JPH0620271B2 - Special effect waveform generator - Google Patents

Description

The present invention relates to a special effect waveform generator used in an image adjusting device. In particular, the present invention relates to a device for generating a graphic or a graphic whose aspect ratio is changed from the screen by rotating the X and Y axes by an angle θ on a screen displayed by a horizontal / vertical operation on a television screen.

[Conventional technology]

FIG. 8 is a block diagram of a conventional special effect waveform generator.

The horizontal fundamental wave generating circuit 81 generates a fundamental wave signal having a horizontal period such as a sawtooth wave, a triangular wave, and a parabolic wave. Adder circuit 84
Modulates the fundamental wave signal with the modulated wave signal output from the modulated wave generation circuit 83. The multiplication circuit 85 multiplies the modulated fundamental wave signal and the aspect ratio control signal 106 and outputs the result.

The vertical fundamental wave generating circuit 82 generates a fundamental wave signal having a vertical period such as a sawtooth wave, a triangular wave, or a parabolic wave. The multiplication circuit 86 multiplies the fundamental wave signal and the aspect ratio control signal 107 and outputs the result. The output waveform signals of the multiplication circuit 85 and the multiplication circuit 86 are added by the addition circuit 87. The horizontal fader control signal 181 is input to the slice circuit 88, and fader control and slicing of the output waveform signal of the adder circuit 87 are performed. The vertical fader control signal 182 is input to the slice circuit 88, and the output fader control and slice of the vertical circuit 86 are performed. The output waveform signal of the slicing circuit 88 and the output waveform signal of the slicing circuit 89 are combined by the waveform synthesizing circuit 90 to become the special effect waveform output signal 111.

The special effect waveform generator having such a configuration performs modulation in the horizontal direction, but does not perform modulation in the vertical direction.

Further, the aspect ratio of the waveform signal may change due to the fader control in the horizontal and vertical directions, which makes it difficult to maintain the aspect ratio of 4 to 3.

In addition, it was not possible to rotate the waveform signal.

[Problems to be solved by the invention]

INDUSTRIAL APPLICABILITY The present invention enables rotation of a special effect waveform on the screen, vertical modulation, rotation of a waveform signal with a changed aspect ratio as it is, and removal of an aspect shift due to fader operation. The purpose is to provide a generator.

[Means for solving problems]

The special effect waveform generator of the present invention is characterized in that a sawtooth wave signal having a horizontal period and a vertical period is rotated and a fundamental wave signal is formed by the rotated sawtooth wave signal.

That is, according to the present invention, a sawtooth wave generating means for generating two sawtooth wave signals of a horizontal period and a vertical period, and a processing for obtaining a special effect on an image are performed on the two sawtooth wave signals to obtain fundamental waves. In a special effect waveform generator comprising a processing means for generating a signal and a waveform synthesizing circuit for synthesizing these fundamental wave signals to generate a special effect waveform for image display, the processing means comprises two sawtooth waves. The waveform rotation circuit that converts the signal to the sawtooth wave signal for the two axes on the coordinate axis rotated by the angle θ given by the two-dimensional coordinate axis on the image, and the angle using the output waveform signal of this waveform rotation circuit and a fundamental wave generating means for generating a fundamental wave signal on a coordinate axis rotated by θ.

Since the processing for obtaining the special effect waveform is performed after rotating the sawtooth wave signal, the control data and the waveform rotation angle θ can be changed linearly.

The processing means may include means for modulating at least one of the two sawtooth signals.

It is preferable that the processing means also includes means for controlling the aspect ratio of the output waveform signal of the waveform rotation circuit or the output waveform signal of the fundamental wave generation means.

[Action]

The special effect waveform generator according to the present invention generates the fundamental wave signal by the sawtooth wave signal on the coordinate axis where the XY coordinates are rotated, and thereby equivalently rotates the output waveform signal of the waveform synthesizing circuit.

Further, the modulated output waveform signal can be rotated as it is, and the aspect-shaped waveform signal can be rotated as it is.

〔Example〕

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

FIG. 1 is a block diagram of a special effect waveform generator according to an embodiment of the present invention.

The horizontal sawtooth wave generation circuit 1 and the horizontal modulation wave generation circuit 3 are
It is connected to the adder / subtractor circuit 5. The vertical sawtooth wave generation circuit 2 and the vertical modulation wave generation circuit 4 are connected to an adder / subtractor circuit 6. The addition / subtraction circuit 5 is connected to the horizontal input of the waveform rotation circuit 7, and the addition / subtraction circuit 6 is connected to the vertical input of the waveform rotation circuit 7.

