JPS6390286A - Recording and reproducing device for color video signal - Google Patents

Abstract

PURPOSE:To record without separating a brightness/chroma at the time of dubbing or photographing by a camera by providing a component signal input terminal to a recording system, and providing a component signal output terminal to a reproducing system, and directly inputting and outputting the component signal. CONSTITUTION:Since the component signal input terminals 32a-32c and the output terminals 31a-31c are respectively provided to the recording system 1 and the reproducing system 2, a reproducing component signal is directly inputted and recorded on a magnetic tape 3 at the time of dubbing by the use of a reproducing machine and a recording machine. Therefore, the separation of the brightness/chroma may not be carried out, so that the phase and frequency characteristics of a luminance signal are not deteriorated, nor the phase of a carrier chrominance signal is distored nor inconvenience is produced, but a satisfactory dubbing can be performed. Since the component signal can be directly inputted, a peripheral equipment for outputting the component signal, for instance, a special effect device for inserting a date or a title or the like on a recorded picture or a personal computer can be directly connected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color video signal recording and reproducing device, and is particularly suitable for configuring a recording and reproducing system using component signals.

[Summary of the invention]

By providing an output terminal for component color video signals in the playback system and an input terminal for component color video signals in the recording system, it is possible to record and monitor without performing brightness/chroma separation processing in the recording system or monitor. This is a high-quality, highly versatile color video signal recording and reproducing device that prevents image quality deterioration and allows direct connection to video equipment such as special effects equipment.

[Conventional technology]

When recording a color video signal on a magnetic tape or the like, except for baseband recording, generally the luminance signal and chroma signal are separated and processed individually before recording. Also, in a color receiver, a luminance signal and a chroma signal are separated, color demodulated, and displayed on a picture tube. Therefore, the image quality tends to deteriorate when passing through the brightness/chroma separation circuit.Especially when dubbing is performed by combining two recording/reproducing devices, the reproduced signal that has deteriorated once will deteriorate again on the dubbing device side, so the image quality will deteriorate. Significant deterioration.

In order to minimize deterioration caused by dubbing, home VTRs are equipped with a dubbing output terminal that directly outputs the reproduced luminance signal and low-frequency converted chroma signal individually, and a dubbing input terminal that corresponds to these signals. A device equipped with such a structure is known (see Japanese Patent Publication No. 54-11099). When dubbing is performed using these dubbing output terminals on two TRs, image quality deterioration can be minimized because the dubbing machine does not pass through the brightness/chroma separation circuit.

[Problem that the invention seeks to solve]

The measures for preventing image quality deterioration known in the above-mentioned prior art are effective during dubbing, but are completely ineffective against image quality deterioration in color receivers.

Moreover, it has a drawback that its use for dubbing is limited and it cannot be used in a versatile manner.

In view of this problem, the present invention is not only effective in preventing image quality deterioration during dubbing, but also can improve image quality deterioration in color receivers, and can also be connected to video equipment other than VTRs, image processing equipment, etc. The purpose of the present invention is to provide an input/output terminal for image signals that is versatile with respect to connections between devices and whose standards can be easily standardized.

[Means for solving problems]

The color video signal recording and reproducing apparatus of the present invention separates the luminance signal and the carrier color signal of the input composite color video signal in the recording system, performs FM modulation on the luminance signal, and performs low frequency frequency modulation on the carrier color signal. On the other hand, in the reproduction system, the luminance component of the reproduced signal is FM demodulated, the carrier color component is converted to a high frequency, and the reproduced luminance signal and the reproduced carrier color signal are The configuration is such that the signals are synthesized and derived as a composite color video signal.

The recording system further includes an input terminal for a color video signal consisting of component signals, an input processing circuit that obtains a luminance signal and a carrier color signal from the input component signals, and switches the luminance signal and carrier color signal between a composite system and a component system. and a changeover switch for supplying signals to each of the FM modulation and low frequency conversion circuits.

The reproduction system also includes an output processing circuit that converts the reproduced luminance signal and the reproduced carrier color signal into component signals, and an output terminal for the component signals.

[Effect]

B-Y signal, R-Y signal, Y signal, R signal, G signal, B
Since the luminance signal and the carrier color signal are directly obtained and recorded from the input component color video signal consisting of the signal,
There is no image quality deterioration due to brightness/chroma separation processing. When dubbing, two recording and reproducing apparatuses are used, and a component signal is supplied from the reproducing apparatus to the recording apparatus for recording. There is very little deterioration in image quality due to dubbing. Furthermore, if component outputs are supplied to a color receiver, brightness/chroma separation processing becomes unnecessary and high image quality can be obtained. It is also possible to configure a recording/playback system by directly connecting video equipment equipped with input or output terminals for component signals.

