JPS63196177A - Video producing switcher - Google Patents

Abstract

PURPOSE:To easily obtain an arbitrary pattern used for a masking signal to eliminate an unrequired signal or the synthesis of picture planes, by providing a frame memory to store a pattern generated from a wipe pattern generator, a feedback circuit to connect the output and the input of the frame memory, and an OR circuit. CONSTITUTION:The required number of wipe pattern generators is suppressed at the minimum sets by arranging the frame memory 4 at a part requiring a static pattern and by a method to store a desired pattern respectively. In an actual using method, the output of the wipe pattern generator is distributed by arranging the frame memory 4 at every place of a video producing switcher requiring a wipe pattern, and the frame memory 4 outputs a fixed pattern, or control whether the pattern supplied by the wipe pattern generator should be passed as it is, is performed by performing write control on the frame memory 4.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a video production switcher used for production and editing of television video, and particularly relates to the effective use of a wipe pattern generator used to synthesize a plurality of video signals. .

[Prior art] In a normal medium-sized or large-sized video production switcher,
As shown in FIG. 6, it has two to three mixing amplifiers 1, and is also provided with a wipe pattern generator 2 that generates a composite waveform. For example, in the wipe mode, the wipe pattern generator 2 is activated as shown in FIG. ), the output of the mixing amplifier 1 is a combination of the video signals of inputs 1 and 2 selected by the input selection switcher 3, as shown in FIG. You can obtain a video signal with a high quality.

Mixing amplifier 1 switches between input 1 and input 2 according to a given pattern. Such a combination is used as a transition state during switching from input 1 video to input 2 video (or vice versa), or simply as a static state combination. The mixing amplifier 1 shown in FIG.
Yl,2 (external key signal) is given to . In this manner, the mixing amplifier 1 switches between the two images according to the supplied external key signals and outputs a combined image signal in a mode other than the MIX mode.

Recently, more complex video production has been performed, and the number of mixing amplifiers 1 and wipe pattern generators 2 used in video production switchers is increasing. Furthermore, when the mixing amplifier 1 is a 3-man-powered 2-mixing amplifier as shown in FIG.
is required, thus increasing costs. Furthermore, it is no exaggeration to say that it is meaningless from the perspective of the visual effect that a plurality of wipe pattern generators 2 are used at the same time and that they are all used in a transition state. Therefore, conventionally, by providing frame memories 4a and 4b for storing the wipe patterns generated by the wipe pattern generator 2, effective video synthesis has been performed using a smaller number of wipe pattern generators. That is, in the example of the vJS diagram, the mixing amplifiers 1 and 1 are provided with frame memories 4a and 4b, and the frame memory 4a.

The output of one wipe pattern generator 2 is given to both inputs of 4b.

The frame memories 4a and 4b are connected to the wipe pattern generator 2.
It is possible to pass through the generated pattern as is, or to output a memorized pattern for one television frame. If only the frame memories 4a and 4b are read, a temporally fixed pattern will appear in the output. For example, if the frame memory 4a stores a circular pattern and the frame memory 4b passes the rectangular pattern currently generated by the wipe pattern generator, the output signal of the video production switcher will be the An image as shown in FIG. 9 is obtained.

In this example, the size and position of the rectangular pattern can be changed by controlling the wipe pattern generator 2, but the size and position of the circular pattern cannot be changed because it is stored in the frame memory 4a in advance. That is, in this case, only a rectangular pattern can be used as a scene change pattern. However, as described above, a screen effect in which two patterns change simultaneously is rarely required.

In addition, the wipe pattern generator 2 is used not only to generate patterns for simple screen composition, but also to mask unnecessary parts of input external key signals and remove unnecessary parts of superimposed video signals. is also used.

(This is also one of the reasons why a large number of wipe pattern generators 2 are required.) In this way of using wipe pattern generators, a stationary pattern is sufficient;
A stand-alone wipe pattern generator is sufficient in most cases.

