JP3606317B2 - Disc recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk recording apparatus.
[0002]
[Prior art]
Conventionally, a low-frequency marker that is out of the audible band or does not interfere with listening to sound by operating a predetermined key at a point you think is in the middle while recording a lecture with a tape recorder. There is known one in which (cue signal) is recorded on a tape.
[0003]
When playing a tape with this low-frequency marker recorded at high speed, the frequency of the reproduced marker falls within the audible band, and using this as a clue, you can search for the point of the recorded content and use it for tape editing, etc. Convenient.
[0004]
[Problems to be solved by the invention]
However, when using a tape as a recording medium, the tape must be fast-forwarded and rewound in order to search for the point where the marker is recorded, and it takes time to find the marker point. There was a serious problem.
[0005]
Further, in the conventional tape recorder as described above, the user operates the marker key after determining that it is the point while listening to a lecture, for example, so that the key operation is delayed by the time for content determination. Inevitably, the marker position on the tape is shifted downstream from the recording start point of the desired point.
[0006]
In addition, even if the marker key is touched by mistake, the marker is recorded on the tape, which hinders point search.
[0007]
In view of the above points, the present invention uses a disk as a recording medium, can easily search for marker points, and generates position information for search that is not substantially deviated from the desired marker points. It is an object of the present invention to provide a disc recording apparatus that can perform recording.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a disc device according to the present invention provides:
A disk recording device for marking a position during recording on a disk and writing the position in a predetermined area on the disk for later retrieval,
Means for identifying, as a first address, an address corresponding to the information position on the disc when a predetermined key is operated during recording;
Means for identifying a second address related to the first address by retroactive time, and writing the identified second address to a predetermined area of the disc;
Means for setting the retroactive time;
It is characterized by providing.
[0009]
According to the above configuration, when a predetermined key is operated during the recording operation, position information on the disk corresponding to the key operation is generated, and the address which is the position information is stored in a predetermined area on the disk. Written. During reproduction, a desired marker point on the disc is quickly detected based on this position information.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a case where the embodiment of the disk recording apparatus according to the present invention is applied to an audio data compression / decompression type magneto-optical disk recording / reproducing apparatus will be described with reference to FIG. 1, FIG. 2 and FIG.
[0011]
The configuration of one embodiment of the present invention is shown in FIG.
In FIG. 3, reference numeral 1 denotes an optical disk. In this example, a rewritable magneto-optical disk having a magneto-optical recording film and capable of recording / reproducing and erasing is used.
[0012]
The outer diameter of the disk 1 is 64 mm, and recording tracks are formed on the disk 1 in a spiral shape with a pitch of 1.6 μm, for example. The disk 1 is rotated at a constant linear velocity, for example, 1.2 to 1.4 m / s. The audio information is converted into a digital signal on the disc 1 and compressed and recorded, so that the target information can be recorded and reproduced by 130 Mbytes or more.
[0013]
In addition, a pre-groove for light spot control (for tracking control) is formed in advance on the disk 1. In particular, in this example, this pre-groove is superimposed on a tracking wobbling signal. The absolute address code is recorded. The disk 1 is housed in a disk cartridge 2 for dust prevention and scratch adhesion prevention.
[0014]
In addition, information related to the recorded audio data is recorded on the disc 1 at the innermost track position. This is generally called TOC (Table of content) and includes the number of recorded songs, information on the recording position of each song, the performance time of each song, and the like.
[0015]
[Recording system of recording / playback device]
The recording / reproducing apparatus shown in FIG. 3 is devised so that the configuration can be simplified as much as possible by using an IC. First, recording at the time of recording on a magneto-optical disk will be described. Note that, at the time of recording and at the time of reproduction, each circuit unit is configured to be switched in mode by a mode switching signal R / P from the system control circuit (microcomputer) 20.
[0016]
The system control circuit 20 is connected to a key operation unit 41 having a plurality of operation keys such as a recording key Kr, a reproduction key Kp, a stop key Ks, a marker key Km, and so on. It is specified.
