JPH0998370A - Video recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a simple switcher function by easily re-adjusting a video system even when the result of adjustment of the video system at a reproduction side is deviated in the device integrating two sets of digital VTRs each having an interface for compressed digital signals in its inside. SOLUTION: A non-compression digital component signal reproduced by a digital reproduction circuit 2 is recorded on a 2nd tape 12 by a digital recording circuit 11 via a 2nd changeover circuit 10 usually. When the result of adjustment, of the video system for a digital signal recorded on a 1st tape 1 is deviated, the signal is converted into a D/A converter 3 and the video system is adjusted by an encode circuit 4. The adjusted reproduced video signal is recorded on the 2nd tape 12 via a 1st changeover circuit to the digital recording circuit 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video recording / reproducing apparatus capable of editing two digital video tape recorders as one set.

[0002]

2. Description of the Related Art In recent years, digital compression recording has become possible even in video recording / reproducing devices, especially video tape recorders (hereinafter abbreviated as VTRs). Along with this, at the time of dubbing and editing, the compressed digital signal is directly internally interfaced from the reproducing side to the recording side, thereby making it possible to prevent deterioration of image quality.
A device with two Rs in one set has come into consideration.

[0003]

However, in the above-mentioned conventional video recording / reproducing apparatus, in order to interface the compressed digital signal as it is, the luminance signal level, the setup level of the compressed digital video signal reproduced from the reproducing side, It is difficult to make adjustments such as the color signal level, hue, and timing adjustment between the luminance signal and the color signal, and the signal levels of the video signal externally input to the recording side and the video signal reproduced from the reproducing side are gradually changed. There is a problem that it is very difficult to provide a simple switching function such as a crossfade that changes and switches to.

The present invention solves the above-mentioned problems. The compressed digital signal is once converted back to an analog signal, the video system can be adjusted by an existing analog signal encoding circuit, and the adjusted video signal is used as an apparatus. By internally interfacing from the playback side to the recording side and providing the recording side with a circuit that switches between the externally input video signal and the adjusted playback video signal, the playback video signal can be adjusted and the external video signal can be switched. It is an object of the present invention to provide a video recording / reproducing device that enables the above.

[0005]

In order to achieve the above object, a video recording / reproducing apparatus of the present invention comprises a digital reproducing circuit for reproducing a video signal digitally compressed and recorded on a first tape, and a digital reproducing circuit. By a D / A converter that performs digital / analog conversion of a video signal restored to an uncompressed digital component signal, an encoding circuit that encodes the video signal converted into an analog component signal by the D / A converter, and an encoding circuit A first switching circuit for switching and outputting an output video signal and a video signal input from a video input terminal; and a decoding circuit for decoding the video signal which is the output signal of the first switching circuit into an analog component signal. , Digitalize the analog component signal output by the decoding circuit A / D converter for conversion, a second switching circuit for switching and outputting the digital component signal output from the A / D converter and the digital component signal restored by the digital reproduction circuit, and output of the second switching circuit A digital recording circuit for compressing and recording a digital component signal, which is a signal, and a second tape for recording an output signal of the digital recording circuit are provided.

Further, the first switching circuit is characterized by gradually switching when switching between the video signal output from the encoding circuit and the video signal input from the video input terminal.

[0007]

In the video recording / reproducing apparatus having the above structure, the video signal digitally compressed and recorded on the tape is restored to the non-compressed digital component signal by the digital reproducing circuit and further converted to the analog component signal by the D / A converter. After that, the encoding circuit adjusts the video signal. Further, by providing a switching circuit for switching the video signal adjusted by the encoding circuit and the video signal input from the video input terminal, it is possible to adjust the reproduced video signal and switch the external video signal.

Further, the switching circuit gradually switches from the encoded output video signal to the video input signal, and gradually switches from the video input signal to the encoded output video signal, so that special switching can be easily performed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a video recording / reproducing apparatus according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 is a first tape, 2 is a digital reproducing circuit for reproducing a video signal digitally recorded on the first tape 1, and 3 is a digital reproducing circuit 2 for restoring an uncompressed digital component signal. A D / A converter for converting a video signal into a digital signal, an encoding circuit 4 for encoding the video signal converted into an analog component signal by the D / A converter 3, and a reference numeral 5 for the video signal output by the encoding circuit 4. A video output terminal for outputting, 6 a video input terminal, 7 a first switching circuit for switching and outputting a video signal output by the encoding circuit 4 and a video signal input from the video input terminal 6, and 8 a first A decoding circuit for decoding the video signal, which is the output signal of the switching circuit 7, into an analog component signal, and 9 is a decoding circuit. A / D converter 10 for converting the analog component signal output from the digital circuit 8 into a digital signal is switched between the digital component signal output from the A / D converter 9 and the digital component signal restored by the digital reproduction circuit 2. A second switching circuit for outputting, 11 is a digital recording circuit for compressing and recording the digital component signal which is the output signal of the second switching circuit 10, and 12 is a second tape for recording the output signal of the digital recording circuit 11. .

