JPS6370966A - Digital recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent data break while changing a recording medium and to attain continuous recording and continuous reproduction by accumulating data for recording by means of a first buffer memory at the time of recording, and reproducing with data accumulated in a second buffer memory at the time of reproducing. CONSTITUTION:Write control signals W1 are sequentially generated in a constant period at the time of recording. Before the recording medium is changed, read control signals R1 are sequentially generated in a constant period corresponding to the write control signals W1, and digitaized data are sequentially read from the buffer memory 20 and recorded in the recording medium. If the recording medium begins to be changed, digitaized data is not read from the buffer memory 20. At such a time, the generation of the write control signals W1 continues, whereby the sequential writing of digitaized data continues. If the change of the recording medium ends the control signals R1 are generated in a constant period again.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a digital recording and reproducing device that records digitized data on a recording medium and reproduces the digitized data from the recording medium. In particular, the present invention relates to a device that prevents interruption of recording and reproducing operations when replacing the recording medium.

(Prior Art) As is well known, in the field of sound equipment and dual-edge devices, information signals such as acoustic signals and image signals are Digital recording and reproducing systems have become widespread, in which the data is converted into digitized data using PCM (pulse code modulation) technology, recorded on a recording medium such as a magnetic tape or a disk, and then reproduced.

FIGS. 9(a) and 9(b) respectively show recording and reproducing means in a digital recording and reproducing apparatus using magnetic tape as a recording medium. In other words, when recording,
As shown in FIG. 9(a), the analog information signal supplied to the input terminal 11 is A/D (analog/digital)
The conversion circuit 12 converts the data into digitized data.

The digitized data is subjected to predetermined digital processing such as parity generation and formatting by the modulation circuit 13, and then modulated and written to the magnetic tape 14, where the digitized data is transferred to the magnetic tape 14. Recording is done.

Furthermore, during reproduction, as shown in FIG. 9(b), the digitized data read from the magnetic tape 14 is supplied to the demodulation circuit 15, where it is subjected to predetermined digital processing such as demodulation and error correction. . The digitized data output from the demodulation circuit 15 is converted into the original analog information signal by a D/A (digital/analog) conversion circuit 16, and is supplied to an analog playback system (not shown) via an output terminal 17. Here, the digitized data from the magnetic tape 14 is reproduced.

By the way, the digital recording and reproducing system as mentioned above is
Signal recording compared to traditional analog recording and playback systems! ! Although it is significantly superior in terms of fifths, fidelity, and operability, it is still the same as analog recording and playback systems.If the magnetic tape 14 reaches the end during recording, a new tape Since it is not possible to record during the exchange, the data becomes discontinuous. Also, during playback, playback is stopped while the tape is replaced, so continuous playback is not possible.

(Problems to be Solved by the Invention) As described above, in conventional digital recording and reproducing devices, like analog recording and reproducing systems, recording and reproducing cannot be performed while the recording medium is replaced, resulting in discontinuous data. The problem is that the

Therefore, the present invention has been made in consideration of the above circumstances, and provides an extremely good digital recording and reproducing device that prevents data from being interrupted even when the recording medium is replaced and can perform continuous recording and continuous reproduction. The purpose is to

[Structure of the Invention] (Means for Solving the Problems) That is, the digital recording/reproducing device according to the present invention sequentially writes data for recording into a first buffer memory at the time of recording, and also writes data for recording into a first buffer memory. To read data from a buffer memory in the order in which it was written and record it on a recording medium. When replacing the recording medium,
Reading of data from the first buffer memory is stopped, data for recording is stored in the first buffer memory, and when the recording medium has been replaced, reading of data from the first buffer memory is started. The system starts recording on the replaced new recording medium.

Also, during playback, the data played back from the recording medium is
While sequentially writing to the second buffer memory,
reads and plays data from the buffer memory in the order in which it was written. When replacing the recording medium, the second
Stop writing data to the second buffer memory, read and play back the data stored in the second buffer memory, and when the recording medium has been replaced, play back to the second buffer memory. This is to start writing data.

