JPH06231538A - Disk recorder/reproducer - Google Patents

Abstract

PURPOSE:To record an audio signal from a time point before a record key is pressed by efficiently utilizing a buffer memory. CONSTITUTION:After audio data is compressed, it is once written in a buffer memory 35, then read, and recorded on a disk. At the time of reproducing, data output from the disk is once written in the memory 35. The data read from the memory 35 is expanded, and the audio data is reproduced. At the time point before entering a record mode, a writing is so controlled as to always write input audio data in the buffer 35 before a time responsive to a capacity of the buffer 35 from a present time point. When a start command of an actual record mode is generated, the audio data is read from the memory 35 of the previous data at a timing from the time point of the command, and recorded on a disk 1B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc recording / reproducing apparatus for recording / reproducing audio data.

[0002]

2. Description of the Related Art Generally, an audio signal recorder (for example, a tape recorder) does not start actual recording without a time delay from a recording start command such as pressing a recording key, but starts up a mechanical portion of the recorder. Since a predetermined time is required until the switching to the recording operation mode is completed, the actual recording starts from the time point delayed by the predetermined time. For this reason, the audio signal for this delay time cannot be recorded on the recording medium, and a so-called truncated state occurs.

Further, as a tape recorder for recording a conference as disclosed in, for example, Japanese Patent Laid-Open No. Sho 60-195753, a recording in which the recording operation is paused when unvoiced and the recording operation is performed only when voiced. However, in the case of this recorder, due to the time delay from the detection of the point of change from unvoiced to voiced until the actual start of recording, a state in which the so-called beginning of the conversation cannot be recorded occurs.

In order to avoid such a drawback, the time until the actual start of recording is obtained in advance, and a FIFO memory having a capacity for the margin time until the start of recording is provided in particular, and this memory is always provided with the above-mentioned information. A technique has been proposed in which audio data for a margin time is stored and the audio data passed through this memory is used as actual recording data (see Japanese Patent Laid-Open No. 58-41453).

[0005]

However, in the above-mentioned technique, the FIFO memory for preventing the head loss must be provided separately, which is expensive and requires a space for providing this memory, resulting in a large apparatus. There is a drawback that becomes.

[0006] When the user performs a so-called air check for recording a radio broadcast on a tape or other recording medium, he or she generally presses a record key while listening to the broadcast. It is often the case that the person should understand that the contents should be recorded after listening to.

However, since the portion to be recorded is an event that precedes in time, it is generally impossible to record. In order to record the previous portion in terms of time, it is necessary to provide a relatively large capacity FIFO memory and always store audio data for a predetermined period of time. However, in the conventional technology, such a thing is not taken into consideration, and the capacity of the memory of the FIFO only considers the time delay due to a mechanical factor from the recording start command to the actual start of recording. is there. For this reason, the conventional recording machine cannot meet the above demands. Moreover, a large amount of memory is more expensive and
Due to its large size, it was not practical to install it separately.

It is an object of the present invention to provide a disc recording / reproducing apparatus which eliminates the above-mentioned drawbacks.

[0009]

In order to solve the above problems, according to the present invention, after audio data is compressed, it is once written in a buffer memory and sequentially read from the previously written data from this memory, and Is a disc recording / reproducing apparatus for reproducing the audio data by writing the data extracted from the disc to the buffer memory, writing the data to the buffer memory once, sequentially reading the previously written data from the buffer memory, and decompressing the data. Then, at the time before entering the recording mode, the buffer memory is write-controlled so that the input audio data before the time corresponding to the capacity of the buffer memory from the present time is always written in the buffer memory, and the actual writing is performed. When there is a recording mode start command, Than decree time to provide a disk recording and reproducing apparatus that records read audio data to the disk from the buffer memory from the temporally previous data.

[0010]

According to the present invention having the above-described structure, at the time of recording, recording can be performed from the data which is written in the buffer memory before the recording is started. That is, it is possible to record data before the start of recording. Moreover,
During playback, the buffer memory can read ahead from the disc by that amount, so even if the scanning position of the pickup jumps to the wrong position due to vibration, etc., it will continue to read from the buffer memory and play without skipping. can do.