The output X of the waveform rotation circuit 7 is connected to the triangular wave shaping circuit 8. One of the output X of the waveform rotation circuit 7 and the output of the triangular wave shaping circuit 8 is selectively connected to the multiplication circuit 10 by the selection switch S ₁ . The multiplication circuit 10 is a parabolic wave shaping circuit.
Connected to 12. One of the output of the multiplication circuit 10 and the output of the parabolic wave shaping circuit 12 is connected to the subtraction circuit 14 and the waveform synthesis circuit 16 by the selection switch S ₅ . Subtraction circuit 14
Is connected to the waveform synthesis circuit 16.

The output Y of the waveform rotation circuit 7 is connected to the triangular wave shaping circuit 9. One of the output Y of the waveform rotation circuit 7 and the output of the triangular wave shaping circuit 9 is selectively connected to the multiplication circuit 11 by the selection switch S ₂ . The multiplication circuit 11 is a parabolic wave shaping circuit.
Connected to 13. One of the output of the multiplication circuit 11 and the output of the parabolic wave shaping circuit 13 is connected to the subtraction circuit 15 and the waveform synthesis circuit 16 by the selection switch S ₆ . Subtraction circuit 15
Is connected to the waveform synthesis circuit 16.

The waveform synthesis circuit 16 is connected to the addition / subtraction circuit 17. The adder / subtractor circuit 17 is connected to the waveform shaping circuit 18.

The horizontal sawtooth wave generation circuit 1 has a horizontal harmonic control signal 101
And the horizontal position control signal 103 are input. A vertical harmonic control signal 102 and a vertical position control signal 104 are input to the vertical sawtooth wave generation circuit 2. The rotation angle control signal 105 is input to the waveform rotation circuit 7. The X-direction aspect ratio control signal 106 is input to one of the multiplication circuit 10 and the subtraction circuit 14 via the selection switch S ₃ . The Y-direction aspect ratio control signal 107 is input to one of the multiplication circuit 11 and the subtraction circuit 15 via the selection switch S ₄ . The waveform selection signal 108 is input to the waveform synthesis circuit 16. Addition / subtraction circuit 17
A fader control signal 109 is input to. Waveform shaping circuit
A soft width control signal 110 is input to 18.

The horizontal sawtooth wave generation circuit 1 generates a horizontal sawtooth wave signal by the horizontal harmonic control signal 101 and the horizontal position control signal 103, and the vertical sawtooth wave generation circuit 2 generates a vertical harmonic control signal 102. A vertical sawtooth wave signal is generated by the vertical position control signal 104.

The horizontal modulation wave generation circuit 3 and the vertical modulation wave generation circuit 4 are
Generates modulated waveform signals such as sine waves and triangle waves.

The adder / subtractor circuit 5 and the adder / subtractor circuit 6 add / subtract the sawtooth wave signal and the modulated waveform signal. As a result, a waveform signal equivalent to the waveform signal whose position is moved at high speed by the sawtooth wave generation circuits 1 and 2 is obtained.

The waveform rotation circuit 7 outputs the output waveform signal of the addition / subtraction circuit 5 and the output waveform signal of the addition / subtraction circuit 6 to the rotation angle control signal 105.
Calculate based on. The output X and the output Y of the waveform rotation circuit 7 are expressed as X = H · cos θ + V · sin θ (1) Y = −H · sin θ + V · cos θ (2). Here, the output X corresponds to a horizontal input signal H and the output Y corresponds to a sawtooth wave signal obtained by rotating the vertical input signal V by an angle θ.

The triangular wave shaping circuit 8 and the triangular wave shaping circuit 9 generate a triangular wave signal by the rotated sawtooth wave signal. The multiplication circuit 10 and the multiplication circuit 11 control the level of the input waveform signal and change the aspect ratio of the waveform signal output by the waveform synthesis circuit 16.

The parabolic wave shaping circuit 12 and the parabolic wave shaping circuit 13 generate a parabolic wave signal. These output waveform signals are used for producing a circular waveform signal, etc., and are selectively connected to the subtraction circuits 14 and 15 by the selection switch S ₅ and the selection switch S ₆ .

The subtraction circuits 14 and 15 receive signals from the selection switch S ₅ and the selection switch S ₆ and their aspect ratio control signals when the X-direction aspect ratio control signal 106 and the Y-direction aspect ratio control signal 107 are input, respectively. And subtract. Thus, when the waveform synthesizing circuit 16 synthesizes the waveform signals by non-additive mixing, the aspect ratio of the synthesized waveform signals is changed. The reason for performing the subtraction is that the aspect is applied only in the direction in which the size of the combined waveform signal increases, and the waveform signal can be cut out by the fader operation.

The waveform synthesizing circuit 16 synthesizes waveform signals by combining various fundamental waves and adding or non-adding and mixing them in accordance with the waveform selection signal 108.

The adder / subtractor circuit 17 changes the offset of the waveform signal by adding / subtracting the fader control signal 109 to / from the waveform signal.

