JPS63193795A - Color video signal recording and reproducing device and color video signal transmission method - Google Patents

Abstract

PURPOSE:To attain the transmission of luminance signals and chrominance signals which have wider band and high definition than the luminance signals and chrominance signals of a NTSC specification through the use of the VTR and the CTV of the NTSC specification by providing an aperture compensating circuit and a circuit for converting the luminance signal output and the chrominance signals of the aperture compensating circuit into three primary color signals on a VTR. CONSTITUTION:A carrier chrominance signal C inputted from an input terminal 2 arrives at a color demodulation circuit 5, where it is demodulated into an I signal and a Q signal being two chrominance signals, and they reaches an YIQ/RGB conversion circuit 6, together with a Y signal outputted from the aperture compensating circuit 31. Consequently, they are converted into RGB three primary color signals, and an R signal, a G signal and a B signal are outputted to VTR output terminals 9, 10 and 11. Thus, a signal processing in the transmission of color video signals between the VTR and the CTV, namely, a series of the signal processing such as the mix of the luminance signals and the chrominance signals, frequency-separation and furthermore, RF conversion demodulation can be abbreviated, whereby the color video signals of high definition can be transmission from the VTR to the CTV without the deterioration of information on the amplitude and the phase of the transmission signal which occur due to the incompleteness of a filter and an amplifier, and addition of circuit noise.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a color video signal recording and reproducing device such as a video tape recorder that is capable of transmitting high quality color video signals to a color video signal display device such as a color television or a color printer. and a video signal transmission method.

2. Prior Art In the field of conventional consumer video tape recorders (abbreviated as VTR), VTR and color television (CT)
A composite video signal obtained by frequency-multiplexing a luminance signal and a carrier chrominance signal is used to transmit a color video signal between the baseband and the broadcast wave band (RF band).

For example, as described in Broadcasting Technology Magazine, August 1983 issue, pages 59-71, in order to transmit color video signals between a VTR and a so-called AV system TV, NTSC1J1 is used from the video output terminal of the VTR. A baseband transmission is used in which a composite image signal of composite video signals is transmitted and received by the video input terminal of the AV system TV. This baseband transmission of composite video signals between a VTR and CTV can be said to be an excellent transmission method that causes less deterioration of the composite video signal than transmission in the broadcast wave band because it does not pass through an RF converter or filter. .

However, for example, in the VH3 standard, β standard, or 8-Ryu VTR standard of a consumer VTR using the NTSC system, although the brightness signal and the color signal are recorded separately, the brightness signal is used as the carrier color signal as the output signal from the VTR. outputs a composite video signal frequency-multiplexed with CTV
Extra operations of frequency multiplexing and frequency separation are performed, in which the signal is transmitted to the CTV and frequency-separated into a luminance signal and a carrier chrominance signal using a comb filter or the like within the CTV. In other words, imperfections in filters and amplifiers during frequency multiplexing and frequency separation of luminance signals and carrier chrominance signals cause the amplitude and phase information of the transmitted signal to be lost, and circuit noise is added, degrading the quality of the transmitted signal. I have a problem.

The conventional VTR and CTV described above with reference to the drawings below.
An example of a method for transmitting a color video signal as a composite video signal between the two will be described. FIG. 2 is a block diagram of essential parts of an example of a conventional color video signal transmission system between a VTR and a CTV. In FIG. 2, it is assumed that a luminance signal and a color signal to be recorded or reproduced in a VTR are input to terminals 1 and 2, respectively. However, here, the color signal is a carrier color signal subjected to quadrature two-phase modulation using a subcarrier, and the case of the NTSC system in which the frequency of the subcarrier is 3.579545 MHz will be described hereinafter. Now, the luminance signal input from terminal 1 and the carrier color signal input from terminal 2 reach the Y/C mixing circuit 3, where they are frequency multiplexed to become an NTSC composite video signal, which is output from the Y/C mixing circuit, and the baseband signal is output from terminal 8. The signal is output as an NTSC signal and reaches the input terminal 13 of the CTV via a transmission line. In addition, the baseband NTSC composite video signal output from the Y/C mixing circuit reaches the RF modulator 4, is modulated into a broadcast wave band signal, is output from the output terminal 7 of the VTR, and is sent to the CT via a transmission line.
V input terminal 12.