That is, the buffer memory used in the present invention is a buffer memory for preventing skipping during reproduction.
Since it is not only for recording the preceding data at the time of recording, the utilization efficiency is good. It should be noted that this buffer memory can be used as a buffer until the pickup position is returned to the correct position even after recording after the steady recording mode is entered, even when the pickup position is incorrect.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, before describing the present invention, a recording / reproducing apparatus to which the present invention is applied will be described.

[Description of Configuration of Recording / Reproducing Apparatus] FIG. 1 shows the configuration of an optical disk recording / reproducing apparatus to which the present invention is applied. In FIG. 1, reference numeral 1 is a disk cartridge. The disc cartridge 1 is configured by accommodating an optical disc 1B having a diameter of 64 mm in a cartridge body 1A. The optical disc 1B includes a read-only optical disc, a recordable magneto-optical disc, and a hybrid disc in which a read-only area and a recordable area are mixed.
There are different types. In the following description of the embodiment, the case where the optical disk 1B is a magneto-optical disk will be described as an example.

A spiral pre-groove for tracking control of a light beam is previously formed on the optical disc 1B. Particularly in this example, the pre-groove is FM-modulated based on absolute address data and recorded. Has been done. Therefore, the pre-groove of the optical disc 1B is
The optical disk 1B meanders in the radial direction based on the absolute address data.

The optical disk 1B is rotated by the spindle motor 2. The rotation of the spindle motor 2 is controlled by the servo control circuit 5 so that the disk 1B rotates at a constant linear velocity. A shutter is provided in the cartridge body 1A, and when the disc cartridge 1 is placed on the disc mounting tray and loaded in the apparatus, the shutter is opened, and the optical disc 1B is opened from the opening of the cartridge body 1A to the outside. It will be in a state to face. Further, when the disc cartridge 1 is ejected from the apparatus, the shutter moves to a position that closes the opening of the cartridge body 1A. And disk 1
A magnetic head 3 for recording is provided above the shutter opening of B.
Are opposed to each other, and the optical pickup 4 is opposed to the lower part of the shutter opening of the cartridge body 1A.

The movement of the optical pickup 4 is controlled by the feed motor 6 in the radial direction of the disc 1B. Further, the servo control circuit 5 performs focus control and tracking control of the optical pickup 4.

The system controller 20 is constructed by mounting a microcomputer and manages the entire operation. A key input signal is applied to the system controller 20 from the key group 10. This key group 10
2 shows the front panel surface of the recording / reproducing apparatus of this example, as shown in FIG. 2, a power key 11, an eject key 12, a reproducing key 13, a pause key 14, a stop key 15, a recording key 16, and a fast-forward reproducing key 17. In addition to the rewinding reproduction key 18, a preceding recording key 19 described later and the like are provided.

The advance recording key 19 is for setting whether or not recording is to be performed from a time point before the operation of the recording key 16 (this recording mode is hereinafter referred to as advance recording). When the key 19 is pressed, the apparatus shifts to the preceding recording mode. The pre-recording mode is used when the audio data is actually recorded on the optical disc 1B when the recording key 1 is used.
6 is a mode in which recording is performed from a time point before the time point 6 is operated, and the preceding record key 1 is operated before the operation of the record key 16.
It is set by operating 9 in advance.

The front panel surface of the recording / reproducing apparatus shown in FIG. 2 is provided with a variable input section 50 for setting a preceding recording time for setting a preceding recording time in the preceding recording mode. In this example, the variable input unit 50 uses a slide volume 50 as shown in FIG. 2, and the slide knob 50a of the slide volume is operated to move the position to set the preceding recording time. ,
The set preceding recording time is supplied to the system controller 20 described later as a value obtained by A / D converting the resistance value of the slide volume. Therefore, an A / D converter may be provided between the variable input section 50 and the system controller 20 as needed.
A converter is arranged to A / D-convert the resistance value of the slide volume. System controller 20 is A / D
In the case of a microcomputer having a built-in converter, the A / D converter connected between the variable input section 50 and the system controller 20 is omitted.