〔Example〕

FIG. 1 is an overall block diagram of a magnetic recording and reproducing apparatus showing one embodiment of the present invention, which includes a recording system 1 and a reproducing system 2. As shown in FIG.

To explain the state in which the reproduction system 2 reproduces what is recorded on the magnetic tape 3, the reproduction output from the head 4 is supplied to the high-pass filter HPF5, and FM, ! i degree signal Y-F
M is extracted and supplied to the FM demodulator 6 for demodulation, and the demodulated output is supplied to the combiner 7.

The reproduced output from the head 4 is also supplied to a low-pass filter LPF8, and a carrier color signal C' that has been low-pass converted to a frequency of 688 kHz is extracted. This signal is supplied to the high frequency conversion circuit 9, where it is converted to the original frequency of 3.58 MHz, and sent to the synthesizer 7. Therefore, a reproduced color video signal NTSC is obtained at the composite output terminal 11 of the output of the synthesizer 7.

Next, to explain the recording system 1, the color video signal NTSC input from the composite input terminal 12 is Y/C.
It is supplied to the separation circuit 13. This Y/C separation circuit 13 is provided with a low pass filter (LPF) 14 and a band pass filter (BPF) 15. A luminance signal Y is taken out from the low pass filter 14, and this is applied to the changeover switch 16. The signal is supplied to the FM modulator 18 through the contact 16b and the contact 17b of the changeover switch 17 for FM modulation, and the modulated output is supplied to the synthesizer 21 through the high-pass filter (HPF) 20.

On the other hand, the input color video signal NTSC is also supplied to a band pass filter (BPF) 15, from which a carrier color signal C is taken out, which is applied to the contact 2 of the changeover switch 22.
688kHz is supplied to the low frequency conversion circuit 23 through 2b.
It is down-converted to the frequency of z. This low-pass converted carrier color signal C' is supplied to the synthesizer 21 through a low-pass filter (LPF) 24 and a contact 25a of a changeover switch 25, and is synthesized with the FM-modulated luminance signal Y-FM.

The combined output from the combiner 21 is then recorded on the magnetic tape 3 by the head 4.

In order to record the reproduced signal from the magnetic tape 3 onto another magnetic tape using another recording/reproducing device, dubbing signals are input from the output side of the FM demodulator 6 and the input side of the high frequency conversion circuit 9 of the reproduction system 2, respectively. Output terminals 26 and 27 are derived. The recording system 1 is also provided with dubbing input terminals 27 and 28 corresponding to the output terminals 26 and 27, and the luminance signal Y is supplied to the FM modulator 18 through the contact 17a side of the changeover switch 17, and the low frequency The reproduced carrier color signal C' in the converted state is directly supplied to the combiner 21 through the contact 25b of the changeover switch 25.

The playback system 2 side of the low frequency conversion type recording and playback device configured as described above includes component signal output terminals 31a and 31.
In addition, the recording system 1 is provided with component signal input terminals 32a, 32b, and 32C.

The component signal output terminals 31a to 31C are led out from an output processing circuit 33, and the output of the FM demodulator 6 and the output of the high frequency conversion circuit 9 are supplied to this output processing circuit 33. The output processing circuit 33 is provided with a decoder 34, and the high frequency conversion circuit 9 outputs the original frequency of 3.58M.
The carrier color signal C converted to Hz is decoded to obtain color difference signals RY, B to Y. That is, as shown in FIG. 2, the decoder 34 includes an R-Y demodulator 35 and a B-Y
A demodulator 36 is provided and the carrier color signal C is fed to these demodulators 35,36. The R-Y demodulator 35 has 3
．． The oscillation output of a 58MHz oscillator 38 is added,
A RY color difference signal is derived from the output side. Above 3
．． The phase comparator 37 compares the phase of the oscillation output of the 58 MHz oscillator 38 with the phase of the color burst signal 39, and when an error occurs, the phase of the oscillation output from the 58 MHz oscillator 38 is compared with the phase of the color burst signal 39.
A phase correction signal is derived to correct the error. The oscillation output of the oscillator 38 is also applied to the BY demodulator 36 through a 90'' phase delay circuit 41, and the output from the BY demodulator 36 is delayed in phase by 90' from the color difference signal RY. A color difference signal B-Y is derived.Since it is configured in this way, the component signal output terminals 31a, 31b, 31c provided in the reproduction system 2
A luminance signal Y and color difference signals R-Y and B-Y are respectively derived from these signals.

On the other hand, the component signal input terminal 3 provided in the recording system 1
The luminance signal Y and color difference signals R-Y and B-Y inputted from 2a, 32b, and 32c are introduced into the input processing circuit 42.

This input processing circuit 42 includes a low pass filter (LPF).
43, 44, 45 and an encoder 46, and the luminance signal Y is passed through a low-pass filter 43 to cant high frequencies so as not to generate unnecessary spurious signals in FM, and then sent to the contact 16a of the changeover switch 16 and the changeover switch notch 17. The signal is supplied to the FM modulator 18 via the contact 17b.

