JPH04155669A - Optical information recorder/reproducer - Google Patents

Abstract

PURPOSE:To prevent a default of a signal necessary at the time of reproducing and to correctly add it by processing an additional information signal by including a timing replacement together with an additional auxiliary signal. CONSTITUTION:When an information signal is added, an additional position on a disk 1 is detected by a detector 9 from a reproduction signal of a circuit 8, a control for substantially fixing an optical head 2 at a position to be added through an error detector/servo circuit 4 is conducted. In this case, the auxiliary signal, and a subcode regarding at least one of a position, an order and a time are formed by a signal generator 10. The additional signal from an input unit 11 and the auxiliary signal from the generator 10 are combined, processed by including a timing replacement by a signal processor 12, added with a subcode, converted to a signal train adapted for various types of information recorders, and then recorded on the disk 1 though the head 4 by a signal recording system 13.

Description

[Detailed Description of the Invention] [Purpose of the Invention (Industrial Application Field) The present invention relates to an optical information recording/reproducing device, and in particular to a CD
The present invention relates to an optical information recording/reproducing device that enables additional recording using a signal recording method such as the above.

(Prior Art) There are various methods of optical information recording and reproducing devices that record and reproduce information by irradiating a light beam onto a recording medium, one of which is write-once (WO) or (W O).
There is a write-once type called ORM).

In this write-once type optical information recording/reproducing device, a sector signal is formed in advance on the recording medium so that the position of the information signal can be confirmed, or a special signal is recorded so that the position of the information signal can be determined. The necessary information signals are selected by detecting these signals during playback.

Information signals are recorded in units called sectors or blocks, and are managed by location information called addresses.

When performing additional recording, unrecorded portions are detected in units of sectors or blocks, and new information signals are recorded there. In this way, there is no relationship between the position where the information signal is recorded and the time, and therefore there is no temporal continuity between the information signals recorded at physically consecutive positions on the medium. Such a write-once method is mainly used in storage devices of information processing systems, and is suitable for processing information signals over a short period of time.

On the other hand, in a system that records temporally continuous information signals such as audio signals or video signals, or information signals that change over time, as typified by compact discs (CDs), information that is sampled at certain time intervals is recorded. A method is used in which the signal is divided in time, rearranged in time using a predefined method for error correction, and then recorded on a recording medium. According to this method, even if an error occurs in the recorded signal due to damage to the recording medium or the like, the error can be detected and corrected as long as the error is within a certain range. Conversely, in order to correctly reproduce data at a certain time, it is necessary to read out all the data that was replaced during recording. However, when data is divided on a recording medium as in a conventional write-once optical information recording/reproducing device, it is possible to correct errors to a certain extent, just as in the case of a damaged disk, but it is not always possible to correct errors. It is not complete and information may be missing.

Problems in realizing a write-once information recording/reproducing device using the CD signal recording format will be explained. As is well known, on a CD, the information signal to be recorded is an error correction code, CIRC (Cross Interleave Reproduction Code).
ed-3olomon Code),
Zarani E F M (Eight t.

Fourteen Modulation Code)
is modulated and recorded on the disc.

Figure 3 is a diagram showing the CIRC encoding method,
The following is a quotation from the document "Optical Disk System" published by Japan Society of Applied Physics, Kogaku Konwa Complete Edition, published by Shokusen Shoten (1989), page 182. This is P, Q: GF (
28) is an example of the Reed-Solomon code, and (a) to (
The symbol g) is added for explanation. As shown in (a) of the same figure, the information signal consists of 16-bit data sampled at 44.1 kHz, and is divided into 16 bits or 8 bits each for the upper and lower 8 bits of data for a total of 2 channels of R. and R are alternately input to the CIRC encoder. The information signal has six samples forming a signal unit called a frame, and signal demodulation during reproduction is performed in units of frames, forming one block for error correction. Ninety-eight frames of the information signal constitute a unit called one main frame or one subcode block, and 75 main frames represent one second of audio information.