[0017]
In this embodiment, the TOC memory 20m is connected to the system control circuit 20, and TOC data including position information about recording data, time information, and the like is temporarily stored as will be described later.
[0018]
The memory 20m can be set on a RAM in the microcomputer or on a buffer memory 25 described later.
[0019]
Two-channel analog audio signals that pass through the pair of input terminals 21LT and 21RT are sampled at a sampling frequency of 44.1 kHz in the A-D converter 22, and each sampling value is converted into a 16-bit digital signal. This 16-bit digital signal is supplied to the data compression circuit 23R. In this example, the input digital data is compressed to 1/5, for example. Various data compression methods can be used. For example, ADPCM (Adaptive Delta Pulse Code Modulation) having a quantization number of 4 bits is used.
[0020]
In addition, for example, the input digital data is divided into a plurality of bands so that the bandwidth becomes wider as the frequency is higher, and a plurality of samples for each divided band (the number of samples should be the same in each band) It is also possible to use a method in which a block is formed, orthogonal transformation is performed for each block in each band, coefficient data is obtained, and bit allocation is performed for each block based on this coefficient data. In this case, the data compression method takes into consideration human auditory sensation characteristics with respect to sound and can perform data compression with high efficiency (see Japanese Patent Application No. 1-278207).
[0021]
Thus, the digital data DA from the A / D converter 22 is compressed to 1/5 by the processing in the compression circuit 23R, and this data-compressed data da is transferred to the buffer memory 25 controlled by the memory control circuit 24. Is done. In this example, a D-RAM having a 1 Mbit capacity is used as the buffer memory 25.
[0022]
The memory control circuit 24 sequentially reads the compressed data da from the buffer memory 25 at a transfer speed of about 5 times the writing speed unless a track jump that causes the recording position on the disk 1 to jump due to vibration or the like occurs during recording. The read data is transferred to the data encoding circuit 26R.
[0023]
When it is detected that a track jump has occurred during recording, the data transfer to the encoding circuit 26R is stopped, and the compressed data da from the processing circuit 23R is stored in the buffer memory 25. Then, when the recording position is corrected, control is performed so that the data transfer from the buffer memory 25 to the encoding circuit 26R is resumed.
[0024]
Whether or not a track jump has occurred can be detected by, for example, providing a vibration meter in the apparatus and detecting whether or not the magnitude of vibration is such that a track jump occurs. Further, as described above, the absolute address code is recorded on the disk 1 of this example so as to be superimposed on the wobbling signal for tracking control when the pregroove is formed. Therefore, the absolute address code from the pregroove can be read at the time of recording, and the track jump can be detected from the decoded output. Further, the track jump may be detected by taking the OR of the vibration meter and the absolute address code. When a track jump occurs, the power of the laser beam for magneto-optical recording is lowered or the power is made zero.
[0025]
The recording position can be corrected when a track jump occurs using the absolute address code. In this case, as can be understood from the above, the data capacity of the buffer memory 25 can store the compressed data da corresponding to the time from when the track jump occurs until the recording position is correctly corrected. Minimum capacity is required. In this example, the capacity of the buffer memory 25 is 1M bits as described above, and this capacity is selected as having a margin so as to sufficiently satisfy the above conditions.
[0026]
In this case, the memory control circuit 24 controls the memory so that the data stored in the buffer memory 25 is reduced as much as possible during the normal operation during the recording. For example, when the amount of data in the buffer memory 25 exceeds a predetermined amount, a predetermined amount of data, for example, 32 sectors (one sector is one CD-ROM sector (about 2 Kbytes)) from the buffer memory 25. Memory control is performed so as to always ensure a writing space of a predetermined data amount or more after reading.
[0027]
The data encoding circuit 26R encodes the compressed data da transferred from the buffer memory 25 into data having a sector structure of a CD-ROM. Note that data including audio data for 32 sectors is hereinafter referred to as a cluster.
