JPH02139770A - Data recording method for optical disk - Google Patents

Abstract

PURPOSE:To surely detect the end of a recordable range in a read-in area by monitoring a regenerative signal at the time of transferring a read-in data to the read-in area and detecting a marker signal during this monitoring. CONSTITUTION:In regard to the transfer recording from a store area to a memory 22 by a transfer recording means, the read-in data recorded in the store area is compounded even in case of a large amt. of signal redundancy by a reproducing circuit 19 to be a read-in data with a small amt. of signal redundancy and then to be recorded in the memory 22. Moreover, when the marker signal is detected by a control circuit 21 during the monitoring of the transfer recording, a motor stopping signal is outputted to a motor driving circuit 23 based on this detecting signal, and the recording to a compact disk (CD) 1 is stopped as well. Thus, a regenerative signal is simultaneously monitored, and upon detection of the marker signal during this monitoring, the end of the recordable area of the read-in data can accurately be detected out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a data recording method for an optical disc.

[Background Art] In recent years, optical disks (optical disc-shaped recording media) have attracted attention as a medium that can record high-density and large-capacity information. In order to randomly access and play desired recorded data from among the large amount of recorded data recorded on such optical discs on different manufacturers' players, the recorded data and the corresponding lead-in data ( Address data) must be recorded in a compatible format. For example, in a playback-only compact disc (hereinafter simply referred to as CD) among optical digital audio discs, recorded data A, B, C, and D such as music data and these data A, B, C, and D are recorded.
Lead-in data a, b, c, and d, such as time information and number of frames, are created and recorded on a storage medium (e.g., magnetic tape) of another recording device, and then transferred to this other recording device during compatible formatting. The lead-in data a l b t CI d and the recorded data A, B, C, D read from the storage medium of are led to the original recording device, and here, as shown in FIG. The lead-in area (3) at the innermost circumference of the spiral track (2) formed in
) and a recording area (4) that is continuous to the end (3e) of this lead-in area (3).

[Problems to be Solved by the Invention] However, in the conventional data recording method as described above, data is recorded on a storage medium of another recording device and then read from the storage medium of this other recording device during compatible formatting. Lead-in data a, b.

c, d and recording data A, B, C, D were led to the original recording device and recorded in predetermined areas (3) and (4) on CD (1), so the original There was a problem in that another recording device was required in addition to the recording device.

The present invention was made in view of the above-mentioned problems.

It is an object of the present invention to provide a data recording method for an optical disc that can easily and reliably perform compatible formatting without using a separate recording device.

[Means for Solving the Problems] The method for recording data on an optical disc according to the present invention records either the spiral track formed on the optical disc from the inner periphery to the outer periphery or from the outer periphery to the inner periphery. A lead-in area, a marker area, a recording area, and a store area are provided along one side, and during recording, a marker is first recorded in the marker area to obtain a marker signal that can be distinguished from a playback signal when recording lead-in data. Then, recording data and lead-in data corresponding to this recording data are recorded in the recording area and the store area, and during compatible formatting, the lead-in data in the store area is first transferred and recorded in the memory, and then the lead-in data in this memory is The lead-in data is transferred and recorded in the lead-in area while the playback signal thereof is monitored, and the transfer recording to the lead-in area is stopped based on the detection of the marker signal during this monitoring. It is something to do.

[Action] When the record button is pressed to input record data (for example, music data) from the input circuit, a marker is first placed in the marker area to obtain a marker signal that can be distinguished from the playback signal when recording lead-in data. Then, recording data and lead-in data corresponding to this recording data are recorded in the recording area and the store area. When a compatible format signal is input from the input circuit, the lead-in data in the store area is first transferred to the memory and recorded, then the lead-in data in this memory is transferred and recorded in the lead-in area, and at the same time as the playback signal is transferred and recorded. will be monitored. If a marker signal is detected during this monitoring, it is determined that the lead-in area has ended, and transfer recording to the lead-in area is stopped. In this manner, the end of the recordable area for lead-in data can be accurately detected by detecting the marker signal.