The waveform shaping circuit 18 performs soft width control and slicing of the slope of the input waveform signal by the soft width control signal 110. As a result, the special effect waveform signal output 110 is obtained.

2 to 4 are diagrams showing examples of output waveform signals of the vertical sawtooth wave generation circuit 2 or the vertical sawtooth wave generation circuit 3.

FIG. 2 shows an output waveform signal when the number of harmonics is 1 and the position is at the center.

FIG. 3 shows an output waveform signal when the number of harmonics is 2 and the position is at the center.

FIG. 4 shows an output waveform signal when the number of harmonics is 1 and the position is moved to the left.

FIG. 5 is a diagram showing an example of an output waveform signal of the addition / subtraction circuit 5 or the addition / subtraction circuit 6.

FIG. 6 is a diagram showing an example of the output waveform signal of the waveform rotation circuit 7.

When θ is 45 ° in equations (1) and (2), Becomes FIG. 6 shows the contour lines for these equations.

FIG. 7 is a diagram showing an example of changes in aspect due to output waveform signals of the subtraction circuits 14 and 15.

In this example, a waveform signal of a vertical triangular wave and a calculated horizontal triangular wave (shown by a broken line) is shown.

[Effects of the Invention] As described above, the special effect waveform generator of the present invention modulates a sawtooth wave signal having a horizontal period and a vertical period, and then rotates the sawtooth wave signal to obtain an equivalent signal. A triangular wave signal is formed from the sawtooth wave that is rotated in the vertical direction, and then the aspect ratio processing is performed. This enables modulation in the horizontal direction and the vertical direction, allows the waveform signal to be rotated with the aspect applied, and has an effect that the aspect change does not occur due to the fader operation.

Therefore, according to the present invention, there is an effect that the shape of a figure that can be electronically formed is not limited in principle.

[Brief description of drawings]

FIG. 1 is a block diagram of a special effect waveform generator according to an embodiment of the present invention. FIG. 2 is a diagram showing an output waveform signal of the sawtooth wave generation circuit when the high frequency is 1 and the position is the center. FIG. 3 is a diagram showing an output waveform signal of the sawtooth wave generation circuit when the number of harmonics is 2 and the position is at the center. FIG. 4 is a diagram showing an output waveform signal of the sawtooth wave generation circuit when the number of harmonics is 1 and the position is moved to the left. FIG. 5 is a diagram showing an example of an output waveform signal of the addition / subtraction circuit. FIG. 6 is a diagram showing an example of an output waveform signal of the waveform rotation circuit. FIG. 7 is a diagram showing an example of changes in aspect. FIG. 8 is a block diagram of a conventional special effect waveform generator. 1 ... Horizontal sawtooth wave generation circuit, 2 ... Vertical sawtooth wave generation circuit, 3 ... Horizontal modulation wave generation circuit, 4 ... Vertical modulation wave generation circuit, 5, 6 ... Addition / subtraction circuit, 7 ... Waveform Rotating circuit,
8, 9 ... Triangular wave shaping circuit, 10, 11 ... Multiplication circuit, 12,
13 ... Parabolic wave shaping circuit, 14, 15 ... Subtraction circuit, 16 ...
… Waveform synthesis circuit, 17 …… Addition / subtraction circuit, 18 …… Waveform shaping circuit, 81 …… Horizontal fundamental wave generation circuit, 82 …… Vertical fundamental wave generation circuit, 83 …… Modulation wave generation circuit, 84 …… Addition / subtraction circuit, 85,
86 …… Multiplier circuit, 87 …… Adder circuit, 88, 89 …… Slice circuit, 90 …… Waveform synthesis circuit.

Claims (3)

[Claims] 1. A sawtooth wave generating means for generating two sawtooth wave signals having a horizontal period and a vertical period, and a processing for obtaining a special effect on an image is performed on the two sawtooth wave signals, and each of them is basically processed. In a special effect waveform generator comprising a processing means for generating a wave signal and a waveform synthesizing circuit for synthesizing these fundamental wave signals to generate a special effect waveform for image display, the processing means comprises: A waveform rotation circuit that converts the sawtooth wave signal into a sawtooth wave signal for two axes on the coordinate axis that is rotated by the angle θ given by the two-dimensional coordinate axis on the image, and the output waveform signal of this waveform rotation circuit. And a fundamental wave generating means for generating a fundamental wave signal on a coordinate axis rotated by the angle θ using the special effect waveform generator. 2. The special effect waveform generator according to claim 1, wherein said processing means includes means for modulating at least one of said two sawtooth wave signals. 3. The method according to claim 1, wherein the processing means includes means for controlling an aspect ratio of the output waveform signal of the waveform rotating circuit or the output waveform signal of the fundamental wave generating means. The described special effect waveform generator.