Further, a frame synchronization signal is inserted for each frame, and during reproduction, this frame synchronization signal is used to control the rotational speed of the recording medium (disc) to keep the linear velocity constant.

A portion of the sampled information signal passes through a two-frame delay circuit as shown in FIG. 3(b), and then the information signal is replaced (called scrambling). An error correction code C2 is added to the scrambled information signal as shown in FIG. 3(C), and then an error correction code C2 is added as shown in FIG. 3(d).
Interleaving is performed by giving each information signal a time delay equivalent to a different number of frames, as shown in FIG.
After 1 is added, odd-numbered data is outputted from the CIRC encoder as shown in (g) of the same figure via a one-frame delay circuit as shown in (f) of the same figure.

Here, the subcode is an information code included in the CD standard, and there are eight types of subcodes: P-W. Of these, P and Q are used in music CDs, where the P code represents the start of the information signal, and the Q code represents information regarding the position, respectively. That is, the subcode is information regarding the position, order, or recording time of the information signal. The position information consists of the information signal number, index, time, and mainframe number. There are two types of time information: absolute time, which is measured through a recording medium in minutes and seconds, and relative time, which is measured for each information signal. In a CD, information signals can be searched using this Q code.

FIG. 4 shows the time relationship of information signals before and after CIRC encoding. The amount of delay of the unit information signal mentioned earlier is C
In D, the maximum number of frames is 108. Therefore, for example, if recording is interrupted at the (M-1)th main frame and the information signal of the M-th mainframe is lost, the information signal of the (M-2)th main frame is interrupted.

(M-1) A part of the signal necessary for restoring the main frame information signal during reproduction is lost.

If another information signal is additionally recorded as the M-th main frame after this interruption, it is possible that the information signals before and after the interruption do not match. Therefore, in either case, the information signal cannot be correctly reproduced and demodulated. For these reasons, various information signals are recorded on a CD in advance, and a CD-ROM (CD-ROM) is used as an information processing system storage device.
A write-once recording and reproducing device that combines the features of both ReadOnly Memory and WORM has not been realized.

JP-A No. 63-27172 discloses a method of counting the time of an unrecorded portion using the number of tracks as information regarding the position of an information signal, but does not describe a method for additionally writing an information signal. do not have.

Further, Japanese Patent Laid-Open No. 63-298835 discloses a method of recording a frame synchronization signal on a disk for additional recording. In this method, the linear velocity is constant (
Although it is possible to rotate a disc using the CLV) method, there is no mention of the problems with the write-once CD standard mentioned above, and this is not sufficient as a technology for recording signals in the CD signal recording format.

(Problems to be Solved by the Invention) As described above, in the conventional technology, when recording information signals, such as on a CD (compact disc), temporal replacement is performed, it is difficult to add information signals. If this is done, the signals necessary for restoration may be lost, which limits its use as a storage device for recordable information processing systems.

The present invention was made in order to solve the problems of the prior art, and it is possible to restore the information signal during reproduction in a method in which the information signal is temporally divided and recorded by temporally replacing the information signal. It is an object of the present invention to provide an optical information recording and reproducing device that can perform correct additional recording without damaging signals necessary for data processing.

[Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention detects the additional recording position on the recording medium at which the additional information signal should be recorded, and also detects the additional recording position on the recording medium where the additional recording information signal is to be recorded. Generate an auxiliary signal for additional writing using the signal, perform predetermined processing including temporal replacement, such as error correction coding processing, on the combined information signal and auxiliary signal for additional writing, and record at an additional recording position. It is characterized by The additional writing auxiliary signal is added, for example, to the beginning and end of the additional writing information signal.

In addition, in a device that records an information signal that has been subjected to a predetermined process including temporal permutation, and adds information regarding at least one of the position, order, and recording time of the information signal, the information is recorded at a low recording rate. The information signal is formed by referring to the information of the information signal.