[Embodiment] FIGS. 1 to 4 show an embodiment of the data recording method according to the present invention. FIG. 1 shows a block diagram of an apparatus for implementing the data recording method according to the present invention. In this figure, (10) is an input circuit for inputting recording data such as audio signals and signals for compatible formats from a microphone or line. The output side of this input circuit (10) is A
- It is connected to a CD format encoder (12) via a D conversion circuit (11). The CD format encoder (12) is a circuit that adds lead-in data such as time data, frame number data, and error correction data corresponding to the recorded data.The data output from this CD format encoder (12) is controlled by a changeover switch ( 13
)'s normally closed contact (14)/movable piece (15) side common terminal (1
6) and is connected to the recording input side of the recording and reproducing optical head (18) via the recording data line (17). The reproduction output side of the optical head (18) is connected to an audio signal output terminal (20) via a reproduction circuit (19).
and is coupled to the control circuit (21). A memory (22) for recording lead-in data is provided within the control circuit (21). (1
) is a CD (compact disc) of optical digital audio discs as an example of an optical disc, and this CD (1) is rotated to a predetermined rotational speed by a motor (24) driven by a drive signal from a motor drive circuit (23). controlled. (25) controls the movement of the optical head (18) in the radial direction of the CD (1), and also controls focusing, tracking, etc. of the laser beam (26) irradiated from the optical head (18) to the CD (1). It is a servo mechanism that controls the The control circuit (21) includes a CPU (
The CD format encoder (tz), the playback M (19), the motor drive circuit (23), and the servo mechanism (25) are controlled by the CD format encoder (tz). When the control circuit (21) presses a record button to input recording data (for example, music data) in the input circuit (10), an internal timer (not shown) operates, and the control circuit (21) operates for a certain period of time T4 (for example, 0.1 seconds), switches the movable piece (15) of the changeover switch (13) from the normally closed contact (14) side to the normally closed contact (27) side, and outputs a marker signal to the first signal line (Ql); This marker signal is output to the recording data line (17). The control circuit (21) is.

Further, the input circuit (10) is connected to the A-D conversion circuit (1).
1) and the second signal line Cl12).
The lead-in data recorded in the store area (29) of 1) is read out, and this lead-in data is transmitted to the playback circuit (
The memory (22) in the control circuit (21) via the
), and after the transfer recording is completed, the servo mechanism (25) is controlled to emit a laser beam (26).
) is moved inward from the vicinity of the starting end (4s) of the recording area (4) by the approximate distance required for the lead-in area (for example, 2 to 3 mm) to position the starting end (3s) of the lead-in area (3). servo control means for rotating the CD (1) in the forward direction after this positioning; and rotation control means for forward rotation of the CD (1) after this positioning; The lead-in data is transferred and recorded from the starting end (3s) to the ending end (3e), and is provided with transfer recording monitoring means for monitoring the playback signal at the time of recording this lead-in data.

In addition, in the transfer recording from the store area (29) to the memory (22) in the transfer recording means, the store area (
Even if the lead-in data recorded in 29) has a high degree of signal redundancy, it is combined by a reproducing circuit (19) to become lead-in data with low degree of signal redundancy and is then recorded in the memory (22). Furthermore, the control circuit (2
1), when a marker signal is detected during transfer record monitoring, the motor drive circuit (2) is activated based on this detection signal.
3) and outputs a motor stop signal to the CD (
1) is configured to stop recording.

Next, the operation of FIG. 1 will be explained with reference to FIGS. 2, 3, and 4.

(a) First, it is assumed that the record button is pressed in order to record Beethoven's music data A as the recording data of the first song at the 18th time. When the record button is pressed, it is read whether or not lead-in data is recorded in the lower area (29) of the CD (1), and if no lead-in data is recorded, it is determined that music data A is the first data. The movable piece (15) of the changeover switch (13) is switched from the normally closed contact (14) to the normally closed contact (27) by the switching signal from the control circuit (21), and the first signal line ( Q□), selector switch (
13) and a recording data line (17) to the optical head (18) for a certain period of time (for example, 0.1 seconds), a marker signal that can be identified as a data signal is sent, and as shown in FIG. Marker area (30) of track (2) of CD (1) is marked with a predetermined period T do 1/fm (for example, fil=4
A marker (33) in which a cut portion (31) and a non-cut portion (32) are formed is recorded at 0 KHz).