(Function) According to the above configuration, during the recording medium exchange period, data for recording is stored in the first buffer memory during recording, and data for recording is stored in the second buffer memory 1. during playback. : Since the data is played back using the accumulated data, data is prevented from being interrupted even while the recording medium is replaced, and continuous recording and continuous/playback can be performed.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. First, FIG. 1 shows a portion of the digital recording and reproducing apparatus described in this embodiment that is used for recording operations. That is, the analog information signal supplied to the input terminal 18 is converted into digitized data by the A/D conversion circuit 19 and supplied to the buffer memory 20 .

Input digitized data is sequentially written into the buffer memory 20 in response to a write control signal W1 supplied to a control terminal 21, and the data is stored in accordance with a read control signal R1 supplied to a control terminal 22. The digitized data is sequentially read out in the order in which it was written, and has a capacity that can store a predetermined amount of digitized data.

The digitized data read from the buffer memory 20 is supplied to the modulation circuit 23, where it undergoes predetermined digital processing such as parity generation and formatting, and then is modulated and sent via the output terminal 24. It is designed to be recorded on a recording medium (not shown).

Next, FIG. 2 shows a portion of the digital recording and reproducing apparatus described in this embodiment that is used for reproducing operation. That is, digitized data read from a recording medium (not shown) is sent to the demodulation circuit 26 via the input terminal 25.
The signal is supplied to the buffer memory 27 after being subjected to predetermined digital processing such as demodulation and error correction.

The buffer memory 27 is sequentially written with input digitized data in response to a write control signal W2 supplied to a control terminal 28, and in response to a read control signal @R2 supplied to a -control terminal 29. The stored digitized data is sequentially read out in the order in which it was written, and has a capacity that can store a predetermined amount of digitized data.

The digitized data read from the buffer memory 27 is converted into the original analog information signal by the D/A conversion circuit 30, and is supplied to an analog playback system (not shown) via the output terminal 31. .

In the digital recording and reproducing apparatus as described above, exchanging the recording medium during recording will first be explained with reference to FIG. That is, the write control signal W1 for the buffer memory 20 is sequentially generated at a constant cycle, as shown in FIG. 3(a), and digitized data is written to the buffer memory 20.

Before the time t1 when the recording medium is replaced, the read control signal R1 is as shown in FIG. 3(1)).
The digitized data is sequentially generated at a constant cycle in response to the outdated control signal W1, and the digitized data is sequentially read out from the buffer memory 20 and recorded on the recording medium.

In this state, when the recording medium is started to be replaced at time t1, the read control signal R1 is no longer generated and digitized data is no longer read from the buffer memory 20. At this time, since the write control signal W1 continues to be generated at a constant cycle, digitized data continues to be sequentially written into the buffer memory 20.

Then, when the exchange of the recording medium is completed at time t2, the readout control signal R1 is again generated at regular intervals, reading of the digitized data from the buffer memory 20 is started, and the digitized data is transferred to the recording medium. data will now be recorded.

In this case, after time t2, the buffer memory 20
From then on, the digitized data stored in the buffer memory 20 after time t1 is sequentially read out.

That is, during the recording medium exchange period T1, the digitized data output from the A/D conversion circuit 19 is stored in the buffer memory 20, and when the recording medium exchange is completed, the digitized data is stored in the buffer memory 20. The digitized data is sequentially read out and recorded on a new recording medium.

Therefore, the digitized data output from the A/D conversion circuit 19 during the recording medium exchange period T1 will also be recorded on the new recording medium after the exchange, making it possible to perform continuous recording. It is something that becomes. In this case, the recording medium replacement period BT1 is set in advance to an appropriate period,
The capacity of the buffer memory 20 is set so that all of the digitized data generated from the A/D conversion circuit 19 within this period can be written into the buffer memory 20.

Next, exchanging the recording medium during reproduction will be explained with reference to FIG. 4. That is, in this case, first, the write control signal W2 to the buffer memory 27 is transmitted during the recording medium exchange period of 12 minutes, as shown in FIG. 4(a).
Digitized data that is sequentially generated at a constant cycle and output from the WLy4 circuit 26 is sequentially loaded into the buffer memory 27.