The information on the preceding recording time set by the variable input section 50 is stored in the built-in memory of the system controller 20. When the capacity of the buffer memory 35, which will be described later, is 4 Mbytes, it is possible to record the audio signal up to 10 seconds before the present time, and the preceding recording time that can be set by the variable input unit 50, that is, how many seconds ago can be traced back Whether to record the input audio signal can be arbitrarily set within a range of 0 to 10 seconds.

The system controller 20 is composed of a microcomputer. System controller 2
0 generates a control signal based on the operated key in the key group 10 and supplies the generated control signal to each unit of the recording / reproducing apparatus to manage and control the operation of the recording / reproducing apparatus.

The system controller 20 is also connected to a display 30 which is, for example, an LCD or a fluorescent display tube. On this display 30, the total playing time of the loaded optical disk 1B, the elapsed time of the music being played,
Time information such as the remaining playing time of the song being played, the remaining playing time of the entire song, and the track number of the playing song are displayed. In addition, the disc name and the track name are displayed on the disc on which the disc name and the track name are recorded. Furthermore, if the recording date and time of the song or disc is recorded, the recording date and time is displayed.

The structure of the recording / reproducing signal system of the embodiment shown in FIG.
It is devised so that the structure can be simplified as much as possible by using an IC. It should be noted that, during recording and during reproduction, the mode of each unit is switched by a mode switching signal from the system controller 20.

[Description of recording system] 31 is an audio signal (1 channel for simplification in the figure, but it is actually 2 channels).
It is a channel stereo. The same applies hereinafter). The audio signal from the input terminal 31 is A /
In the D converter 32, the sampling frequency 44.
It is digitized at 1 kHz and a quantization bit number of 16 bits.

This digital audio signal is supplied to the audio compression encoding / decoding circuit 33. In the audio compression encoding / decoding circuit 33, the audio signal is data compressed to about 1/5. In this case, as a compression technique for audio signals, for example, modified DCT (Modified Dict.
screate Cosine Transform) is used.

The audio signal compressed by the audio compression encoding / decoding circuit 33 is stored in the memory controller 34.
Is stored once in the buffer memory 35 controlled by the memory controller 34 via. In the case of this example, the buffer memory 35 has a data capacity of 4M.
A bit DRAM is used.

The memory controller 34 uses the buffer memory 3 unless a track jump that causes the recording position on the optical disk 1B to jump due to vibration or the like occurs during the recording operation.
5, the compressed data is sequentially read at a transfer speed of about 5 times the write speed, and the read data is transferred to the sector-structure data encode / decode circuit 36.

When it is detected that a track jump has occurred during recording, the memory controller 34 stops the data transfer to the data encoding / decoding circuit 36 and the compressed data from the audio compression encoding / decoding circuit 33. Are stored in the buffer memory 35. After that, when the irradiation position of the light beam emitted from the optical pickup 4, that is, the recording position is corrected, the buffer memory 3
The memory controller 34 controls writing and reading of the memory 35 so as to restart the data transfer from 5 to the data encoding / decoding circuit 36.

Whether or not a track jump has occurred can be detected, for example, by providing a vibrometer in the recording / reproducing apparatus and detecting whether or not the magnitude of vibration is such that a track jump occurs. . Further, as described above, since the absolute address data is recorded in the pre-groove on the disk 1B of this example, the absolute address data is read at the time of recording, and the system controller 20 confirms the continuity of the decoded address data. Tracking can also detect track jumps. Alternatively, the track jump may be detected by taking the OR (logical sum) of the vibrometer and the absolute address data. When a track jump occurs, the system controller 20 controls the optical pickup 4 so that the power of the light beam from the optical pickup 4 for magneto-optical recording is lowered to a level at which recording is not possible or the power is zero. It is something.

Then, the correction of the recording position when the track jump occurs is performed by using the absolute address data. Further, as understood from the above, the data capacity of the buffer memory 35 in this case is a capacity capable of accumulating compressed data corresponding to the time from the occurrence of the track jump to the correct correction of the recording position. Is the minimum requirement. In this example, the buffer memory 35 has a capacity of 4 Mbits as described above, and this storage capacity is selected with a margin so as to sufficiently satisfy the above conditions.

