JPH02203469A - Recording device and reproducing device - Google Patents

Abstract

PURPOSE:To attain the continuous recording operations with no interruption caused by the exchange of recording media by using a recording medium and a buffer memory. CONSTITUTION:The input signals obtained within an exchange period of a recording medium 104 are stored in a buffer memory 102 and never lost. At the same time, the signals are read out of the memory 102 and recorded at a rate higher than the input of the memory 102, i.e., at a high speed until the prescribed number of idle areas are secured in the memory 102 after the exchange of the medium 104 is through. Thus it is possible to avoid such an inconvenient case where the memory 102 is overflowed and the signals to be recorded are partly lost. As a result, the signals to be recorded can be continuously recorded with no interruption despite the exchange of the medium 104.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for recording audio signals, video signals, etc. that does not cause omissions of recording signals due to exchange of recording media, etc. when continuously recording audio signals, video signals, etc. over a plurality of recording media. The present invention relates to an apparatus and a reproducing apparatus that does not cause interruption of reproduction signals due to exchange of recording media or the like when continuously reproducing a plurality of recording media.

Conventional technology Conventionally, long-term recording exceeding the maximum recording time of the recording medium,
Regeneration was performed using the following two methods. The first method is to operate a plurality of recording devices or playback devices alternately, and the second method is to replace the recording medium in one recording device or playback device.

Problems to be Solved by the Invention The first conventional method described above is complicated to operate because it requires multiple devices, and is expensive because it requires a function to synchronize multiple devices during playback. There are issues such as becoming Furthermore, the second conventional method has the problem that the input signal cannot be recorded or the reproduction and output of the signal is interrupted during the exchange period of the recording medium.

The present invention aims to solve the problems of the prior art.

Means for Solving the Problems The present invention includes a buffer memory into which an input signal to be recorded is input, and a recording means for recording the output signal of the buffer memory on a recording medium, and the recording medium is not recorded by exchanging the recording medium or the like. During a period in which writing is not possible, only writing to the buffer memory is performed, and during a period in which recording to the recording medium is possible, writing is performed at a higher rate than the input to the buffer memory until the buffer memory secures a predetermined amount of free space. This is a recording device characterized by reading and recording data from a buffer memory.

The present invention also provides a reproduction means for reproducing a signal from a recording medium, and a buffer memory that receives the output signal of the reproduction means and reads it out at a predetermined rate to obtain a reproduction signal, and the present invention provides a buffer memory for reproducing a signal from a recording medium. During a period in which reproduction is not possible, only reading from the buffer memory is performed, and during a period in which reproduction from the recording medium is possible, reproduction is performed at a rate higher than the output of the buffer memory until the amount of signal accumulation in the buffer memory reaches a predetermined amount. This is a playback device characterized by writing data into a buffer memory.

Function: With the above-described configuration, the recording apparatus of the present invention stores signals input during the recording medium exchange period in the buffer memory, so that the signals are not lost, and after the recording medium exchange is completed,
Signals are read out and recorded from the buffer memory at a higher rate than the input to the buffer memory, i.e. at high speed, until a predetermined amount of free area in the buffer memory is secured (storage capacity that can store input signals for longer than the time required to replace the recording medium). This prevents the buffer memory from overflowing and causing part of the signal to be recorded to be lost. Therefore, even if the recording medium is replaced, the signal to be recorded can be recorded continuously without interruption.

With the above-described configuration, the playback device of the present invention has a rate higher than the input of the buffer memory until the playback signal is stored in the buffer memory for a predetermined amount of time (ie, the playback signal is stored for a period longer than the time required for exchanging the recording medium). In other words, since the signal is read out from the recording medium at high speed, reproduced, and written to the buffer memory, the reproduced signal is stored in the buffer memory longer than the time required to exchange the recording medium, and during the period of exchanging the recording medium, the reproduction signal is stored in the buffer memory. Even if a reproduced signal cannot be obtained from the reproducing means, uninterrupted signal reproduction can be performed by using the output of the buffer memory as the output of the reproducing device.

Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a recording apparatus in an embodiment of the present invention.

In FIG. 1, 101 is an input terminal for a digital audio signal, 102 is a first-in-first-out type buffer memory, 103 is a recording means, 104 is a recording medium, and 10
5 is a recording medium exchange means.

Regarding the recording device of this embodiment configured as described above,
The operation will be explained below.

Digital audio signal (sample rate 481 (H)
z, word length 16 bits) is input to the recording means 103 from the terminal 101 via the buffer memory 102, and is stored on the recording medium 1.
04 (disc).

