JPH10145727A - Recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record from a prior scene to a desired scene by providing a memory means for storing a signal for a prescribed time, recording a signal stored in the memory means to a recording means and storing the signal for the prescribed time before performing the recording operation. SOLUTION: A received video and audio signals for television broadcasting are supplied to an input terminal 1. Then, this video and audio signals supplied to the input terminal 1 is supplied to a recording means 4 through a distributor 2 and a switch 3. Then, a reproducing signal from this recording means 4 is taken out to an output terminal 5. At the same time, the video and audio signals are always supplied to a memory means 6 by the distributor 2. Then, the video and audio signals stored in this memory means 6 are supplied to the recording means 4 through the switch 3. Then, the operations of the switch 3 and the recording means 4 are controlled by a control microcomputer 100 for example. Then, a recording operating switch 7 for operating recording start and its display means 8 are connected to this microcomputer 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus suitable for use in recording a television broadcast, for example.

[0002]

2. Description of the Related Art For example, there are cases where it is desired to record a scene while watching a television broadcast. However, in a conventional VTR device, for example, recording is started after a recording operation is performed. Therefore, for example, even if a recording operation is performed after watching a scene to be recorded during viewing of a television broadcast, Only the scene after that scene was recorded.

On the other hand, for example, in a monitoring VTR, a recording medium is circulated and recording is always performed, and recording is stopped when an event to be recorded occurs. ing. As a result, the recording of the video signal and the like for the time required for the circulation of the recording medium before the occurrence of the event can be left.

However, this device requires a special configuration such as circulating a recording medium, and it is difficult to apply the device to, for example, a general VTR device. Further, when the recording medium is a magnetic tape or the like, there is a problem of deterioration due to repeated recording, which causes problems in terms of operability for frequently changing the recording medium and economy.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and the problem to be solved is that, in a conventional general device, for example, while watching a television broadcast, Even if a recording operation is performed after looking at a scene that the user wants to record, only the scene after that scene is recorded.

[0006]

According to the present invention, a storage means for storing a signal for a predetermined time is provided, and the signal stored in the storage means is recorded in the recording means. According to this, a signal for a predetermined time before the recording operation is performed can be stored, and recording can be performed from a scene before the desired scene, and the desired scene can be reliably recorded.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, recording means for recording a video signal and storage means for storing a predetermined time of the video signal are provided. Then, a video signal delayed by a predetermined time is taken out, and the video signal stored in the storage means is recorded in the recording means by the recording start operation.

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an example of a recording apparatus to which the present invention is applied. That is, in FIG. 1, an input terminal 1 is supplied with, for example, a television broadcast video and audio signal received by a receiver (not shown). The video and audio signals supplied to the input terminal 1 are
And recording means (for example, VT) through the changeover switch 3
R device) 4. Further, a reproduced signal from the recording means 4 is taken out to an output terminal 5.

At the same time, the distributor 2 constantly supplies video and audio signals to the storage means 6. Then, the video and audio signals stored in the storage means 6 are supplied to the recording means 4 through the changeover switch 3. Further, the operations of the changeover switch 3 and the recording means 4 are controlled by, for example, a control microcomputer 100.
Further, a recording operation switch 7 for performing a recording start operation and a display means 8 thereof are connected to the microcomputer 100.

That is, in this apparatus, as shown in FIG. 2, for example, a push button type recording operation switch 7 is provided on the operation unit, and a display means comprising a light emitting diode or a fluorescent display tube for indicating that recording is in progress. 8
Is provided. When the recording operation switch 7 is operated, for example, the microcomputer 100
The changeover switch 3 and the recording means 4 are controlled through the control means, and, for example, the video and audio signals stored in the storage means 6 are recorded in the recording means 4.

Accordingly, in this apparatus, a recording means 4 for recording a video signal and a storage means 6 for storing a predetermined time of the video signal are provided. The storage means 6 always stores the input video signal. A video signal delayed by a predetermined time is extracted, and the video signal stored in the storage means 6 is recorded in the recording means 4 by a recording start operation (recording operation switch 7).

Further, in this apparatus, a specific configuration of the storage means 6 is, for example, as shown in FIG. That is, in FIG. 3, a video signal of a television broadcast received by, for example, a receiver (not shown) is supplied to the input terminal 11. Then, the video signal supplied to the input terminal 11 is taken out to the output terminal 14 connected to the recording means 4 through the distributor 12 and the changeover switch 13.

At the same time, the video signal supplied to the input terminal 11 is supplied to the A / D conversion circuit 15 by the distributor 12. The video signal digitized by the A / D conversion circuit 15 is, for example, a JPEG (Joint Ph
The compressed digital video signal is supplied to a video signal compression circuit 16 defined by an otographic Expert Group, and is supplied to a random access memory (RAM) 17 for storage.

