JPH04130873A - Television enabling slave screen display - Google Patents

Abstract

PURPOSE:To record two slave screens from the same video output terminals by making an inputted master screen signal into the slave screen, displaying it as two slave screens in almost a 1/4 screen size with other inputted slave screen signals and outputting two same slave screen signals from the video output terminal. CONSTITUTION:A switch 5 inputs an output to a video signal processing circuit 8 when a digital signal is displayed as the master screen and inputs the output to a vertical filter 6 when it is displayed as the slave screen. Then, the switch changes over an output signal and the vertical filter 6 thins a signal inputted by a control signal from a memory control circuit 10 in a vertical direction by 1/2, outputs it and inputs it to a field memory 7. Thus, picture data is reduced in a horizontal direction into almost 1/2 and slave screen picture data which is made into almost the 1/4 slave screen size is added to a switch 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television capable of displaying a small screen, and more particularly to a television capable of outputting two small screen signals to a video output terminal.

In recent years, with the development of digital technology, televisions have been provided that are capable of displaying a sub-screen on a main screen by digitizing video signals and performing signal processing, and are now being used for simultaneous viewing of programs on other TV programs.

[Conventional technology]

On TVs that enable conventional sub-screen display, the third
There is no device that allows the main screen with a sub-screen display as shown in Figure (a) to be output directly to the video output terminal of the TV, but only the one that can be output to the video output terminal is shown in Figure 3).
Therefore, the images recorded from the video output terminal were also limited to the main screen.

[Problem to be solved by the invention]

The present invention can convert an input main screen signal into a sub screen and display it together with other input sub screen signals as two sub screens of approximately 1/4 screen size. It is an object of the present invention to enable a small screen signal to be outputted also from a video output terminal so that two small screens can be recorded from the same video output terminal.

[Means to solve the problem]

As shown in FIG. 1, a first sub-screen creation circuit includes a color demodulation circuit 2 to a field memory 7, a second sub-screen creation circuit includes a color demodulation circuit 13 to a field memory 17, A blueback signal generation circuit 11, a memory control circuit 10, and a switch 9 are provided to branch a signal from the first child screen creation circuit and input it to the video signal processing circuit 8 of the main screen, and to output the same video signal. The output of the parent screen display signal processed by the processing circuit 8, the output of the first child screen creation circuit, the output of the second child screen creation circuit, and the output of the blueback signal generation circuit 11. The signal input to the switch 9 is input to the switch 9, and the signal input to the switch 9 is switched and output based on the control signal from the memory control circuit 10, and the screen is displayed based on the output, and the output is also connected to the D/A. The signal is converted into an analog signal by a converter 18 and inputted to a composite converter 19, which converts it into a composite signal and outputs it to a video terminal 22 provided in the device.

Furthermore, for audio signal processing, the video signal supply circuits input to the first child screen creation circuit and the second child screen creation circuit are branched, one of which is input to the audio signal processing circuit 20, and the same is input to the audio signal processing circuit 20. The audio signal processing circuit 20 demodulates the audio signal and converts it into an audio signal.
The signal is output to the audio output terminal of Lch24, and the other signal is input to the audio signal processing circuit 21, which demodulates the audio signal, converts it to an audio signal, and outputs it to the audio output terminal of Lch24. It is.

[Effect]

The present invention has the above-described configuration, and the switch 9 receives the output from the main screen video signal processing circuit 8, the output from the first child screen creation circuit, the output from the second child screen creation circuit, and the blueback signal. If the main screen is to be displayed on the cathode ray tube by the control signal from the memory control circuit 10, the switch 9 is switched so that the signal from the video signal processing circuit 8 is output. Therefore, the main screen signal is outputted from the video terminal 22 and the audio signal output terminal 24.

When displaying a child screen as shown in Figure 3 on the main screen, the switch 9 is switched so that the signal from the video signal processing circuit 8 and the output of the second child screen creation circuit are combined and output. When displaying two sub-screens of approximately 1/4 screen size as shown in FIG. 2(a), switch the switch 9 so that the output of the first sub-screen creation circuit The output of the creation circuit, the output of the first child screen creation circuit, and the output of the second child screen creation circuit other than those displayed on the screen are shown in Figure 2 (
a) The output of the blue back signal generating circuit 11 which is masked in blue is output as shown by the diagonal line inside, so that the video terminal 22 outputs a signal as shown in FIG. 2 (c). so that the Rch installed in the device
The audio signal for the second sub-screen can be output to the audio output terminal 23, and the audio signal for the first sub-screen can be output to the audio output terminal Lch 24.