[0028]
The output data (cluster unit data) of the data encoding circuit 26R is supplied to the recording encoding circuit 27. The recording encoding circuit 27 performs encoding processing for error detection and correction on the data, and also performs modulation processing suitable for recording, in this example, EFM encoding processing. In this example, a code for error detection and correction is obtained by changing the interleaving for the CD CIRC (Cross Interleave Reed-Solomon Code). Since the recording data is intermittent data in units of clusters, a plurality of linking sectors for cluster connection are added before and after the cluster data of 32 sectors.
[0029]
Data subjected to the encoding process from the recording encoding circuit 27 is supplied to the magnetic head 29 via the magnetic head driving circuit 28. The magnetic head drive circuit 28 drives the magnetic head 29 so as to apply a modulation magnetic field according to the recording data to the disk 1 (magneto-optical disk). The recording data supplied to the head 29 is in cluster units, and recording is performed intermittently.
[0030]
Although the disk 1 is stored in the cartridge 2, when the apparatus is loaded, the shutter plate is opened and the disk 1 is exposed from the shutter opening. Then, the rotary shaft of the disk drive motor 30M is inserted and connected to the spindle insertion opening, and the disk 1 is rotated. In this case, the rotational speed of the disk drive motor 30M is controlled so as to rotationally drive the disk 1 at a linear speed of 1.2 to 1.4 m / s by a servo control circuit 32 described later.
[0031]
The magnetic head 29 faces the disk 1 exposed from the shutter opening of the cartridge 2. An optical head 30 is provided at a position facing the surface of the disk 1 opposite to the surface facing the magnetic head. The optical head 30 includes, for example, a laser light source such as a laser diode, an optical component such as a collimator lens, an objective lens, a polarizing beam splitter, and a cylindrical lens, and a photodetector. A laser beam having a constant power larger than that during reproduction is applied. Data is recorded on the disk 1 by thermomagnetic recording by this light irradiation and a modulated magnetic field by the magnetic head 29. The magnetic head 29 and the optical head 30 are both configured to be movable along the radial direction of the disk 1.
[0032]
At the time of recording, the output of the optical head 30 is supplied to the absolute address decoding circuit 34 via the RF signal processing circuit 31, and the absolute address code from the pregroove of the disk 1 is extracted and decoded. . Then, the decoded absolute address information is supplied to the recording encoding circuit 27, inserted as absolute address information in the recording data, and recorded on the disc. The absolute address information from the absolute address decoding circuit 34 is also supplied to the system control circuit 20 and is used for recording position recognition and position control as described above.
[0033]
Further, a signal from the RF signal processing circuit 31 is supplied to the servo control circuit 32, and a control signal for constant linear velocity servo of the motor 30M is formed from the signal from the pregroove of the disk 1, and the speed of the motor 30M is controlled. The
[0034]
[Reproducing system of recording / reproducing apparatus]
The disk loaded in the apparatus is rotationally driven by a disk drive motor 30M. In the same manner as at the time of recording, this disk drive motor 30M is driven by the servo control circuit 32 according to a signal from the pregroove, and the disk 1 is driven at the same speed as that at the time of recording, that is, a linear velocity of 1.2 to 1.4 m / s. Thus, the rotation speed is controlled to be constant.
[0035]
At the time of reproduction, the optical head 30 detects the focus error by the astigmatism method, for example, by detecting the reflected light of the laser light irradiated to the target track, and also detects the tracking error by the push-pull method, for example. A reproduction RF signal is output by detecting the difference in the polarization angle (Kerr rotation angle) of the reflected light from the target track.
[0036]
The output of the optical head 30 is supplied to the RF signal processing circuit 31. The RF signal processing circuit 31 extracts the focus error signal and tracking error signal from the output of the optical head 30 and supplies them to the servo control circuit 32, and also binarizes the reproduction signal and supplies it to the reproduction decoding circuit 33.
[0037]
The servo control circuit 32 performs focus control of the optical system of the optical head 30 so that the focus error signal becomes zero, and performs tracking control of the optical system of the optical head 30 so that the tracking error signal becomes zero. Do.
