JPH0581993B2 - - 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 manufacturer's side, so compatible formats are not possible. There were no particular problems with recording with Matsuto.

[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, Beethoven's music is recorded as the first song.
If you add Schubert's music as the second song on the second day, etc., the lead-in data that should 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 based on a method for recording data on a write-once optical disc from an inner circumference to an outer circumference or from an outer circumference to an inner circumference of a spiral track formed on an optical disk. a lead-in area along either side of the
A marker area, a recording area, and a store area are provided, a marker is recorded in the marker area for obtaining a marker signal that can be distinguished from a playback signal when recording lead-in data, and after recording data in the recording area, Lead-in data corresponding to this recorded data is recorded in the store area, and at the time of 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 transferred to the lead-in area. Monitor the playback signal while recording the transfer,
The present invention is characterized in that transfer recording to the lead-in area is stopped based on the detection of the marker signal during this monitoring.

[Function] Record data (e.g. music data) from the input circuit
When the record button is pressed to input , a marker is first recorded in the marker area to obtain a marker signal that can be distinguished from the playback signal when recording lead-in data, and then the recording data is recorded in the recording area. Furthermore, lead-in data corresponding to this recorded data is recorded in the store area. When a signal for compatible format is input from the input circuit, the lead-in data in the store area is first transferred to and recorded in the memory, then the lead-in data in this memory is transferred and recorded in the lead-in area, and simultaneously played back during this transfer and recording. Signals are 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 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 recorded data. It is connected via a common terminal 16 and a recording data line 17 to the recording input side of an optical head 18 for recording and reproduction. 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 . A memory 22 is provided within the control circuit 21 for recording lead-in data. 1 is a CD (compact disk) of optical digital audio disks, which is an example of an optical disk.
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 denotes the optical head 18.
This is a servo mechanism that controls the movement of the CD 1 in the radial direction and also controls the focusing, tracking, etc. of the laser beam 26 irradiated from the optical head 18 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. 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 T ₁ (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 open contact 27 side, and outputs a marker signal to the first signal line _l1 ,
This marker signal is transmitted to the recording data line 17.
Output to . The control circuit 21 further includes:
From the input circuit 10 through the A-D conversion circuit 11,
The lead-in data recorded in the store area 29 of the CD 1 is read out based on the compatible format signal inputted via the second signal line _l2 , and this lead-in data is transferred to the playback circuit 19.
a transfer recording means that transfers and records information to the memory 22 in the control circuit 21 via a transfer recorder;
a servo control means for positioning the starting end 3s of the lead-in area 3 by moving it inward from the vicinity of the starting end 4s of the recording area 4 by an approximate distance (for example, 2 to 3 mm) necessary for the lead-in area; and rotation control means for causing the CD 1 to rotate in the forward direction; and during the forward rotation, the lead-in data in the memory 22 is transferred and recorded from the start end 3s of the lead-in area 3 of the CD 1 toward the end end 3e, and the lead-in data is The apparatus also includes transfer recording monitoring means for monitoring reproduction signals during recording.

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.

(a) First, assume that on the first day, the record button is pressed to record Beethoven's music data A as the recording data for the first song. When you press the record button,
It is read whether lead-in data is recorded in the store area 29 of the CD 1, and if it is not recorded, it is determined that the music data A is the first data, and the changeover switch 13 is activated by a changeover signal from the control circuit 21. The strip 15 switches from the normally closed contact 14 to the normally open contact 27, and a marker distinguishable from a data signal is sent from the control circuit 21 to the optical head 18 via the first signal line l ₁ , the changeover switch 13, and the recording data line 17. A signal is transmitted for a certain period of time (for example, 0.1 seconds), and as shown in FIG.
with a predetermined period Tm = 1/fm (for example, fm = 40KHz)
A marker 33 in which a cut portion 31 and a non-cut portion 32 are formed is recorded.

(b) After a certain period of time _T1 has elapsed, the switching signal from the control circuit 21 disappears and the movable piece 15 of the changeover switch 13 returns to the normally closed contact 14, and the music data A input from the input circuit 10 and the CD format are The lead-in data a added by the encoder 12 is the normally closed contact 1 of the changeover switch 13.
4. Recording data line 1 via common terminal 16
As shown in FIG.
Data is recorded in the recording area 4 of the spiral track 2 and in the store area 29 provided at the outermost periphery of the track 2 from the inner periphery of the track 2 toward the outer periphery.

(c) 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, D and corresponding lead-in data b, c, d are stored in the recording area 4 as shown in FIG. 2 in the same manner as in (b) above. and store area 29, respectively. At this point, nothing is recorded in the lead-in area 3.

In addition, music data B, C, D after the second song
During additional recording, when pressing the record button to read whether lead-in data has been recorded in the store area 29 of CD 1, since lead-in data a corresponding to music data A has already been recorded, the control circuit No switching signal is output from 21,
The movable piece 15 of the changeover switch 13 is a normally closed contact 14
remains connected to.

(d) Once all music data A, B, C, D and corresponding lead-in data a, b, c, d have been recorded on CD 1, a compatible program is created to make this CD 1 playable on each manufacturer's player. Format. That is, when the formatting button of the input circuit 10 is pressed and a signal for compatible formatting is input to the control circuit 21 via the second signal line _l2 , the transfer recording means of the control circuit 21 first formats the CD 1. The lead-in data a, b, c, d recorded in the store area 29 are reproduced by the optical head 18,
The data is transferred and recorded in the memory 22 via the reproduction circuit 19.

(E) 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.

(F) 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.

(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, 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.

(H) 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 embodiment described above, the marker is formed of a 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 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 disk 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 disk. 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, a marker area is provided between the lead-in area and the recording area,
In this marker area, a marker is recorded to obtain a marker signal that can be distinguished from the playback signal when recording lead-in data, and the playback signal is monitored when lead-in data is transferred to the lead-in area, and during this monitoring, the marker signal is When this is detected, the rotation of the optical disc is stopped and recording ends, so the end of the recordable range in the lead-in area can be reliably detected, and unnecessary signals can be prevented from being recorded in the recording area. do not have.

[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, 13...Switchover switch, 17...Recording data line, 18...Optical head, 19...Reproduction circuit, 21...Control circuit, 22...Memory, 26...Laser light, 29...
...Store area, 30... Marker area, 33...
marker.

Claims (1)

[Claims] 1. 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 the spiral track formed on the optical disk,
A marker is recorded in the marker area to obtain a marker signal that can be distinguished from a playback signal when recording lead-in data, and after recording data in the recording area, lead-in data corresponding to this recorded data is recorded in the marker area. recording in a store area, and at the time of 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 a write-once 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.