The buffer memory 102 outputs an empty signal when a predetermined amount of free space is secured, and the recording medium exchanging means 105 outputs a busy signal during the exchanging period of the recording medium 104.

When the empty signal is inputted to the recording means 103, the input signal rate (48kHz) is set at the terminal 1010.
reads the signal from the buffer memory and records it, and if the empty signal is not input, the signal is read from the buffer memory 102 at a higher rate (49kHz) than the input signal of the terminal 101 until the empty signal is input again. , recording medium lO4 faster than usual (49/4
Recording is performed while rotating (at 8x speed). Therefore, a predetermined amount of free space is usually reserved in the buffer memory 102.

When recording on the recording medium 104 is completed, the recording medium exchanging means 105 exchanges the recorded medium 104 with another recordable recording medium 104. The recording means 103 detects that the recording medium 104 is being replaced by the busy signal and stops recording. Buffer memory 102 is only used for writing, and digital audio signals are transferred to buffer memory 1.
It is stored in 02.

If the time required to replace the recording medium 104 is 3 seconds, the total information of the digital audio signal input during this period is approximately 2.5 seconds. Since it is 3Mbit (-16X48kX3), there is more free space than this in the buffer memory 10.
2, the input digital audio signal will not be lost during the replacement period of the recording medium 104. The predetermined amount in this embodiment is 2.3 Mbit or more.

Since the free area is reduced due to the accumulation of input signals during the recording medium exchange, it is necessary to secure a predetermined amount of free area in preparation for the next recording medium exchange.

When the free area decreases, the buffer memory 102 no longer outputs an empty signal. Therefore, the recording means 103 is operated at a high rate (49kHz) until an empty signal is input.
In step 2), reading and recording from the buffer memory 102 are performed. Writing to the buffer memory 102 is normal.
48kHz,), and the readout is at a high ray) (49kHz).
kH2), so the difference rate (1kH,)
The digital audio signal stored in the buffer memory 102 decreases. A predetermined amount of free space is secured in the buffer memory 104, and an empty signal is output when preparation for the next recording medium exchange is completed. Therefore, the buffer memory 102 starts outputting an empty signal approximately 144 seconds (=3×48 ÷lk) after the recording medium exchange is completed. The recording means 103 detects the empty signal and starts reading and recording data from the buffer memory 102 at a normal rate.

As described above, according to this embodiment, the buffer memory 102 is provided before the recording means 103, and the buffer memory 102
By reading out and recording from the buffer memory at a high rate until a predetermined amount of free area is secured, even if the recording medium is replaced, part of the input signal to be recorded will not be lost. Recording can be performed continuously.

Furthermore, by using the buffer memory 102 as a mere delay line at the start of recording, the function of starting recording retroactively within the delay time can be realized without adding any special circuits.

FIG. 2 is a block diagram showing the configuration of a playback device in one embodiment of the present invention.

In FIG. 2, 201 is a recording medium, 202 is a recording medium exchanging means, 203 is a reproduction means, and 204 is a first in/first out (first in/first out).
ut) type buffer memory 205 is an output terminal for a reproduced signal.

The operation of the reproducing apparatus of this embodiment configured as described above will be described below.

The digital audio signal recorded on the recording medium 201 (disk) is reproduced by the reproduction means 203,
Normal signal format (sample rate 48kHz, e word length 16 bits) from terminal 205 via buffer memory 204
is output.

The buffer memory 203 outputs a full signal when a predetermined amount of reproduction signals are stored, and the recording medium exchange means 202 outputs a busy signal during the recording medium exchange period.

When the full signal is input to the reproducing means 203,
Playback is performed at the normal rate (48kHz), and when the full signal is not input, the recording medium 201 is rotated at a higher speed than normal (49/48 times the speed) and the recording medium 201 is rotated at a high rate (48kHz).
9kHz,) and write the obtained reproduced signal to the buffer memory 204.

Therefore, a predetermined amount of reproduction signals are normally stored in the buffer memory 204.

When the reproduction of the recording medium 201 is completed, the recording medium exchanging means 2
02 replaces the reproduced recording medium 201 with the next recording medium 201 to be reproduced subsequently. The reproducing means 203 detects that the recording medium 201 is being replaced by inputting a busy signal and stops reproducing. Only reading is performed from the buffer memory 204, and the data is output from the terminal 205.

If the time required to replace the recording medium 201 is 3 seconds, the total amount of information of the digital audio signal output between the devices is approximately 2. 3Mbit (= 16X48k
3) Therefore, as long as more reproduced digital audio signals are stored in the buffer memory 204, the digital audio signals from the buffer memory will not be interrupted even while the recording medium 201 is being replaced. The predetermined amount in this embodiment is 2.3 Mbit or more.

