JPH05128243A - Digital video signal special effect device - Google Patents

Abstract

PURPOSE:To operate an inserting processing without dividing the color signal of a digital video signal into color difference signals R-Y and B-Y. CONSTITUTION:An input signal inputted from an input terminal 1 is transmitted to a delay apparatus a switcher 4. The out of the delay apparatus transmitted to a delay 3 and the switcher 4. The outputs of the delay apparatus 3 and the switcher 4 are respectively transmitted to a storage part 6 and 7, and written according to a write-in address outputted from a write-in address generator 8. Signals read from the storage parts 6 and 7 according to a read-out address outputted from a read-out address generator 9 are transmitted to a delay apparatus 13 and a subtracter 12 of an interpolation circuit. The output of the subtracter 12 is multiplied by an interpolation coefficient outputted from a read only memory 17 by a multiplier 14. The output of the multiplier 14 is added to the output of the delay apparatus 13 by an adder 18, and outputted from an output terminal 19. Thus, a digital special effect device whose circuit constitution is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video signal special effect device, and more particularly to improvement of a memory circuit and an interpolation circuit.

[0002]

Conventionally, the memory circuit and the interpolation circuit of this kind of digital special effects device, a color signal of a video signal (described as hereafter C _R) color difference signals R-Y and B-Y (and hereinafter C _B Description)
It was stored separately and interpolated.

[0003]

Since the digital video special effect apparatus processes the color signal by dividing it into the C _R signal and the C _B signal, it is necessary to dispose two circuits for the color signal. It was

An object of the present invention is to provide a digital video signal special effect device capable of processing a color signal by a circuit of one system.

[0005]

In order to achieve the above object, in a digital video signal special effect device according to the present invention, there is provided a digital video signal special effect device having a memory circuit and an interpolation circuit. The circuit has two delay devices arranged in series, which delay the digitized video input signal by one clock of the video signal sampling clock, and stores a switching device for switching each input signal and the output of the delay device and the switching device. The interpolation circuit has a memory, and the interpolation circuit delays one of the two input signals, a subtractor that subtracts the two input signals, an output of the subtractor and a read-only memory. A multiplier that multiplies the output, an adder that adds the output of the multiplier and the output of the delay device, and an interpolation coefficient that is converted into an interpolation coefficient of two chrominance signals of a luminance signal and a color signal In a bowl Those having a read-only memory that out.

Further, the memory circuit has a write address generator for generating a write address of the memory and a read address generator for generating a read address of the memory and an interpolation coefficient to be sent to the interpolation circuit. It is a thing.

[0007]

The function of converting the color signal of the digital video signal into the color difference signal RY
Interpolation processing is performed without dividing into B and Y.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, the storage circuit and the interpolation circuit in the digital video special effect apparatus of the present invention are arranged in series with two delay units 2 and 3 for delaying the input signal by one clock to switch each input signal. Switching device 4 and delay device 3
And the outputs of the switch 4 to the storage devices 6 and 7, the write address generator 8 that generates the write addresses of the storage devices 6 and 7, and the read addresses and the interpolation circuits of the storage devices 6 and 7. A read address generator 9 for generating an interpolation coefficient, a delay device 13 for delaying one of the two input signals, a subtracter 12 for subtracting the two input signals, an output of the subtractor 12 and read-only Memory 1
7 for multiplying the output of 7 and an adder 18 for adding the output of the multiplier 14 and the output of the delay device 13 and the interpolation coefficient between the two color difference signals of the luminance signal and the color signal of the video signal. Read-only memory 17 for converting into an insertion coefficient and sending it to the multiplier 14.
Have and.

The digital signal input from the input terminal 1 is sent to the delay device 2 and the switching device 4. The output of the delay device 2 is sent to the delay device 3 and the switching device 4. In the switching device 4, a luminance signal (hereinafter referred to as Y) and a chrominance signal (hereinafter referred to as C) are switched by a switching signal (input from the input terminal 5), when Y, the output side of the delay device 2, and when C, the delay device. Select the input side of 2. This is because when interpolating two data interpolation circuit after, performs the interpolation in the data between the two clocks in the case of Y, the case of C, 1 data per clock C _R, C _B ，
To change C _R, C _B ... and, to do the interpolation of the same type of signal, it is necessary to use two clocks every data.

The outputs of the delay device 3 and the switching device 4 are stored in the storage devices 6 and 7 according to the write address generator 8. The signal written in the memory is read according to the read address output from the read address generator 9 and sent to the interpolation circuit.

The signal A input from the input terminal 10 of the interpolation circuit is sent to the delay unit 13 and the subtractor 12. The signal B input from the input terminal 11 is sent to the subtractor 12, where BA is performed with the signal A.

The output of the subtractor 13 is sent to the multiplier 14,
The signal k from the read-only memory 17 is multiplied by k (B-
A) is output. The signal k from the read-only memory outputs the Y interpolation coefficient or the C interpolation coefficient according to the signal from the read address generator 9 and the Y-C switching signal input to the input terminal 16.

[0014] interpolation coefficients for C is, C _R is further input to the input terminal 20, by C _B switch signal is switched to the interpolation coefficients of the interpolation coefficients and for C _B for C _R.

By the above method and the above-mentioned method of writing the C signal in the memory, the C signal can be processed by the same circuit as Y without being separated into C _R and C _B signals. The outputs of the multiplier 14 and the delay unit 13 are added by the adder 18, and the signal A + k (BA) obtained by interpolating the A signal and the B signal is output to the output terminal 19.

[0016]

As described above, according to the present invention, by combining the Y-C switch and the read-only memory, the chrominance signal of the video signal can be processed by one system of circuit like the luminance signal. it can.

[Brief description of drawings]

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

[Explanation of symbols]

 2,3 Delay device 6,7 Memory device 8 Write address generator 9 Read address generator 12 Subtractor 13 Delay device 14 Multiplier 17 Read only memory 18 Adder

Claims (2)

[Claims] 1. A digital video signal special effect device having a storage circuit and an interpolation circuit, wherein the storage circuit delays the digitized video input signal by one clock of a video signal sampling clock. It has two switching devices arranged in series and switching each input signal, and a storage device that stores the output of the delay device and the switching device. The interpolation circuit stores one of the two input signals. A delay device that delays, a subtracter that subtracts two input signals, a multiplier that multiplies the output of the subtractor and the output of the read-only memory, and an adder that adds the output of the multiplier and the output of the delay device. And a read-only memory for converting an interpolation coefficient into an interpolation coefficient of two color difference signals of a video signal and a color signal and sending the read coefficient to a multiplier. .. 2. The memory circuit includes a write address generator for generating a write address of the memory device, and a read address generator for generating a read address of the memory device and an interpolation coefficient to be sent to an interpolation circuit. The digital video signal special effect device according to claim 1, wherein the special effect device is a digital video signal special effect device.