Further, in this case, the memory controller 34
During this recording, during normal operation, memory control is performed so that the data stored in the buffer memory 35 is as small as possible. That is, when the data amount of the buffer memory 35 becomes equal to or more than a predetermined amount, a predetermined amount of data, for example, 32 sectors (1 sector corresponds to 1CD-
Only the data of the ROM sector (which is about 2 Kbytes) is read from the buffer memory 35, and the memory control is performed so as to always secure the write space of a predetermined data amount or more.

The data encoding / decoding circuit 36 is
The data read from the buffer memory 35 is recorded on the CD-R.
Encode into OM sector structure data. As will be described later, recording / reproduction of audio data is performed in units of 32 sectors worth of audio data (about 2 seconds of the original analog audio signal, but about 0.4 seconds is equivalent to data compression). It is something to do. The audio data for 32 sectors is hereinafter referred to as a cluster.

The output data of the data encode / decode circuit 36 is supplied to the EFM and CIRC encode / decode circuit 37. In this circuit 37, data is subjected to error detection / correction coding processing and modulation processing suitable for recording, in this example, EFM (8-14 modulation) processing. In this example, as the code for error detection and correction, a code obtained by changing interleaving with respect to CIRC (Cross Interleave Reed-Solomon Code) of a compact disc is used. The recorded data is intermittent data, and a total of 4 sectors (hereinafter referred to as linking sectors) for cluster connection (including 1 sector of sub data) are provided before and after 32 sectors of audio data as one cluster. It is added to form unit recording data consisting of 36 sectors.

The recording data thus formed is
It is supplied to the recording magnetic head 3 via the head drive circuit 38. As a result, the magnetic field modulated by the recording data is applied to the disc 1B (magneto-optical disc).

Further, the disc 1B is irradiated with the laser beam from the optical pickup 4. At the time of this recording, the recording track is irradiated with laser light having a constant power larger than that at the time of reproduction. By this light irradiation and the modulation magnetic field by the magnetic head 3, data is recorded on the disk 1B by thermomagnetic recording. Thus, about 2 seconds (1 cluster) of data of the original audio signal is recorded on the disc 1B in about 0.4 seconds.

The magnetic head 3 and the optical pickup 4 are constructed so as to be movable in the radial direction of the disk 1 in synchronization with each other.

Reference numeral 39 is an RF amplifier to which a detection output signal from the photodetector of the optical pickup 4 is supplied. The RF amplifier 39 generates an RF signal as a reproduction signal of the optical disc 1B based on the output signal from the photodetector of the optical pickup 4. When the optical disc 1B is a magneto-optical disc, based on the difference in the Kerr rotation angle of the light beam reflected by the recording film of the optical disc 1B,
The RF signal is output from the RF amplifier 39. This RF signal is an EFM and CIRC encoding / decoding circuit 37.
Is supplied to.

The RF amplifier 39 produces a focus error signal from the output signal of the photodetector based on the so-called astigmatism method. The RF amplifier 39 also generates a tracking error signal from the detection output of the photodetector by the so-called 3-spot method. Further, the RF amplifier 39 generates a signal in which a pre-groove is detected by a so-called push-pull method, that is, a push-pull signal, and supplies it to an address decoder 40 described later.

The generated focus error signal and tracking error signal are supplied to the servo control circuit 5, as described above. The RF amplifier 39 extracts a clock component from the generated RF signal and supplies it to the servo control circuit 5. The servo control circuit 5 compares this clock component with a reference clock to generate a spindle servo signal, and supplies this spindle servo signal to the spindle motor 2. As a result, the spindle motor 2 is controlled so as to rotate the disk at a constant linear velocity.

The address decoder 40 generates address data by FM demodulating the push-pull signal supplied thereto. The address data demodulated by the address decoder 40 is supplied to the EFM and CIRC encoding / decoding circuit 37 and is decoded. The decoded address information is supplied to the system controller 20 and used for recognition of the recording position of this recording and position control. The address information is used for recognition of the reproduction position and position control even during reproduction.

At the time of this recording, the address data decoded by the EFM and CIRC encoding / decoding circuit 37 is inserted into the recording data and recorded on the disc.