The uncompressed digital component signal reproduced by the digital reproducing circuit 2 is normally switched by the second switching circuit 10 and dubbed and edited on the second tape 12 by the digital recording circuit 11. It However, when the adjustment of the video system of the digital signal recorded on the first tape 1 is deviated, the digital signal is returned to analog by the D / A converter 3, and the luminance signal level, setup level, Adjustments such as the level and hue of the color signal and the timing matching between the luminance signal and the color signal are made. The adjusted reproduced video signal is switched by the first switching circuit 7, passes through the decoding circuit 8 and the D / A circuit 9, is switched by the second switching circuit, and is switched by the digital recording circuit 11 to the second tape 12. It is recorded on the upper side (the output signal of the encoding circuit 4 is recorded on the path of reference numerals 7 to 12).

As described above, according to the video recording / reproducing apparatus of the present embodiment, even if the video system on the reproducing side is out of adjustment in the apparatus having the digital interface inside, the video system can be easily reproduced. The effect is that adjustments can be made. A second embodiment of the present invention will be described below with reference to the drawings. It should be noted that components having the same functions as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

FIG. 2 is a block diagram of a video recording / reproducing apparatus according to the second embodiment of the present invention. In FIG. 2, the internal structure of the first switching circuit 70 is different from that of the first embodiment, 20 is a level control circuit for controlling the level of the encoded output video signal output by the encoding circuit 4, and 21 is a video. A level control circuit for controlling the level of the video input signal input from the input terminal 6, and an adder circuit 22 for adding the outputs of the level control circuits 20, 21.

As described above, according to the video recording / reproducing apparatus of this embodiment, the output level of each of the encoded output video signal level control circuit 20 and the input video signal level control circuit 21 is controlled, and the addition circuit is added. By adding each video signal whose level is controlled by 22, the encoded output video signal is gradually switched to the video input signal, and the video input signal is gradually switched to the encoded output video signal. This has the effect of enabling special switching.

[0014]

As is apparent from the above description, according to the video recording / reproducing apparatus of the present invention, the uncompressed digital component signal reproduced by the digital reproducing circuit is
The adjustment of the video system on the reproducing side was misaligned by having the second switching circuit for digital interface and the first switching circuit for returning to analog and passing through the encoding circuit and then analog interface. Also in this case, the effect that the video system can be easily readjusted can be obtained.

Further, by providing the first switching circuit with a circuit for controlling and adding the output levels of the level control circuit for the encoded output video signal and the level control circuit for the input video signal, the encoded output video signal is added. It is possible to easily perform special switching such as gradually switching from the video input signal to the video input signal or gradually switching from the video input signal to the encoded output video signal.

[Brief description of drawings]

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

FIG. 2 is a block diagram of a video recording / reproducing apparatus according to a second embodiment of the present invention.

[Explanation of symbols]

 1 First Tape 2 Digital Playback Circuit 3 D / A Converter 4 Encoding Circuit 5 Video Output Terminal 6 Video Input Terminal 7 First Switching Circuit 8 Decoding Circuit 9 A / D Converter 10 Second Switching Circuit 11 Digital Recording Circuit 12 Second tape 20, 21 Level control circuit 22 Adder circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H04N 5/92 H04N 5/91 L 5/92 H

Claims (2)

[Claims] 1. A digital reproduction circuit for reproducing a video signal digitally compressed and recorded on a first tape, and D for converting a video signal restored to an uncompressed digital component signal by the digital reproduction circuit into a digital signal. An A / A converter, an encoding circuit that encodes a video signal converted into an analog component signal by the D / A converter, a video signal output by the encoding circuit, and a video signal input from a video input terminal. A first switching circuit that switches and outputs, a decoding circuit that decodes a video signal that is an output signal of the first switching circuit into an analog component signal, and an analog component signal that is output by the decoding circuit is converted into a digital signal. A / D converter and the A
A second switching circuit for switching and outputting the digital component signal output from the A / D converter and the digital component signal restored by the digital reproduction circuit; and compressing the digital component signal output from the second switching circuit. A video recording / reproducing apparatus comprising a digital recording circuit for recording and a second tape for recording an output signal of the digital recording circuit. 2. The video according to claim 1, wherein the first switching circuit gradually switches when switching between the video signal output from the encoding circuit and the video signal input from the video input terminal. Recording / playback device.