JPH11120689A - Recording and reproducing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording/reproducing system capable of executing high- speed recording and reproduction without increasing the reproducing rate of a recording/reproducing drive. SOLUTION: A recording source control section 108 is provided to control the data output rate for a recording source 102 in accordance with the remainder of data of a data buffer 104. By this, the data recording rate of the recording drive 105 is maintained at a maximum value and the writing rate of a voice compressing section 103 and the data output rate of the recording source 102 are maintained to be always equal to the data recording rate of the recording drive 105. As the data remainder of the data buffer grows greater than a specified value, the transfer rate of the recording source is made to fall, and conversely when the data remainder is becomes smaller than the specified value, the transfer rate of the recording source is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing system and, more particularly, to a PCM using a mini-disc or the like as a recording medium.
The present invention relates to a recording / reproducing system for handling data, and further relates to a recording / reproducing system for transferring data between a main recording / reproducing device and a sub-recording / reproducing device for recording / reproducing.

[0002]

2. Description of the Related Art As a general method for transmitting a digital signal obtained by A / D conversion (analog-digital conversion) of an analog signal such as voice, PCM (Puls
e Code Modulation) is widespread. The PCM data, which is digital data obtained by this method, is compression-encoded (encoded) and recorded (recorded) on a recording medium such as a compact disk (CD) or an optical disk, and is decompressed and decoded (decoded) during reproduction. Will be used. Also, recording media have been developed in various directions, such as higher density and larger capacity, and smaller and lighter. Above all, a minidisk (MD), which is a magneto-optical disk having a diameter of 64 mm, is a recording medium that has recently become widespread mainly for recording audio data, and a recording / reproducing apparatus using this is also becoming more sophisticated and multifunctional. It is skewed.

[0003] Hereinafter, as an example of a recording / reproducing system for recording and reproducing using a mini-disc according to the prior art, an apparatus having a function of preventing interruption of recording / reproducing by providing a buffer memory will be described. I do. FIG. 5 is a block diagram showing the configuration of a recording / reproducing system using such a conventional mini-disc device.

[0005] In FIG. 5, reference numeral 501 denotes a mini disk device which is a main recording / reproducing device.
6 for recording / reproducing PCM data to / from a mini disc. Reference numeral 502 denotes a recording source, which supplies PCM data to the mini disk device 501. As the recording source 502, for example, a CD player or the like can be used. Reference numeral 503 denotes an audio compression / expansion unit. In the recording mode, the audio data supplied from the recording source 502 is compressed and output to the data buffer 504. In the reproduction mode, the compressed data is read and expanded from the data buffer 504. . A data buffer 504 temporarily stores the compressed data. A recording / reproducing drive 505 performs recording / reproducing on / from a mini disc. 5
Reference numeral 06 denotes a recording / reproduction drive control unit, which controls the recording / reproduction drive 505 according to the data amount of the data buffer. Specifically, it monitors the remaining amount of data in the data buffer 504, instructs a recording / reproduction drive to perform a recording operation when the remaining amount of data becomes a predetermined value or more in the recording mode, and sets the remaining amount of data to the predetermined value in the reproduction mode. In the following cases, the reproducing operation is instructed to the recording / reproducing drive. Reference numeral 507 denotes a system control unit which controls the audio compression / expansion unit 503, the recording / reproduction drive 505, and the recording / reproduction drive control unit 506.
An operation in the recording mode or the reproduction mode is instructed.

FIG. 6 is a timing chart showing the operation of the conventional recording / reproducing apparatus. The operation of the conventional recording / reproducing apparatus during recording (R) and reproduction (P) will be described below with reference to FIG.
This will be described with reference to FIG.

[0006] R. Recording FIG. 6A shows the operation in the recording mode. In FIG. 6A, the data amount indicates the data accumulation state of the data buffer 504. A indicates the amount of data when the buffer is accumulated until it becomes full. C indicates the data amount when the buffer becomes empty. B is an amount corresponding to a preset value. When the data amount in the data buffer 504 reaches the set amount B, the recording / reproduction drive control unit 506 instructs the recording / reproduction drive 505 to perform a recording operation. I do.

The "recording timing" indicates the timing at which the recording / reproducing drive 505 performs a recording operation on a mini-disc. The recording operation is represented by logic “0” and “1”, and the logic “1” means that the recording operation is being performed.
The “voice recording timing” is set in the voice compression / expansion unit 50.
3 indicates a timing at which data is written to the data buffer 504. As before, a logic "1" means that a voice recording is being made.

[0008] When recording (recording) audio data input from the recording source 502 on the mini-disc, during the period (A) of FIG. Enter recording mode,
At the same time, the “voice recording timing” becomes logic “1”, the voice data is input from the recording source 502, the voice compression / expansion unit 503 compresses the input voice data, and stores the obtained compressed data in the data buffer 504. accumulate. At this time, the recording / reproduction drive control unit 506 monitors the amount of data stored in the data buffer 504. Until this amount of data reaches the set amount B, the “recording timing is logical” and “0”. The recording / reproducing drive 505 is connected to the data buffer 504 as shown in FIG.
The control is performed so as not to perform reading of the record from the HDD and recording to the mini-disc. Therefore, data is accumulated in the data buffer at a constant rate. Accordingly, in the period (A) of FIG. 6A, the data amount of the data buffer 504 increases.

