JPH01146474A - Video signal processor - Google Patents

Abstract

PURPOSE:To make the picture of a Braun tube into an abstract picture by controlling a video sampling means according to the level of an input sound signal. CONSTITUTION:An abstracting part 14 consists of a sawtooth wave signal generating means 15 to generate a first sawtooth wave signal S1 in synchronization with a horizontal synchronizing signal Hs and a second sawtooth wave signal S2 in synchronization with a vertical synchronizing signal Vs, a control voltage generating circuit 16 to generate a control voltage which changes according to the level of a sound signal (a),plural comparators 171, 172, 173 and 174 to compare the first and second sawtooth wave signals S1 and S2 with the above-mentioned control voltage, and a synthesizing means 18 to synthesize the output signal of the above respective comparators 171-174 and to obtain a horizontal vertical blanking pulse. Thus, by receiving a general television broadcasting radio wave, the abstract picture can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to an apparatus 1 for processing video 1M such as television broadcast signals.

BACKGROUND OF THE INVENTION Recently, attempts have been made to project abstract images on television receivers and cathode ray tubes in color monitor devices, and to utilize the images as part of the living environment. Since the processing device is configured to faithfully reproduce the input video signal, in order to obtain an abstract video (this is done by playing back a videotape on which an abstract video has been recorded using a video tape recorder, An abstract image is reproduced by reproducing a video signal using a video signal processing device.

Problems to be Solved by the Invention With such a conventional configuration, in order to obtain abstract new images, it is required to purchase new video software one after another, which is an economic burden.

An object of the present invention is to provide a video signal processing device that can display an abstract video on a cathode ray tube by using a non-abstract general video signal.

Means for Solving the Problems The video signal processing device of the present invention generates a first sawtooth wave signal synchronized with a horizontal synchronization signal of an input video signal and a second sawtooth wave signal synchronized with a vertical synchronization signal. a sawtooth wave signal generating means for generating a signal; a control voltage generating circuit generating a control voltage that changes depending on the level of an input audio signal; a plurality of comparators for comparing the second sawtooth wave signal and the control voltage; a synthesizing means for synthesizing the output signals of the respective comparators to obtain a horizontal and vertical blanking pulse; and video processing of the input video signal. The present invention is characterized by further comprising an image extracting means for blanking the output using the horizontal and vertical blanking pulses and supplying it to the cathode ray tube.

According to this configuration, the video extraction means is controlled by the output of each comparator according to the level of the input audio signal, so the image displayed on the cathode ray tube is not a faithful reproduction screen of the input video signal, but a faithful reproduction screen. An image that looks like a partial cutout is obtained, and the size of the cutout changes depending on the level of the input audio signal, so even if the content of the input video signal is not an abstract image, the CRT screen is abstract. The result is a beautiful image.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

FIG. 1 shows a configuration diagram when the present invention is applied to a television receiver. A general television broadcast wave coming in from an antenna 1 is tuned by a tuner 2, and a video signal V, which is demodulated via a video intermediate frequency amplification/detection unit (hereinafter referred to as VIF) 3, is subjected to video signal processing. R via circuit 4
, C, , B, and output to the output amplifier circuit 5.
It has a basic configuration for faithfully reproducing the video signal Vl on the cathode ray tube 6 via the video signal Vl. Reference numeral 7 denotes an audio detection section that detects and demodulates the audio of the channel selected by the tuner 2, and the demodulated audio signal a drives the speaker 9 via the low frequency amplification circuit 8. 8. The above television receiver 10
In addition to a connector 11 for signal input/output, a switch circuit 12 as a video extraction means is provided between the video signal processing circuit 4 and the output amplification circuit 5. The abstraction unit 14 connected to the connector 11 via the connector 13 has the following circuit configured, and inputs the video signal V and the audio signal a from the television receiver 10 to the switch. A signal for switching control of section 12 is output.

The abstraction unit 14 generates a sawtooth wave signal that generates a first sawtooth wave signal Si synchronized with the horizontal synchronization signal H5E of the video signal V, and a second sawtooth wave signal S synchronized with the vertical synchronization signal v5. a generating means 15; a control voltage generating circuit 16 that generates a control voltage that changes depending on the level of the audio signal a;
．． A plurality of comparators 17, 172, 173, 1 for comparing the second sawtooth signal S, IS and the control voltage.
74 and each of the comparators 17. .about.174 output signals to obtain horizontal and vertical blanking pulses. The sawtooth wave signal generating means 15 includes a synchronization separation circuit 19 and a first signal generation circuit 2 that generates a first sawtooth wave signal S synchronized with a horizontal synchronization signal.
0. and a second signal generating circuit 20□ which generates a second sawtooth wave (M number S) synchronized with the vertical synchronizing signal V5.

FIG. 2 shows the specific configuration of the main parts of the abstraction section 14.

A first signal generating circuit 20 consisting of a transistor 21, a capacitor 22, etc. When the horizontal synchronizing signal H5 is applied to the horizontal synchronizing signal H5, the charging and discharging of the capacitor 22 causes the first voltage between the terminals E to be synchronized with the horizontal synchronizing signal H8, as shown in FIG.
A sawtooth wave signal S1 is generated.

A second signal generation circuit 20 consisting of a transistor 23, a capacitor 24, etc. When the vertical synchronizing signal V is applied to the capacitor 24, a second sawtooth wave signal S synchronized with the vertical synchronizing signal V5 is generated between its terminals as shown in FIG. do.

