JPH0581994B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical disc that allows additional recording on the user side (hereinafter simply referred to as a write-once optical disc).
The present invention relates to a data recording method.

[Prior Art] In recent years, optical disks (optical disk-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 an optical disk on each player of different manufacturers, the recorded data and the
It is necessary that lead-in data (address data) corresponding to this be recorded in a compatible format. For example, in a playback-only compact disc (hereinafter simply abbreviated as CD) in an optical digital audio disc, the fifth
As shown in the figure, a lead-in area 3 is provided at the innermost circumference of the spiral track 2 formed on the CD 1, and a recording area 4 is provided continuously at the terminal end 3e of this lead-in area 3. Record data A, B, C, and D such as music data in the recording area 4,
Lead-in data a, b, c, and d such as time information and frame numbers for recording data A, B, C, and D are recorded in the lead-in area 3. Conventional CD1
is for playback only, so the recording data A, B, C, D and the corresponding lead-in data a, b, c, d to be recorded on CD 1 are known in advance at the time of original cutting on the producer's side, so they are compatible. There were no particular problems with recording in format.

[Problems to be solved by the invention] However, the above-mentioned CD can be additionally recorded on the user side (i.e., a write-once CD).
When I tried to do this, the following problems arose.

When the user records multiple types of music data on one CD in several parts, for example, on the first day, the user may record Beedoven's music as the first song.
If you add Schubert's music as the second song on the second day, etc., the lead-in data to be recorded in the lead-in area will change each time you add a song on the first day, second day, etc. Because I end up doing it,
Lead-in data can only be written and recorded after all songs have been recorded on the CD. Therefore, when recording lead-in data, it is necessary to detect the end of the recordable range (starting point of the recording data), but there is a problem in that it is difficult to accurately detect.

The present invention was made in view of the above-mentioned problems.
It is an object of the present invention to provide a method for simply and reliably recording recording data and corresponding lead-in data in a compatible format on a write-once optical disc.

[Means for Solving the Problems] The data recording method for a write-once optical disc according to the present invention is a method for recording data on a write-once optical disc when manufacturing an optical disc. A spiral track is formed along one side to form a lead-in area, a marker area, a recording area, and a store area, and a marker signal is obtained in the marker area that can be used to identify a reproduced signal when recording lead-in data. At the time of additional recording, after recording data in the recording area, lead-in data corresponding to this recording data is recorded in the store area, and at the time of compatible formatting, the lead-in data is first recorded in the store area. Lead-in data is transferred and recorded in a memory, and then the lead-in data of this memory is transferred and recorded in the lead-in area while monitoring the playback signal, and the lead-in data is transferred and recorded in the memory, and the read-in data is monitored based on the detection of the marker signal during this monitoring. This feature is characterized in that transfer recording to the area is stopped.

[Operation] When manufacturing an optical disc, a marker is formed in the marker area to obtain a marker signal that can be distinguished from a reproduction signal when recording lead-in data. When the record button is pressed to input recording data (for example, music data) from the input circuit, the marker signal in the marker area is detected first, and when this marker signal disappears, it is a recording area, so the recording data is stored in this recording area. is recorded, and then lead-in data corresponding to this recorded data is recorded in 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.
The lead-in data of this memory is then transferred and recorded in the lead-in area, and the reproduction signal is monitored at the same time as this transfer and recording. 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 way, by detecting the marker signal, it is possible to accurately detect the end of the recordable area for lead-in data.