In the period (a) of FIG. 6A, the recording / reproduction drive control unit 506 determines the time q when the amount of data stored in the data buffer 504 reaches the data amount B in FIG.
, An instruction is issued to the recording / reproduction drive 505 to perform recording. Thus, at time q, the recording / reproduction drive 505 takes out the data stored in the data buffer 504 and records it on the mini-disc, as shown by the fact that the “recording timing” in FIG. I do. At this time, since the recording rate of the recording / reproducing drive is about four times as high as the writing rate of the audio compression / decompression unit 503, the data amount of the data buffer 504 decreases in the period (a) of FIG. In the period (c) of FIG. 6A, at the time point r when the data amount in the data buffer 504 reaches the data amount D, the recording / reproduction drive control unit 505 sends the data from the data buffer 504 to the recording / reproduction drive 505 again. Control is performed so that recording is not read out and recording on the mini-disc is not performed. Therefore, the audio compression / expansion unit 503 writes data to the data buffer 504, but the recording / reproduction drive 505 stops the recording operation. At this time, the period (a) in FIG.
The data is stored in the data buffer at the same constant rate as that of. Accordingly, in the period (c) of FIG. 6A, the data amount of the data buffer 504 increases as in the period (a) of FIG. 6A.

After the period (c) in FIG. 6 (a), the same operation as in the period (a) in FIG. 6 (a) is performed. Thereafter, the recording / reproduction drive control unit 506 performs the same control. , FIG.
By repeating the operations in the periods (a) and (c) in (a), the recording / reproducing drive 505 records the data supplied from the audio compression / decompression unit 503 on the mini disk.

As described above, since the data amount stored in the data buffer 504 is controlled so as not to exceed the data amount B, the data amount stored in the data buffer 504 and its full value A , A margin of (x) or more, which is the difference between the data amount A and the data amount B, is always maintained. As a result, even if the recording operation of the recording / reproducing drive cannot be performed at the scheduled timing, the data buffer 504 does not overflow immediately. In other words, if the recording / reproducing drive is temporarily unable to record due to vibration, or if the recording / reproducing drive needs to record at a remote location on the mini-disc, the recording operation is scheduled by performing a jump. Even when the timing cannot be obtained at the same timing, the data buffer 504 does not overflow immediately because there is always a margin of (x) or more between the full value A as described above. In this sense, the data buffer 504 is called a shock-proof memory (seismic memory).

P. Reproduction FIG. 6B shows the operation in the reproduction mode. In FIG. 6B, the data amount indicates the data accumulation state of the data buffer 504. A indicates the amount of data accumulated when the buffer is full, and C indicates the amount of data when the buffer is empty. B is an amount corresponding to a preset value. When the data amount in the data buffer 504 reaches the set amount B, the recording / reproduction drive control unit 506 performs a reproduction operation on the recording / reproduction drive 505. To instruct.

The reproduction timing is determined by the recording / reproduction drive 50.
Numeral 5 indicates the timing at which the reproduction operation from the mini-disc is performed. As in FIG. 6A, the logic "1" means that the reproducing operation is being performed. The audio playback timing is
The timing at which the audio compression / expansion unit 503 reads data from the data buffer 504 is shown. As above,
Logic "1" means that sound is being reproduced.

When reproducing the audio data recorded on the mini-disc, during the period (A) of FIG. 6B, first, the whole apparatus enters the reproduction mode at a time point p under the control of the system control unit 507, and at the same time, The reproduction timing becomes logical “1”, and the recording / reproduction drive 505 reads data from the mini-disc and stores the read data in the data buffer 504. At this time, the recording / reproducing drive control unit 506 monitors the amount of data stored in the data buffer. Until the data amount reaches the data amount D, the data is read out by the recording / reproducing drive 505 and the data buffer 504 is read out. Is controlled to continue the accumulation of Also, after time point p, the audio compression / expansion unit 503 retrieves data from the data buffer 504 until the data amount in the data buffer 504 reaches the data amount D so that the “audio reproduction timing” remains at logic “0”. , The data is accumulated in the data buffer 504 at a constant rate. Therefore, in the period (a) in FIG.
The data amount of the data buffer 504 increases.

In the period (a) of FIG. 6B, at the time q when the data amount in the data buffer 504 reaches the data amount D, the recording / reproducing drive 505 operates according to the control of the recording / reproducing drive control unit 506 as shown in FIG. To read data from the mini-disc and
4 and stop accumulation. At the same time, the audio compression / decompression unit 503 extracts data from the data buffer 504 and performs decompression processing to obtain and output PCM data. On the other hand, the recording / reproduction drive control unit 5
Reference numeral 06 monitors the amount of data in the data buffer 504 so that reading from the mini-disc by the recording / reproducing drive 505 and accumulation in the data buffer 504 are not performed until the data amount reaches a predetermined amount B. Control. For this reason, since the data in the data buffer 504 is being read out, the amount of data in the data buffer 504 decreases during the period (a) in FIG.