[Problems to be Solved] In the conventional video production switcher described above, by providing a frame memory, it is possible to effectively utilize a small number of wipe pattern generators. However, the only pattern stored in the frame memory is the pattern generated by the wipe pattern generator, and when the pattern is used as a mask signal to remove unnecessary parts of the video signal to be superimposed due to defects in the telop card, etc. , is often insufficient.

That is, when an unnecessary signal 5 as shown in FIG. 10 is applied, it cannot be removed using a normal wipe pattern, so there is a problem in that a plurality of wipe pattern generators and frame memories must be used.

[Means for Solving Interconnection Points] The present invention, which solves the above-mentioned conventional interoperability points, is a video production switcher that has a wipe pattern generator that generates various patterns and synthesizes video signals. The configuration includes a frame memory that stores a pattern generated by a wipe pattern generator used in the amplifier, and a feedback circuit and an OR circuit that connect the output and input of the frame memory.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

The present invention uses a conventional wipe pattern generator 2 and one frame memory 4 to generate an arbitrary pattern in a video production switcher as shown in FIG. FIG. 1 is a simple system diagram of a frame memory having a feedback circuit and an OR circuit. Individually, there is a feedback circuit and an OR circuit, so if a given pattern has a different position or size for each TV frame, it can be accumulated one after another to obtain a pattern like the one shown in Figure 2. I can do it. Wipe the pattern input to this circuit,
It is easy to generate any complex pattern as long as the size and position of the various patterns generated by the pattern generator are changed. Furthermore, in order to change the shape of a pattern once stored in the frame memory by cutting it, the input circuit of the frame memory may be configured as shown in FIG.

In video production switchers where all signal processing is done in the digital domain, wipe patterns are transferred as digital signals, but in analog video production switchers, a frame memory with the configuration shown in Figure 4 is used. . That is, it has an AD converter and a DA converter, converts a pattern signal given as an analog signal into digital and stores it, and converts the signal read from the memory into analog and passes it to a mixing amplifier or the like. In this case, the number of bits of the AD/DA converter is usually about 8 bits, but 1 bit is sufficient in places where the pattern signal is simply used as a mask signal.

As described above, in the present invention, the wipe pattern generator 2 is constructed by arranging the frame memory 4 at a location where a static pattern is required and storing a desired pattern in each location.
The number of required units is minimized. Video production switchers that require a wipe pattern in actual usage
A frame memory 4 is arranged at every location to distribute the output of the wipe pattern generator 2, and by controlling the writing of the frame memory 4, the frame memory 4 can output a fixed pattern or the pattern given by the wipe pattern generator 2. Controls whether to pass through as is. That is,
If writing is prohibited, the pattern given at that time is retained and remains in the memory, and if writing continues, a changing pattern is output.

[Effects of the Invention] As explained above, the present invention has a frame memory that stores a pattern generated by a wipe pattern generator, and a feedback circuit and an OR circuit that connect the output and input of the frame memory. This has the effect of being able to obtain a mask signal for removing unnecessary signals and any pattern used for screen composition without using a wipe pattern generator or frame memory.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a frame memory having a feedback circuit according to the present invention, Fig. 2 is a diagram showing accumulated pattern signals, Fig. 3 is a system diagram for deleting accumulated pattern signals, and Fig. 4 is a system diagram of a frame memory having a feedback circuit according to the present invention. The configuration diagram of the frame memory, Figures 5 and 6 are the system diagrams of a conventional video production switcher, Figure 7 (a) is a diagram showing an example of a wipe pattern, and Figure 7 (b) is the output of the mixing amplifier. Figure 8 is a diagram showing an example of a video signal; Figure 8 is a system diagram of a three-man power two-mixing amplifier; Figure 9 is a diagram showing an example of combining three video signals; Figure 10 is a diagram showing a superimposed signal. It is. 1: Mixing amplifier 2: Wipe pattern generator 3: Video input 4: Frame memory

Claims (1)

[Claims] In a video production switcher that has a wipe pattern generator that generates various patterns and synthesizes video signals,
A video production switcher comprising a frame memory that stores a pattern generated by a wipe pattern generator used for a plurality of video mixing amplifiers, and a feedback circuit and an OR circuit that connect the output and input of the frame memory.