[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 carrying out the data recording method according to the present invention. In this figure, numeral 10 is for inputting recording data such as audio signals and signals for compatible format from a microphone or line. This is the input circuit. The output side of this input circuit 10 is connected to a CD format encoder 12 via an A-D conversion circuit 11. The CD format encoder 12 is
This is a circuit that adds lead-in data such as time data, frame number data, error correction data, etc. corresponding to the recording data, and the data output from this CD format encoder 12 is connected to the recording data line 1.
Optical head 18 for recording and playback via 7
connected to the recording input side of the The reproduction output side of the optical head 18 is connected to an audio signal output terminal 20 via a reproduction circuit 19 and also to a control circuit 21 . The control circuit 21 includes a memory 2 for recording lead-in data.
2 is provided. 1 is an optical digital audio disk as an example of an optical disk.
A CD (compact disc), the CD 1 is controlled to a predetermined rotational speed by a motor 24 driven by a drive signal from a motor drive circuit 23. 25 controls the movement of the optical head 18 in the radial direction of the CD 1, and also controls the movement of the optical head 18.
This is a servo mechanism that controls the focus, tracking, etc. of the laser beam 26 irradiated from the CD 1 to the CD 1. The control circuit 21 is mainly composed of a CPU (central processing unit) and is configured to control the CD format encoder 12, the playback circuit 19, the motor drive circuit 23, and the servo mechanism 25. Further, based on the compatible format signal inputted from the input circuit 10 via the A-D conversion circuit 11 and the first signal line _l1 , the
a transfer recording means for reading lead-in data recorded in the store area 29 of the CD 1 and transferring and recording the lead-in data to the memory 22 in the control circuit 21 via the reproduction circuit 19; By controlling the servo mechanism 25, the laser beam 26 is moved inward from the vicinity of the starting end 4s of the recording area 4 by an approximate distance (for example, 2 to 3 mm) required for the lead-in area, and the starting end 3s of the lead-in area 3 is moved inward. a servo control means for positioning the CD 1; a rotation control means for causing the CD 1 to rotate forward after this positioning; and a rotation control means for causing the CD 1 to rotate forward after this positioning;
2 from the starting end 3s to the ending end 3e of the lead-in area 3 of the CD 1, and a transfer recording monitoring means for monitoring the playback signal at the time of recording the lead-in data. .

Note that the storage area 2 in the transfer recording means
9 to the memory 22, even if the lead-in data recorded in the store area 29 has a high degree of signal redundancy, it is combined by the reproduction circuit 19 into lead-in data with a low degree of signal redundancy. It is then recorded in the memory 22. Further, the control circuit 21 is configured to output a motor stop signal to the motor drive circuit 23 based on the detection signal when detecting a marker signal while monitoring transfer recording, and to stop recording on the CD 1. ing.

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

(b) First, when the manufacturer manufactures the CD 1, as shown in FIG. 2, the lead-in area 3, marker area 30, recording area 4 and A store area 29 is formed, and a marker area 30 has a predetermined period Tm=1/fm (for example,
A marker 33 is formed, which includes a cut portion 31 cut at a frequency of fm=40KHz) and a non-cut portion 32. The track length of this marker area 30 is set to a constant period T ₁ (for example, 0.1 seconds).

(b) Next, when recording data onto CD 1 on the user's side, assume that on the first day the user presses the record button in order to record music data A by Behdoven as the recording data for the first song. Then, first, the servo mechanism 25 and the motor drive circuit 23 are controlled by the control signal from the control circuit 21, and the laser beam 26 of the optical head 18 comes to the area inside the marker area 30 (for example, the lead-in area), and the CD 1 is moved. It rotates forward and enters playback mode. After the marker signal is detected during this reproduction, when the detection signal disappears, the recording area becomes a recording area where nothing has been recorded yet, so the recording mode is entered.

(c) In this recording mode, the music data A input from the input circuit 10 and the lead-in data a corresponding to the music data A added by the CD format encoder 12 are transferred to the optical head via the recording data line 17. As shown in FIG.
Recording area 4 of spiral track 2 of CD 1,
Data is recorded in a store area 29 provided at the outermost circumference of the track 2 from the inner circumference side to the outer circumference side of the track 2.

(d) Then, on the second, third, and fourth days, music data B, C, and D for the second, third, and fourth songs, respectively.
are additionally recorded, these music data B, C, and D and the corresponding lead-in data b, c, and d will be recorded in almost the same way as in (b) and (c) above.
As shown in FIG. 2, additional recording is made in the recording area 4 and the store area 29, respectively. At this point, nothing is recorded in the lead-in area 3.

(E) After recording of music data A, B, C, D and corresponding lead-in data a, b, c, d on CD1 is completed, write a compatible disc so that this CD1 can be played on each manufacturer's player. Format. That is, when a signal for compatible formatting is input to the control circuit 21 via the first signal line _l1 by pressing the formatting button of the input circuit 10, first, based on the control signal from the control circuit 21, Lead-in data a, b, c, d recorded in the store area 29 of the CD 1 are played back by the optical head 18,
The data is transferred and recorded in the memory 22 via the reproduction circuit 19.

(f) Next, the servomechanism control means of the control circuit 21 moves 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, 2.5 mm) to reach the starting end of the lead-in area 3. Position the section 3s.

(g) Then, by the rotation control means of the control circuit 21
The CD 1 is rotated in the forward direction, and during this forward rotation, the transfer record monitoring means of the control circuit 21 causes the memory 2 to
Lead-in data No. 2 is transferred and recorded from the starting end 3s to the ending end 3e of the lead-in area 3, and the reproduction signal is monitored.