The control voltage generation circuit 16 consists of transistors 25, 26, etc., and when an audio signal a is applied to the transistor 25 through a resistor 27 and a coupling capacitor 28, a voltage is generated between the emitter and ground of the transistor 26 and between the collector and ground. A signal uE with the opposite direction of change.

uo occurs. Specifically, as the level of the audio signal a increases, the signal υ8 becomes higher and υ. becomes lower. Na8
Here, the resistors 29 and 30 are set so that a potential of 1/2 of the voltage 1B is applied to the base of the transistor 26, and the resistors 31 and 32 are also set to the same resistance value. has been done.

The non-inverting input (+) of the first comparator 171 and the inverting input (-) of the second comparator 17□ are the first sawtooth wave signal S,
by applying the signal υ. , υ. Compare the level with.

Figure 3 shows the level of the signal u E, C0 during a certain period υ
68. υ0. Then, the first comparator 17. The output A of is I when the level of the first sawtooth signal S, exceeds υ.
This is inverted to H level, and the output B of the second comparator 17□
The level of the first sawtooth signal S, is υ. , the L" level is inverted. When outputs A and B are wired-OR connected, a horizontal blanking pulse C shown in FIG. 3 is obtained.

Third comparator 17. The non-inverting input (+) of the fourth comparator 174 and the inverting input (-) 1 of the fourth comparator 174 are the second sawtooth wave signal S2.
is applied to C1 signal υ. , υ. The level at that time is υ67
．． Compare with υo1. Third comparator 17. and the output of the fourth
The same thing happens when the output of the comparator 174 is wired or connected! As a result, a vertical blanking pulse D shown in FIG. 3 is obtained. Here, the first to fourth comparators 17. ~1
Since the output of 74 is wired-OR connected, the output I of the combining means 18 is the horizontal and vertical blanking pulse Y.
5 is good.

This horizontal and vertical blanking pulse Y5 is applied to the connector 13.
, 11 to the switch unit 12 as a switching control signal. Here, each one input of the switch section 12 is connected to the RlG and B outputs of the video signal processing circuit 4, and the other input of the switch section 12 is connected to the abstraction section 14 through the connectors 11 and 13. Therefore, when the switch unit 12 is switched by the horizontal/vertical blanking pulse Y5, the output of the switch unit 12 is at the ground level while the horizontal/vertical blanking pulse Y is at the “H” level. The cathode ray tube 6 is in a blanking state as indicated by a hatched area 33 on the screen shown in FIG. During the period when the horizontal/vertical blanking pulse Y5 is at the °L'' level, the R, G, and B signal components of the output of the video signal processing circuit 4 are applied to the output amplifier circuit 5. An image 34 of the content of the original television video signal is obtained at the center of the screen of the cathode ray tube 6. As the level of the audio signal a increases, the area of the shaded portion 33 in FIG. 3 decreases.

Reverse 1, when the level of audio signal a becomes smaller, the shaded area 3
As a result, the area of 3 becomes larger, and an even more abstract image can be obtained than in the reception of general television broadcast waves.

In the above embodiment, the case where one television receiver is applied has been described as an example, but even if it is applied to a simple color monitor device that reproduces video and audio signals from a reproduction device such as a video tape recorder, it is not an abstract concept. Abstract images can be obtained using non-standard software.

Effects of the Invention As described above, according to the present invention, a first sawtooth wave signal synchronized with one horizontal synchronization signal of an input video signal and a second sawtooth wave signal synchronized with one vertical synchronization signal are generated. a sawtooth wave signal generating means; a control voltage generating circuit that generates a control voltage that changes depending on the level of the input audio signal; a plurality of comparators for comparing the second sawtooth wave signal and the control voltage; a synthesizing means for synthesizing the output signals of the respective comparators to obtain a horizontal and vertical blanking pulse; In order to control the image sampling means with the output of each comparator according to the level of the input audio signal, the cathode ray tube The displayed image is not a faithful reproduction screen of the input video signal,
An image that looks like a cropped portion of the faithful playback screen is obtained, and the size of the crop changes depending on the level of the input audio signal, so the content of the input video signal on the CRT screen is an abstract image. At the very least, it becomes an abstract image.

Therefore, since abstract images can be obtained using general broadcast radio waves and video software, there is no need to prepare special video software as in the past, and television receivers and color monitor devices can be used as part of the living environment. Use it as E
This is useful.

[Brief explanation of the drawing]

FIG. 1 is an overall block diagram of an embodiment of a video signal processing device of the present invention, and FIG. 2 is a circuit diagram of a main part of the device. FIG. 3 is an explanatory diagram of the main waveforms and display screen of the device. 4... Video signal processing circuit, 5... Output amplification circuit, 6
. . . Braun tube, 7 . . . Audio detection section, 12 .
...Comparator, 18...Synthesizing means, ■,...Video signal [input video signal], a...Audio signal [input audio signal], HS...Horizontal synchronization signal, ■,... - Vertical synchronization signal, St - St... 1st. a second sawtooth signal,
Y,...Horizontal/vertical blanking pulse.

Claims (1)

[Claims] 1. sawtooth wave signal generation means for generating a first sawtooth wave signal synchronized with the horizontal synchronization signal of the input video signal and a second sawtooth wave signal synchronized with the vertical synchronization signal; a control voltage generation circuit that generates a control voltage that changes accordingly; a plurality of comparators that compare the first and second sawtooth wave signals with the control voltage; and a signal that synthesizes the output signals of each of the comparators. 1. A video signal processing device comprising: a combining means for obtaining horizontal and vertical blanking pulses using the horizontal and vertical blanking pulses; and a video extracting means for blanking the video processing output of an input video signal using the horizontal and vertical blanking pulses and supplying the blanked image to a cathode ray tube.