NT of the broadcast wave band input from the input terminal 12 of the CTV
Is the SC composite video signal RF return tA11? It is demodulated into a baseband NTSC composite video signal at the Y/C separation circuit 18.
leading to. Further, the baseband NTSC composite video signal inputted from the input terminal 13 of the CTV also reaches the Y/C separation circuit 18. Although omitted in FIG. 2, the Y/C separation circuit 18
The input signal to the RF demodulator 17 is selected by a switcher as either the signal from the terminal 13 or the signal from the RF demodulator 17. In the Y/C separation circuit 18 , the baseband NTSC composite video signal is frequency-separated into a luminance signal (Y signal) and a carrier color signal (C signal) and outputted, respectively, but the carrier color signal is sent to the color demodulation circuit 19 . At this point, the color signal is further demodulated into two color signals, a (2) signal and a C signal. Then, the Y signal output of the Y/C separation circuit 18 and the
The C signal output is input to the YIQ/RGB conversion circuit 20 and converted into ROB three primary color signals, and the R signal, C signal and B signal are output from terminals 32, 33 and 34, respectively, and reach the cathode ray tube drive circuit of the CTV.

Problems to be Solved by the Invention As mentioned above, in the conventional transmission of color video signals between a VTR and a CTV, the luminance signal and the carrier color signal are transmitted in the form of a composite video signal that is frequency-multiplexed. During frequency multiplexing of luminance signals and carrier chrominance signals on the TV side and frequency separation on the TV side, imperfections in filters and amplifiers can damage the amplitude and phase information of the transmitted signal, causing waveform distortion and adding circuit noise. Therefore, there is a major problem in that the quality of the transmitted signal deteriorates.

In addition, for example, in the NTSC system, the luminance signal and the carrier chrominance signal are frequency multiplexed in a frequency interleaved relationship, and cross interference due to mutual interference between the luminance signal and the chrominance signal occurs.
There is a problem in that color and cross luminance become noise and have a large negative impact on image quality.

Furthermore, in the NTSC system, the luminance signal band is 4.2
Since the band of the MIIz color signal is determined to be 1.5MHz and 0.5Ml1z for the I signal and C signal, respectively, it is natural that the luminance signal with a wider band than that determined by the NTSC standard is used as the color signal. Unable to transmit.

In view of the above problems, the present invention provides a VTR that handles NTSC signals.
CT converts the color video signal output into RGB three primary color signals.
The purpose of the present invention is to provide a recording/reproducing device that enables transmission of a color video signal of higher quality than when transmitting in the form of an NTSC standard signal by transmitting it in the form of an NTSC standard signal.

Furthermore, the present invention performs horizontal contour compensation and vertical contour compensation on the luminance signal when converting a color video signal into three primary color signals, so that it can be used from a color video signal output device such as a VTR to a color video signal display device such as a CTV or a color printer. The present invention provides a color video signal transmission method that enables the transmission of high-power color video signals that have been subjected to aperture compensation.

Means for Solving the Problems In order to solve the above problems, the present invention provides a seven-batch compensation circuit for luminance signals and a matrix for converting the luminance signal outputs of the aperture compensation circuit and color signals into three primary color signals. A new circuit is added to the VTR, allowing RGB to be output directly from the VTR.
Three primary color signals are output and transmitted to a CTV having input terminals for RGB three primary color signals.

Operation In the present invention, the method described above enables VTRs and CTVs that handle conventional NTSC composite video signals to
It is possible to produce high-impact, high-quality color video signals that are wider than those specified by the SC format standard, have no mutual interference such as cross color or cross luminance, and are contour-compensated with less additional noise in the circuit system. Transmission becomes possible.

EXAMPLE An example of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of main parts in one embodiment of the present invention. In FIG. 1, it is assumed that a luminance signal (Y signal) and a carrier color signal (C signal) to be recorded or reproduced in the VTR are input to terminals 1 and 2 in the VTR, respectively. The luminance signal input from terminal 1 and the carrier color signal input from terminal 2 reach Y/C mixing circuit 3, where they are frequency multiplexed to become an NTSC composite video signal, which is output from the Y/C mixing circuit and sent to CTV via a transmission line. to the input terminal 13 of. Further, the output of the Y/C mixing circuit reaches the RF modulator 4, is modulated into a broadcast wave band signal, is outputted from the output terminal 7 of the VTR, and reaches the input terminal 12 of the CTV via a transmission line. CT
NTSC of the broadcast wave band input from input terminal 12 of V
The composite video signal is converted to baseband NT in the RF demodulator 17.
It is demodulated into an SC composite video signal and reaches the Y/C separation circuit 18. Further, the baseband NTSC composite video signal inputted from the input terminal 13 of the CTV also reaches the Y/C separation circuit 18. Although omitted in FIG. 1 as it is not essential for explaining the present invention, the input signal to the Y/C separation circuit 18 is transferred from the terminal 13 to the RF converter 1 by the switcher.
Either one of the signals from 7 and 7 is selected.

