JPS6055773A - Generator of special effect waveform - Google Patents

Abstract

PURPOSE:To obtain a waveform generator of a TV special effect by processing both horizontal and vertical synchronous basic waves. CONSTITUTION:The output of a horizontal synchronous basic wave generating circuit 1 is supplied to the 1st and 3rd multiplier circuits 3 and 5. While the output of a vertical synchronous basic wave generator 2 is supplied to the 2nd and 4th multiplier circuits 4 and 6 respectively. The sine and cosine of the angle data supplied from a terminal 20 are calculated by the SIN and COS generating circuits 7 and 8 respectively. The output of the circuit 7 is supplied to the circuits 4 and 5: while the output of the circuit 8 is supplied to the circuits 3 and 6 for multiplication respectively. Then the outputs of circuits 3 and 4 are applied to an adder circuit 9; while the outputs of circuits 5 and 6 are applied to a subtractor circuit 10. Thus both addition and subtraction are carried out. The outputs of the circuits 9 and 10 are sliced by a fader through a waveform shaping circuit 11, and a special effect waveform is delivered through a terminal 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television special effects waveform generator, and more particularly to fundamental waveform processing techniques.

Generally, this kind of special effect waveform generator is used to switch between two television video signals according to the generated special effect waveform. That is, the switcher is operated using this special effect waveform as a key signal. Conventional television special effect waveform generators generate special effect waveforms using horizontal and vertical periodic fundamental waves (sawtooth waves, triangular waves, etc.), which makes it impossible to rotate this special effect waveform. Ta.

SUMMARY OF THE INVENTION An object of the present invention is to provide a television special effects waveform generator that is capable of rotating the generated waveform by processing fundamental waves of horizontal and vertical periods.

The special effect waveform generator of the present invention includes a horizontal fundamental wave generation circuit that generates a fundamental wave of a horizontal period, a vertical fundamental wave generation circuit that generates a fundamental wave of a vertical period, and the rotation by manually inputting angle data to be rotated. a sine and cosine generation circuit that outputs sine and cosine values of predetermined coefficients corresponding to angles, and first and fourth circuits that respectively multiply the outputs of the horizontal and vertical fundamental wave generation circuits by the outputs of the cosine generation circuit. a multiplier circuit, second and third multiplier circuits that respectively multiply the outputs of the vertical and horizontal fundamental wave generation circuits by the outputs of the sine generation circuit, and each output of the first and second multiplier circuits. A first addition circuit that adds together, a second addition circuit that adds each output of the third and fourth multiplication circuits, and slices each output of the first and second addition circuits using fader data. The waveform shaping circuit outputs a special effect waveform.

In the present invention, the fundamental wave of the horizontal period is manually inputted to the first and third multiplication circuits, the fundamental wave of the vertical period is manually inputted to the second and fourth multiplication circuits, and the sine and cosine of the manually inputted angle data are Calculate this using the SIN generation circuit and CO8 generation circuit.
The output of the IN generation circuit is input to the second and third multiplication circuits, and the output of this CO8 generation circuit is inputted to the first and fourth multiplication circuits to perform multiplication, respectively, and the output of the first and second By adding the outputs of the multiplier circuit in the adder circuit and subtracting the output of the third multiplier circuit from the output of the fourth multiplier circuit in the subtracter circuit, each output wave of the adder and subtracter circuits is faded by the waveform shaping circuit. A special effect waveform is obtained by performing a special effect waveform.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the invention.

In this figure, 1 is a horizontal period fundamental wave generation circuit, 2 is a vertical period fundamental wave generation circuit, 3 to 6 are first to fourth multiplier circuits, 7 is a SIN generation circuit, 8 is a COS generation circuit, and 9 is an addition circuit. 10 is a subtraction circuit, and 11 is a waveform shaping circuit. The output of the horizontal periodic fundamental wave generation circuit 1 is H1, the output of the vertical periodic fundamental wave generation circuit 2 is 1, the manual input θ from the angle data input terminal, the output of the addition circuit 9 is X, and the output of the subtraction circuit 10 is Y. The functions and operations of the constituent elements will be explained in order.

