the information to be recorded is continuous information such as music information, For example, the second recording clock generation means is selected by the recording clock selection means, and a recording clock is generated at the reference frequency. Therefore, when recording continuous information, recording can be performed using a recording signal that is synchronized with an external input signal and has no time axis fluctuations, as in the conventional case. Further, when recording discrete information, similarly to the above, recording can be started immediately upon reaching a predetermined absolute address position even if the linear velocity has not reached a predetermined value.

[Brief explanation of the drawing]

1 to 5 show one embodiment of the present invention. FIG. 1 is a block diagram showing a schematic configuration of an information recording device. FIG. 2 is a detailed block diagram of the main parts of the information recording device. FIG. 3 is a schematic plan view of the magneto-optical disk. FIG. 4 is a partially enlarged view of FIG. 3. FIG. 5 is a flowchart showing the access operation procedure. FIG. 6 explains both the present invention and the conventional example, and shows a time chart at the time of access. 7 to 10 show conventional examples. FIG. 7 is a schematic plan view of the magneto-optical disk. FIG. 8 is an explanatory diagram showing the frame structure. FIG. 9 is an explanatory diagram showing the sector configuration. FIG. 10 is a flowchart showing the access operation procedure. 1 is a magneto-optical disk (recording medium), 6 is a first recording clock generation circuit (first recording clock generation means), 7 is a second recording clock generation circuit (second recording clock generation means), 1
7 is a second switching circuit (recording clock selection means). Figure 3 Wi Ip14 Figure 6 Figure 7 Figure # 8 Figure 9

Claims (1)

[Claims] 1. In an information recording device using a recording medium on which prerecorded information including rotation control information for controlling rotation at a constant linear velocity is formed, the recording clock used for signal processing during recording is An information recording device comprising: first recording clock generation means that generates a first recording clock based on pre-recorded information on the recording medium. 2. A second recording clock generation means that generates a recording clock at a predetermined reference frequency, and when the recording information is discrete information, selects the recording clock by the first recording clock generation means, while when the recording information is continuous information. 2. The information recording apparatus according to claim 1, further comprising recording clock selection means for selecting the recording clock produced by said second recording clock generation means when said second recording clock generation means is selected.