Color difference signal R input from the input terminals 32b and 32c
-Y and B-Y are also introduced into the encoder 46 after passing through low-pass filters 44 and 45 to prevent spurious from occurring during low-frequency conversion.

The encoder 46 is provided with an RY modulator 47 and a BY modulator 47, as shown in FIG.

The color difference signal R-Y is introduced into the R-Y modulator 47, and the color difference signal B-Y is introduced into the B-Y modulator 48.

3 and 5 output from the oscillator 49 to the R-Y modulator 47.
The 8MHz oscillation output is added as is, and B-Y
The oscillation output of the oscillator 49 is applied to the modulator 48 through a 90'' phase delay circuit 50.As a result, the color difference signals R-Y and B-Y are each encoded at a frequency of 3.58 MHz, and their synthesis The output is the same as the carrier color signal C of the color video signal NTSC input from the composite input terminal 12.The carrier color signal C output from the encoder 46 is supplied to the low frequency conversion circuit 23 via the changeover switch 22. It is recorded on the magnetic tape 3 in the same manner as described above.

As described above, since the recording system 1 and the playback system 2 are provided with the component signal input terminals 32a to 32c and the output terminals 31a to 31c, respectively, when dubbing is performed using the playback device and the recorder, the playback component signal can be directly input. can be recorded on the magnetic tape 3. For that reason y /
Since it is not necessary to perform c-separation, good dubbing can be performed without inconveniences such as deterioration of the phase and frequency characteristics of the luminance signal or phase distortion of the carrier color signal.

In addition, since component signals can be input directly, peripheral devices that output component signals, such as special effects devices or personal computers that insert dates and titles on the recording screen, can be directly connected.
Expands the uses of input/output terminals. It is also easy to create a unified standard for connection specifications between devices.

Furthermore, if the camera is integrated, the camera output can be recorded as is without Y/C separation, so it is more expensive.
can be recorded.

Furthermore, since the reproduction system 2 is designed to be able to output component signals, the component signals can be directly input to a color receiver having a component input terminal. In this case, since there is no need to perform Y/C separation within the receiver, a high-quality monitor can be provided even with a general home receiver.

In the above embodiment, Y is used as a component signal.
/RY/B-Y is shown, but the component signals may be Y, I, Q or R, G, B. In either case, recording/reproduction or monitoring can be performed simply by processing with a matrix circuit. Since this can be done, image quality deterioration does not occur.

〔Effect of the invention〕

As described above, the present invention provides a component signal input terminal in the recording system and a component signal output terminal in the playback system so that component signals can be directly input and output, so it is suitable for dubbing and camera shooting. It is possible to record without performing Y/C separation. Therefore, it is possible to prevent phase distortion of the carrier color signal and deterioration of the phase and frequency characteristics of the luminance signal, and to perform good recording.

You can also input component signals, so
Peripheral devices such as special effects devices that output component signals can now be directly connected, and the configuration of the recording/playback system can be simplified.

Furthermore, since component signals can be output from the reproduction system, a high-quality monitor without Y/C separation within a color receiver becomes possible.

[Brief explanation of the drawing]

FIG. 1 is an overall block diagram of the recording/playback device of the present invention, and FIG.
The figure is a block diagram of a decoder, and FIG. 3 is a block diagram of an encoder. In addition, in the symbols used in the drawings, 1.
−−−−−−−1・−・−・−Reproduction system 3・・−・−・−
・・−・−・−・・Magnetic tape 11～・−・−・−・−
Composite output terminal 12・----11------
−−Composite input terminal 16.22・・−・・−・−
・Selector switch 31a, 31b, 31c m--1---------Component signal output terminal 32a, 32b, 32c ・-------1...Component Signal input terminal 33 - - - - - - - Manual processing circuit.

Claims (1)

[Claims] In the recording system, the luminance signal and the carrier color signal of the input composite color video signal are separated, the luminance signal is subjected to FM modulation, the carrier color signal is converted to a low frequency, and both are separated. Combine and record, and in the reproduction system, FM demodulate the luminance component of the reproduced signal, convert the carrier color component to a high frequency, synthesize the reproduced luminance signal and reproduced carrier color signal, and derive a composite color video signal. A color video signal recording and reproducing device includes an input terminal for a color video signal consisting of component signals, an input processing circuit for obtaining a luminance signal and a carrier color signal from the input component signals, and a composite system for transmitting the luminance signal and carrier color signal. The recording system includes a changeover switch that switches between the component systems and supplies the FM modulation and low frequency conversion circuits, and an output processing circuit that converts the reproduced luminance signal and the reproduced carrier color signal into component signals, and the component system. A recording and reproducing apparatus for color video signals, characterized in that the reproducing system is provided with a signal output terminal.