(Operation) By combining the postscript information signal with the auxiliary postscript signal and performing processing including temporal replacement, necessary signals will not be lost during playback, and correct postscript can be performed. Furthermore, when information regarding at least one of the position, order, and recording time of the information signal is recorded together, these pieces of information can also be recorded without contradiction before and after additional recording.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an optical information recording/reproducing apparatus according to an embodiment of the present invention. Recording and reproduction is performed by irradiating a disc-shaped information recording medium (hereinafter referred to as a disc) 1 with a laser beam 3 from an optical disc 2. Focus and tracking error signals output from a photodetector within the optical head 2 are input to an error detection/servo circuit 4. A servo signal is supplied from the error detection/servo circuit 4 to a focus and tracking actuator in the optical head 2, thereby controlling the focus and tracking of the laser beam 2 on the disk 1. Further, the optical head 2 further controls the position of the disk 1 in the radial direction based on a head feed servo signal from an error detection/servo circuit 4.

When reproducing the information signal, the changeover switch 5 is connected to the (a) side, and the disk motor rotation is controlled according to the synchronization signal included in the signal reproduced by the information reproducing circuit 8 from the RF signal output of the photodetector in the optical head 2. A system circuit (motor drive servo circuit) 6 controls the rotation of the disk motor that rotationally drives the disk 1 .

On the other hand, when an information signal is additionally recorded, the recording position detection circuit 9 detects the additional recording position on the disk 1 from the reproduction signal of the information reproduction circuit 8, that is, the interrupted portion of the already recorded information signal (hereinafter referred to as a low recording information signal). is detected, and at that position, a signal is sent to a control system (not shown) as a standby state for additional writing, and at the same time, control is performed via the error detection/servo circuit 4 to approximately fix the optical head 2 at the position where additional writing is to be performed. At this time, information regarding at least one of the position, order, and time of the low recording information signal is reproduced from the tail portion of the interrupted information signal, and the information signal to be additionally recorded (
In order to reproduce the additional recording information signal (hereinafter referred to as the additional recording information signal) without inconsistency with the low recording information signal, the additional recording auxiliary signal generation circuit 10 generates the additional recording auxiliary signal and information regarding at least one of position, order, and time. code) is formed.

Then, the postscript information signal inputted from the postscript information input section 11 and the postscript auxiliary signal from the postscript auxiliary signal generation circuit 10 are combined, and this combined signal is processed in the signal processing system 12 for processing including temporal replacement. At the same time, a subcode is added to the signal and converted into a signal sequence suitable for various information recording devices, and then recorded on the disk 1 by the signal recording system 13 via the optical head 4. At this time, the optical head 2, which has been approximately fixed at the additional recording position, is controlled in position so as not to destroy the low recording information signal, and starts the operation of following the track.

The rotation control of the disk 1 is described in, for example, Japanese Patent Publication No. 1-23859.
This can be done using signals included in tracks as shown in the above publication. In that case, changeover switch 5 (
b) side, the disc motor rotation control system circuit 6 extracts the signal included in the track from the output of the error detection/servo circuit 4, and controls the rotation of the disc motor accordingly. Furthermore, by detecting the mechanical position of the optical head 22 with respect to the disk 1,
The rotation of the disk 1 can be controlled. In addition, various methods can be used to control the rotation of the disk 1.

FIG. 2 shows, as a specific example, an embodiment in which the present invention is applied to a recording and reproducing apparatus using a CD (compact disc) as a recording medium. Similar to Figure 1, disk (CD)
21, a laser beam 2 is emitted from the optical pickup head 22.
3 is irradiated, recording and reproduction are performed. Focus and tracking error signals output from the photodetector in the optical pickup head 22 are input to a focus servo circuit 24 and a tracking servo circuit 25, respectively.