(H) 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, it is detected that the recorded data signal modulated by the lead-in data or the lead-in data has disappeared. Recording signal (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 c in the same figure. That is, when the recording signal is H (when the laser power is at a high recording level), the incision has not yet progressed at the first spot _S1 of the incision (membrane non-destructive state), so the level of the reproduction signal becomes high. At spots S ₂ and S ₃ in the middle and at the end, the incisions are made sufficiently (membrane destruction state), so the level of the reproduction signal becomes low, and furthermore, when the recording signal is L (reproduction level with low laser power), The level of the reproduced signal becomes even lower. Therefore, as shown in Figure 4a, the 200KHz pulsed recording signal has a period Tm (=1/fm,
fm=40KHz), the reproduced signal becomes as shown in FIG. Since this reproduction signal changes with a period Tm, it is directly transmitted to fm (for example, 40KHz) within the control circuit 21.
As soon as it passes through the BPF (band pass filter),
By passing the waveform through the FM BPF after processing the waveform, the presence or absence of a marker signal can be easily and reliably detected.

(li) When the marker signal is detected by the control circuit 21, it is determined that the lead-in area 3 has ended, and a stop signal is output to the motor drive circuit 23.
Stop the rotation of CD1 and finish recording on CD1. In the above embodiment, at the time of manufacture on the manufacturer's side, the markers formed in the marker area of the track of the CD are formed by a notch part and a non-notch part with a constant period Tm, and during playback, a marker signal with a constant period Tm is generated. However, the present invention is not limited to this, and any marker signal that can be identified as a data signal during reproduction may be obtained. 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 the CD track is the lead-in area, the innermost circumference and the outermost circumference are used as the lead-in area and the 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 store area and the lead-in area may be used, respectively.

In the embodiment described above, a plurality of pieces of recorded data (music data) are recorded on a CD in multiple batches, but the present invention is not limited to this. It can also be used when recording only data) and converting it into a compatible format.

In the above embodiment, a method for recording predetermined data on a CD in an optical digital audio disc was explained, 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, in the data recording method for a write-once optical disc according to the present invention, one of the innermost circumference and the outermost circumference of the spiral track of the optical disk is used as a lead-in area, and the other is used as a storage area. When recording data, the lead-in data corresponding to the recorded data is first recorded in the store area, and when a predetermined amount of data has been recorded and a compatible format is performed, it is recorded in the store area. Since the read-in lead-in data is transferred and recorded in the original lead-in area, the compatible format of the optical disc becomes simple and reliable. Moreover, when manufacturing optical discs, a marker is formed in the marker area provided between the lead-in area and the recording area to obtain a marker signal that can be distinguished from the playback signal when recording lead-in data. monitors the playback signal during lead-in data transfer,
If a marker signal is detected during this monitoring, the rotation of the optical disc is stopped and recording is terminated. This makes it possible to reliably detect the end of the recordable range in the lead-in area, and also to remove unnecessary No signal is recorded.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the data recording method for a write-once 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. A plan view of a compatible formatted compact disc (CD). Fig. 3 is an explanatory diagram illustrating the recording and playback signals for the non-cut portion of the marker in the marker area. Fig. 4 is a diagram for explaining the recording and playback signals for the marker in the marker area. FIG. 5 is a plan view showing a compatible format state of a conventional playback-only compact disc (CD) produced by original cutting. 1... Compact disc (CD) (optical disc), 2... Track, 3... Lead-in area,
4... Recording area, 10... Input circuit, 12...
CD format encoder, 17... Recording data line, 18... Optical head, 19... Playback circuit, 21... Control circuit, 22... Memory, 26
...Laser light, 29...Store area, 30...Marker area, 33...Marker.

Claims (1)

[Claims] 1. When manufacturing an optical disc, a spiral shape that forms a lead-in area, a marker area, a recording area, and a store area along either from the inner circumference to the outer circumference or from the outer circumference to the inner circumference of the optical disk. At the same time, a marker is formed in the marker area to obtain a marker signal that can be distinguished from a reproduction signal when recording lead-in data, and when additional recording is performed, after recording data in the recording area, a marker is formed in the marker area. , record lead-in data corresponding to this recorded data in the store area, and at the time of compatible formatting, first transfer and record the lead-in data in the store area to the memory, and then transfer the lead-in data in this memory to the lead-in data. A write-once optical disc characterized in that the playback signal is monitored while being transferred and recorded in the lead-in area, and the transfer and recording to the lead-in area is stopped based on the detection of the marker signal during this monitoring. Recording method.