In the period (c) of FIG. 6B, at the time r when the data amount in the data buffer 504 decreases and reaches the data amount B, the recording / reproduction drive control unit 506
Controls the recording / reproducing drive 505 to read data from the mini-disc again and store the data in the data buffer 504 again. At this time, the recording / reproducing drive 505
Is about four times as high as the reading rate by the audio compression / decompression unit 503, the period (c) in FIG.
Then, the data amount of the data buffer 504 increases.

After the period (c) in FIG. 6 (b), the same operation as in the period (b) in FIG. 6 (b) is performed. Thereafter, the recording / reproduction drive control unit 506 performs the same control. , FIG.
By repeating the operations of the periods (a) and (c) of (b), the recording / reproducing drive 505 reproduces the data recorded on the mini disk, and outputs the PCM data at a constant rate from the audio compression / decompression unit 503. Is done.

As described above, the data amount stored in the data buffer 504 is controlled so as not to be less than the data amount B. In addition, a margin of (x) or more, which is the difference between the data amount B and the data amount C, is always maintained. As a result, even if the reproducing operation of the recording / reproducing drive cannot be performed at the scheduled timing, the data buffer 504 does not immediately become empty. That is, as described above, even when the reproducing operation cannot be performed at the expected timing due to the vibration or the jump, the margin (x) or more is always maintained between the empty value C as described above. , The data buffer 504 does not empty immediately. Therefore, the data buffer 504 is also called a shock-proof memory. As described above, the mini-disc system is resistant to vibration and does not need to interrupt the recording / reproducing operation when jumping to a remote area on the disc.

As described above, in the recording / reproducing apparatus according to the prior art, the transfer rates of the audio compression / decompression unit 503 and the recording / reproducing drive 505 for the data buffer 504 are both constant, and the recording / reproducing is performed. It is assumed that the transfer rate of the drive 505 exceeds the transfer rate of the audio compression / decompression unit 503. Since the recording / reproduction drive control unit 506 is provided, the data buffer 504 overflows by performing ON / OFF control of “performing” or “non-performing” of recording or reproduction in the recording / reproduction drive 505. In this case, the data amount is secured so as not to be lost or empty, thereby preventing interruption of recording and reproduction.

[0020]

As described above, in the conventional recording / reproducing apparatus, the recording / reproducing drive transfer rate to the data buffer exceeds the transfer rate of the audio compression / decompression unit to the data buffer. By controlling the reproduction drive, the data amount of the data buffer can be secured. Therefore, if it is desired to increase the transfer rate in the audio compression / expansion unit while securing the storage amount of the data buffer and preventing interruption of recording and reproduction by such control, it is necessary to increase the transfer rate in the recording and reproduction drive. Become.

However, it is not easy to improve the transfer rate of the recording / reproducing drive due to hardware limitations. That is, there is a problem that the life of the mechanism is shortened or the laser used for recording / reproduction needs to be strengthened, which leads to an increase in manufacturing cost. The present invention has been made in view of such circumstances, and without increasing the reproduction rate of a recording / reproduction drive,
It is an object of the present invention to provide a recording / reproducing system that enables high-speed recording and high-speed reproduction.

[0022]

According to another aspect of the present invention, there is provided a recording / reproducing system for recording / reproducing PCM data on / from a main recording medium, and a main recording / reproducing apparatus. The main recording / reproducing device is connected to the main recording / reproducing device, and the temporary storage means for temporarily storing data to be transferred between the main recording / reproducing device and the sub-recording / reproducing device. Recording on the main recording medium, or recording and reproduction processing means for performing reproduction from the main recording medium, and detects the amount of data temporarily stored in the temporary storage means, according to the amount of the detected data, Main recording / reproducing device control means for controlling a transfer rate of data input / output to / from the main recording / reproducing device; and detecting an amount of data temporarily stored in the temporary storage means, and responding to the detected amount of data. Te, in which a sub recording and reproducing apparatus control means for controlling the transfer rate of data input and output in the auxiliary recording and reproducing apparatus.

According to a second aspect of the present invention, in the recording / reproducing system according to the first aspect, the sub-recording / reproducing device is a PCM with respect to the main recording / reproducing device.
A recording source for outputting data, the temporary storage means being a data buffer for temporarily storing data output from the recording source, and the recording / reproducing processing means reading data from the data buffer; A sub-recording / reproducing device control means for detecting the amount of data temporarily stored in the data buffer, and according to the detected data amount, the recording source. Is a recording source control unit for controlling the transfer rate of the data output in.