In the Y/C separation circuit 18, the baseband NTSC composite video signal is frequency-separated into a luminance signal and a carrier color signal and outputted, respectively.The carrier color signal reaches the color demodulation circuit 19, where it is further divided into two color signals. The color is demodulated into a (2) signal and a Q signal. The Y signal output of the Y/C separation circuit 18 and the I and Q signal outputs of the color demodulation circuit 19 are YIQ/RGB.
It is manually converted into an RG133 primary color signal by the converter 20,
The R signal, G signal and B signal are each sent to switcher 2.
1 input terminals 22, 23 and 24.

The above operation is the same as the conventional example, but in the present invention, the Y signal input from the input terminal 1 is sent to the aperture compensation circuit 3.
1 and horizontal contour compensation and vertical contour compensation are performed. The aperture compensation circuit is shown in Figure 3. Horizontal contour compensation is performed using gain in the high frequency range while keeping phase distortion small. Vertical contour compensation is performed by the vertical contour compensation circuit shown in Figure 4, which is used to compensate for the edges of the signal. Add a border to emphasize it.

FIG. 5 shows an example of waveforms of each part in the circuit of FIG. 3,
By passing the Y signal through the aperture compensation circuit as described above, the apparent resolution is increased, so a more impressive image can be obtained. The carrier color signal C input manually from the input terminal 2 in FIG. 1 reaches the color demodulation circuit 5, where two color signals are generated! The signal and the Q signal are demodulated and sent to the YIQ/RGB conversion circuit 6 together with the Y signal outputted from the aperture compensation circuit 31, where they are converted into RGB three primary color signals and an R signal.

G signal and B signal are respectively connected to VTR output terminal 9°10
and output to 11. The R, G and B signals output to VTR output terminals 9, 10 and 11 reach CTV input terminals 14, 15 and 16 via transmission lines.

Recently, consumer CTVs and peripheral equipment have been receiving R signals.

Standards for connections using G and B signals were established by the Electronics Industries Association of Japan (EIAJ) and defined in the EIAJ technical file TTC-008, "Interconnection of Television Receivers and Peripheral Devices." In accordance with this standard, general connection connectors (so-called analog RGB multi-connectors) are also installed on consumer CTVs, and analog RGB signal output from personal computers, etc. is directly displayed on consumer CTVs via this analog RGB multi-connector. It became possible. However, in the field of VTR, ErAJ general connection connector is used for consumer CTV and ROB.
There is nothing to transmit signals. As an embodiment of the present invention, this E
It is also possible to use an IAJ analog RGB multi-connector.

By the way, the RGB three primary color signals inputted from terminals 14, 15 and 16 in FIG. 1 reach input terminals 25, 26 and 27 of switcher 21.

In the switcher 21, one of the two sets of ROB3 primary color signals is selected manually and the terminals 28, 29 and 3
Output to 0. That is, the RGB three primary color signals output from the terminals 28, 29 and 30 are the RGB three primary color signals input from the input terminals 22, 23 and 24 of the switcher 21, and the RGB three primary color signals input from the input terminals 25, 26 and 27.
It can be switched to either OB3 primary color signal. The output of the switcher 21 then reaches the cathode ray tube. That is, although aperture compensation in a normal CTV is not shown in FIG.
This is performed between the B conversion circuit 20, but if the signal input to the CTV does not take the form of a Y signal, for example, the RG
B (If it is No. 8, aperture correction may be applied to the Y signal before converting to RG B (No. 8).

As described in detail above, by newly installing an aperture compensation circuit in the VTR and a circuit that converts the Y signal and C signal output from the aperture compensation circuit into RGB three primary color signals, the color video signal between the VTR and CTV is Because it is possible to omit a series of signal processing such as mixing of luminance signal and carrier color signal, frequency separation, and furthermore, RF conversion and demodulation in the transmission of A high-quality color video signal can be transmitted from a VTR to a CTV without deterioration of the amplitude and phase information of the transmitted signal or addition of new circuit noise.

In the embodiment, V is used as an example of a color video signal reproducing device.
Although the case of TR has been described, the present invention can be applied to all pan-package color video signal reproducing devices such as video discs and laser discs. Furthermore, in the examples, the case where Y, I and Q (No. 8) were handled was described, but Y, R-
Even when handling Y and B-Y signals, there is a one-to-one correspondence relationship between these color video signals, so the present invention is applicable to handling all color video signals.

Furthermore, although the embodiments have been described using the NTSC system, the present invention can be applied to color video signal reproducing devices that handle all composite video signals, including internationally standardized systems such as the PAL system and the SECAM system. It is.

