JPH0683393B2 - Active back color generator - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an active back color generator used to give a special effect to a television image, in particular mixing two back color signals. The present invention relates to an active back color generator that generates various active back color signals.

[Conventional technology]

FIG. 4 is a block diagram showing an example of a conventional active back color generator, which has a configuration in which back color generators 3, 4 and a video mixing amplifier 5 and a special effect waveform generator 6 are combined. . The back color generators 3 and 4 respectively output back color signals for displaying the designated color uniformly on the entire screen. The image mixing amplifier 5 mixes the two back color signals from the back color generators 3 and 4 according to the mixing control signal 15 generated by the special effect waveform generator 6 and outputs the mixed back color signals as an active back color signal 14.

The special effect waveform generator 6 has a vertical scanning wave generator 61, a horizontal scanning wave generator 62, and a waveform generator 63. The vertical scanning wave generation unit 61 and the horizontal scanning wave generation unit 62 control the harmonic order control data signal 10 for controlling the number of waves generated in the vertical and horizontal scanning periods and the start point (phase) of the generated wave. Position control data signal for controlling 11
In the vertical scanning period and the horizontal scanning period, generates a signal of a predetermined waveform and outputs the signal to the waveform generation unit 63. The waveform generation unit 63 receives the output signals of the vertical scanning wave generation unit 61 and the horizontal scanning wave generation unit 62, respectively, performs synthesis and waveform shaping, and generates the mixing control signal 15.

Now, assuming that the harmonic order control data signal 10 is specified to generate two waves each in the vertical and horizontal scanning periods, and the waveform of the mixing control signal 15 is sawtooth, the active back color signal 14 is used. The output screen is the fifth
As shown in the figure, diagonal color patterns in which the mixing ratio of the two colors continuously changes are displayed in each of the four divided screens. Here, for example, the f part is the back color generator 3
If it is the color of the signal from the back color generator 4, the part g is a color obtained by mixing half of the colors of the signals from the back color generators 3 and 4, and the part h is the color of the signal from the back color generator 4. It is in color. Also, by controlling the position control data signal 11 to change the start point of the generated wave,
It is possible to move the color patterns in each of the four divided screens so as to continuously flow.

[Problems to be Solved by the Invention]

The conventional active back color generator described above is
An active back color signal is obtained by combining two back color generators, a special effect waveform generator, and a video mixing amplifier, but the vertical scanning wave generator and horizontal scanning of the special effect waveform generator are performed. Since the mixing control signal is generated from the waves independently generated in the wave generator, when the harmonic order control data signal is designated to generate a plurality of waves, as shown in FIG. However, the same color pattern is divided and displayed on the screen and cannot be displayed as a single color pattern on the entire screen. Therefore, there is a drawback that it is not possible to cope with diversification of the background color.

An object of the present invention is to provide an active background color that can be displayed as a single color pattern on the entire screen as shown in FIG. 3 without the color pattern formed by mixing two colors being divided into a plurality of parts on the screen. An object is to provide an active back color generator that generates a signal.

[Means for Solving the Problems]

The active back color generator of the present invention includes a harmonic order control data signal for controlling the number of waves generated in the vertical scanning period and the horizontal scanning period, and a position control data signal for controlling the starting point of the generated wave. A vertical scanning wave generator for receiving a signal having a predetermined waveform during a vertical scanning period, a first input terminal for receiving the harmonic order control data signal, and a second input terminal for receiving the position control data signal. And an output signal from the vertical scanning wave generator in place of the position control data signal, while receiving the harmonic order control data signal at the first input end. And a horizontal scanning wave generator for generating a predetermined waveform signal in the horizontal scanning period, and two back color generators for respectively generating back color signals. , And a video mixing amplifier to be mixed in accordance with the back color signals from these two background color generator on an output signal of the horizontal scanning wave generator.

〔Example〕

 The present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an active back color generator of the present invention. A vertical scanning wave generator 1 is shown in FIG.
, Horizontal scanning wave generator 2 and back color generators 3, 4
And a video mixing amplifier 5. Here, the back color generators 3 and 4 generate different back color signals and output them to the video mixing amplifier 5,
Generates an active back color signal 14 by mixing two back color signals according to the output signal 13 of the horizontal scanning wave generator 2.

The vertical scanning wave generator 1 generates an output signal 12 having a predetermined waveform in the vertical scanning period in accordance with the harmonic order control data signal 10 supplied to the input terminal 1a, and the position control data supplied to the input terminal 1b. The start point of the output signal 12 is changed according to the signal 11. Note that the harmonic order control data signal 10
Is a data signal for designating the number of waves (order) generated in each of the vertical scanning period and the horizontal scanning period,
The position control data signal 11 is a data signal for controlling the phase of the generated wave and changing the start point of the output signal.

The horizontal scanning wave generator 2 has the same function as the vertical scanning wave generator 1, and the harmonic order control data signal is input to the input terminal 2a.
Upon receiving 10, the output signal 13 having a predetermined waveform is generated in the horizontal scanning period, and the start point of the output signal 13 is changed according to the signal supplied to the input end 2b. Here, the output signal 12 of the vertical scanning wave generator 1 is supplied to the input end 2b.