Thereafter, the read control signal R2 is changed to write υII! as shown in FIG. 4(b). The digitized data is sequentially generated at a constant cycle in response to the I signal W2, and the digitized data is sequentially read out from the buffer memory 27 and reproduced. In other words, the time t3 at which the recording medium is replaced
Previously, digitized data corresponding to the recording medium exchange period of 12 minutes was constantly stored in the buffer memory 27.

In this state, when the exchange of the recording medium is started at time t3, the write control signal W2 is no longer generated, and digitized data is no longer written to the buffer memory 21. At this time, since the read control signal R2 continues to be generated at a constant cycle, the digitized data continues to be read out from the buffer memory 27 in sequence.

When the exchange of the recording medium is completed at time t4, the write control signal W2 is again generated at regular intervals, and writing of digitized data to the buffer memory 27 is started.

In other words, during the recording medium exchange period T2, the digitized data (
The digitized data corresponding to the recording medium exchange period of 12 minutes is read out and played back, and when the recording medium exchange is completed, the digitized data obtained from the new recording medium is written into the buffer memory 27. It is read out and played back.

Therefore, even during the recording medium exchange period T2, digitized data is sequentially read out from the buffer memory 27 at a constant timing, making it possible to perform continuous reproduction. In this case, the buffer memory 27 is of course set to have a capacity capable of storing digitized data corresponding to the 12-minute exchange period of the recording medium.

Note that the recording buffer memory 20 and the reproduction buffer memory 27 used in the above-mentioned deer example may be configured so that one memory is used in common.

Next, FIGS. 5 and 6 show a modification of the portion of the above embodiment used for recording and reproducing operations, in which a recordable disk 32 is used as the recording medium. Then, depending on the amount of digitized data stored in the buffer memory 20.27, the operation of the modulation circuit 23 and the demodulation circuit 26 and the operation of the disk motor 3 that rotationally drives the disk 32 are controlled.
The rotational speed of No. 3 is controlled to change the recording and reproducing speeds.

In FIG. 5, digitized data input to the buffer memory 20 is supplied from the A/D conversion circuit 19 via the input terminal 34. Further, in FIG. 6, the digitized data outputted from the buffer memory 27 is outputted to the D/A conversion circuit 30 via the output terminal 35.

Here, first, exchange of the recording medium in the recording section shown in FIG. 5 will be explained with reference to FIG. 7. That is, the write control signal W for the buffer memory 20
As shown in FIG.
is written in.

And, before replacing the disk 32, fiffiT
3, the read control signal R1 is sequentially generated at a constant cycle in response to the write-only suburban signal @W1 as shown in FIG. 7(b), and the digitized data is sequentially generated from the buffer memory 20. The readings are compared and digitized data is recorded on the disk 32. In this case, the free capacity of the buffer memory 20 is large as shown in FIG. 7(C), and a large amount of digitized data can be stored.

Next, in the replacement ff1T4 of the disk 32, as described above, the read control signal R1 is no longer generated, and digitized data is no longer read from the buffer memory 20. At this time, since the write control signal W1 continues to be generated at a constant cycle, digitized data continues to be sequentially written into the buffer memory 20, and the free capacity of the buffer memory 20 gradually decreases. become.

Then, when the replacement of the disk 32 is completed, the read control signal R1 is generated in a short cycle during the first period T5, so that the digitized data is extracted from the buffer memory 20 at high speed. Become. At this time, the disk 32 is also rotated at high speed, and digitized data is recorded at high speed.

Therefore, the free capacity of the buffer memory 20 gradually increases.

After that, in the second period T6, the read control signal R1 is returned to the original fixed cycle, and the rotational speed of the disk 32 also returns to normal, and the disk is in a stable state with a large amount of free space in the buffer memory 20. Recording of digitized data to 32 is performed.

Next, exchanging the recording medium in the reproduction section shown in FIG. 6 will be explained with reference to FIG. 8. That is, in the period T7 before replacing the disk 32, first the disk 3
2 is rotated at high speed, and reproduction is performed at speed a. Therefore, as shown in FIG. 8(a), the write control signal W2 for the buffer memory 27 is also generated sequentially in short cycles, and the digitized data output from the demodulation circuit 26 is sequentially transferred to the buffer memory 27 at high speed. It will be written as .

