JPH0445334Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a television transmission device, and particularly to a video synthesis device for synthesizing video signals.

[Conventional technology]

A conventional example is shown in FIG. In FIG. 3, an input video signal is supplied to the input terminal 11. The input video signal is supplied to a video synthesis circuit 14. DVE (digital special effects generator) from input terminal 12
An input video signal is supplied to 16. The control data from the size control data generation circuit 15 is sent to the DVE 16.
and is supplied to the waveform generator 17. The control signal from the waveform generation circuit 17 is supplied to the video synthesis circuit 14, and the video signal from the DVE 16 is converted into video signal 1.
Used to synthesize into 1.

FIG. 4 shows the state when the size control data changes from the minimum to the maximum. A1 to a5 indicate output signals of the waveform generator 17, which are circular waveforms and indicate that the position is moving to the lower left side. Here, when the size data reaches the maximum, it indicates that the image frame W is inscribed in the waveform.

b1 to b5 indicate output signals of the DVE 16, and position size control is performed in accordance with the output of the waveform generator. Here, b1 to b3 change in size from 0 to 1 times according to the size information, but b
4 and b5, the size will not change any further if the DVE does not have an enlargement function.

c1 to c5 are controlled by control signals of a1 to a5,
A case where b1 to b5 are synthesized with the video signal 11 by the video synthesis circuit 14 is shown.

Here, in c4 and c5, in b4 and b5
Since there is an upper limit to the size of the output video signal of the DVE 16, the extra video signal shown in the shaded area was output as a composite signal.

[Problem that the invention attempts to solve]

For this reason, after changing the size control data and reaching the maximum output video signal of the DVE, an unexpected extra video signal was output as an output composite signal.

SUMMARY OF THE INVENTION An object of the present invention is to provide a video signal synthesis device that prevents the output of redundant video signals.

[Means for solving problems]

The present invention includes a digital special effect generation device that receives a video signal as input and performs reduction using size control data from a size control data generation circuit, and a waveform generation device controlled by size control data from the size control data generation circuit. , a gate circuit that receives the key signal output of the digital special effect generator and the output of the waveform generator, and synthesizes the output video signal of the digital special effect generator with another video signal using the output key signal of the gate circuit. This is a video signal synthesis device characterized by comprising a video synthesis circuit.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, the present invention is controlled by size control data from a size control data generation circuit 5.
A DVE 6, a waveform generator 7, a gate circuit 8 that receives the key signal output of the DVE 6 and the output of the waveform generator 7, and converts the output video signal of the DVE 6 into another video signal using the output key signal of the gate circuit 8. It has a video synthesis circuit 4 for synthesizing the output synthesis signals, and has a function of completely synthesizing the output synthesis signal regardless of the size control data.

In the embodiment, an input video signal is supplied to an input terminal 1, and the input video signal is supplied to a video synthesis circuit 4. An input video signal is supplied from an input terminal 2 to a DVE (special effects generator) 6. The control data from the size control data generation circuit 5 is sent to the DVE6.
and is supplied to the waveform generator 7. The output key signal from the DVE 6 and the control signal from the waveform generator 7 are supplied to a gate circuit 8. The output control signal from the gate circuit 8 is supplied to the video synthesis circuit 4, and is used to synthesize the video signal from the DVE 6 into the video signal 11.

FIG. 2 shows a state in which the size control data is changed from the minimum to the maximum. a1 to a5 indicate output signals of the waveform generator 7, which are round waveforms and indicate that the position is moving to the lower left side. Here, when the size data reaches the maximum, it indicates that the image frame W is inscribed in the waveform.

b1 to b5 indicate output video signals of DVE6,
Position size control is performed according to the output of the waveform generator. Here, b1 to b3 change in size from 0 to 1 times according to the size information, but b
4. If b5 does not have an enlargement function in DVE6,
The size will not change any further. d1 to d5 are
This shows the key signal output of the DVE 6, and signals matching the video sizes b1 to b5 are output. here,
A control signal is generated by ANDing the figures a and d using a gate circuit, and the results of combining b1 to b5 into video signal 1 in the video synthesis circuit 4 are converted to c1 to c.
5.

Here, in c4 and c5, if the output video signal size of DVE6 reaches the upper limit, DVE6
Since the control signal is limited by the key signal in the gate circuit 8, a signal larger than the output video signal from the DVE 6 will not be generated as an output composite signal. As a result, no matter how the size control data changes, unnatural output will not occur as an output composite signal.

In this embodiment, the video synthesis circuit has two inputs, but
The present invention can also be implemented in a video synthesis circuit with three or more inputs, and the effect is obvious.

[Effect of idea]

As explained above, this invention does not generate a composite signal that exceeds the size of the output video signal from the DVE, so there is no unnatural output, and the output composite signal is completely synthesized regardless of the size control data. It has the effect that it can.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of the video synthesis device of the present invention, Figure 2
Figures a1-a5, b1-b5, c1-c5, d1-
d5 is a diagram showing an example of the screen effect of the present invention, FIG. 3 is a circuit diagram of a conventional video synthesis device, and FIG. 4 is a1 to a5,
b1 to b5 and c1 to c5 are diagrams showing examples of conventional screen effects. 1, 2...Video input terminal, 3...Video output terminal, 4...Video synthesis circuit, 5...Size control data generation circuit, 6...DVE (digital special effects generator), 7...Waveform generator , 8...gate circuit.

Claims (1)

[Scope of utility model registration request] a digital special effect generation device that receives a video signal and performs reduction using size control data from a size control data generation circuit; a waveform generation device controlled by size control data from the size control data generation circuit; a gate circuit that receives the key signal output of the special effect generator and the output of the waveform generator; and a video synthesis circuit that synthesizes the output video signal of the digital special effect generator with another video signal using the output key signal of the gate circuit. A video signal synthesis device characterized by comprising: