JPS6359196A - Delaying device - Google Patents

Abstract

PURPOSE:To independently change the quantity of delay of a luminance signal component included in a video signal and the quantity of delay of a chrominance signal component and to simultaneously obtain by repeatedly inputting a part of the video signal to a line memory by the use of a memory of a large capacity. CONSTITUTION:The video signal is inputted from a signal terminal 21, delayed by one line in the line memory 23 using a delay element through a multiplexer 22, distributed in a distribution circuit 24 and supplied to a flip flop 25 and a picture element exchange circuit 26. In the line memory 23 and the picture element exchange circuit 26, a processing is executed by a clock 2 having the clock rate of the frequency twice of the sampling rate of an input signal. In the picture element exchange circuit 26, the two picture elements of the video signal delayed in the line memory 23 are combined to one set, an operation for switching mutual positions is performed and they are guided to a terminal different from a terminal to which the input signal of the multiplexer 22 is supplied. Thereby, the video signal having the partly different quantity of delay can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method in which a luminance signal and a chrominance signal are time-division multiplexed within a horizontal scanning period, and for the chrominance signal, a wideband signal and a narrowband signal are transmitted in a line-sequential manner. The present invention relates to a color television signal processing device.

BACKGROUND OF THE INVENTION In digital signal processing of television signals, a line memory is utilized which provides a time delay corresponding to a horizontal scanning period for two-dimensional processing.

In addition, for three-dimensional processing, the signal needs to be scanned in a vertical scanning period.

Field memories and the like that cause delays are also used.

One method of transmitting television signals is to time-division multiplex the luminance signal and color signal as shown in FIG. An analog component transmission method that transmits data in a line-sequential manner arranged every other line can be considered, but in processing such signals, for example, the luminance signal is delayed by one line, and the color signal is delayed by two lines. When outputting both at the same time, the most common method is to connect two stages of line memories that delay the signal for one line in cascade, extract the chrominance signal part from the final output, and extract the luminance signal part from the taps in the middle for processing. It is used.

A conventional example related to the present invention will be described below with reference to the drawings.

Figure 7 shows an example of a delay device for delaying the luminance signal part by one line and the chrominance signal part by two lines in a television signal in which the luminance signal and chrominance signal are time-division multiplexed and transmitted. be.

The video signal input from the signal terminal 11 is sent to the FIFO (Fi
The signal is delayed by one line in the first line memory 12 using a delay element such as a memory (rst-In First-Out), and further delayed by one line in the second line memory 13. The output of the first line memory 12 becomes an input of the second line memory 13 and simultaneously becomes one input of the multiplexer 14. Further, the output of the second line memory 13 becomes the other input of the multiplexer 14, and the multiplexer 14 uses the Y/C signal, which is a control signal to distinguish between the luminance signal part and the color signal part within the horizontal scanning period. During the period when the luminance signal is transmitted, the luminance signal delayed by one line, which is the output of the first line memory 12, is transmitted, and during the period when the color signal is transmitted, the luminance signal, which is the output of the second line memory 13, is delayed by two lines. Select the color signal and connect it to signal output terminal 1.
Send it to 5.

Problems to be Solved by the Invention In the conventional device, the above configuration has a capacity for one line when simultaneously outputting a luminance signal delayed by one line and a color signal delayed by two lines. The configuration is such that two stages of line memories are connected in cascade, and the chrominance signal part is taken out from the final output, and the luminance signal part is taken out and processed from an intermediate tap, so a number of line memories equal to the maximum delay amount of the video signal is required. However, there was a problem in that the circuit size had to be large.

In view of this point, the present invention provides a single line having a capacity of two or more lines.
An object of the present invention is to provide a delay device that can independently change the delay amount of a luminance signal component and the delay amount of a color signal component included in a video signal by using a large capacity memory.

Means for Solving the Problems According to the present invention, a portion of the video signal that has passed through the delay circuit that delays the signal for one horizontal scanning period is passed through the delay circuit again. The signal component delayed by the scanning period and the signal component delayed by two horizontal scanning periods are simultaneously obtained, and the luminance can be adjusted by changing the selection conditions of the input signal to the delay fA position that holds the signal for one horizontal scanning period. The delay amount of the signal and the color signal can be independently set in either one horizontal scanning period or two horizontal scanning periods, and the signal components having different delay amounts can be simultaneously obtained.

According to the above-described configuration, the present invention repeatedly inputs a portion of a time-division multiplexed video signal to a line memory configured with a large-capacity memory, thereby generating a video signal having partially different delay amounts using a small-scale circuit configuration. can be obtained.

Examples Examples of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a delay device according to the present invention.

In FIG. 1, a video signal in which a luminance signal and a chrominance signal are time-division multiplexed within a horizontal scanning period is input from a signal terminal 21, and sent via a multiplexer 22 to an FIFO.
(First-In First-Out) The signal is delayed by one line in the line memory 23 using a delay element such as a memory. The one-line/delayed video signal is distributed by a distribution circuit 24 and supplied to a flip-flop 25 and a pixel exchange circuit 26, which will be described later.

The line memory 23 and the pixel exchange circuit 26 perform processing using a clock 2 having a clock rate twice the sampling rate of the input signal.

Further, a flip-flop 25, which will be described later, performs processing using a clock 1 having the same frequency as the sampling rate of the input signal.

In the pixel exchange circuit 26, the two pixels of the video signal delayed by the line memory 23 are combined into a pair, and their positions are swapped. be guided.