[Description of Playback System] Next, the playback will be described. That is, during this reproduction, the spindle motor 2 is controlled by the servo control circuit 5 in the same manner as during recording.
The signal from the pre-groove controls the rotation speed of the disk 1 at the same constant linear velocity as during recording.

At the time of reproduction, the optical pickup 4 detects the focus error by the astigmatism method by detecting the reflected light of the laser beam applied to the target track as described above, and tracking by the push-pull method. In addition to detecting an error, a difference in polarization angle (Kerr rotation angle) of the reflected light from the target track is detected, and a reproduction RF signal is output.

The output of the optical pickup 4 is the RF amplifier 3
9 is supplied. The RF amplifier 39 is the optical pickup 4
The focus error signal and the tracking error signal are extracted from the output of the above and supplied to the servo control circuit 5, and the reproduced signal is binarized and supplied to the EFM and CIRC encode / decode circuit 37.

The servo control circuit 5 controls the focus of the optical system of the optical pickup 4 so that the focus error signal becomes zero, and the servo control circuit 5 controls the optical system of the optical pickup 4 so that the tracking error signal becomes zero. Performs tracking control.

The output of the RF amplifier 39 is also supplied to the address decoder 40, which extracts and decodes absolute address data from the pregroove. Then, the absolute address data from the decoder 40 is supplied to the system control circuit 20 via the circuit 37 and used for the servo control circuit 5 to control the reproduction position of the optical pickup 4 in the disc radial direction. In addition, the system control circuit 20
The sector unit address information extracted from the reproduction data can also be used to manage the position on the recording track being scanned by the optical pickup 4.

During this reproduction, as will be described later, the disc 1
The compressed data read from B is written in the buffer memory 35, read and expanded, but due to the difference in the transmission rate of both data, the data read by the optical pickup 4 from the disk 1B is performed by the buffer memory 3, for example.
It is performed intermittently so that the data stored in 5 does not fall below a predetermined amount.

In the EFM and CIRC encoding / decoding circuit 37, the signal supplied via the RF amplifier 39 is EFM demodulated and subjected to error correction processing. The output of the EFM / CIRC encode / decode circuit 37 is supplied to a sector-structure data encode / decode circuit 36 to decompress the sector structure of the CD-ROM and decode the data into original data in a compressed state.

The output of the data encode / decode circuit 36 is temporarily stored in the buffer memory 35 via the memory controller 34. And the memory controller 3
No. 4 is for sequentially compressing the data in the compressed state from the data encoding / decoding circuit 36 at a transfer speed which is about 1/5 of the writing speed unless a track jump in which the reproduction position jumps due to vibration during reproduction occurs. The read-out data is read out, and the read-out data is read by the audio compression encoding / decoding circuit 33.
Transfer to. In this case, the memory controller 34 controls the write and read operations of the buffer memory 35 so that the amount of data stored in the buffer memory 35 does not fall below a predetermined level.

When it is detected that a track jump has occurred during reproduction, the memory controller 34 stops writing data from the data encode / decode circuit 36 to the buffer memory 35, and the audio compression encode / decode circuit. Only data transfer to 33 is performed. Then, when the irradiation position of the light beam emitted from the optical pickup 4, that is, the reproduction position is corrected, the memory controller 34 restarts the data writing from the data encoding / decoding circuit 36 to the buffer memory 35. The writing and reading of the memory 35 are controlled.

Further, as described above, the memory controller 34 performs memory control so that predetermined buffer data more than the required minimum is stored in the buffer memory 35 as much as possible during a normal reproducing operation. For example, the buffer memory 35
When the data amount of the data is less than a predetermined amount, a control signal is sent to the system controller 20 to intermittently capture the data from the disc 1B by the optical pickup 4, and the data encoding / decoding circuit 36 Data is written, and memory control is performed so that data of a predetermined amount or more is always secured in the memory.

The time required to read the data into the buffer memory 35 is about 0.9 seconds, which corresponds to an analog audio signal for about 3 seconds.
That is, when the buffer memory 35 is full of data and the signal of the disk 1B cannot be read, the reproduction signal can be continuously output for about 3 seconds. By re-accessing the optical pickup to its original position and reading the signal again during that time, the occurrence of sound skip can be prevented.

