JPS62110388A - Signal switching device - Google Patents

Abstract

PURPOSE:To easily execute the color adjustment of original color drive system by stopping luminance signals in a television receiver, separating horizontal and vertical synchronizing signal from luminance signal taken out to a signal switching device and applying it to the television receiver. CONSTITUTION:When a signal switching device 1 is connected to a television receiver 11 and switches 6a-6d are closed, the luminance signal 13 including horizontal and vertical synchronizing signal is no more inputted to a luminance signal input terminal 25. On the other hand, the luminance signal 13 including horizontal and vertical synchronizing signal is inputted to the luminance signal input terminal 2 of the signal switching device 1, and the horizontal and vertical signal is separated by a synchronizing separator section 7, and applied to the horizontal and vertical synchronizing signal input terminal 28 of the television receiver 11 from a horizontal and vertical synchronizing signal output terminal 5. Thereby, chrominance signal and horizontal and vertical synchronizing signal are inputted to an original color drive signal generating circuit 24, and original chrominance signal that does not include the luminance signal is obtained from original color signal output terminals 29, 30, 31.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a signal switching device that facilitates adjustment of a circuit using a primary color drive system of a television receiver.

BACKGROUND OF THE INVENTION In recent years, as the degree of integration of integrated circuits used in television receivers has increased and circuit functions have become more integrated, the luminance signal 37 and color signal 38 including horizontal and vertical synchronization signals shown in FIG. Input R-G-B primary color drive signals 39, 40,
Integrated circuits 36 that output 41 have been utilized.

In the primary color drive system of television receivers, R, G,
It outputs the three primary colors of H, and each output includes a luminance signal and a color signal. FIG. 4 shows an example of a test signal for adjusting a television receiver and part of its waveform, in which 42 shows a color par pattern, 43 a luminance signal, 44 a back component, and 46 a back color difference component. The signal obtained as a cathode ray tube input signal of the primary color drive system has a waveform 44 in FIG. 4, but the waveform 46 in FIG. 4 is required for color adjustment.

Therefore, it is necessary to use a signal that does not include a luminance component as a transmission signal.

FIG. 6 shows a conventional signal switching device. 46 is a signal switching device; 47 is a first transmission signal generator; 48 is a signal containing a luminance component sent from the first transmission signal generator 47;
9 is a second transmission signal generator, 50 is a signal sent from the second transmission signal generator 49 and does not include a luminance component, and 61 is a first transmission signal generator 4 and a second transmission signal generator. 49
52 indicates a television receiver.

The operation of the signal switching device configured as described above will be described below. A signal 48 containing a luminance component sent from the first transmission signal generator 47 is input to the television receiver 52 through the first contact 51b of the switch 51, and the luminance is adjusted.

On the other hand, color adjustment is performed by inputting the signal 6o, which does not include a luminance signal, sent from the second transmission signal generator 49 to the television receiver 52 via the second contact 51a of the switch.

Problems to be Solved by the Invention However, the above configuration has the problem of increased equipment cost due to the use of two transmitting signal devices.

In view of the above conventional problems, the present invention reduces the adjustment by stopping transmission of the luminance component during color adjustment and transmitting the luminance component during brightness adjustment in a television receiver from a transmission signal including the luminance component. It is an object of the present invention to provide a signal switching device that can be easily performed at low cost.

Means for Solving the Problems In order to achieve this object, the signal switching device of the present invention has a terminal for stopping the transmission of the luminance component and a terminal for stopping the horizontal/vertical synchronization signal generator in the television receiver. ,
For television receivers, there is a terminal for inputting a luminance signal including horizontal and vertical synchronization signals, a horizontal and vertical synchronization signal separation section that separates only the synchronization signal from that signal, and a terminal for receiving the separated horizontal and vertical synchronization signals. It consists of a terminal for connecting to a television receiver, and a switch for selecting whether to transmit or stop the luminance component depending on whether or not a television receiver is connected to each terminal.

Effect: With this configuration, when the switch of the signal switching device is selected to stop the luminance component, the signal path of the luminance signal including the horizontal and vertical synchronizing signals is cut off by the luminance signal stop terminal in the television receiver. The terminal for stopping the horizontal/vertical synchronizing signal generator stops the operation of generating horizontal/vertical synchronizing signals within the television receiver.

On the other hand, the terminal that inputs the brightness signal including the horizontal and vertical synchronization signals from the television receiver separates only the horizontal and vertical synchronization signals from the signal and applies the separated horizontal and vertical synchronization signals to the television receiver. output to the horizontal and vertical synchronization signals of the television receiver. In this way, only the luminance component is stopped in the television receiver, and a primary color signal output that does not include the luminance component necessary for color adjustment is obtained.