According to a third aspect of the present invention, in the recording / reproducing system according to the second aspect, the recording source control unit determines that an amount of data temporarily stored in the data buffer is larger than a predetermined value. When the data source temporarily instructs the recording source to lower the transfer rate of the output data, and when the amount of data temporarily stored in the data buffer becomes smaller than a predetermined value, the transfer of the output data to the recording source is performed. It is an instruction to increase the rate.

According to a fourth aspect of the present invention, in the recording / reproducing system according to the first aspect, the sub recording / reproducing apparatus reads out the audio data converted into analog data in the main recording / reproducing apparatus. A recording device for recording on the sub recording medium, wherein the recording / reproducing processing means is a reproducing drive for reading data from the main recording medium and writing the read data to the data buffer; Is a recording device control unit that detects the amount of data temporarily stored in the data buffer and controls the transfer rate of data input to the recording device according to the detected data amount.

According to a fifth aspect of the present invention, in the recording / reproducing system according to the fourth aspect, the recording device control unit determines that the amount of data temporarily stored in the data buffer is smaller than a predetermined value. The recording device is instructed to reduce the recording transfer rate, and when the amount of data temporarily stored in the data buffer is greater than a predetermined value, the recording device is notified of the recording transfer rate. It is an instruction to raise.

According to a sixth aspect of the present invention, in the recording / reproducing system according to the first aspect, the main recording / reproducing apparatus transmits the data read from the sub-recording medium in the sub-recording / reproducing apparatus. The main recording / reproducing apparatus has a recording mode for recording on the main recording medium, and a reproduction mode for recording data reproduced on the main recording / reproducing apparatus on the sub recording medium in the sub recording / reproducing apparatus. The system further includes a system control unit for switching between the recording mode and the reproduction mode.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. The recording / reproducing system according to the first embodiment of the present invention functions as a recording system, and while maintaining the data accumulation amount in the data buffer,
This realizes high-speed recording by transfer control.

The recording / reproducing system according to the first embodiment will be described with reference to the drawings, taking as an example a case where data obtained from a recording source such as a CD player is recorded on a mini-disc by a mini-disc device.

FIG. 1 is a block diagram showing the configuration of the recording system of the present invention. As shown, the recording system of the present invention comprises a recording source such as a CD player and a mini disk device. Reference numeral 101 denotes a mini disk device that records PCM data. A recording source 102 is realized by a CD player or the like, and supplies PCM data to the mini disc device 101. An audio compression unit 103 compresses the audio data supplied from the recording source 102 to ４ and inputs the compressed data to a data buffer 104. 1
A data buffer 04 temporarily stores the compressed data input from the audio compression unit 103. Reference numeral 105 denotes a recording drive which reads out compressed data from the data buffer 104 and records the data on a mini disk. A recording drive control unit 106 monitors the data amount of the data buffer 104 and controls the recording operation of the recording drive 105 according to the data amount. 107 is a system control unit,
Controls the operation of the entire device. A recording source control unit 108 controls the data output rate of the recording source 102 according to the amount of data in the data buffer 104.

FIG. 2 is a timing chart showing the operation of the recording system of the present embodiment. 2, the data amount indicates the data accumulation state of the data buffer 104.
A indicates the amount of data accumulated until the buffer becomes full. C indicates the data amount when the buffer becomes empty.
B and D indicate the amount of data serving as a threshold used for control. The recording rate indicates the data recording rate of the recording drive 105. The recording source output rate indicates the data output rate of the recording source 102.

The operation of the recording system according to the first embodiment at the time of normal recording (R-1) and under the control of the recording source control unit (R-2) will be described with reference to FIGS. It will be described with reference to FIG.

R-1. During normal recording When recording is performed from the recording source 102, which is a CD player, to the mini-disc, during the period (A) in FIG. 2, the entire apparatus enters the recording mode at the time point p in FIG. . And recording source 1
When PCM data, which is audio data, is input from 02, the audio compression unit 103 performs compression processing on the input PCM data, and accumulates the obtained compressed data in the data buffer 104. The recording drive control unit 106 monitors the amount of data stored in the data buffer 104. Until the data amount exceeds the data amount D, the recording drive 10
5 controls so as not to read the record from the data buffer and to record on the mini-disc. Therefore, since the recording drive 105 stops operating during this period, data is accumulated in the data buffer 104 at a constant rate. Therefore, the data amount of the data buffer 104 increases in the period (A) of FIG.

In the period (a) of FIG. 2, the recording drive control unit 106 detects that the data amount of the data buffer 104 exceeds the data amount D at the time point q, and performs recording on the recording drive 105. Output instructions to Upon receiving this, the recording drive 105 reads the data from the data buffer 104 and starts recording on the mini-disc. Here, in the first embodiment, the recording source 1
02, the processing rate of the audio compression unit 103, and the data recording rate of the recording drive 105 are the same, and the data recording rate of the recording drive 105 is set to take its maximum value. . Therefore, input and output to and from the data buffer 104 are performed at the same rate, and during the period (a) in FIG. 2, the data amount of the data buffer 104 is kept constant. This is a state at the time of normal recording, and recording is performed in this manner unless there is a situation like R-2 described later.