The digital data decompressed by the audio compression encoding / decoding circuit 33 is the D / A converter 4
1 and is converted back to an analog signal. This analog signal is output from the output terminal 42.

In the recording / reproducing apparatus of the example of FIG. 1 configured as described above, when the recording key 16 is pressed in the recording mode, recording of the audio signal after the operation time of the recording key 16 is recorded on the optical disc 1B. There are a normal recording mode in which the audio signal is recorded and a preceding recording mode in which the audio signal is recorded from a time point before the time set by the variable input section 50 when the record key 16 is pressed. . To enter the advance recording mode, advance recording key 19
Is operated to shift.

[Normal recording mode] When the recording key 16 is pressed without operating the preceding recording key 19, the normal recording mode is entered. In this normal recording mode, when the recording key 16 is pressed, the buffer memory 3
5 is refreshed, the analog audio signal input from the A / D converter 32 from this point is digitally converted, the data is compressed by the audio compression encoding / decoding circuit 33, and sequentially stored in the buffer memory 35 via the memory controller 34. Accumulated.

Then, as described above, by the memory control according to the memory controller 34, cluster units are sequentially read from the buffer memory 35 to form a sector structure, and EFM and error correction coding processing is performed. Then, it is recorded on the disc 1B.

[Preceding Recording Mode] As described above, this mode is entered by pressing the preceding recording key 19 prior to the operation of the recording key 16. When the advance recording key 19 is pressed, the recording / reproducing apparatus causes the routine 10 shown in FIG.
Enter 0. That is, the buffer memory 35 is refreshed (step 101), and thereafter, the compressed audio data from the audio compression encoding / decoding circuit 33 is
The data is sequentially written in the buffer memory 35 (step 102).

At this time, in the buffer memory 35, a memory area excluding a part of the memory area (for the idle area and other data) is used as the preceding data writing area, and the preceding data writing area is a so-called ring. It works as a buffer. 4A-C
Is a diagram schematically showing the writing and reading memory control of the buffer memory 35 in the preceding recording mode,
4A to 4C, the storage area of the buffer memory 35 is shown as a ring shape.

When the advance recording key 19 is pressed, writing of compressed audio data to the buffer memory 35 is started as shown in FIG. 4A. In FIG. 4, a hatched portion indicates a memory area in which data is written. Then, when the compressed audio data is sequentially written to the buffer memory 35 and the preceding write area becomes full, new data is overwritten from the oldest data as shown in FIG. 4B. .

In this way, the buffer memory 35 is written so that the compressed audio data from the current time point up to the preceding write area is always stored. The writing of the compressed data to the preceding writing area of the buffer memory 35 as the ring buffer is continued until the recording key 16 is pressed. When the recording key 16 is pressed thereafter, the preceding data for the subsequent switching to the normal mode is recorded on the optical disc 1B, and then the normal recording mode is entered.

That is, in this state, the recording key 1
6 is pressed, and when this is detected in step 103 of the routine 100 of FIG. 3, the process proceeds to step 104, and the slide recording volume as the variable setting unit 50 is preset for the preceding recording time tb at the present time. Reading from the buffer memory 35 is started from the data before this (see FIGS. 4C and 5).

At this time, the read timing from the buffer memory 35 is that the data is compressed, so the input audio data is compressed and the memory 3 is read.
This can be performed at a higher speed than the time required to write data in No. 5. As a result, the data is read from the memory 35 while continuing to write the compressed data to the buffer memory 35. Then, by the control of the buffer memory 35 as described above by the memory controller 34, data in units of clusters is read from the buffer memory 35 at high speed until the amount of data stored in the buffer memory 35 reaches the above-mentioned predetermined value. Continue to be issued.

Then, the process proceeds to step 105, and the data for a plurality of clusters at that time is recorded on the disk 1B in a relatively short time. For example, one cluster is approximately 0.
Since data can be recorded on the disc in 4 seconds, data of 4 to 5 clusters can be recorded in about 2 seconds. After that, the routine proceeds to the same recording routine as the normal recording.