〔Example〕

FIG. 1 is a block diagram of an electric circuit of a television capable of outputting two screens according to an embodiment of the present invention. The video signal is then applied to the input terminal 1.

The signal applied to the input terminal 1 is input to the first child screen creation circuit, and the input video signal is input to the color demodulation circuit 2, where the same color demodulation circuit 2 demodulates the color and converts it into a luminance signal. In addition to converting it into a color difference signal and outputting it and adding it to the A/D converter 4, the input video signal is passed through and output, and the video signal is added to the sync separation circuit 3. The input luminance signal and color difference signal are converted into digital signals, output, and applied to the switch 5.

The switching device 5 inputs the output to the video signal processing circuit 8 when displaying the input digital signal as the main screen according to the control signal from the memory control circuit 10, and inputs the output vertically when displaying it as the sub screen. Filter 6
The vertical filter 6 thins out the input signal by half in the vertical direction according to the control signal from the memory control circuit 10 and outputs the thinned signal to be input to the field memory 7. Then, the synchronization separation circuit 3 separates a horizontal synchronization signal and a vertical synchronization signal from the input video signal and inputs them to the field memory 7, which is synchronized with the horizontal synchronization signal and the vertical synchronization signal. The input signal is stored as image data.

By reading out the stored image data from the field memory 7 while changing the read speed according to a control signal from the memory control circuit 10, the image data is reduced to approximately 1/2 in the horizontal direction. 1/4
The image data for the child screen with the size of the child screen is added to the switch 9.

On the other hand, the input terminal 12 receives a signal from another source different from the signal applied to the input terminal 1, for example, satellite broadcasting, and amplifies and detects the signal converted to an intermediate frequency to generate a video signal. The signal applied to the input terminal 12 is input to the second child screen creation circuit, the input video signal is input to the color demodulation circuit 13, and the same color demodulation circuit 13 inputs the input video signal to the second sub-screen creation circuit. It performs color demodulation, converts it into a luminance signal and a color difference signal, outputs the signals, and adds them to the A/D converter 15, and also passes through the input video signal and outputs it to add the video signal to the synchronization separation circuit 14. The A/D converter 15 converts the input luminance signal and color difference signal into digital signals, outputs the digital signals, and inputs the digital signals to the vertical filter 16.

The vertical filter 16 is connected to the memory control circuit 10.
The input signal is vertically 1/1/2 by the control signal from
The input image signal is thinned out by approximately 1/2 in the vertical direction.
2 and input it to the field memory 17, and the synchronization separation circuit 14 separates the horizontal synchronization signal and vertical synchronization signal from the input video signal and inputs them to the field memory 17. 17 stores the input signal as image data in synchronization with the horizontal synchronization signal and the vertical synchronization signal.

By reading out the stored image data from the field memory 17 while changing the read speed according to a control signal from the memory control circuit 10, the image data is reduced to approximately 1/2 in the horizontal direction. 1/
The image data for the sub-screen with the sub-screen size of 4 is transferred to the switch 9.
I try to add it to

The output of the blue back signal generation circuit 11 is added to the switch 9, and the output of the blue back signal ordering circuit 11 is also added to the switch 9.
The horizontal synchronization signal and vertical synchronization signal generated at is counted, and the control signal for reading is added to the field memories 7 and 17 so that the sub-screen is displayed at a predetermined position.

A switch 9 switches between the output of the video signal processing circuit 8 for the main screen, the output of the first child screen creation circuit, and the output of the second child screen creation circuit according to a control signal from the memory control circuit 10. , and the output of the blueback signal generation circuit 11 are switched at high speed and output, and based on the same output, a screen is displayed on the cathode ray tube, and the same output is converted into an analog signal by the D/A converter 18 to calculate the brightness and color difference. /composite converter 19, the same brightness/color difference/composite converter 19 converts it into a composite signal, and outputs it to a video terminal 22 provided in the device.