As an example of a specific configuration is shown in FIG. 2, the control circuit 27 controls the luminance signal portion and the color signal during the horizontal scanning period such that the luminance signal portion is at the logic “1” level and the color signal portion is at the logic “0” level. Y/C, which is a control signal for distinguishing between
A signal and a clock 1 having the same frequency as the sampling rate of the input signal are input, and the logical product of both signals is calculated to control the delay amount of the luminance signal portion and the delay amount of the color signal portion of the input video signal. Generate a signal.

In the multiplexer 22, the output signal from the pixel exchange circuit 26 is added as the music input, and both are switched by the control signal from the control circuit 27, but the luminance signal portion remains unchanged, and the color signal portion is input to the input signal 1.
Four signals are stored in the line memory 23 by compressing the human input signal and the delayed signal into 1 m in time for a pixel and compressing the signal into two pixels.

More specifically, in the luminance signal portion where the Y/C signal indicates a logic "1" level, the input signal is led to the line memory 23 twice in succession at the rate of clock 2, and the Y/C@
In the color signal part where the signal indicates the logic "O" level, the input signal is time-compressed to half the sampling rate in the time of one pixel of the input signal, and the signal is delayed by one line with the signal supplied from the pixel exchange circuit. are multiplexed and guided to the line memory 23.

The flip-flop 26 uses the clock 1 to select the signal with the least amount of delay, which is placed every other video signal in the line memory 23 and is processed by the clock 2, and which is a set of two pixels. A luminance signal delayed by one line and a color signal delayed by two lines are selected, and a desired video signal is sent out from the output terminal 28.

Next, FIG. 3 shows a second embodiment of the delay device according to the present invention. In FIG. 3, the same parts as those in FIG. 1 are given the same numbers, and the circuit operations are also the same, so the explanation will be omitted.

The control circuit 37 in FIG. 3 uses a control signal for distinguishing between the luminance signal part and the chrominance signal part in the horizontal scanning period, such that the luminance signal part is set to logic "1 level" and the color signal part is set to logic "0 level level". In addition to a certain Y/C signal and a clock 1 with the same frequency as the sampling rate of the input signal, calculate the delay amount of the luminance signal portion and the delay amount of the color signal portion using the logic shown in the table on the next page. Y/C which is logically operated using the control signals of the above two peers, with a 2-bit control signal for independently setting 1 line or 2 lines as input.
By calculating the logical product of the signal and clock 1, a signal for controlling the delay amount of the luminance signal component and color signal component of the input video signal is generated.

An example of a specific configuration of the control circuit 37 is shown in FIG.

This is done by calculating the logical sum of the input signal and bit ○ of the control signal, calculating the exclusive logical sum of the output and bit 1 of the control signal, and then calculating the logical product of the result with clock 1. is supplied to the multiplexer 22 as a switching control signal. This control signal is “oo”
(The order is bit 1, bit o, and so on.) The luminance signal is delayed by 1 line and the chrominance signal is delayed by 2 lines. "01" is a delay of 2 lines for both the luminance signal and chrominance signal, and "10" is the luminance signal. 2 lines delay for signal, 1 line delay for color signal, ” 1
The delay device of the present invention is controlled so that both the luminance signal and the chrominance signal are delayed by one line at 1''.

Although the embodiments of the present invention have been described with respect to a line memory using a shift register type FIFO memory, it is also possible to use a random access memory by changing the configuration, and a field memory that performs field delay is also applicable. It is clear that similar effects can be obtained.

Effects of the Invention The delay device according to the present invention uses a large-capacity memory and repeatedly inputs a part of the video signal to the line memory, thereby controlling the delay amount of the luminance signal component and the delay of the color signal component included in the video signal. It becomes possible to change the amount independently and obtain them simultaneously, which has a great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a delay device in a first embodiment of the present invention, FIG. 2 is a specific configuration diagram of a control circuit in FIG. 1, and FIG. 3 is a block diagram of a delay device in a second embodiment of the present invention. A block diagram of the device, FIG. 4 is a specific configuration diagram of the control circuit in FIG. 3, FIG. 5 is a signal waveform diagram of the time division multiplexed signal, and FIG. 6 is a diagram of scanning in the color signal portion of the time division multiplexed signal. FIG. 7, which is a diagram showing the state of line sequential operation, is a block diagram of a conventional delay device. 11.21... Input terminal, 12, 13.23.
... Line memory, 14.22 ... Multiplexer, 15.28 ... Output terminal, 24.
...Distribution circuit, 25...Flip-flop, 26...Pixel exchange circuit, 27.37...
...Control circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 L ---

Claims (2)

[Claims] (1) A color television signal processing device in which a luminance signal and a chrominance signal are time-division multiplexed and transmitted within a horizontal scanning period, in which a Y/C signal indicating a multiplexing position of the luminance signal and chrominance signal is transmitted. A delay device for controlling the delay of a television signal, comprising: a delay circuit that delays a color television signal via a multiplexer; a distribution circuit that distributes the television signal that has passed through the delay circuit; and one of the distribution circuits. a pixel exchange circuit that pairs two output pixels and exchanges signal positions with each other; a multiplexer that switches and multiplexes the output signal of the pixel exchange circuit and the color television signal; and a control circuit which takes the Y/C signal as one of its inputs in order to switch between the signal component and the signal component, so that the signal component delayed by one horizontal scanning period and the signal component delayed by two horizontal scanning periods are provided at the other output of the distribution circuit. A delay device characterized in that a delayed signal component is obtained. (2) In a control circuit that receives a Y/C signal as input, the Y
2. The delay device according to claim 1, wherein the delay time of a luminance signal and a color signal included in a color television signal can be independently controlled by inverting or setting the polarity of the /C signal to a constant value.