(b) After a certain period of time T1 has passed, the switching signal from the control circuit (21) disappears, and the movable piece (1) of the changeover switch (13)
5) returns to the normally closed contact (14), the music data A input from the input circuit (10) and the lead-in data a added by the CD format encoder (12) are transferred to the normally closed contact of the changeover switch (13). Laser light ( 26),
As shown in FIG. 2, the recording area (4) of the spiral track (2) of the CD (1) and the storage area (29) provided at the outermost circumference of the track (2) ) is recorded from the inner circumference to the outer circumference.

(c) Next, the second. Third. on the fourth day and month, respectively on the second
, third and fourth music data B, C, and D are additionally recorded.

C, D and the corresponding lead-in data b, c, d are
In the same manner as in (b) above, additional recording is performed in the recording area (4) and the store area (29), respectively, as shown in FIG. At this point, nothing is recorded in the lead-in area (3).

When additionally recording music data B, C, and D for the second and subsequent songs, press the record button to save the storage area (2) of CD (1).
9), since lead-in data a corresponding to music data A has already been recorded, a switching signal is not output from the control circuit (21) and the switching is not performed. Movable piece (15) of switch (13)
remains connected to the normally closed contact (14).

(d) When the recording of music data A, B, C, and D and the corresponding lead-in data a, b, c, and d on CD (1) is completed, play this CD (1) on each manufacturer's player. Compatible formats to make it possible. That is, by pressing the formatting button of the input circuit (10), the second signal line (Q2) is sent to the control circuit (21).
), when a compatible format signal is input, the transfer recording means of the control circuit (21) first
The lead-in data atbtctd recorded in the store area (29) of the CD (1) is reproduced by the optical head (18), and transferred and recorded in the memory (22) via the reproduction circuit (19).

(e) Next, the servomechanism control means of the control circuit (21) directs the laser beam (26) of the optical head (18) inward from the vicinity of the starting end (4s) of the recording area (4) by an approximate distance (for example, 2. 5mm) and move it to the lead-in area (3mm).
) position the starting end (3s).

(f) Then, by the rotation control means of the control circuit (21),
D (1) is rotated in the forward direction, and during this forward rotation, the lead-in data in the memory (22) is transferred to the starting end (3) of the lead-in area (3) by the transfer record monitoring means of the control circuit (21).
The signal is transferred and recorded from s) to the end portion (3e), and the reproduced signal is monitored.

(g) During this recording monitoring, when the laser beam (26) passes the end (3e) of the lead-in area (3) and reaches the marker area (30), the recording data signal modulated by the lead-in data or A simple recording signal without lead-in data (for example, 200 to 700 KHz)
) cuts into the marker area (30) and its reproduction signal is monitored. At this time, a pulse-like recording signal (for example, 200 KHz) as shown in FIG. Assuming that a cut is made in the area, the reproduced signal will be as shown in FIG. 4(e).

In other words, when the recording signal is H (when the laser power is at a high recording level), the first spot (Sl) of the incision has not yet progressed (membrane non-destructive state), so the level of the reproduced signal becomes high. , the middle and end spots (52) (Sl) are sufficiently incised (membrane destruction state), so the level of the reproduced signal becomes low;
Furthermore, when the recording signal is L (when the laser power is at a low reproduction level), the level of the reproduction signal becomes even lower. Therefore, as shown in FIG. 4(a), the 200 KHz pulsed recording signal has a period Tm as shown in FIG. 4(b).
(=1/fm, fm=40KHz) at the notch (31)
When recording is made on the track (2) of the marker area (30) having the non-cut portion (32), the reproduced signal becomes as shown in FIG. Since this reproduced signal changes with a period Tm, it is directly transmitted within the control circuit (21) by fm (for example, 4
0KHz) B, P, F, fm B after waveform processing (band pass filter).