At this time, the readout control signal R2 is as shown in FIG. 8(b).
As shown in FIG. 3, the digitized data is sequentially generated at a constant period longer than the write III control signal W2, and the digitized data is sequentially read out from the buffer memory 27 and reproduced. Therefore, the storage capacity of the buffer memory 27 gradually increases as shown in FIG. 8(C).

Then, during period T8 when the storage capacity of the buffer memory 27 is approximately at its maximum, the write control signal W2 begins to be generated at a constant cycle corresponding to the read control signal R2, and the rotational speed of the disk 32 increases accordingly. It is restored to normal, and below, with the buffer memory 27 having a large storage capacity,
The disc 32 is played back.

After that, replace f'! of the disk 32! At T9, the write control signal W2 is no longer generated and digitized data is no longer written to the buffer memory 27.

At this time, since the read control signal R2 continues to be generated at a constant cycle, the digitized data continues to be read out sequentially from the buffer memory 27, so that the storage capacity of the buffer memory 27 is sequentially reduced. Become.

Then, during the period TIO when the recording medium exchange is completed, writing III! The II signal @W2 is generated at regular intervals, and writing of digitized data to the buffer memory 27 is started.

Therefore, after replacing the disk 32, the buffer memory 2
The disc 32 is played back in a stable state where the storage capacity of the disc 7 is small.

Note that this invention is not limited to the above-mentioned embodiments, and can be implemented in various ways without departing from the scope of the invention.
can do.

[Effects of the Invention] Therefore, as detailed above, according to the present invention, it is possible to prevent data from being interrupted even while changing the recording medium, and to achieve extremely good digital recording and playback that enables continuous recording and continuous playback. equipment can be provided.

[Brief explanation of the drawing]

1 and 2 are block configuration diagrams showing an embodiment of the digital recording/reproducing apparatus according to the present invention, and FIGS. 3 and 4 are timing diagrams and timing charts for explaining the operation of the embodiment, respectively. 5 and 6 are block configuration diagrams showing a modification of the same embodiment, respectively, FIGS. 7 and 8 are timing diagrams for explaining the operation of the modification, and FIG.
The figure is a block diagram showing a conventional digital recording and reproducing system. 11... Input terminal, 12... A/D conversion circuit, 13
... Modulation circuit, 14 ... Magnetic tape, 15 ... Demodulation circuit, 16 ... D/A conversion circuit, 17 ... Output terminal, 18 ... Input terminal, 19 ... A/ D conversion circuit,
20... Buffer memory, 21° 22... Control terminal, 23... Modulation circuit, 24... Output terminal, 25...
- Input terminal, 26... Demodulation circuit, 27... Buffer memory, 28, 29... Control terminal, 30... D/A
Conversion circuit, 31... Output terminal, 32... Disk,
33... Disk motor, 34... Input terminal, 35
...Output terminal. Applicant's representative Patent attorney Takehiko Suzue Figure 5 Figure 7 Figure 6 -T7 1Ta --Go T9-1 "--T+Exit-(
b)

Claims (1)

[Claims] A digital recording/reproducing apparatus comprising a recording means for converting an information signal into digitized data and recording it on a recording medium, and a reproducing means for reading the digitized data from the recording medium and reproducing it into the original information signal. a first storage/reproducing means for sequentially writing the digitized data into a first buffer memory, reading the digitized data from the first buffer memory in the order in which they were written, and recording the digitized data on the recording medium; , stopping reading of the digitized data from the first buffer memory during the exchange period of the recording medium, and accumulating the digitized data in the first buffer memory; and when the exchange of the recording medium is completed; a first control means for starting reading of the digitized data from the first buffer memory, causing the reproduction means to sequentially write the digitized data into a second buffer memory;
a second storage/reproduction means for reading the digitized data from the second buffer memory in the order in which they were written; and stopping writing of the digitized data to the second buffer memory during a period of time when the recording medium is replaced; reading out and reproducing the digitized data stored in the second buffer memory, and starting writing the digitized data into the second buffer memory when the recording medium has been exchanged; 2. A digital recording and reproducing device characterized in that it is further equipped with a control means according to item 2.