By supplying servo signals from the focus servo circuit 24 and the tracking servo circuit 25 to the focus and tracking actuator in the optical pickup head 22, focus and tracking control of the laser beam 23 on the disk 21 is performed. Further, the position of the head 22 in the radial direction of the disk 21 is controlled by the optical pickup head feed servo circuit 28 in accordance with the head feed servo signal from the tracking servo circuit 25. The disk 21 is rotated by a disk motor 26 controlled by a motor drive servo circuit 27 .

The RF multiplied signal obtained by reading the information signal on the disk 21 by the optical pickup head 22 is input to the clock extraction/EFM demodulation circuit 3o1, where the clock is extracted and EFMffEg is performed. The extracted clock is also supplied to the motor drive servo circuit 27.

The EFM demodulated signal is input to the frame synchronization/subcode readout circuit 31, where the frame synchronization signal is extracted and the subcode is further read out, and then the deinterleave/CIRC decoder/error correction/correction circuit 3
2 is input. This circuit 32 deinterleaves the input signal, performs CIRC decoding and error correction.
It is corrected and output to the D/A converter 33. D/A
The analog output from the converter 33 is the controller 4
5 is outputted through the data output device 34 under the control of the data output device 34.

When a controller 45 using a microcomputer receives a command to start recording, it moves the optical pickup head 22 to the recording position via the servo circuit 28, and directs the laser beam 23 onto the track at the recording position.
fix the spot. This can be achieved, for example, by repeating the operation of detecting the presence or absence of the EFM signal and causing the laser beam 23 to jump one track toward the inner circumference of the disk 21 when the EFM signal disappears. At this time,
The final main frame subcode read from the frame synchronization/subcode reading circuit 31 is stored in the subcode memory 42.

The additional information signal to be recorded is input from the data input device 39 under the control of the controller 45, converted into a digital signal by the A/D converter 38, and then sent to the correction code addition/interleave/CI RC encoder circuit 37.
is input. This circuit 37 uses a write start data addition circuit 43 controlled by a controller 45 to
Additional recording start data is added to the additional recording information signal converted into a digital signal from the /D converter 38, and further processing of interleaving and addition of a correction code is performed. This circuit 3
The output data from 7 is input to the frame synchronization/subcode addition circuit 36 and is to be added to the additional information signal generated by the subcode generation circuit 41 based on the subcode stored in the subcode memory 42. A subcode is added along with the frame synchronization signal.

The output data of the frame synchronization/subcode addition circuit 36 is input to the clock insertion/EFM modulation circuit 35, and the EFM
M modulated. At this time, when an unrecorded area is detected by the head 22, the fixation of the irradiation track position of the laser beam 23 is released, and the additional information signal is recorded on the disk 21 via the optical pickup head 22 by synchronizing the clock. Ru. At this time, in order to adjust the waiting time until the unrecorded area reaches the irradiation position of the laser beam 23 due to the rotation of the disk 21 after EFM modulation, the EFM modulated postscript information signal is temporarily stored in the RAM 40, and a predetermined After a certain period of time, it is read out and returned to the clock insertion/EFM modulation circuit 35.

When the controller 45 receives the recording end command, it operates the additional write end data adding circuit 44. As a result, in the correction code addition/interleave/CIRC encoder 37, the postscript end data is added to the end of the postscript information signal from the A/D converter 38 via the postscript end data addition circuit 44, and correction code addition, interleaving, etc. After the processing, the signal is supplied to the optical pickup head 22 via the frame synchronization/subcode addition circuit 36 and the clock insertion/EFM modulation circuit 25, and is recorded on the optical disc 21.

Additional writing is performed on the disk 21 as shown in step 2. Even if an unrecorded part remains between the information signals before and after the added area during this additional writing, the memory (RAM) for time adjustment during playback
By using , it is possible to absorb the time lag.

In addition, changes in the level of focus error and tracking error signals due to the presence or absence of information signals can be detected by the AG for gain adjustment.
There is no problem by using a C circuit or the like.

When recording on the disk 21, only the portion necessary for correctly reproducing and demodulating the recorded information signal is recorded, and other portions are not recorded.