Further, the digital video signal read from the RAM 17 is supplied to the decompression circuit 18 paired with the above-mentioned compression circuit 16, and the decompressed digital video signal is supplied to the D / A
It is supplied to a conversion circuit 19. Then, the video signal analogized by the D / A conversion circuit 19 is supplied to the above-described changeover switch 13. The changeover switch 13
The operation of the RAM 17 is controlled by, for example, a control microcomputer 100.

In this apparatus, the operation of the above-described compression circuit 16 and expansion circuit 18 is performed, for example, in accordance with a control signal from a control microcomputer 100 in accordance with JPEG.
It is controlled by the control circuit 20.

That is, for example, in the JPEG system, for example, a raster-scanned video signal of a television broadcast is converted into an 8 × 8 pixel block. Each block is subjected to discrete cosine transform and rearranged in the order of data size. Further, zigzag scanning is performed on the rearranged pixel blocks, and compression is performed on the scanned data by Huffman encoding. The compression processing so far is lossless compression.

Here, for example, according to the CCIR601 format, the number of pixels of the effective screen is 640 × 480 pixels, the number of bits of each data is 8 bits, and the weighting of the luminance (Y) and color difference (U / V) signals is Y: U: V = 4:
Assuming that 2: 2, the data amount of the video signal of one frame is Y = 640 × 480 × 8 bits U = 320 × 480 × 8 bits V = 320 × 480 × 8 bits, and the total is 4,915200 bits = 4800
kbit.

Therefore, lossy compression for thinning out data is further performed. That is, in this case, for example, if compression is reduced to １ ／ in consideration of image quality retention, the data amount is 4800 kbit × (１ ／) = 1200 kbit. The data transmission speed is 13.5 MHz × (１ ／) = 3.375 MHz ≒ 29, where the original clock frequency is 13.5 MHz.
6 nsec.

Further, for example, when the data is compressed to 1/8,
The data amount is 4800 kbit × (１ ／) = 600 kbit. The data transmission speed is 13.5 MHz × (1/8) = 1.875 MHz ≒ 5
93 nsec.

When it is attempted to store, for example, data for 5 seconds with respect to the video signal data thus compressed, for example, in 1/4 compression, 1.2 Mbit × 30 × 5 = 180 Mbit Minutes of random access memory (RAM) is required.

For example, in the case of 1/8 compression, 0.6 Mbit.times.30.times.5 = 90 Mbit of random access memory is required.

That is, by providing a random access memory having the storage capacity calculated as described above as the memory 7, the memory 7 in the above-described apparatus is provided.
For example, video signals for 5 seconds can be stored. Note that the decompression of the compressed data is performed by any interpolation means for irreversible compression, and the data of the original digital video signal is restored by decoding the Huffman encoding process and inverse discrete cosine transform. is there.

In FIG. 3, for example, an audio signal of a television broadcast is supplied to an input terminal 21. Then, the audio signal supplied to the input terminal 21 is
And output to the output terminal 24 connected to the recording means 4 through the changeover switch 23. At the same time, the audio signal supplied to the input terminal 21 by the distributor 22 is A
/ D conversion circuit 25. Then, the audio signal digitized by the A / D conversion circuit 25 is stored.

The storage of the audio signal can be performed as it is because the data amount is relatively small. That is, the data amount of the audio signal is, for example, about 10 Mbit for 6 seconds. However, when a longer storage time is required or when the storage capacity of the memory is to be reduced, for example, ATRAC (Adaptive Transform) used in a mini disk is used.
Acoustic coding) can be used to compress the data.

FIG. 3 shows a case where data is compressed using the ATRAC method.
The digitized audio signal from the / D conversion circuit 25 is A
The compressed digital audio signal is supplied to the TRAC compression circuit 26 and supplied to the random access memory (RAM) 28 through the memory control circuit 27 and stored therein. The compression of the data amount by the ATRAC method is 1 /
5

The digital audio signal read from the RAM 28 is supplied to the decompression circuit 29 paired with the compression circuit 26, and the decompressed digital audio signal is supplied to the D / A conversion circuit 30. The video signal analogized by the D / A conversion circuit 30 is supplied to the changeover switch 23 described above. The operations of the changeover switch 23 and the control circuit 27 are controlled by, for example, the control microcomputer 100 so as to be synchronized with the above-described video signal.

Therefore, in this apparatus, a storage means for storing a signal for a predetermined time is provided, and the signal stored in the storage means is recorded in the recording means, thereby storing the signal for a predetermined time before the recording operation is performed. Thus, recording can be performed from a scene before the desired scene, and the desired scene can be reliably recorded.

As a result, in the conventional apparatus, for example, even if a recording operation is performed after watching a scene to be recorded while watching a television broadcast, only the scene after the scene is recorded. According to the present invention, a recording that has a point can be performed from a scene before a desired scene, and the desired scene can be reliably recorded.