[0038]
Further, the RF signal processing circuit 31 extracts the absolute address code from the pre-probe and supplies it to the absolute address decoding circuit 34. Then, the absolute address information from the decoding circuit 34 is supplied to the system control circuit 20 and is used for reproducing position control of the optical head 30 in the disk radial direction by the servo control circuit 32. The system control circuit 20 can also use address information in units of sectors extracted from the reproduction data to manage the position on the recording track scanned by the optical head 30.
[0039]
During this reproduction, as will be described later, the compressed data read from the disk 1 is written into the buffer memory 25 and read and decompressed. However, due to the difference in transmission rate between the two data, the optical head from the disk 1 is read. Data reading by 30 is performed intermittently, for example, so that the data stored in the buffer memory does not fall below a predetermined amount.
[0040]
Data read from the disk 1 is supplied to the reproduction decoding circuit 33 via the RF signal processing circuit 31. The reproduction decoding circuit 33 receives the binarized reproduction signal from the RF signal processing circuit 31, and performs processing corresponding to the recording encoding circuit 27, that is, EFM decoding processing, decoding processing for error detection and correction, and interpolation processing. And so on. The output data of the reproduction decoding circuit 33 is supplied to the data decoding circuit 26P.
[0041]
The data decoding circuit 26P decodes the data of the sector structure of the CD-ROM into original data in a compressed state.
[0042]
The output data of the data decoding circuit 26P is transferred to the buffer memory 25 controlled by the track jump memory control circuit 24 and written at a predetermined writing speed.
[0043]
At the time of this reproduction, the memory control circuit 24 reads the compressed data from the data decoding circuit 26P at about the writing speed if there is no track jump in which the reproduction position jumps due to vibration or the like during reproduction. The data is sequentially read at a transfer rate of 1/5 times, and the read data is transferred to the data expansion processing circuit 23P. In this case, the memory control circuit 24 controls writing / reading of the buffer memory 25 so that the amount of data stored in the buffer memory 25 does not become a predetermined amount or less.
[0044]
When it is detected that a track jump has occurred during reproduction, data writing from the data decoding circuit 26P to the buffer memory 25 is stopped, and only data transfer to the data decompression processing circuit 23P is performed. Then, when the reproduction position is corrected, control is performed so that data writing from the data decoding circuit 26P to the buffer memory 25 is resumed.
[0045]
Whether or not a track jump has occurred is detected, for example, by a method using a vibrometer or a method using an absolute address code recorded on a pregroove of an optical disc superimposed on a wobbling signal for tracking control (as in recording). That is, a method of using the decode output of the absolute address decoding circuit 34) or a method of detecting the track jump by taking the OR of the vibration meter and the absolute address code can be used. Further, at the time of reproduction, as described above, absolute address information and sector unit address information are extracted from the reproduction data, and can be used.
[0046]
As can be understood from the above description, as the data capacity of the buffer memory 25 at the time of reproduction, data corresponding to the time from when a track jump occurs until the reproduction position is correctly corrected can always be accumulated. Minimum capacity is required. This is because if there is enough capacity, data can continue to be transferred from the buffer memory 25 to the data decompression circuit 23P even if a track jump occurs. The 1M bit as the capacity of the buffer memory 25 in this example is selected as a capacity having a margin so as to sufficiently satisfy the above condition.
[0047]
Further, as described above, the memory control circuit 24 performs memory control so that the predetermined data more than the necessary minimum is stored in the buffer memory 25 as much as possible during normal operation. In this case, for example, when the data amount of the buffer memory 25 becomes equal to or less than a predetermined amount, the data is intermittently taken in from the disk 1 by the optical head 30 and the data is written from the data decoding circuit 26P. And memory control is performed so as to always ensure a read space larger than a predetermined amount of data.
[0048]
In the data decompression processing circuit 23P, the ADPCM data is decompressed by about 5 times, contrary to the data compression processing at the time of recording. The digital audio data from the data decompression circuit 23P is supplied to the DA converter 35, returned to the 2-channel analog audio signal, and output from the pair of output terminals 36LT and 36RT.