R-2. Control by Recording Source Control Unit R-1. In the above, the state at the time of normal recording has been described.
05 in the event that recording becomes impossible, the above R-1. By maintaining the state of the normal record of
Since data is not taken out from the data buffer 104, the data amount increases, and eventually the buffer overflows. Therefore, in such a situation, the recording system according to the first embodiment aims to prevent buffer overflow by performing control by the recording source control unit 108.

The periods (c) to (d) in FIG. 2 show such a case. In the period (c) of FIG.
Indicates that the recording rate is 0, which indicates that recording by the recording drive 105 has become impossible.
As described above, when the data amount increases and eventually reaches the data amount B, the recording source control unit 108 monitoring the data amount of the data buffer 104 detects this, and the recording source 102
, An instruction to reduce the data output rate to １ ／. Therefore, the data amount of the data buffer 104 increases during the period (c) in FIG.

In the period (d) of FIG. 2, as shown by the increase in the recording rate at the time point s, the recording drive 105
Recording resumes, the next recording drive 1
Data is taken out of the data buffer 104 by the method 05, and the data amount of the data buffer 104 is reduced. During this time, the rate control of the recording source 102 by the recording source control unit 108 is continued, and the data output rate from the recording source 102 is low, so that the amount of data in the data buffer 104 rapidly decreases. It will be below the quantity B.

In the period (e) of FIG. 2, when the recording source control unit 108 detects that the data amount in the data buffer 104 has become smaller than the data amount B, the recording source control unit 108 restores the data output rate of the recording source 102 again. In the period (e) of FIG. 2, the above R-1. Recording is performed in the same manner as described above. Thus, between the data amount A,
By having a margin of (x), buffer overflow is prevented.

In the recording system according to the first embodiment,
R-1. As shown in the above, in recording on the mini disk, the data recording rate of the recording drive 105 is maintained at the maximum value, and the writing rate of the audio compression unit 103 and the data output rate of the recording source 102 are set to the maximum values. By controlling the value to be equal to the data recording rate, recording can be performed at a transfer rate that is about four times that of a general mini-disc device. Further, it is possible to keep the data amount of the data buffer 104 constant while performing such recording.

The above R-2. In the case where the recording source control unit 108 controls the transfer rate of the recording source 102 according to the data amount of the data buffer as shown in FIG. Even when the recording operation cannot be performed at the scheduled timing because the recording drive 105 needs to jump to a distant place on the disk to record, the recording source control unit 108 controls the recording source 102
By controlling the data output rate, the data buffer 104 is prevented from overflowing.

As described above, in the recording system according to the first embodiment, the audio compression unit 103 and the data buffer 10
4, recording drive 105, recording drive control unit 106,
And recording source control unit 1 in addition to system control unit 107
08, the recording is performed in synchronization with the maximum recording rate by the recording drive 105 in a normal recording state, and the data output rate of the recording source 102 is reduced when there is a possibility of overflow of the buffer. Since this is prevented by controlling, the recording rate can be made about four times that of the conventional system and the amount of data stored in the data buffer 104 can be controlled irrespective of hardware restrictions. Things.

Although the case where the data recording rate of the recording drive is the same as the transfer rate of the compressed data has been described, even when the data recording rate of the recording drive is high,
According to the present invention, the margin until the data buffer overflows can be increased, so that the size of the data buffer can be reduced.

Embodiment 2 The recording / reproducing system according to the second embodiment of the present invention functions as a reproducing system, and achieves high-speed recording by transfer control while maintaining the data accumulation amount in the data buffer. Regarding the recording and reproducing system according to the second embodiment, an example in which audio data recorded on a mini-disc is reproduced and recorded on a recording drive such as a compact cassette recorder connected to a mini-disc device will be described with reference to the drawings. explain.

FIG. 3 is a block diagram showing the configuration of the reproduction system of the present invention. As shown in the figure, the reproducing system of the present invention comprises a recording device such as a compact cassette recorder and a mini disk device. Reference numeral 301 denotes a mini disk device for reproducing PCM data. 302
Denotes a recording device, which is realized by a compact cassette recorder or the like, and records an audio signal output from the mini disk device 301. An audio decompression unit 303 reads out the compressed data from the data buffer 304 and decompresses the data. A data buffer 304 temporarily stores data input from the reproduction drive 305. 30
Reference numeral 5 denotes a playback drive which reads data from the mini-disc and inputs the data to the data buffer 304.
Reference numeral 306 denotes a playback drive control unit, and the playback drive 30
5 is controlled. A system control unit 307 controls the operation of the entire apparatus. A recording device control unit 308 controls the recording rate of the recording device 302 and the processing rate of the audio decompression unit 303 according to the amount of data in the data buffer 304. Reference numeral 309 denotes a DA converter that converts PCM data, which is digital data that has undergone expansion processing by the audio expansion unit 303, into analog data.

