JPS63316574A - Video signal synthesizer - Google Patents

Abstract

PURPOSE:To remove a field delay difference and to attain smooth image movement by adding a variable delay circuit to a digital video specific effect(DVE) generator, a video synthesizing circuit, a key signal generating circuit and a control circuit for managing size processing. CONSTITUTION:The DVE generator 5 executes size processing based on a key signal or a signal outputted from a control circuit 7 and a signal to which a contraction effect is added is supplied to the video synthesizing circuit 4. The circuit 4 synthesizes plural video signals based on a key signal obtained through a variable delay circuit 8 and supplies the synthesized signal to an output terminal 3. The delay circuit 8 can vary a delay variable in each field to absorb the delay of the DVE generator 5 in each field. Since a field delay difference is removed, a gap based upon a response time difference is removed and a smooth image movement can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television transmission device, and particularly to a video synthesis device for synthesizing video signals.

[Conventional technology]

A conventional video compositing device is shown in FIG.

In the figure, input video signals are supplied to input terminals 11 and 12. The input video signal is sent to a digital special effect generator (hereinafter referred to as a DVE device) 15 and a video synthesis circuit 14.
supplied to In addition to the video synthesis circuit 14, there is a control circuit 17 that manages size processing, a key signal generation circuit 16 that receives the control signal and generates a key signal, and a control circuit 16 that generates a size using the key signal or the control signal from the control circuit 17. There is a DVE equipment @15 determined by

The output video signal that has undergone size processing and reduction effects is
The signal is supplied to the video synthesis circuit 14. The video synthesis circuit 14 synthesizes a plurality of videos using the key signal from the key signal generation circuit 16 and supplies the synthesized video to the output terminal 13.

Figure 4 shows an example of this effect.

A wipe signal C is generated in the key signal generation circuit from the control circuit. The DVE device 15 receives the b signal and uses the wipe signal C to perform a reduction effect as shown in d.

The video synthesis circuit 14 combines figures a and b with the wipe signal of figure C to obtain figure e.

[Problem that the invention seeks to solve]

However, when the wipe waveform is moved by the control circuit 17, the size of the diagram d is determined in conjunction with the diagram C in the DVE device 15, so a field delay occurs due to the processing time of the DVE device 15. When the signal shown in Fig. d is combined with the signal shown in Fig. C in the video synthesis circuit 14, there is a difference in field delay, so there is a drawback that a gap occurs due to the difference in response time as shown in Fig. e.

SUMMARY OF THE INVENTION An object of the present invention is to provide a video signal synthesis device that solves the above-mentioned problems.

[Means for solving problems]

The present invention provides a video signal synthesis device for synthesizing a plurality of video signals, including a control circuit that manages size processing, a key signal generation circuit that operates based on control information from the control circuit, and a video signal input circuit that generates the key signal. a digital special effect generating device in which the size of a video signal is determined by a key signal from a circuit or a size control signal from the control circuit; and a digital special effect generating device that receives an output from the key signal generating circuit and is controlled by a control signal from the control circuit. A video signal synthesis circuit comprising: a variable delay circuit; and a video synthesis circuit that receives the output signal of the digital special effect generator and other video signals as input, and synthesizes a video signal using a key signal from the delay circuit. It is a device.

〔Example〕

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

In FIG. 1, the present invention includes a control circuit 7 that manages size processing, a key signal generation circuit 6 that operates based on the control signal output from the control circuit 7, and a key signal generation circuit 6 that inputs a video signal and receives the key signal from the key signal generation circuit 6 or the control a DVE device 5 whose size is determined by a size control signal from a circuit 7; and a variable delay circuit that receives the key signal, is controlled by a control signal from the control circuit 7, and absorbs the field delay of the DVE device 5. 8
and a video synthesis circuit 4 for synthesizing the output signal of the DYE device 5 and other video signals using the key signal.

In the figure, an input video signal is supplied to input terminal 1.2. The input video signal is supplied to the DVE device 5 and the video synthesis circuit 4. There is a control circuit 7 that manages size processing, a key signal generation circuit 6 that receives the control signal and generates a key signal, and a DVE device M5 whose size is determined by the key signal or the control signal from the control circuit 7. The size-processed and reduced output video signal is supplied to the video synthesis circuit 4. The video synthesis circuit 4 synthesizes a plurality of videos using a key signal passed from the key signal generation circuit 6 through the variable delay circuit 8, and supplies the synthesized video to the output terminal 3.

Here, the variable delay circuit 8 is for absorbing the delay in units of fields in the DVE device 5, and can vary the amount of delay in units of fields.

Figure 2 shows an example of this screen effect.

A wipe signal C is generated in the key signal generation circuit 6 by the control circuit 7. The DVE device 5 inputs the b signal, and uses the wipe signal C to perform a reduction effect as shown in the diagram d. The video synthesis circuit 4 combines the diagram a and the diagram b using the wipe signal C to obtain the diagram e. Here, when obtaining the composite screen of figure e, since figure b has been field delayed by the DVE device 5, by field delaying figure C by variable delay circuit 8, figure b and figure C can be obtained. are in phase. Thereby, even when the wipe signal is moved by the control circuit 7, smooth movement without any difference in response time can be realized as shown in the figure e.

In this embodiment, a wipe signal is used as an example, but it can be similarly implemented for all types of key signals, and if the field delay of the DYE device differs depending on the device, it can be adjusted using a variable delay circuit. be.

[Effects of the Invention] As described above, according to the present invention, since field delay differences are eliminated, gaps due to response time differences can be eliminated and smooth image motion can be realized.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a video synthesis device of the present invention, Fig. 2 is a diagram showing an example of a screen effect of the present invention, Fig. 3 is a circuit diagram of a conventional video synthesis device, and Fig. 4 is an example of a conventional screen effect. FIG. ], 2...Video input terminal 3...Video output terminal 4
...Video synthesis circuit 5...DVE (digital special effect generator) 6...Key signal generation circuit 7...
Control circuit 8...variable delay circuit

Claims (1)

[Claims] (1) A video signal synthesis device that synthesizes multiple video signals, including a control circuit that manages size processing, a key signal generation circuit that operates based on control information from the control circuit, and a video signal input and generation of the key signal. a digital special effect generating device in which the size of a video signal is determined by a key signal from a circuit or a size control signal from the control circuit; and a digital special effect generating device that receives an output from the key signal generating circuit and is controlled by a control signal from the control circuit. A video signal synthesis circuit comprising: a variable delay circuit; and a video synthesis circuit that receives the output signal of the digital special effect generator and other video signals as input, and synthesizes a video signal using a key signal from the delay circuit. Device.