[0049]
[Recorder marker recording operation]
Normally, when recording a plurality of songs, for example, when recording each song, a track number is set at the start of recording of each song, and the absolute address on the disc at the recording start position is set as TOC data. , Respectively. In this case, the track number is updated sequentially. In addition, when recording multiple songs in a single recording, it detects the silent section between songs and automatically updates the track number at the beginning of the song, and the disc at that position. The absolute address above is recorded as TOC data.
[0050]
As described above, normally, at the start of recording, a silent section between songs is detected, the track number is updated at the beginning of the song, and this track number is recorded in the TOC. The so-called cueing or the like is performed using the track number of the TOC as an index. However, setting a desired position in the middle of a song or a desired position has not been performed conventionally.
[0051]
In this example, in addition to the above TOC data, when the marker key Km is operated during the recording operation, the recording position at the time of the operation (absolute address on the disk 1, the same applies hereinafter), or the recording position before that, It is recorded in the TOC area of the disc 1 as a marker driving point. Then, the track number is updated at the operation time point.
[0052]
Next, a marker recording operation according to an embodiment of the present invention will be described with reference to FIG. 1 and the flowchart of FIG.
[0053]
First, prior to recording, the TOC memory 20m stores an address on the disc 1 at an arbitrary operation time to of the marker key Km, or a retroactive time tb (= to−) which is ΔT time before the operation time to. Whether to store the address of [Delta] T) is set according to the recording target (step S1).
[0054]
This retroactive time ΔT can be arbitrarily set in this example. As described above, for example, when recording a lecture, the retroactive time ΔT is, for example, about 1 to 2 seconds. Also, when recording what is known in advance, such as music, for example, the marker key may be operated during the song, for example, the retroactive time ΔT = 0 and the operation time t0 of the marker key Km is set to Can be remembered.
[0055]
Next, in step S2, a key operation input from the key operation unit 41 is awaited. If there is a key operation input, the process proceeds from step S2 to step S3 to determine whether or not the operated key is the recording key Kr. If the operated key is not the recording key Kr, the processing routine corresponding to the operation key is performed. move on. If the operated key is the recording key Kr, the apparatus enters a recording standby state (step S4).
[0056]
Next, in step S5, the key operation input is waited for in the key operation unit 41. If there is a key operation input, the process proceeds from step S5 to step S6, and it is determined whether or not the operated key is the start (reproduction) key Kp. Is done. If the operated key is not the reproduction key Kp, the process proceeds to a processing routine corresponding to the operation key. If the operated key is the reproduction key Kp, recording is started and the target audio is recorded as usual. Is recorded in the memory 20m (step S7).
[0057]
In this embodiment, during the recording operation, the apparatus waits for a key operation of the key operation unit 41 (step S8). If there is a key operation, it is determined whether or not the key operation is an operation of the marker key Km ( Step S9). If the key operation is an operation of the marker key Km, the process proceeds from step S9 to step S10, and the address at the operation time point t0 is stored in the TOC memory 20m.
[0058]
After step S10, the process proceeds to step S11. In step S11, for example, it is determined whether or not the marker key Km has been operated continuously for a predetermined time Tc of 1 to 2 seconds.
[0059]
If the continuous operation time is less than Tc, it is regarded as an erroneous operation of the marker key Km, the process proceeds from step S11 to step S12, and the address of the key operation time point t0 stored in the TOC memory 20m is deleted in step S10 described above. The After step S12, the process returns to step S8.
[0060]
On the other hand, when the continuous operation time of the marker key Km is Tc or more, the process proceeds from step S11 to step S13, and the address of the marker point is calculated. That is, when the condition set according to the recording target in the above-described step S1 is ΔT ≠ 0, the microcomputer 20 calculates the retroactive time point tb that is ΔT time before the operation time point t0 of the marker key Km. An address corresponding to tb is calculated. When ΔT = 0, the address at the marker key operation time point t0 is used as the address at the time point tb.