Furthermore, in the embodiment, CT is used as the receiving side of the three primary color signals.
I explained using V as an example, but it is a liquid crystal display.

The present invention is applied to a color video signal display device configured with all three primary colors, such as a color printer.

Effects of the Invention Conventionally, color video signals are transmitted between a consumer VTR and a CTV in the form of a composite video signal of the NTSC system, for example, as described above, and the bands of luminance signals and color signals are limited by the NTSC standard. Moreover, the quality of the transmitted color video signal deteriorates due to disturbances due to mutual interference, waveform distortion due to VC separation filters, and additional noise from the circuit system.

According to the present invention, by newly providing a 7-batch compensation circuit and a circuit for converting the luminance signal output and color signals of the aperture compensation circuit into three primary color signals in a VTR, it is possible to use an NTSC standard VTR or CTV. It has the great effect of being able to transmit higher quality luminance signals and chrominance signals over a wider band than the NTSC standard luminance signals and chrominance signals. In particular, the present invention is applicable when the color video signal output such as V or rR is not a recording and reproduction of an NTSC color video signal such as a broadcast wave, but is a luminance signal or color signal that does not pass through the NTSC system in a video camera or the like. The effect of improving image quality is very large.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of main parts of an embodiment of the present invention, Fig. 2 is a block diagram of main parts of a conventional example, Fig. 3 is an aperture compensation circuit diagram, Fig. 4 is a vertical contour compensation circuit diagram, and Fig. 5 is the third
3 is a waveform diagram in the circuit shown in the figure. FIG. 3...Y/C mixing circuit, 4...RF modulator, 5...color demodulation circuit, 6...Y[
Q/RGB conversion circuit, 17...RFfi adjuster,
18... Y/C separation circuit, 19... Color demodulation circuit, 20... YIQ/RGB conversion circuit,
21-...Switcher 131...Aperture compensation circuit, 35...Horizontal contour compensation circuit,
36... Vertical contour compensation circuit, 37...
Input terminal, 38°39... IH delay circuit, 40
... Addition circuit, 41 ... (-%) double circuit, 42 ... Addition circuit, 43 ... LP
F, 44...Addition circuit, 45...Output terminal. Name of agent: Patent attorney Toshio Nakao (1 person) Figure 3 Figure 4 Figure 5

Claims (12)

[Claims] (1) A color video signal recording and reproducing device that is equipped with an aperture compensation circuit and records and reproduces a color video signal record composed of a luminance signal and a color signal, the luminance signal being a signal that has passed through the aperture compensation circuit. A color video signal recording and reproducing device comprising a matrix circuit that converts the color signal into three primary color signals of red, green, and blue. (2) The color video signal recording and reproducing apparatus according to claim (1), wherein the aperture compensation circuit is comprised of a horizontal edge enhancement circuit and a vertical edge enhancement circuit. (3) The color video signal recording and reproducing device records and reproduces the color video signal after mixing a luminance signal and a color signal having different frequencies to form a single channel signal. Signal recording and reproducing device. (4) Color video signal recording and playback consists of two signals: luminance signal and color signal.
A color video signal recording and reproducing apparatus according to claim 1, wherein the color video signal recording and reproducing apparatus records and reproduces channel component signals. (5) The color signal is a color signal obtained by quadrature two-phase modulation of two color difference signals using a subcarrier, and the color signal input to the matrix circuit is the two color difference signals. A color video signal recording and reproducing device according to scope (1). (6) The matrix circuit converts the coordinate axes into three primary color signals with desired brightness, hue, and color saturation by adding and subtracting the brightness signal and two color difference signals that make up the color video signal at a desired ratio. A color video signal recording and reproducing apparatus according to claim (1). (7) The luminance signal and color signal passed through the aperture compensation circuit are input to a matrix circuit that converts them into three types of primary color signals, and the three types of primary color signal outputs of the matrix circuit are transmitted. Color video signal transmission method. (8) The color video signal transmission method according to claim (7), wherein the aperture compensation circuit is comprised of a horizontal edge enhancement circuit and a vertical edge enhancement circuit. (9) The color video signal transmission method according to claim (7), wherein the transmission of the three types of primary color signal outputs is performed by a color video signal output device and a color television receiving facility. (10) The color video signal transmission method according to claim (7), wherein the transmission of three types of primary color signal outputs is performed between a color video signal output device and a color printer. (11) The color video signal transmission method according to claim (7), wherein the three types of primary color signals are red, green, and blue primary color signals. (12) Claim (7), characterized in that the three primary color signals are yellow, cyan, and magenta.
The color video signal transmission method described in .