In addition, in the case of a CD, the rotation of the disk 21 is at a constant linear velocity (
CLV), but there is a method that changes the rotation speed according to the position based on the position information of the optical picker knob head 22, and a method that adds a CLV signal to the guide group of the disk 21 in advance and uses it. It is also possible to use a method of controlling the number of rotations using the rotation speed, and it is also possible to perform additional writing by switching between these methods.

Next, referring to FIGS. 5 and 6, a more specific explanation will be given using the CD format as an example.

As shown in FIG. 5, it is assumed that the beginning of the information signal data to be recorded (additionally written) shown in the upper row is the first of the first frame of the M-th main frame. Originally, there is no concept of mainframe or frame for information signals before encoding, but for the sake of explanation, to clarify the temporal relationship and correspond to the encoded signal, such mainframes etc. The concept shall be used. As mentioned above, when CIRC encoding an information signal, 10
Data from 8 frames before is required. 108 frames before the M-th main frame, which is the beginning of the postscript information signal data, is data of the (M-2)-th main frame.

Therefore, in the additional write start data adding circuit 43 of FIG. 2, as shown in the upper part of FIG. 5, the (M-2)-th pseudo additional write auxiliary signal is generated.

(M-1) Main frame data (for example, using blank data) is added to the beginning of the postscript information signal, these postscript auxiliary signals and the postscript information signal are combined, and then the circuit 3
In step 7, CIRC encoding processing including interleaving is performed. The arrangement of the information signals after interleaving is shown in the lower part of FIG. However, the (M-2)th after encoding.

(M-1) Mainframe data has no meaning.

In this case, in order to record the subcode (information such as position, order, time, etc.) on the previous and subsequent information signals on the disc without inconsistency, when additionally writing, the final main character of the previously recorded information signal stored in the subcode memory 42 is used. Referring to the subcode of the frame, a subcode forming circuit 41 forms a subcode to be recorded in the (M-2)th main frame.

That is, the final main frame of the recorded information signal is
M-1) Assuming that it is a main frame, reduce the information signal number and main frame number by 1. However, 75
The main frame is 1 second. Construct absolute time without contradiction, and also configure relative time and frames without contradiction. If there is no recorded edge information signal, data starts from number 1 and time and frame numbers start from 0. These operations may be performed automatically or may be performed externally through the controller 45.

In this way, a postscript information signal is recorded on the disc 21 from the first data of the first frame of the encoded Nth main frame together with the newly formed subcode.

On the other hand, assume that the end of the input information signal is the 98th frame of the Nth main frame. At this time, as mentioned above, a frame consists of 6 samples and constitutes one block for signal demodulation and error correction, so if it is not the end of the input information signal or the end of the frame, that is, the 6th sample,
For example, fill in blanks.

The information of the 98th frame of the information signal shown in the upper part of FIG. 6 is interleaved as shown in the lower part of FIG.
) reaching the mainframe. Therefore, in the additional write end data addition circuit 44 of FIG. 2, the (N+1)th and (N+2)th main frame data (
For example, after adding a blank), a circuit 37 performs correction code addition, interleaving, and CIRC encoding processing. Subcodes are also handled in the same way as normal input information signals. The arrangement of the information signals after interleaving is shown in the lower part of FIG. The (Nth) postscript information signal
+2) The main frame data reaches the (N+4)th main frame through interleaving (not shown), but since it is originally blank and has no meaning, it is necessary to record up to the (N+2) main frame on the disk 21. good.

Note that when doing the above, when additional writing is performed, the data of the (N+1)th and (N+2)th main frames and the (M-2)th main frame at the end of the input information signal are recorded.

(M-1) The mainframe data overlaps, but they are both blank and have a common subcode, so
No problems arise.