[0061]
After step S13, the process proceeds to step S14 where the track number is incremented by 1 as the contents of the TOC memory 20m and updated, and the address of the marker point at the time tb is stored as the start address. That is, the track number is updated and the start address is stored at the operation point of the marker key Km other than the beginning of the music or the recording start point.
[0062]
After step S14, the process returns to step S8, and the series of operations in steps S9 to S14 by the operation of the marker key Km as described above is repeated cyclically until the stop key Ks is operated in the subsequent step S16. It is.
[0063]
When it is determined in step S9 that the operation is not the marker key Km, the process proceeds from step S9 to step 15 where it is determined whether or not the operation is a pause (pause) key, and when it is determined that the operation is the pause key. Returning to step S4, the recording standby state is entered.
[0064]
When it is determined in step S15 that the operation is not the pause key operation, the process proceeds from step S15 to step S16, and it is determined whether or not the operation key is the stop key Ks. When it is determined that the stop key Ks has not been operated, the key operation is ignored as an erroneous operation, and the process returns from step S16 to step S8. When the stop key Ks is operated, the process proceeds from step S16 to step S17, the recording operation is completed, and the TOC data including the address of the marker point time tb stored in the memory 20m is stored in the TOC area on the disc. And the recording operation of the apparatus is completed.
[0065]
Therefore, at the time of reproducing the disc, a desired marker point can be quickly detected based on each address written in the TOC area as described above.
[0066]
In the above-described embodiment, the marker key Km is provided independently, but other operation keys, for example, the recording key Kr can also be used as the marker key Km without being provided independently.
[0067]
The above is a case where the present invention is applied to a disk apparatus that compresses audio data and intermittently records / reproduces the data. However, according to the present invention, address data is recorded in advance on a disk, and the TOC Any disk device having a specification for recording data related to recording data, such as a directory or a directory, can be applied.
[0068]
A time code can also be used as absolute address data on the disk.
[0069]
【The invention's effect】
As described above, according to the present invention, in the disk recording apparatus using the disk in which the address data is recorded in advance and the TOC (information about the recording data) is written in the predetermined area, the recording is performed during the recording operation. When the key is operated, the address on the disk corresponding to this key operation time is written in the predetermined area as the TOC, so that the position information for search that does not substantially deviate from the marker point on the disk can be obtained. Can be generated.
[0070]
At the time of reproduction, since this TOC is read prior to actual reproduction, a desired marker point is quickly detected based on the position information of this TOC data.
[Brief description of the drawings]
FIG. 1 is a diagram showing a part of a flowchart for explaining the operation of a disk recording apparatus according to the present invention.
FIG. 2 is a diagram showing a part of a flowchart for explaining the operation of the disk recording apparatus according to the present invention;
FIG. 3 is a block diagram showing a configuration example of an embodiment of the present invention.
[Explanation of symbols]
20 ... System control circuit (microcomputer), 20m ... Memory for TOC, Km ... Marker key, Kr ... Recording key

Claims (4)

A disk recording device for marking a position during recording on a disk and writing the position in a predetermined area on the disk for later retrieval,
Means for identifying, as a first address, an address corresponding to the information position on the disc when a predetermined key is operated during recording;
Means for identifying a second address related to the first address by a retroactive time, and writing the identified second address to a predetermined area of the disc;
Means for setting the retroactive time;
A disk recording apparatus comprising: 2. The disk recording apparatus according to claim 1, wherein the retroactive time can be arbitrarily set. In a disk recording apparatus that uses a magneto-optical disk in which address data is recorded in advance, and information related to the recording data is recorded in a predetermined area of the magneto-optical disk,
Marker key and
Means for writing an address on the magneto-optical disk according to a position where the marker key is operated during a recording operation in the predetermined area;
Means for generating position information for data retrieval from the marker point on the magneto-optical disk substantially without offset;
Means for reading the address of the predetermined area to search for the marker point based on the position information;
A disk recording apparatus comprising: The disk recording apparatus according to claim 3, wherein
An address according to the operation point of the marker key is held in a temporary memory, and after the recording process is completed, the address held in the temporary memory is written in the predetermined area.

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