JPH0670244A - Video equipment - Google Patents

Abstract

PURPOSE:To facilitate the additional digital processing such as the external printer processing. CONSTITUTION:A digital video signal SVDA and a system clock CLKA are produced based on the analog composite video signal SV which is supplied from a tuner circuit 1 or an analog input terminal 16. These signal and clock are outputted to the outside through a digital output terminal 6. In such a constitution, the additional digital processing is facilitated to the signal SVDA. Then it is not required to generate the system clock in a printer for the additional digital processing such as the printer processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video equipment suitable for application to, for example, a television receiver for digitally processing most of signal processing.

[0002]

2. Description of the Related Art In recent years, various types of television receivers, so-called digital televisions, which digitally perform most of signal processing have been proposed. For example, the processes from the video detection to the acquisition of the three primary color signals are digitally processed.

In conventional digital televisions, although digital signals are handled, digital signal output terminals are not provided and only analog signal output terminals are provided. That is, the analog signal after D / A conversion is output.

[0004]

However, assuming that the signal thus output is an analog signal, when further digital processing is to be performed, the analog signal is A / D converted to obtain a digital signal. Then, digital processing will be performed. Therefore, the signal processing is troublesome. In view of such a point, the present invention is to facilitate additional digital processing and additional analog processing, for example.

[0005]

The present invention is described in, for example, FIG.
As shown in, the analog composite video signal S_VOutput
Tuner circuit 1 and analog composite video signal S_VDesi
Video signal S of Taru_VDAA / D converter 2 for converting to
Video signal S of Zital_VDAAbout luminance signal and chrominance signal
Separation, demodulation of color signals, matrix of luminance signals and color difference signals
Processing and digital primary color signal R_D, G_D, B_DOutput
Signal processing circuit 3 and a digital primary color signal R_D，
G_D, B_DTo analog primary color signals R, G, B
Based on the D / A converter 4 and the analog primary color signals R, G, B
Color picture tube that displays the following image and 5, analog composite
Video signal S_VTo horizontal and vertical sync signals P_H, P_VTo
The sync separation circuit 7 for separating the sync signal_H, P_VFrom
Stem clock CLK_AClock generator 8 for generating
And the digital video signal S_VDAAnd system clock CL
K _AA digital output terminal 6 for outputting and
An external digital video signal S is supplied to the signal processing circuit 3._VDBWhen
System clock CLK_BAnd for supplying digital
Input terminal 9 and analog composite video signal S_VOut
Analog output terminal 16 for input and analog composite
Video signal S_VAnalog input terminal for externally supplying
And a child 16.

[0006]

According to the present invention, the digital video signal S _VDA and the system clock CLK _A are formed on the basis of the analog composite video signal S _V supplied from the tuner circuit 1 or the analog input terminal 16, and the digital video signal S _VDA and the system clock CLK _A are formed. It has a digital output terminal 6 for outputting the video signal S _VDA and the system clock CLK _A to the outside. Therefore, it is possible to easily perform additional digital processing on the digital video signal S _VDA . For example, when performing additional digital processing such as printer processing, it is not necessary to generate a system clock in the printer.

Further, according to the present invention, a digital video signal S _VDB and a system clock CLK supplied from the outside are supplied.
It has a digital input terminal 9 with _B. Therefore, the digital video signal S _VDB and the system clock CLK _B supplied from the outside can be used as they are.

Further, according to the present invention, the tuner circuit 1
It has an analog output terminal 16 for the analog composite video signal S _V output from. Therefore, the additional analog processing can be easily performed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. This example is an example applied to a digital television.

In the figure, reference numeral 1 denotes a tuner to detect an image.
This tuner circuit is equipped with circuits.
The composite video signal S from the circuit 1_VIs obtained. This image
Issue S _VIs supplied to the A / D converter 2 for digital video signal
Issue S_VDAThen, the signal is supplied to the signal processing circuit 3. This
The signal processing circuit 3 of FIG.
Signal demodulation, processing of matrix of luminance signal and color difference signal, etc.
From its output, digital red, green and blue
Primary color signal R_D, G_D, B_DIs obtained. And these
Primary color signal R_D~ B_DIs an analog primary color with D / A converter 4
After being converted into signals R to B, they are supplied to the color picture tube 5.

The digital video signal S _VDA from the A / D converter 2 is supplied to a digital signal output terminal (hereinafter referred to as a digital output terminal) 6.

Further, the video signal S _V from the tuner circuit 1
Is supplied to the sync separator 7, the horizontal than the separation circuit 7, the vertical synchronizing signal P _H, is P _V obtained by separating. These synchronizing signals P _H and P _V are supplied to the clock generator 8,
_A system clock CLK _A used in each part of the circuit is generated. The system clock CLK _A is supplied to the digital output terminal 6.

Further, although not shown, horizontal and vertical deflection scanning of the picture tube 5 is performed based on the synchronizing signals P _H and P _V.

Reference numeral 9 is an input terminal for a digital signal (hereinafter referred to as a digital input terminal), and an external digital video signal S supplied to the digital input terminal 9 is supplied.
_{The VDB} and the system clock CLK _B are supplied to the signal processing circuit 3.

Reference numeral 11 denotes a printer which constitutes the printer 10.
A video signal S from the output terminal 6_VDAOver
And system clock CLK_AIs supplied, for example
Issue S _VDA1 frame is written. Also, this
From the clock generator 12 to the printer 11,
System clock CLK_CIs supplied by the frame memory
11 is the video signal S_VDAAfter this clock is written
CLK_CBased on the video signal S_VDAAre read sequentially,
It is supplied to the signal conversion circuit 13. This conversion circuit 13
For example, converting the gradation to dot density, the video signal S_VDA
Is converted into a signal for the printer.
The converted signal is printed via the interface 14.
Is supplied to the printer section 15. After all, with the printer 10,
Video signal S_VDAThe image based on is printed.