Figure 2 shows the horizontal and vertical periodic fundamental wave generation circuit 1 of Figure 1,
2 is a graph showing the level of a sawtooth wave generated in FIG. Here, for simplicity, the aspect ratio is assumed to be 1:1.

The outputs of the SIN and CO8 generation circuits 7 and 8 are sinθ and CO8θ. By inputting the signals from these four buildings to the first +2*3+4 multiplication circuits 3 to 6, respectively, and inputting the outputs to the addition circuit 9 and subtraction circuit 10, the fundamental waves shown in the following equations, X, Y is obtained.

X = H-cos θ+V-sin θ-・・−−−−
−・−1) Y=−H=sintl+V−cosθ−−−
--- (2) Here, X corresponds to the fundamental wave obtained by rotating H, and Y corresponds to the fundamental wave obtained by rotating V by an angle of 0. For example, θ
= 45°, the values of these two equations are shown by equal-level lines as shown in Figure 3 (a).
, As shown in (b), output fundamental waves X and Y are obtained by rotating input fundamental waves H and V by 45 degrees, respectively.

As is clear from the above explanation, since the input fundamental wave is rotated by the angle θ and the orthogonal relationship of the human-powered fundamental wave remains the same, the special effect waveform formed by this output external rotation is i according to the angle data θ. , the waveform is rotated by -3 angles.

In FIG. 1, the subtraction circuit 10 is used, but this is used as an addition circuit, and the SIN generation circuit 7 generates
It is clear that the same effect can be obtained as the present invention even when a coefficient `` is generated and inputted to the third multiplier circuit 5''.

Also, from equations (3) and (4) and Figure 3, the slope of the rotated fundamental wave remains constant even if the angle data θ is changed, so the soft width of the special effect waveform (the rise time of the key signal) is also constant regardless of the rotation angle of the waveform.

As described above, the present invention provides a switching method which is capable of rotating a special effect waveform by multiplying horizontal and vertical periodic fundamental waves by coefficients corresponding to angle data, and which is interesting for switching television video signals. can do.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an output waveform diagram of the horizontal and vertical periodic fundamental wave generation circuit of FIG. 1, and FIGS. rotation angle of 45°
FIG. 3 is a plan view showing the output fundamental wave in the case of X and Y equal level lines. In the figure, 1...Horizontal period fundamental wave generation circuit, 2...Vertical period fundamental wave generation circuit, 3...First multiplier circuit, 4...・Second
multiplication circuit, 5...Third multiplication circuit, 6...
...4th multiplication circuit, 7...8IN generation circuit, 8...CO8 generation circuit, 9...addition circuit, 10...subtraction circuit , 11... Waveform shaping circuit. Representative Il 1 Patent Attorney Uchihara Shinho I Figure (1) (b) Tea 3 Figure

Claims (1)

[Claims] A horizontal fundamental wave generation circuit that generates a fundamental wave with a horizontal period, a vertical fundamental wave generation circuit that generates a fundamental wave with a vertical period, and a sine value of a predetermined coefficient corresponding to the rotation angle by inputting angle data to be rotated. a sine and cosine generation circuit that outputs a cosine value; and a first circuit that multiplies the outputs of the horizontal and vertical fundamental wave generation circuits and the output of the cosine generation circuit, respectively.
and a fourth multiplication circuit, second and third multiplication circuits that respectively multiply the outputs of the vertical and horizontal fundamental wave generation circuits by the outputs of the sine generation circuit, and the first and second multiplication circuits. a first addition circuit that adds each output of the
a second circuit that adds the respective outputs of the third and fourth multiplier circuits;
and a waveform shaping circuit that slices each output of the first and second adder circuits using fader data to output a special effect waveform.