Since the reproduced signal stored in the buffer memory 204 is read out and reduced during the recording medium exchange period, the buffer memory 204 no longer outputs a full signal. For this reason, the reproducing means 203 does not operate on the recording medium 200 until the full signal is input.
Rotate at high speed (49/48 times) to achieve high speed (49/48 times).
Regeneration is performed at 1cH,). Writing to the buffer memory 204 is performed at a high rate (49kHz), and reading is performed at a normal rate (48kHz), so
The digital audio signal reproduced at the difference rate (1 kHz) is stored in the buffer memory 204 in preparation for the next recording medium exchange. The buffer memory 204 outputs a full signal when a predetermined amount of storage is secured. Therefore, it took about 144 seconds after the recording medium exchange was completed (=3X48 ÷I
After k)', the buffer memory 204 starts outputting a full signal. The reproducing means 203 detects a full signal and starts reproducing and writing into the buffer memory 204 at a normal rate.

As described above, according to this embodiment, the buffer memory 204 is provided after the reproducing means 203, and the buffer memory 204
plays at a high rate until a predetermined amount of playback signal is accumulated in the
By writing to the buffer memory, even if signal reproduction is interrupted due to replacement of the recording medium, the reproduced signal stored in the buffer memory 204 can be continued to be read out, and there will be no interruption in output of the reproduced signal.

In the description of the above two embodiments, numerical values and targets have been specifically shown, but the present invention is not limited to these. For example, the target signal may be a video signal or a processed signal thereof, and the recording medium may be a cassette tape. Also, the high rate is 491 (Hz), but 48.1kHz,
It is also possible to close it. This high rate can be close to the normal rate, so special recording or playback means are not necessarily required, and basically it is not necessary to make conventional recording and playback devices operate at a high rate. All you need to do is add a circuit and a buffer memory.

Of course, the recording format on the recording medium may be the same as the conventional one. It is only necessary that the free area and storage capacity in the buffer memory be secured before the next medium exchange, and it is not necessarily necessary to operate the recording means and the reproducing means at a high rate immediately after the medium exchange is completed. Further, the buffer memory 102 in the recording device and the buffer memory 204 in the reproducing device can be shared. When the target signal is a video signal, the playback buffer memory 204 can also be used as a special playback memory. Furthermore, the present invention is applicable not only to digital recording devices but also to analog recording devices. Furthermore, the recording medium can also be replaced manually.

By the way, in the above-mentioned embodiment, the recording device is provided with a buffer memory before the recording means, but it is also possible to divide the recording means into two parts and provide a buffer memory between them. However, by redefining the circuits and devices after the buffer memory (even if it is only a recording head) as recording means, and redefining the input signal of the buffer memory as a new input signal to be recorded, this example is explained. Since these configurations can be converted to other configurations, the explanation of these configurations will be omitted. The same applies to playback devices.

In a recording device or a reproducing device that compresses and records the amount of information, the size of the buffer memory can be made smaller if the buffer memory is provided at a position closer to the recording medium.

As described in detail, according to the present invention, even if recording and playback are performed while sequentially replacing a plurality of recording media, continuous recording can be performed without any interruption in recording or playback due to the replacement of recording media. , regeneration can be performed, and its practical value is great.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a recording apparatus according to a first embodiment of the invention, and FIG. 2 is a block diagram of a reproducing apparatus according to a second embodiment of the invention. 101... Input terminal, 102... Buffer 7 memo 18 103... Recording means, 104... Recording medium, 10
5... Recording medium exchange means, 201 recording medium, 202.
...Recording medium exchange means, 203...Reproduction means, 204
...Buffer memory, 205...Output terminal. Input terminal n1 ULL usy

Claims (2)

[Claims] (1) A buffer memory into which an input signal to be recorded is input, and a recording means for recording an output signal of the buffer memory on a recording medium; during a period in which recording to the recording medium is possible, reading and recording from the buffer memory at a higher rate than input to the buffer memory until a predetermined amount of free area is secured in the buffer memory. A recording device characterized by: (2) comprising a reproducing means for reproducing a signal from a recording medium, and a buffer memory receiving the output signal of the reproducing means and reading it out at a predetermined rate to obtain a reproduced signal; During the possible period, only reading from the buffer memory is performed, and during the period when reproduction from the recording medium is possible, reproduction is performed at a higher rate than the output of the buffer memory until the amount of accumulated signals in the buffer memory reaches a predetermined amount; A playback device characterized by writing to a buffer memory.