JPH0276389A - Active back color generator - Google Patents

Abstract

PURPOSE:To obtain a moving back color from an output back color by providing a video mixture amplifier circuit so as to synthesize two kinds of back colors and providing a position data sawtooth wave generating circuit so as to move the position of a key signal. CONSTITUTION:The position data sawtooth nave generating circuit 1 generates a sawtooth wave whose level varies with each vertical television period for horizontal and vertical components independently. Then a fundamental wave harmonic wave generating circuit 2 generates a sawtooth wave for horizontal and vertical components respectively. A waveform synthesis circuit 3 receives the outputs of the fundamental wave harmonic wave generating circuit 2 to synthesize the horizontal and vertical components to shape a stereoscopic waveform. Then a video image mixing amplifier circuit 6 based on the output of the waveform synthesis circuit 3 synthesizes the outputs of back color generating circuits 4, 5 respectively. Thus, the back color with a motion as if it were flowing is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an active back color generating device used in image devices and the like.

[Conventional technology]

An example of a conventional back color generating device is shown in FIG. 3 and will be described.

In the figure, T is a puncture color generating device.

Conventionally, in this type of back color generating device, the output of the back color generating device T itself was used as the output back color, as shown in FIG.

[Problem to be solved by the invention]

In the conventional back color generation device described above, the output of the back color generation circuit itself was used as the output back color, so it did not have a video mixing amplification circuit.
There was a problem in that it was not possible to synthesize different background colors. Another problem was that it was not possible to generate a moving back color.

[Means to solve the problem]

The active back color generation device of the present invention includes a position data sawtooth wave generation circuit that independently generates a horizontal component and a vertical component as a sawtooth wave whose value changes every vertical television cycle, and a position data sawtooth wave generation circuit that independently generates a horizontal component and a vertical component. A fundamental wave/harmonic wave generation circuit that receives the output of the sawtooth wave generation circuit and generates the fundamental wave or harmonics of horizontal and vertical television cycles, and a waveform that receives and synthesizes the outputs of the fundamental wave/harmonic wave generation circuit, respectively. a synthesis circuit; a video mixing amplifier circuit that receives the output of the waveform synthesis circuit, the output of the first pack color generation circuit, and the output of the second back color generation circuit to generate and output a moving pack color; It consists of

[For production]

In the present invention, a video mixing amplification circuit is provided to synthesize two types of back colors, and a position data sawtooth wave generation circuit is provided to synthesize two types of back colors. The position of the key signal is moved, and as a result, the output back color becomes a moving back color.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing an embodiment of an active pack color generating device according to the present invention.
1 is a position data sawtooth wave generation circuit that independently generates horizontal and vertical components of position data as a sawtooth wave whose value changes every vertical television cycle; 2 is the output of this position data sawtooth wave generation circuit 1; 3, a waveform synthesis circuit that receives and synthesizes the outputs of the fundamental wave/harmonic generation circuit 2; 4; 5 is a back color generation circuit; 6 is a video mixing amplifier circuit that receives the output of the waveform synthesis circuit 3, the output of the back color generation circuit 4, and the output of the back color generation circuit 5, respectively, and generates and outputs a moving back color; It is.

FIG. 2 is an explanatory diagram of the operation of FIG. 1, where (a) is the output of the position data sawtooth wave generation circuit 1, S□, S,...
As shown in S, the toothed wave is generated every vertical television period. (b-1), (b-2)...(b-4
) is the output fundamental wave of the fundamental wave/harmonic generation circuit 2, and 81~
S4 is the starting point given by the output of the position data sawtooth wave generation circuit 1, (c) is the waveform synthesis circuit 3
This is a case where the output waveform of the fundamental wave/harmonic generation circuit 2 has a waveform in which both the horizontal and vertical components are represented by (b-1). (d-1), (d-2)...(d-4) are the output screens of the video mixing amplification circuit 6, and the output waveforms of the fundamental wave/harmonic generation circuit 2 are both horizontal and vertical components (b -1
) to (b-4).

Next, the operation of the embodiment shown in FIG. 1 will be explained with reference to FIG. 2.

First, the position data sawtooth wave generation circuit 1 is shown in FIG.
S1→S every vertical television period as shown in a)
, and the horizontal component of the sawtooth wave whose value changes.

The vertical component occurs independently. The fundamental wave/harmonic generation circuit 2 generates a sawtooth wave as shown in FIG. 2(b-1) for each of the horizontal and vertical components. Sl
is the start point of the sawtooth wave, and the level of this start point is given to the output S1 of the position data sawtooth wave generation circuit 1, as shown in Fig. 2 (b-1) to (b-4). The starting point for each vertical television period is 81~S.
, and the position of the waveform moves.

Next, K, the waveform synthesis circuit 3 is the fundamental wave/harmonic generation circuit 2.
Taking as an example the case where the horizontal component and the vertical component are synthesized by receiving the outputs of , and both the horizontal component and the vertical component have the waveform shown in Fig. 2 (b-1), the waveform shown in Fig. 2 (e) is obtained. Shape the three-dimensional waveform as shown.

Next, the video mixing amplification circuit 6 synthesizes the respective outputs of the back color generation circuits 4 and 5 based on the output of the waveform synthesis circuit 3. Both the horizontal and vertical components are shown in Figure 2 (b
-1) to (b-4), the outputs of the back color generation circuits 4 and 5, white and blue, respectively, are synthesized by the video amplification circuit 6 based on the fundamental waves that are moving,
If you look at the output back color on the screen, it will look like Figure 2 (d-1)~
As shown in (d-4), it is possible to generate a moving back color that appears to be flowing in the direction of the arrow.

〔Effect of the invention〕

As explained above, the present invention combines two types of back colors by providing a video amplification circuit, and furthermore, by providing a position data sawtooth wave generation circuit, two types of back colors are synthesized.
This has the effect of moving the position of the key signal that is the output of the waveform synthesis circuit for synthesizing different types of back colors, and as a result, the output back color can be made into a moving back color.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an active back color generating device according to the present invention, FIG. 2 is an explanatory diagram of the operation of FIG. 1, and FIG. 3 is a block diagram showing an example of a conventional back color generating device. It is. 1...Position data sawtooth wave generation circuit, 2...
... Fundamental wave/harmonic generation circuit, 3... Waveform synthesis circuit, 4, 5... Back color generation circuit, 6... Video mixing amplification circuit. Patent Applicant: NEC Corporation Agent Masaki Yamakawa (T≧2 people) Figure 1 Figure 3

Claims (1)

[Claims] There is a position data sawtooth wave generation circuit that independently generates horizontal and vertical components of position data as a sawtooth wave whose value changes every vertical television cycle, and a position data sawtooth wave generation circuit that receives the output of this position data sawtooth wave generation circuit and generates horizontal and vertical components. A fundamental wave/harmonic generation circuit that generates the fundamental wave or harmonics of the vertical television period, a waveform synthesis circuit that receives and synthesizes the outputs of the fundamental wave/harmonic generation circuit, and the output of this waveform synthesis circuit. An active back color system characterized by comprising a video mixing amplification circuit that receives the output of the first back color generation circuit and the output of the second back color generation circuit to generate and output a moving back color. Generator.