On the other hand, the audio signal processing circuit branches the video signal supply circuits that are input to the first child screen creation circuit and the second child screen creation circuit, and connects one to the audio signal processing circuit 20.
The audio signal is input to the audio signal processing circuit 20, which demodulates the audio signal and converts it into an audio signal.
output to the audio output terminal of the audio signal processing circuit 21.
The audio signal is demodulated by the audio signal processing circuit 21, converted into an audio signal, and output to the other audio output terminal of the Lch 24.

〔Effect of the invention〕

As explained above, according to the present invention, the input main screen signal is made into a sub screen and displayed on the cathode ray tube as two sub screens of approximately 1/4 screen size together with other input sub screen signals. Also, the same two small screen signals can be output from the video output terminal.
It is possible to provide a television that can record two sub-screens and display convenient sub-screens.

[Brief explanation of drawings]

Fig. 1 is an electric circuit block diagram of a television capable of 21i screen output showing an embodiment of the present invention, Fig. 2 (6): (b) is a signal supplied to the screen display and output terminal according to the present invention. FIG. 3 is an explanatory diagram of a display screen based on a conventional screen display and a signal supplied to an output terminal. 1, 12---one input terminal, 2.13---color demodulation circuit, 3. li-synchronization separation circuit, 4. 15-A/
D converter, 5.9...--Switcher, 6, 16...--Vertical filter, 7.17...-Field memory, 8...-Video signal processing ryIfIR,,lo...-Memory control circuit, 11...-Blue back signal generation circuit,
18...=D/A converter, 19--Brightness/color difference/composite converter, 20.21--Audio signal processing circuit, 22, 23.24--Output terminal. Patent applicant: Fujitsu General Ltd.

Claims (4)

[Claims] (1) A first child screen creation circuit, a second child screen creation circuit,
A blueback signal generation circuit, a memory control circuit, and a switch are provided to branch the signal from the first child screen creation circuit and input it to the video signal processing circuit of the main screen, and process the video signal of the same parent screen. The output of the circuit, the output of the first child screen creation circuit, the output of the second child screen creation circuit, and the output of the blueback signal generation circuit are input to the switch, and the output from the memory control circuit is inputted to the switch. The control signal switches the signal input to the switching device and outputs it, displays the screen based on the output, and converts the same output to D/D.
It is possible to display a small screen by converting it into an analog signal with an A converter, inputting it to a composite converter, converting it to a composite signal with the composite converter, and outputting it to a video terminal provided on the device. TV. (2) The first sub-screen creation circuit includes a color demodulation circuit that demodulates the input video signal, converts it into a luminance signal and a chrominance signal, and outputs the same; and a color demodulation circuit that converts the luminance signal and chrominance signal into digital signals. The output A/D converter and the digital signal from the A/D converter are input to the video signal processing circuit when creating the main screen according to the control signal input from the memory control circuit, and when creating the sub screen. is a switch that inputs to the vertical filter, a vertical filter that thins out the small screen creation signal output from the switch to 1/2 in the vertical direction, and outputs the thinned out signal to 1/2 in the vertical direction. 2. The dual screen output according to claim 1, further comprising a field memory in which the stored data can be read out by changing the reading speed according to a control signal from the memory control circuit. The television that made it possible. (3) The second sub-screen creation circuit includes a color demodulation circuit that demodulates the input video signal, converts it into a luminance signal and a chrominance signal, and outputs the same, and a color demodulation circuit that converts the luminance signal and chrominance signal into digital signals. an A/D converter to output, a vertical filter to thin out the output of the A/D converter to 1/2 in the vertical direction and output it, and store the output thinned to 1/2 in the vertical direction as data; The device according to claim 1, further comprising a field memory whose reading speed is changed by a control signal from the memory control circuit so that the stored data can be read out. tv set. (4) The supply circuits for the video signals input to the first child screen creation circuit and the second child screen creation circuit are branched, and one is input to the first audio signal processing circuit, and the first audio signal processing circuit is processed. The circuit demodulates the audio signal, converts it into an audio signal, outputs it to one of the Rch and Lch audio output terminals provided in the device, and inputs the other to a second audio signal processing circuit. Claims (1) and (2) characterized in that the audio signal is demodulated and converted into an audio signal and outputted to the other of the Rch and Lch audio output terminals.
) or a television capable of displaying a sub-screen as described in (3).