Now, for example, the vertical scanning wave generator 1 generates a sawtooth wave,
It is assumed that the harmonic order control data signal 10 specifies the order 2. At this time, if the position control data signal 11 is not supplied, the vertical scanning wave generator 1 operates as shown in FIG.
As shown in FIG. 2, two sawtooth waves are generated in the vertical scanning period and output as the output signal 12. Here, if the position control data signal 11 is supplied, the position control data signal
The start point of the output signal 12 changes according to the amplitude of 11.

Further, the horizontal scanning wave generator 2 is assumed to generate a sawtooth wave similarly to the vertical scanning wave generator 1, and if a signal is not supplied to the input end 2b, the harmonic order control data signal 10 becomes the order 2.
2 is specified, two sawtooth waves are generated and output as the output signal 13 in the horizontal scanning period as shown in FIG. 2 (b). If the output signal 12 of the vertical scanning wave generator 1 shown in FIG. 2 (a) is supplied to the input end 2b, the output signal
The start point of the output signal 13 changes according to the amplitude of 12.
That is, when the output signal 12 shown in FIG. 2 (a) changes from the point S1 of the minimum amplitude to the point S4 of the maximum amplitude, the horizontal scanning wave generator 2 causes each point S1 on the waveform of the output signal 12 to change. , S2, S3, S
2 (b), (c), (d), (e) corresponding to 4
As shown in FIG. 5, the output signal 13 whose position is shifted in the horizontal direction is generated for each horizontal scanning line.

The video mixing amplifier 5 outputs the output signal 13 of the horizontal scanning wave generator 2.
The two back color signals are mixed according to
The back color signal 14 is generated. In this case, the output signal
When the amplitude of 13 is the minimum, the two back color signals are 1: 0.
Mix at a ratio of 0: 1 for the maximum, and 0: 1 for the opposite, and 1: 1 for an intermediate value.

FIG. 3 shows an output screen of the active back color signal 14 thus generated. Here, the point S1 shown at the upper left corner of the screen is the output signal 13 shown in FIG. 2 (b).
Corresponding to the start point S1 and the mixing ratio of the two colors changes according to the amplitude of the output signal 13 as it moves horizontally from the left end to the right end. In addition, the point S on the left side of the screen
2 and S3 correspond to the start points S2 and S3 of the output signal 13 shown in FIGS. 2 (c) and 2 (d), respectively.
4 corresponds to the starting point S4 of the output signal 13 shown in FIG. 2 (e). The lower half of the screen is the same as the upper half. Therefore, the colors having the same mixing ratio are arranged in the diagonal direction of the screen and displayed as one color pattern on the entire screen. Further, by controlling the position control data signal 11, for example, the start point of the output signal 12 shown in FIG.
By continuously changing from S4 to S4, the color pattern displayed on the entire screen can be continuously moved from the lower right corner to the upper left corner of the screen.

〔The invention's effect〕

As described above, according to the active back color generator of the present invention, the vertical scanning wave for generating the signals of the predetermined waveforms in the vertical and horizontal scanning periods according to the harmonic order control data signal and the position control data signal, respectively. Using the generator and horizontal scanning wave generator, supply the output signal of the vertical scanning wave generator to the input terminal for the position control data signal of the horizontal scanning wave generator, and mix the output signal of the horizontal scanning wave generator with the video. By supplying the two back color signals to the amplifier, it is possible to easily generate an active back color signal which can be displayed as one color pattern on the entire screen without being divided on the screen as in the past. Therefore, there is an effect that the special effect of the television image can be further diversified.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a signal waveform diagram for explaining the operation of the embodiment shown in FIG. 1, (a) shows the waveform of the output signal 12 of the vertical scanning wave generator 1, and (b) to (e) ) Indicates the waveform of the output signal 13 of the horizontal scanning wave generator 2. FIG. 3 is an output screen view of the active back color signal generated by the output signal 13 having the waveform shown in FIGS. 2 (b) to (e). FIG. 4 is a block diagram showing an example of a conventional active back color generator, and FIG. 5 is a diagram showing an example of an output screen of an active back color signal generated by the conventional device shown in FIG. is there. 1 ... Vertical scanning wave generator, 2 ... Horizontal scanning wave generator, 3,
4 …… Back color generator, 5 …… Video mixing amplifier, 10
...... Harmonic order control data signal, 11 …… Position control data signal, 12 …… Vertical scanning wave generator 1 output signal, 13
... output signal of horizontal scanning wave generator 2, 14 ... active back color signal, 1a, 2a ... input terminal for harmonic order control data signal, 1b, 2b ... input terminal for position control data signal .

Claims (1)

[Claims] 1. Vertical scanning by receiving a harmonic order control data signal for controlling the number of waves generated in a vertical scanning period and a horizontal scanning period and a position control data signal for controlling the starting point of the generated wave. A vertical scanning wave generator for generating a signal of a predetermined waveform during a period, a first input end for receiving the harmonic order control data signal, and a second input end for receiving the position control data signal, respectively. Having the harmonic order control data signal as the first
And a horizontal scanning wave generator which receives an output signal from the vertical scanning wave generator instead of the position control data signal at the second input terminal and generates a signal having a predetermined waveform during a horizontal scanning period. And two back color generators for respectively generating back color signals, and a video mixing amplifier for mixing the back color signals from these two back color generators in accordance with the output signal of the horizontal scanning wave generator. An active back color generating device characterized by comprising.