By passing P and F, the presence or absence of a marker signal can be detected easily and reliably.

(h) When the control circuit (21) detects the marker signal, it is determined that the lead-in area (3) has ended;
A stop signal is output to the motor drive circuit (23) and the CD (1
) stops rotating and ends recording on CD (1).

In the above embodiment, the marker is formed of a continuous cut portion with a constant period Tm and a non-cut portion to obtain a marker signal with a constant period Tm during reproduction, but the present invention is not limited to this. Any signal that can provide a marker signal that can be distinguished from a data signal during reproduction may be used. For example, it may be a marker that provides a marker signal with a sweep waveform whose period changes.

In the above embodiment, in the case of a compatible format in which the innermost circumference of a CD track is used as a lead-in area, the innermost circumference and the outermost circumference are used as a read-in area and a store area, respectively. In the case of a compatible format in which the lead-in area is the innermost periphery and the outermost periphery, the innermost periphery and the outermost periphery may be used as the store area and the lead-in area, respectively.

In the embodiment described above, a plurality of pieces of recorded data (music data) are recorded on a CD in multiple batches over several days and then are formatted in a compatible format. However, the present invention is not limited to this; This also applies when recording data on a CD multiple times during the day and then formatting it in a compatible format, or recording only one piece of recorded data (for example, music data for one song) and then formatting it in a compatible format. Available.

In the above embodiment, a method for recording predetermined data on a CD in an optical digital audio disc has been described, but the present invention is not limited to this, and can also be applied to a method for recording predetermined data on an optical video disc. can do.

[Effects of the Invention] As described above, the method for recording data on an optical disc according to the present invention, at the time of recording, first records a marker in the marker area in order to obtain a marker signal that can be distinguished from a playback signal at the time of recording lead-in data. Then, recording data and lead-in data corresponding to this recording data are recorded in the recording area and the store area, and when the recording of a predetermined amount of recording data is completed and a compatible format is performed, the lead-in data recorded in the store area is recorded. Since data is transferred and recorded in the original lead-in area, a separate recording device, which was conventionally required, is no longer required, and compatible formatting of the optical disc becomes simple and reliable. Moreover, a marker is recorded in the marker area, and the playback signal is monitored when lead-in data is transferred to the lead-in area, and if a marker signal is detected during this monitoring, the rotation of the optical disc is stopped and recording ends. Therefore, the end of the recordable range of the lead-in area can be reliably detected, and unnecessary signals are not recorded in the recording area.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the method for recording data on an optical disc according to the present invention. FIG. 1 is a block diagram of an apparatus for carrying out the method of the present invention, and FIG. compact disc (CD)
FIG. 3 is an explanatory diagram illustrating recording and reproduction signals for the non-cut portion of the marker in the marker area, FIG. 4 is a waveform diagram showing recording and reproduction signals for the marker in the marker area, and FIG. Conventional playback-only compact disc (
FIG. 3 is a plan view showing a compatible format state of a CD. (1)... Compact disc (CD) (optical disc), (2)... Track, (3)... Lead-in area, (4)... Recording area, (10)... Kugata circuit,
(12)...CD format encoder, (13
)...Selector switch, (17)...Data line for recording, (18)...Optical head, (19)...Reproduction circuit, (21)...Control circuit, (22)...・Memo 1c (26) - Laser light, (29) Store area, (3o) Marker area, (33) Marker applicant Fujitsu General Ltd.

Claims (1)

[Claims] A lead-in area, a marker area, a recording area, and a store area are provided along either from the inner periphery to the outer periphery or from the outer periphery to the inner periphery of a spiral track formed on an optical disk, and recording is performed. At times, a marker is first recorded in the marker area to obtain a marker signal that can be distinguished from a playback signal when recording lead-in data, and then recorded data and read data corresponding to this recorded data are recorded in the recording area and store area. and during compatible formatting, first transfer and record the lead-in data in the store area to a memory, then transfer and record the lead-in data in this memory to the lead-in area while monitoring the playback signal, A data recording method for an optical disc, characterized in that transfer recording to the lead-in area is stopped based on the detection of the marker signal during this monitoring.