As described above, according to this embodiment, by adding additional writing auxiliary signals to the beginning and end of the additional writing information signal during additional writing, processing including temporal interleaving is performed like a CD. Even with the signal recording method, it is possible to make the recorded information signals continuous without causing any loss of information signals, and to correctly restore the information signals during playback. That is, it is possible to perform additional recording using the CD signal recording method, and it is possible to realize an optical information recording and reproducing apparatus that can perform additional recording as desired while using a CD as an information recording medium. Therefore, it is suitable as an information recording device used in various information processing systems.

In the above embodiment, a CD was taken as an example, and the auxiliary write signal was explained as two frames, so two frames of the auxiliary write signal are sandwiched between the information signals on the disc. However, this can be set arbitrarily depending on the signal recording format. Furthermore, even in the case of the CD format, depending on the position and order of the frames in the main frame, it is not necessarily necessary to provide additional writing auxiliary signals for two frames, but the basic idea is the same.

[Effects of the Invention] As explained above, according to the present invention, even in a signal recording format such as a CD signal recording format in which information signals are recorded after being subjected to predetermined processing including temporal replacement,
It is possible to add information signals. Furthermore, when information regarding at least one of the position, order, and recording time of the information signal is added and recorded, this information can also be recorded without inconsistency before and after the additional recording.

Therefore, according to the present invention, it is possible to provide an optical information recording/reproducing device that has both the characteristics of WORM and CD-ROM.

[Brief Description of the Drawings] Fig. 1 is a block diagram showing a basic embodiment of the present invention;
FIG. 2 is a block diagram showing a more specific embodiment of the present invention, FIG. 3 is a diagram for explaining the CIRC encoding method, and FIG. 4 is a diagram for explaining the effect of interrupting the information signal during additional writing. FIG. 5 is a diagram for explaining the interleaving operation at the beginning of the postscript information signal in the same embodiment, and FIG.
The figure is a diagram for explaining the interleaving operation at the end of the postscript information signal in the same embodiment. 1...Information recording medium 2...Optical head 8...Information reproducing circuit 9...Recording position detection circuit 10...Additional writing auxiliary signal generation circuit 11...Additional information input unit 12... Signal processing system 13...signal recording system 21...information recording medium 22...optical pickup head 31...frame synchronization/subcode readout circuit 32...de-interleaving/CIRC decoder/
Error correction/correction circuit 33...correction code addition/interleave/CIR
C encoder 36...Frame synchronization/subcode addition circuit 41...Subcode formation circuit 42...Subcode memory 43...Additional start data addition circuit 44...Additional end data addition circuit

Claims (2)

[Claims] (1) In an optical information recording and reproducing apparatus that performs recording and reproducing of information signals by irradiating a light beam onto a recording medium, the optical information recording and reproducing apparatus records the information signals by subjecting them to predetermined processing including temporal replacement, means for detecting an additional recording position on a recording medium at which an additional information signal should be recorded; means for generating an additional recording auxiliary signal using an already recorded information signal on the recording medium; and the additional recording information signal and the additional recording auxiliary signal. An optical information recording and reproducing apparatus comprising: means for performing predetermined processing including the temporal replacement of the signals; and means for recording the signal processed by the means at the additional recording position. (2) A device that records and reproduces information signals by irradiating a light beam onto a recording medium, which performs predetermined processing on the information signals, including temporal replacement, and changes the position, order, and recording time of the information signals. An optical information recording/reproducing device that records information with addition of at least one information, comprising means for detecting an additional recording position on a recording medium at which an additional information signal is to be recorded, and additional recording using an already recorded information signal on the recording medium. means for generating an auxiliary signal for additional writing; means for performing predetermined processing including the temporal replacement of the additional information signal and the additional recording auxiliary signal; and at least one of the position, order, and recording time of the additional information signal. means for forming information regarding one by referring to information regarding at least one of the position, order, and recording time of the recorded information signal; and the information formed by this means is converted into the signal subjected to the predetermined processing. An optical information recording/reproducing apparatus characterized by comprising: means for additionally recording at the additional recording position.