In the above-described apparatus, when the supplied input signal is digital, for example, the A / D
After the conversion circuits 15, 25, the digital input terminals 31, 32
And a digital signal can be supplied. Also, the digital output terminal 3 is provided before the D / A conversion circuits 19 and 30.
By providing 3, 34, digital signals can be extracted. However, in this case, the format of the supplied digital signal needs to match the output of the A / D conversion circuits 15 and 25.

In the above-described apparatus, when a recording stop operation is performed, it is necessary to delay the actual stop operation by the time during which the data is stored in the storage unit 6.
That is, in the above-described device, the input signal is simply delayed and extracted from the storage means 6, and therefore, it is necessary to delay the actual stop operation by the time of the delay.

On the other hand, for example, when extracting a signal from the storage means 6 described above, for example, a video signal is extracted and decimated for each arbitrary frame or field, and an audio signal is also decimated and extracted at an arbitrary timing. Thus, the above-described delay time can be gradually eliminated.

Thus, for example, when recording is performed while watching, the signal taken out through the storage means 6 catches up in real time, and the above-mentioned uncomfortable feeling due to the delay of the actual stop operation can be eliminated. By this, after the signal has caught up in real time, the signal recorded by the recording means 4 is switched to a signal without compression / expansion by switching the switch 3 so that the image quality and sound quality are not deteriorated by the compression / expansion. Signal recording can be performed.

Thus, according to the recording apparatus described above, the recording means for recording the video signal and the storage means for storing the video signal for a predetermined time are provided, and the storage means always stores the input video signal. The video signal delayed by a predetermined time is taken out, and the video signal stored in the storage means is recorded in the recording means by the recording start operation, so that recording can be performed from a scene before a desired scene. It is possible to reliably record a desired scene.

[0034]

According to the present invention, the storage means for storing the signal for the predetermined time is provided, and the signal stored in the storage means is recorded in the recording means, thereby storing the signal for the predetermined time before the recording operation is performed. The signal can be stored, and recording can be performed from a scene before the desired scene, and the desired scene can be reliably recorded.

Thus, in the conventional apparatus, for example, even if a recording operation is performed after watching a scene to be recorded while watching a television broadcast, only a scene after the scene is recorded. According to the present invention, a recording that has a point can be performed from a scene before a desired scene, and the desired scene can be reliably recorded.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an example of a recording apparatus to which the present invention is applied.

FIG. 2 is a diagram for explaining the operation.

FIG. 3 is a configuration diagram of an example of a main part of a recording apparatus to which the present invention is applied.

[Explanation of symbols]

1 input terminal, 2 distributor, 3 switch, 4
Recording means, 5 output terminals, 6 storage means, 7 recording operation switches, 8 display means, 100 control microcomputer, 11 input terminals, 12 distributor, 13
Changeover switch, 14 output terminal, 15 A / D conversion circuit, 16 JPEG compression circuit, 17 random access memory, 18 decompression circuit, 19 D / A conversion circuit, 20 JPEG control circuit, 21 input terminal, 22 distributor, 23 Changeover switch, 24 output terminals, 25
A / D conversion circuit, 26 ATRAC compression circuit,
27 memory control circuit, 28 random access memory, 29 decompression circuit, 30 D / A conversion circuit, 31, 32
Digital input terminal, 33, 34 Digital output terminal

Claims (6)

[Claims] 1. A recording means for recording a video signal, and a storage means for storing a predetermined time of the video signal, wherein the input video signal is always stored in the storage means for the predetermined time. A recording apparatus, wherein a delayed video signal is taken out, and the video signal stored in the storage means is recorded in the recording means by a recording start operation. 2. The recording apparatus according to claim 1, wherein the input video signal is compressed, stored, decompressed, and extracted from said storage means. 3. The recording apparatus according to claim 1, wherein when the video signal stored in the storage unit is recorded in the recording unit by the recording start operation, the video signal after the recording stop operation is performed. A recording apparatus, wherein the recording means is stopped after a lapse of a predetermined time. 4. The recording device according to claim 1, wherein when the video signal stored in the storage unit is recorded in the recording unit by the recording start operation, the stored video signal is transmitted to an arbitrary frame or an arbitrary frame. A recording apparatus characterized in that the delay for the predetermined time is gradually eliminated by thinning out and taking out each field. 5. The recording apparatus according to claim 1, further comprising audio storage means for storing said video signal and said audio signal for said predetermined time, wherein said input audio signal is always stored in said audio storage means. An audio signal delayed by the predetermined time, and an audio signal stored in the audio storage means is recorded in the recording means together with the video signal by a recording start operation. 6. The recording apparatus according to claim 5, wherein the audio signal input to the audio storage means is compressed, stored, decompressed, and extracted.