FIG. 4 is a timing chart showing the operation of the reproduction system of the present embodiment. In FIG. 4, the data amount indicates the data accumulation state of the data buffer 304. A indicates the amount of data when the buffer is accumulated until it becomes full. C indicates the data amount when the buffer becomes empty. B indicates a data amount serving as a threshold used for control. The reproduction rate indicates the data reproduction rate of the reproduction drive 305. The audio playback rate depends on the recording device 30
2 shows a recording rate of 2. The operation of the playback system according to the second embodiment during normal playback (P-1) and when receiving control by the recording device control unit (P-2) will be described below.
This will be described with reference to FIGS.

P-1. At the time of normal reproduction When recording the audio data reproduced from the mini disc to the recording device 302 which is a compact cassette recorder,
In the period (A) of FIG. 4, first, the system control unit 307
Controls the whole apparatus to enter the reproduction mode at time point p in FIG. Then, the playback drive control unit 306 instructs the playback drive 305 to start the playback operation.
On the other hand, the recording device control unit 308 monitors the amount of data stored in the data buffer 304, and does not start the operation of the audio decompression unit 303 and the recording device 302 until the data amount exceeds the data amount B. Control. Therefore, during the period (A) in FIG. 4, since the operation of the audio decompression unit 303 and the recording device 302 is stopped, data is accumulated in the data buffer 304 at a constant rate. Therefore, in the period (A) of FIG. 4, the data amount of the data buffer 304 increases.

In the period (a) of FIG. 4, the recording device control unit 308 detects that the data amount of the data buffer 304 has exceeded the data amount B at the time point q, and
3 and instruct the recording device 302 to start processing.
Then, the audio decompression unit 303 reads the data from the data buffer 304 and performs decompression processing, and outputs the obtained PCM data to the DA converter 309. The D / A converter 309 performs a conversion process and outputs analog data to the recording device 302, and the recording device 302 receiving the data starts recording audio data. Here, in the second embodiment, the data playback rate of the playback drive 305, the processing rate of the audio decompression unit 303, and the recording rate of the recording device 302 are the same, and the playback rate of the playback drive 305 is the maximum value. It is set to take. Therefore, input / output to / from the data buffer 304 is performed at the same rate, and the data amount of the data buffer 304 is kept constant during the period (a) in FIG. This is the state at the time of normal reproduction, and is described in P-2. Unless there is such a situation, the reproduction is performed in this way.

P-2. Control by recording device control section P-1. Has described the state during normal playback. However, the playback drive 30
If there is a situation where playback in 5 becomes impossible,
The above P-1. If the normal playback state is maintained, no data is input to the data buffer 304, so that the data amount is reduced.
Ends up in the sky. Therefore, in such a situation, in the reproduction system according to the second embodiment, the control of the recording device control unit 308 is performed to prevent the data buffer 304 from becoming empty.

The periods (c) to (d) in FIG. 4 show such a case. In the period (c) of FIG.
In the example, the data reproduction rate is 0, which indicates that reproduction by the reproduction drive 305 has become impossible. As described above, the data amount decreases and falls below the data amount B. Then, the recording device control unit 308 monitoring the amount of data in the data buffer 304 detects this, and outputs an instruction to the audio decompression unit 303 to reduce the data read rate from the data buffer 304 to １ ／.
At the same time, the recording rate is set to 1 /
2 is output. Therefore, the data amount of the data buffer 304 decreases during the period (c) in FIG.

In the period (d) of FIG. 4, as shown by the increase in the reproduction rate at the time point s, the reproduction drive 305
, The data input to the data buffer 304 is performed again, and the data amount of the data buffer 304 increases. During this time, the control of the recording device control unit 308 and the recording device 302 is continued, and the data rate of the data buffer 304 increases rapidly because the processing rate of the audio decompression unit 303 and the recording rate of the recording device 302 are low. , At time t, the data amount B is exceeded.

When the recording device control unit 308 detects that the data amount in the data buffer 304 has exceeded the data amount B in the period (e) of FIG.
02, and the processing rate of the audio decompression unit 303 are controlled so as to return to their original values. Therefore, in the period (e) of FIG. Normal reproduction is performed in the same manner as described above. As described above, since the data amount in the data buffer 304 has a margin of (x) between the data amount C and the data amount C, the buffer does not become empty.

In the reproducing system according to the second embodiment,
The above P-1. When recording the audio data reproduced from the mini-disc in the compact cassette recorder as shown in FIG. 1, the data reproduction rate of the reproduction drive 305 is maintained at the maximum value, the processing rate by the audio expansion unit 303, and the recording device By controlling the recording rate by 302 so as to be equal to the maximum data reproduction rate, recording can be performed at a reproduction rate that is about four times that of a general mini-disc system.

The above P-2. By providing the recording device control unit 308 as shown in FIG.
The recording device control unit 308 controls the recording rate of the recording device 302 and the processing rate of the audio decompression unit 303 in accordance with the data amount 04, and the recording drive 305 is temporarily vibrated and cannot be temporarily reproduced. In the case, or when the reproducing drive 305 needs to jump to a distant place on the disc and perform the reproducing operation, the reproducing operation cannot be performed at the scheduled timing.
And the recording rate by the recording device 302,
By controlling the processing rate by the audio decompression unit 303, the data buffer 304 is prevented from being empty.

