JPH0712209B2 - Television waveform generator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a waveform generator for a television, and more particularly to a waveform generator capable of obtaining a special effect.

[Prior Art] Conventionally, in a waveform generating apparatus of this type of television, an offset data generating circuit for generating offset data receives only aspect data and generates offset data. The aspect only worked.

[Problems to be Solved by the Invention] In the above-described conventional television waveform generator, since the aspect in the cutting direction is not effective, the two waveform generators generate waveforms of complementary sizes by one fader control data. Effects that occur (hereinafter referred to as A & B effects)
In the aspect effect in the case of (1), since the waveforms generated by the respective waveform generators change only in the cutting directions, there is a drawback that a complementary aspect effect in which the contact is maintained cannot be obtained.

[Means for Solving the Problems] Means for solving the above problems in the present invention are as follows.
A television waveform generator includes a horizontal period fundamental wave generating circuit for generating a fundamental wave of a horizontal television period, a vertical period fundamental wave generating circuit for generating a fundamental wave of a vertical television period, aspect control data, and master / slave. An offset data generating circuit for calculating offset data having a predetermined relationship upon receiving a switching signal and outputting the offset data, and adding each output of the offset data generating circuit and each output of the horizontal and vertical cycle fundamental wave generating circuits A first and second adder circuit, a non-additive mixing circuit that receives the outputs of the first and second adder circuits and performs waveform synthesis, and an output waveform that receives the output of the non-additive mixing circuit and fader control data And a waveform shaping circuit that does this.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is an operation explanatory diagram.

The waveform shown in FIG. 2A will be described as an example. In FIG. 1, reference numerals 1 and 2 denote horizontal and vertical television cycle fundamental wave generating circuits, which respectively generate horizontal and vertical television cycle fundamental sawtooth waves as shown in FIG. 2 (b). An offset data generation circuit 5 receives a master / slave switching signal and aspect control data and outputs horizontal and vertical offset data, respectively. FIG. 2C shows horizontal offset data at the time of master and slave. The horizontal axis is the aspect control data,
The vertical axis is offset data. When the aspect is off, offset data of 0 is output in both the horizontal and vertical directions. Reference numerals 3 and 4 denote first and second adder circuits, and the first and second adder circuits 3 and 4 add the above offset data and the sawtooth wave of the horizontal and vertical scanning periods, respectively. 6
Is a non-adding mixing circuit which receives the outputs of the first and second adding circuits 3 and 4 and outputs a three-dimensional waveform as shown in FIG. 2 (d). Reference numeral 7 denotes a waveform shaping circuit, which slices the three-dimensional waveform output at 6 on a slice plane determined by the fader control data. The shaded portion shown in FIG. 2 (d) is the final output waveform shape.

When an aspect is applied in the horizontal direction, the offset data in the vertical direction remains 0, but in the horizontal direction in FIG. 2 (c).
As shown in FIG. 2, when the offset data corresponding to the aspect control data is output at the time of master and at the time of slave, and is added to the sawtooth wave of the horizontal scanning period by the first adder circuit 3, FIG. As shown, in the final output waveform, only the horizontal component changes like the shaded area.

FIG. 3 is a system diagram of an A & B effect device using two television waveform generators according to this embodiment.

In FIG. 3, reference numeral 8 denotes a CPU, which receives the fader data, the waveform No. and the aspect data, and controls the first and second waveform generators 9 and 10. CPU8 is the master waveform
When No is received, the signal indicating that the waveform No. and master / slave switching signal are master is determined for the special effect waveform generator on the master side, and the slave side is determined for the slave side and the master waveform is determined according to the master waveform. The waveform No. of the slave waveform that is being generated is used as the first and second waveform generators 9,
Give to 10. Further, the fader control data gives the slave side fader control data such that the contact points of the output waveforms of the waveform generators 9 and 10 are continuously maintained with respect to the master side fader control data.

This will be described with reference to FIG.
When the waveform of FIG. 4A is selected, the waveform of FIG. 4B is selected on the slave side, and the contact of each output waveform of the master side and the slave side is maintained as shown in FIG. 4C. Similarly, give fader control data to the slave side.

The first and second waveform generators 9 and 10 also receive the same aspect control data and output keys 1 and 2 respectively. 11
Is a key control circuit, which receives the keys key1 and key2 and controls which key is finally used. A gain control circuit 12 receives the outputs of 11 and the input video signals A and B, and outputs a composite image with the contact maintained as shown in FIG. 4 (c).

When aspect ratio is applied here, the first from 8 CPUs
And when the same aspect control data x is given to the second waveform generators 9 and 10, as shown in FIG. 2 (c), the offset data becomes a value of 1,000 y in the master / slave,
Contact can be maintained even when an aspect is applied as shown in FIG. 4 (d).

[Effects of the Invention] As described above, according to the present invention, by inputting the master / slave switching signal to the offset data generation circuit, the aspect can be made to work in the direction opposite to the direction of cutting the waveform. A & B using 2 units
With respect to the effect, by setting one as a master and the other as a slave, it is possible to maintain the contact points of the respective waveforms even with respect to the movement of the fader control data, so that complementary aspects can work.

[Brief description of drawings]

FIG. 1 is a block diagram of a television waveform generator according to the present invention, FIGS. 2 (a) to 2 (e) are operation explanatory diagrams of an embodiment, and FIG. 3 is a television waveform generator according to the present invention. System diagram of A & B effect device using 2 units, Fig. 4 (a)
9A to 9D are waveform explanatory diagrams of the A & B effect. 1: Horizontal period fundamental wave generation circuit 2: Vertical period fundamental wave generation circuit 3: First addition circuit 4: Second addition circuit 5: Offset data generation circuit 6: Non-addition mixing circuit 7: Waveform shaping circuit

Claims (1)

[Claims] 1. A horizontal period fundamental wave generating circuit for generating a fundamental wave of a horizontal television period, a vertical period fundamental wave generating circuit for generating a fundamental wave of a vertical television period, an aspect control data and a master / slave switching signal. To calculate offset data having a predetermined relationship and output the offset data, and to add each output of the offset data generating circuit and each output of the horizontal and vertical cycle fundamental wave generating circuits. A second adder circuit, a non-additive mixing circuit that receives the outputs of the first and second adder circuits and synthesizes waveforms, and a waveform that receives the output of the non-additive mixing circuit and fader control data and shapes the output waveform A waveform generator for a television, comprising: a shaping circuit.