Next, when the switch of the signal switching device is selected to the side that transmits the luminance component, there is a terminal that stops the luminance signal including horizontal and vertical signals, a terminal that stops the horizontal and vertical synchronization signal generator, and a terminal that stops the horizontal and vertical synchronization signal generator. The terminal for inputting the luminance signal including the signal and the terminal for outputting the synchronized and separated horizontal and vertical synchronization signals to the television receiver are separated from the television receiver, and the signal processing including the luminance component is performed within the television receiver. is performed, and a primary color signal output including a luminance component is obtained.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 2 is a signal connection diagram showing an overview of this device. A signal including a luminance component is sent from the transmission signal generator 33 to the television receiver, and the luminance component is converted in the television receiver 11 by the signal switching device 1. It is configured to either transmit or stop the transmission.

In the figure, 1 is a signal switching device, 2 is a luminance signal input terminal,
3 is a brightness signal stop terminal, 4 is a horizontal ψ vertical synchronization signal stop terminal, 5 is a horizontal/vertical synchronization signal output terminal, sa, eb, 6
c and ad are brightness transmission/stop switching switches, R is a synchronization separation unit, 8 and 9 are resistors for applying positive potential, 11 is a television receiver, 12 is a composite video signal after video detection, 13 is horizontal and vertical 14 is a chrominance signal, 1 is a luminance signal including a synchronization signal;
6 is a luminance component passing filter, 16 is a color component passing filter, 17.1B, 19, 20, 21 . 22 and 23 are luminance signal input circuits, 24 are primary color drive signal generation circuits,
25 is a luminance signal input terminal, 26 is a color signal input terminal, 27
Reference numeral 28 indicates a horizontal/vertical synchronizing signal operation control terminal, 28 indicates a horizontal/vertical synchronizing signal input terminal, and 29° 30.31 indicates a primary color signal output terminal.

The operation of the signal switching device configured as described above will be explained below.0 First, inside the television digital signal receiver 11, the video-detected composite video signal 12 passes through the luminance component pass filter 15 and the color signal pass filter 16, and then is horizontally - Separated into a luminance signal 13 including a vertical synchronization signal and a color signal 14. The luminance signal 13 is sent to input circuits 17, 18, 19, 2
0°21.22, 2.3, is input to the luminance signal input terminal 26 of the primary color drive signal generation circuit 24, and the color signal 1
4 is input to the color signal input terminal 26 and subjected to signal processing,
The signals are output to primary color signal output terminals 29, 30, and 31. The primary color signal at this time includes a luminance component.

Next, the signal switching device 1 is connected to the television receiver 11, the switches f 6 a, 6 b, 6 C, and 6 d are closed, and the brightness signal 13 including the horizontal and vertical synchronizing signals is sent to the brightness signal input terminal 25. It will no longer be input. At the same time, a voltage is applied to the synchronization signal stop terminal 4 and the horizontal/vertical synchronization signal operation control terminal 27 in the primary color drive signal generation circuit 24 to stop the internal synchronization generation operation. On the other hand, the luminance signal 13 including the horizontal and vertical synchronization signals is input to the luminance signal input terminal 2 of the signal switching device 1, and the horizontal and vertical synchronization signals are separated by the synchronization separator 7. The signal is applied to the horizontal/vertical synchronizing signal input terminal 28 of the John receiver 11. As a result, the color signal and the horizontal and vertical synchronization signals are input to the primary color drive signal generation circuit 24, and a primary color signal that does not include a luminance signal is obtained from the primary color signal output terminals 29, 30, and 31.

Effects of the Invention As described above, according to the present invention, the luminance signal is stopped within the television receiver, and the horizontal and vertical synchronization signals are separated from the luminance signal taken out to the signal switching device and applied to the television receiver. As a result, a primary color signal containing no luminance component can be obtained, and color adjustment using the primary color drive method can be easily performed. Furthermore, the brightness signal transmission/stop switch of the signal switching device allows easy selection and brightness adjustment.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a signal switching device according to an embodiment of the present invention, Fig. 2 is an overall signal connection diagram thereof, Fig. 3 is a block diagram thereof, and Fig. 4 is a waveform of a test signal for a television receiver. FIG. 5 is a signal connection diagram of a conventional signal switching device. 1...Signal switching device, 2...Brightness signal input terminal, 3...Brightness signal stop terminal, 4...
...Horizontal/vertical synchronization signal stop terminal, 6...Horizontal/vertical synchronization signal output terminal, 6 (6a, 6b, ec, 6
rl)...--Brightness signal transmission/stop selection switch,
7...Horizontal/vertical synchronization separation section, 11...
・Television receiver.

Claims (1)

[Claims] A terminal for stopping the transmission of the brightness signal including the horizontal and vertical synchronization signals of the video detection output signal of the television receiver, a terminal for stopping the operation of the horizontal and vertical synchronization signal generator, and a terminal for stopping the transmission of the brightness signal including the horizontal and vertical synchronization signals of the video detection output signal of the television receiver. A terminal for inputting signals,
A synchronization separator that separates only the horizontal and vertical synchronization signals from the signal, a terminal that adds the separated synchronization signals as horizontal and vertical synchronization signals to the television receiver, and a terminal that connects each of the above terminals to the television receiver. A signal switching device comprising a switch that selects transmitting and stopping a luminance signal depending on whether the luminance signal is transmitted or not.