As described above, according to the reproduction system of the second embodiment, the audio decompression unit 303 and the data buffer 30
4. Playback drive 305 and playback drive control unit 30
6. A recording device control unit 308 is provided, which performs reproduction in synchronization with the maximum data reproduction rate by the reproduction drive 305 in a normal reproduction state, and when the buffer may be empty, the recording device 302 This is prevented by controlling the recording rate of the conventional system and the processing rate of the audio decompression unit 303 to be reduced.
It is possible to record as double, and control the amount of data stored in the data buffer 304.

In the second embodiment, the case where the data transfer rate of the reproducing drive is the same as the value of the data compression ratio times the transfer rate of the recording device has been described. Even when the rate is high, the margin until the data buffer becomes empty can be increased, so that the size of the data buffer can be reduced.
Also, a compact cassette recorder has been described as an example of a recording device. However, among mini disk recorders and the like, a recording device capable of changing the recording rate can achieve the same effects.

In the second embodiment, a recording device such as a compact cassette has been described as an example of a transfer destination of the reproduction data. However, the present invention is applicable to a case where the reproduction data is transferred to a portion to be recorded on the device. The present invention is not limited to this. If the input rate can be controlled, for example, the signal may be output to a transmission unit such as a communication device that can control the input data rate, and the same effect can be obtained.

Furthermore, in the recording / reproducing systems according to the first and second embodiments of the present invention, the case where the recording / reproducing is performed by compressing or expanding the audio data has been described. However, the present invention is not limited to this. Instead, a similar effect can be obtained even with a recording / reproducing system that does not involve compression / expansion. Further, the recording device is described in the first embodiment of the present invention, and the reproducing device is described in the second embodiment.
It is also possible to configure a recording / reproducing system which has a recording mode and a reproducing mode, and switches the mode by the system control unit.

[0058]

According to the recording / reproducing system of the first aspect,
In a recording / reproducing system including a main recording / reproducing device for recording / reproducing PCM data to / from a main recording medium and a sub-recording / reproducing device connected to the main recording / reproducing device,
The main recording / reproducing device includes a main storage / reproducing device, a temporary storage unit for temporarily storing data to be transferred between the sub recording / reproducing device, and recording on the main recording medium, or Recording and reproduction processing means for performing reproduction, detecting the amount of data temporarily stored in the temporary storage means,
In accordance with the detected amount of data, the main recording / reproducing device, the main recording / reproducing device control means for controlling a data input / output transfer rate, and detecting the amount of data temporarily stored in the temporary storage means, By providing a sub-recording / reproducing device control means for controlling a data input / output transfer rate in the sub-recording / reproducing device according to the detected data amount, high-speed recording / reproducing and securing of a temporary storage amount This prevents the interruption of the transfer due to the error.

According to the recording / reproducing system of the second aspect, in the recording / reproducing system of the first aspect, the sub recording / reproducing device is a recording source for outputting PCM data to the main recording / reproducing device, The temporary storage means is a data buffer for temporarily storing data output from the recording source, and the recording / reproducing processing means reads data from the data buffer and records the read data on the main recording medium. A sub-recording / reproducing device control means for detecting a data amount temporarily stored in the data buffer, and controlling a data output rate in the recording source in accordance with the detected data amount. The control unit further increases the data output rate of the recording source and the data recording rate of the recording drive. Was collected by the same as, more data recording rate of the recording drives With taking the maximum value, high speed performs recording, and it is possible to perform secure temporary storage of data.

According to the recording / reproducing system of the third aspect, in the recording / reproducing system of the second aspect, the recording source control unit may be configured such that an amount of data temporarily stored in the data buffer is larger than a predetermined value. Instructing the recording source to lower the data output rate, and instructing the recording source to increase the data output rate when the amount of data temporarily stored in the data buffer becomes smaller than a predetermined value. Therefore, even when the recording operation is interrupted, it is possible to secure the temporary storage amount.

According to the recording / reproducing system of the fourth aspect, in the recording / reproducing system of the first aspect, the sub-recording / reproducing apparatus reads the PCM data from the main recording / reproducing apparatus and records it on a sub-recording medium. An apparatus, wherein the recording / reproducing processing means is a reproducing drive for reading data from the main recording medium and writing the read data to the data buffer; and the sub-recording / reproducing apparatus control means temporarily stores the data in the data buffer. By detecting the amount of accumulated data and providing the recording device with a recording device control unit that controls the recording rate in accordance with the detected data amount, the recording rate of the recording device , And the data playback rate of the playback drive are the same, and the data playback rate of the playback drive takes the maximum value, Performs playback speed, and it is possible to achieve a secure temporary storage of data.