Since this example is constructed as described above and has the digital output terminal 6 for outputting the digital video signal S _VDA and the system clock CLK _A , additional digital processing for the video signal, for example, a printer. Processing and the like can be easily performed. Further, in this example, since the digital input terminal 9 for the digital signal is further provided, the digital video signal S _VDB from the outside can be used as it is, which is convenient.

In the example of FIG. 1, reference numeral 16 denotes an analog input / output terminal for the analog video signal SV (hereinafter referred to as an analog input terminal, an analog output terminal or an analog input / output terminal, if necessary). This analog input terminal 1
6, a digital video signal S _VDA and a system clock CLK _A are formed on the basis of an analog composite video signal S _V supplied from the outside, and the digital video signal S _VDA and the system clock CLK _A are output to a digital output terminal. 6 can be output to the outside. Therefore, it is possible to easily perform additional digital processing on the digital video signal S _VDA . For example, when performing additional digital processing such as printer processing, it is not necessary to generate a system clock in the printer.

Further, an analog composite video signal S _{V is} output from the tuner circuit 1 through the analog output terminal 16 to the outside.
Can be supplied. With this configuration, additional analog processing, for example, processing using an external printer (so-called analog video printer) can be performed.

Next, FIG. 2 shows another embodiment of the present invention, which is an example applied to a tuner. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 2, the video signal S _V from the tuner circuit 1 is supplied to an analog signal output terminal 17 via an amplifier 16. The digital video signal S _VDA from the A / D converter 2 is supplied to the output terminal 18 of the digital signal, and the system clock CLK _A from the clock generator 8 is supplied to the output terminal 18.

Also in this example, the digital video signal S
_{Since the} output terminal 18 for outputting _VDA and the system clock CLK _A is provided, it is possible to obtain the same effects as the example of FIG.

In the example of FIG. 2, the composite video signal S
_{Although VDA} is output as an example, it may be output as a color difference signal, a primary color signal, or the like. In the example of FIG. 3, the luminance signal and the color difference signal are output. That is, the video signal S _V from the tuner circuit 1 is supplied to the luminance / color separation circuit 19. The luminance signal Y separated by the separation circuit 19 is supplied to the A / D converter 2
0 is supplied to the output terminal 18 as a digital brightness signal Y _D. The color signal C separated by the separation circuit 19 is supplied to the color demodulator 21 to obtain the red color difference signal RY and the blue color difference signal BY. Then, these color difference signals RY and BY are supplied to A / D converters 22 and 23, and converted into digital color difference signals (RY) _D and (BY) _D, and are output to the output terminal 18. Supplied.

Further, in the example of FIG. 4, the signals are output as three primary color signals. That is, the luminance signal Y from the separation circuit 19 and the color demodulator 2
The color difference signals R-Y and B-Y from the matrix circuit 2
4, and red, green, and blue primary color signals R, G, B are obtained from the matrix circuit 24. Then, these primary color signals R, G, B are supplied to the A / D converters 25, 26, 27 and converted into digital primary color signals R _D , G _D , B _D and supplied to the output terminal 18.

Although the above embodiment is an example in which the present invention is applied to a digital television and a tuner, the present invention can also be applied to other video equipment such as a video tape recorder.

[0025]

As described above, according to the present invention,
It has a digital output terminal for forming a digital video signal and a system clock based on an analog composite video signal supplied from a tuner circuit or an analog input terminal, and outputting the digital video signal and the system clock to the outside. ing. Therefore, it is possible to easily perform the additional digital processing on the digital video signal. For example, when additional digital processing such as printer processing is performed, it is not necessary to generate a system clock in the printer, so that a derivative effect that processing and configuration of the printer are simplified can be obtained.

Further, according to the present invention, it has a digital input terminal for a digital video signal supplied from the outside and a system clock. Therefore, it is possible to use the digital video signal and the system clock supplied from the outside as they are, which is convenient.

Further, according to the present invention, it has an analog output terminal for an analog composite video signal output from the tuner circuit. Therefore, it is possible to easily perform the additional analog processing, for example, the processing using the analog video printer.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the present invention.

FIG. 3 is a configuration diagram showing still another embodiment of the present invention.

FIG. 4 is a configuration diagram showing still another embodiment of the present invention.

[Explanation of symbols]

1 tuner circuit 2 A / D converter 3 signal processing circuit 4 D / A converter 5 color picture tube 6 digital output terminal 7 sync separation circuit 8 clock generator 9 digital input terminal 16 analog input / output terminal S _V analog composite video signal S _VDA, S _VDB digital video signals R, G, primary color signals R _D and B analog, G _D, B _D digital primary color signal P _H horizontal synchronizing signal P _V vertical synchronizing signal CLK _a, CLK _B system clock

Claims (1)

[Claims] 1. A tuner circuit that outputs an analog composite video signal, an A / D converter that converts the analog composite video signal into a digital video signal, and a luminance signal and a color signal for the digital video signal. Signal separation circuit, demodulation of color signals, matrix processing of luminance signals and color difference signals to output digital primary color signals, and a D / A converter for converting the digital primary color signals into analog primary color signals. A color picture tube for displaying an image based on the analog primary color signal; a sync separation circuit for separating horizontal and vertical sync signals from the analog composite video signal; and a clock generator for generating a system clock from the sync signal. And a digital output terminal for outputting the digital video signal and the system clock to the outside, the signal processing circuit A digital input terminal for supplying a digital video signal and a system clock from the outside, an analog output terminal for outputting the analog composite video signal to the outside, and an external composite video signal for supplying the analog composite video signal And an analog input terminal of.