As described above, since the buffer memory 35 is used as a ring buffer and the compressed audio data before the time (current time) when the recording key is pressed is always accumulated by the amount corresponding to the memory capacity, It is possible to record from the accumulated data before the time. Therefore, since it is always possible to record from the time before pressing the record key, so-called head breakage does not occur at all, and further, for example, at the time of air check,
Even if the recording key is operated after recognizing the listening content, the target broadcast content before the operation of the recording key 16 can be surely recorded. Moreover, the time before pressing the record key for preceding recording can be arbitrarily set, which is very convenient.

In the recording / reproducing apparatus of the example of FIG. 1, the buffer memory 35 is used for normal recording and reproduction.
Since it originally existed as a time compensation for returning to the correct pickup position when the pickup position flies due to vibration etc., a separate memory for always storing the data before pressing the record key is separately provided. There is no need to provide it. Therefore, even if the function of the present invention is added to the device, the cost of the device can be prevented from increasing, and the space for a separate memory is not required, so that the device does not become large.

In the above example, the buffer memory 35
Is used as a ring buffer and the start timing when accumulating data for a predetermined time before pressing the record key is
The advance recording key 19 is used, but the start timing may be to start writing the data to the buffer memory 35 immediately after the power switch 11 is turned on. In this case, it is not necessary to intentionally provide the preceding recording key 19. Then, in order to set the normal recording mode,
The time period for preceding recording may be set to 0 second by the slide volume 50.

The variable input section 5 for setting the lead time
0 may be a rotary type volume instead of a slide volume. Further, instead of these variable volumes, a plurality of numeric keys may be provided and the value input by the numeric keys may be supplied to the system controller 20 to set the preceding recording time. The preceding recording time can be set by various other methods.

[0068]

As described above, according to the present invention, the buffer memory for compensating for sound skips at the time of reproduction is used as the data storage for the preceding recording at the time of recording and before the recording key is pressed. It is possible to realize a recording / reproducing apparatus that can always record from a point in time. Since the buffer memory is also used for compensating for skipping during playback, it has a relatively large capacity,
Therefore, the preceding data amount before the recordable recording key is pressed, that is, the preceding time can be taken relatively long. Therefore, for example, immediately after the broadcast content is surely recognized, the recognized portion can be recorded, which is more convenient.

Further, according to the present invention, since the preceding recording time can be arbitrarily set within the range of the capacity of the buffer memory, it is possible to set the corresponding time according to the application of the preceding recording, which is convenient. Good.

Further, since the buffer memory for data storage for preceding recording is also used for compensation of sound skips during normal recording and reproduction, the memory can be used efficiently, and an extra memory can be used as a recording / reproducing apparatus. Is unnecessary, the cost of the device is reduced, and it is useful for downsizing.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a disc recording / reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing an example of a front panel surface of an embodiment of a disc recording / reproducing apparatus according to the present invention.

FIG. 3 is a flowchart of an example of a main part of the present invention.

FIG. 4 is a diagram for explaining write / read control of a buffer memory used in the present invention.

FIG. 5 is a diagram for explaining a recording operation of the disc recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

 10 key group 16 recording key 19 preceding recording key 20 system controller 32 A / D converter 33 audio compression encoding / decoding circuit 34 memory controller 35 buffer memory 50 slide volume for setting preceding recording time

Claims (2)

[Claims] 1. After data compression of audio data,
Once written in the buffer memory, sequentially read from the data previously written from this memory, and recorded on the disk, and at the same time, write the data taken out from the disk to the buffer memory once, and then to the buffer memory first. A disc recording / reproducing apparatus for sequentially reading out from written data, decompressing the data, and reproducing audio data, which corresponds to the capacity of the buffer memory from the present time before the recording mode is entered. Always write the input audio data before time,
The buffer memory is write-controlled, and when there is a start command for the actual recording mode, audio data is read from the buffer memory from the data temporally before the command time and recorded on the disc. Disk recording / playback device. 2. A data time point before the start command for starting reading from the buffer memory when a start command for the actual recording mode is issued can be set in advance, and the time point is variable. The disc recording / reproducing apparatus according to claim 1, wherein the disc recording / reproducing apparatus is configured to be able to perform.