According to the recording / reproducing system of the fifth aspect, in the recording / reproducing system of the fourth aspect, the recording device control section determines that the amount of data temporarily stored in the data buffer is smaller than a predetermined value. When the recording device is instructed to reduce the recording rate, and when the amount of data temporarily stored in the data buffer is larger than a predetermined value, the recording device is instructed to increase the recording rate. By doing so, it is possible to secure a temporary storage amount even when the reproduction operation is interrupted.

According to the recording / reproducing system of claim 6, in the recording / reproducing system according to claim 1, the main recording / reproducing device transmits the data read from the sub-recording medium to the main recording / reproducing device. The recording / reproducing apparatus has a recording mode for recording on a main recording medium, and a reproduction mode for recording data reproduced by the main recording / reproducing apparatus on a sub recording medium in the sub recording / reproducing apparatus. By further including a system control unit that switches between the mode and the reproduction mode, an apparatus that performs both recording and reproduction can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a recording device according to a first embodiment of the present invention.

FIG. 2 is a timing chart illustrating an operation of the recording apparatus according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a playback device according to a second embodiment of the present invention.

FIG. 4 is a timing chart showing an operation of the reproducing apparatus according to the second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a recording / reproducing apparatus according to a conventional technique.

FIG. 6 is a timing chart illustrating an operation of a recording / reproducing apparatus according to a conventional technique.

[Explanation of symbols]

 101 Mini disc device 102 Recording source 104 Data buffer 105 Recording drive 106 Recording drive control unit 107 System control unit 108 Recording source control unit 301 Mini disc device 302 Recording device 303 Audio decompression unit 304 Data buffer 305 Reproduction drive 306 Reproduction drive control unit 307 System control unit 308 Recording device control unit 501 Mini disk device 502 Recording source 503 Audio compression / decompression unit 504 Data buffer 505 Recording / reproduction drive 506 Recording / reproduction drive control unit 507 System control unit

Claims (6)

[Claims] 1. A recording / reproducing system comprising: a main recording / reproducing apparatus for recording / reproducing PCM data on / from a main recording medium; and a sub-recording / reproducing apparatus connected to the main recording / reproducing apparatus. A temporary storage unit for temporarily storing data to be transferred between the main recording / reproducing device and the sub recording / reproducing device; and a recording / reproducing process for recording on the main recording medium or reproducing from the main recording medium. Means for detecting the amount of data temporarily stored in the temporary storage means, and controlling the transfer rate of data input / output to / from the main recording / reproducing apparatus in accordance with the detected amount of data. Detecting the amount of data temporarily stored in the temporary storage means, and changing the data input / output transfer rate in the sub-recording / reproducing device in accordance with the detected amount of data. Gosuru reproducing system characterized by comprising an auxiliary recording and reproducing apparatus control means. 2. The recording / reproducing system according to claim 1, wherein the sub-recording / reproducing device is a P / P with respect to the main recording / reproducing device.
A recording source that outputs CM data; the temporary storage unit is a data buffer that temporarily stores data output from the recording source; the recording / reproducing processing unit reads data from the data buffer; A recording drive for recording the read data on the main recording medium; the sub-recording / reproducing device control means detects an amount of data temporarily stored in the data buffer, and performs the recording in accordance with the detected data amount; A recording / reproducing system, which is a recording source control unit for controlling a transfer rate of data output at a source. 3. The recording / reproducing system according to claim 2, wherein the recording source control unit outputs to the recording source when an amount of data temporarily stored in the data buffer becomes larger than a predetermined value. Instruct to lower the data transfer rate, and instruct the recording source to increase the output data transfer rate when the amount of data temporarily stored in the data buffer becomes smaller than a predetermined value. Recording / playback system characterized by the above-mentioned. 4. The recording / reproducing system according to claim 1, wherein the sub recording / reproducing device is a recording device that reads out audio data converted into analog data in the main recording / reproducing device and records the read audio data on a sub recording medium. The recording / reproducing processing means is a reproducing drive for reading data from the main recording medium and writing the read data to the data buffer; and the sub-recording / reproducing apparatus control means is temporarily stored in the data buffer. A recording / reproducing system, comprising: a recording device control unit that detects a data amount and controls a transfer rate of data input to the recording device according to the detected data amount. 5. The recording / reproducing system according to claim 4, wherein the recording device control unit records the data to the recording device when an amount of data temporarily stored in the data buffer becomes smaller than a predetermined value. And that when the amount of data temporarily stored in the data buffer becomes larger than a predetermined value, the recording device is instructed to increase the recording transfer rate. Characteristic recording and playback system. 6. The recording / reproducing system according to claim 1, wherein the main recording / reproducing device reads the data read from the sub-recording medium in the sub-recording / reproducing device with respect to the main recording medium in the main recording / reproducing device. And a reproduction mode for recording data reproduced by the main recording / reproducing apparatus on the sub recording medium in the sub recording / reproducing apparatus. Switching between the recording mode and the reproduction mode A recording / reproducing system, further comprising a system control unit for performing: