JPS59204393A - Line sequential signal transmitter - Google Patents

Abstract

PURPOSE:To reduce deterioration phenomenon characteristic of a line sequential system by stopping sending a video signal which is transmitted by the 1st frame at the 2nd frame, and transmitting a video signal whose transmission is stopped at the 1st frame by the 2nd frame. CONSTITUTION:While two frames are regarded as a unit of one picture, two out of three kinds of video signal are transmitted on line sequential basis; and one of two kinds of video signal is transmitted at the 1st frame and not transmitted at the 2nd frame, and the other signal is not transmitted at the 1st frame and transmitted at the 2nd frame in a horizontal scanning period wherein horizontal scanning numbers of the 1st and the 2nd frames are equal to each other. Consequently, when a picture is projected on a TV receiver finally through those transmission systems and viewed as if three kinds of signals are transmitted successively by the afterimage effect of the image receiving tube of the TV receiver and the afterimage effect of the eyes of a viewer. Those afterimage effects reduce the deterioration phenomenon characteristic of the line sequential system.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a continuous color video signal, such as a Y signal, which is composed of three types of video signals.

Of the R-Y signal and the B-Y signal, the Y signal is transmitted continuously, and the R-Y signal and the B-Y signal are sequentially converted into signals for each horizontal scanning line and transmitted. It can be used in a video signal converter for satellite broadcasting that broadcasts line-sequential video signals, a video tape recorder that records and reproduces line-sequential video signals, and the like.

Conventional configuration and its problems As a device using the line sequential video signal method, there is a device using the SECAM method, or a device that converts the N-TSC signal into a line sequential video signal and then transmits the line sequential video signal (recording and playback). A number of devices have been proposed.

However, in these line-sequential video signals, information is thinned out for each horizontal scanning line and transmitted, so the S/
Although there are many advantages such as improving N and expanding the one-dimensional frequency band, there is a problem that deterioration peculiar to the line sequential method appears in diagonal line images with high color saturation, so continuous signal systems (for example, NTSC signals or It has not yet become as popular as PAL signals.

Purpose of the Invention The present invention solves the above-mentioned conventional problems, and provides a method for improving line sequential processing by allocating the reduction in information amount caused by line sequential processing to improving S/N and expanding one-dimensional frequency bands. The object of the present invention is to provide a line sequential signal transmission device that reduces the deterioration phenomenon peculiar to the line sequential method while still allowing the use of the line sequential method.

Structure of the Invention In order to achieve the above-mentioned object, the present invention makes a continuous color video signal composed of three types of video signals into one set of images with two frames. The second frame of the three types of video signals has the same horizontal scanning line number in the second frame. Among the third video signals, the video signal to be transmitted in the first frame is configured to stop transmission in the second frame, and the video signal to be transmitted in the first frame is configured to be transmitted in the second frame. be.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the drawings. 1st
The figure shows a block diagram of main parts of an embodiment of the line sequential signal transmission device of the present invention, and shows input terminals 1. Decoder 2. Vertical synchronization signal separation circuit (hereinafter referred to as vSS)7. Perimeter 8. Horizontal synchronization signal separation circuit (hereinafter referred to as H8S)9. +Frequency divider 10. Switch 11. Switch 12. It is composed of a Y signal output terminal 13 and a line sequential color signal output terminal 14.

For example, an NTSC color video signal as illustrated in FIG. 2 (2L) is applied to the input terminal 1. In that case, the decoder 2 receives the NT supplied to the decoder input terminal 3.
Using a well-known circuit configuration, the SC color video signal is separated into three types of video signals, such as the Y signal, the R-Y signal, and the B-Y signal. -Y signal output terminal 6 respectively. Figure 2 (e
), (f).

Shown in (g). Further, the H3S9 uses a well-known circuit configuration to separate the horizontal synchronizing signal, and, for example, the A20
It is assumed that a horizontal synchronizing signal from which the equalization pulse has been removed is output by using a circuit (not shown) or the like.

Assume that in such a circuit configuration, an NTSC color video signal as shown in FIG. 2(a) is supplied to the input terminal 1. At the output end of H859, a horizontal synchronizing signal H as shown in FIG. 2(b) is obtained. This horizontal synchronizing signal H is divided by a sufficient frequency divider 10 and output to the Q terminal.

The signals shown in Fig. 2(c) and (d) are obtained at the Q terminal.

This sufficient frequency unit 1Q is constituted by a normal flip-flop circuit, and is reset by a reset signal R once every two frames, which will be described later. The Q terminal and the Q terminal are connected to a switch 11, and the movable piece of the switch 11 is controlled by a pulse signal P having a period of two frames, which will be described later. As a result, when the P signal is at the H level, the output pulse of the Q terminal becomes the output signal of the switch 11, and when the P signal is at the L level, the output pulse of the Q terminal becomes the output signal of the switch 11.

On the other hand, a vertical synchronizing signal (2) as shown in FIG. 3(a) is output from the output end of vSS7. vss is typically comprised of a low-pass filter (not shown), a Schmitt circuit (not shown), etc. This vertical synchronizing signal V is frequency-divided by a sufficient frequency divider 8 to obtain a pulse signal P as shown in FIG. 3(b). The sufficient frequency converter 8 is composed of, for example, two stages of flip-flop circuits (not shown). The pulse signal P is
As described above, the movable piece of switch 11 is controlled. As a result, two frames are transferred to the output terminal of the switch 11.
A signal having a period of two horizontal open period intervals whose phase is inverted for each frame is obtained. This signal controls the movable piece of switch 12. The switch 12 is connected to the RY signal output terminal 5 and the BY signal output terminal 6 of the decoder 2, and when the output signal of the switch 11 is at H level, the switch 12 outputs the RY signal. When the output signal of the switch 11 is at L level, the switch 12 outputs the BY signal. As a result, the line-sequential color signal output terminal 14 transmits two frames as one set, and the inner box of the R-Y signal and B-Y signal, which have the same horizontal scanning line number in the first and second frames, is transmitted in one frame. The transmission of one of the R-Y signal and the B-Y signal is stopped in the second frame, and the other of the R-Y signal and the B-Y signal, the transmission of which is stopped in the first frame. is transmitted in the second frame. That is, for an image made up of two frames, the above-mentioned transmission device transmits all information. An example of the output signal waveform of the line sequential color signal output terminal 14 is shown in FIG.

Note that the reset signal R for resetting the sufficient frequency generator 10 is as follows:
It is obtained by differentiating the output signal of the sufficient frequency unit 8 using a differentiating circuit 15. The reset signal R is shown in Fig. 3(c).
Shown below.

Note that in the above explanation, the Y signal, R-Y signal, and B-Y signal were used as examples of three types of video signals, but the G signal, R signal, and B signal, or the Y signal
This also holds true with a combination of signals, engineering signals, and Q signals.

Further, if a signal indicating two frames every two frames is required for each signal output from the Y signal output terminal 13 and the line sequential signal output terminal 14, the output signal of the sufficient frequency divider 8 is processed, It may be added to the output signal of the Y signal output terminal 13 and each signal output from the line sequential color signal output terminal.

Effects of the Invention As is clear from the above description, according to the present invention, two of three types of video signals are transmitted line-sequentially using two frames as a unit of one set of images, and , 1st.
During the horizontal scanning period in which the horizontal scanning line numbers in the second frame are the same, one of the two types of video signals is transmitted in the first frame, not in the second frame, and the other signal is transmitted in the second frame. Since the image is not transmitted in one frame but in the second frame, the image is finally displayed on the television receiver through these transmission systems, and when viewed, there is an afterimage on the picture tube of the television receiver. Due to the effect and the afterimage effect of the human eye, it appears as if three types of signals were transmitted in succession. In particular, the effect is great when two types of video signals related to color signals are selected as line sequential signals.

These afterimage effects can reduce the deterioration phenomenon peculiar to the line-sequential method, and can allocate the reduction in information amount caused by line-sequentialing to improving the S/H of the transmission system, or improve the one-dimensional frequency band. The advantages of the line-sequential method can be taken advantage of, such as by allocating it to enlargement of the data.

[Brief explanation of drawings]

FIG. 1 is a block diagram of main parts showing a configuration example of a line sequential signal transmission device according to the present invention, FIG. 2 is a signal waveform diagram of each part of FIG. 1, and FIG. 3 is a diagram of another part of FIG. 1. It is a signal waveform diagram of each part. 7... Vertical synchronization signal separation circuit, 8...
Sufficient frequency generator, 9...Horizontal synchronization signal separation circuit, 1o
・°゛°°Periodometer, 11...-Switch, 12
・・・・・・Switch, 16・・・Differential circuit.

Claims (1)

[Claims] Of the continuous color video signals made up of three types of video signals, the first video signal is continuously transmitted, and the second. A device that sequentially converts a third video signal into a signal for each horizontal scanning line and transmits the signal, in which two frames constitute one set of images, and the first
．． The second frame having the same horizontal scanning line number in the second frame. Among the third video signals, the video signal transmitted in the first frame is configured to stop transmission in the second frame, and the video signal whose transmission is stopped in the first frame is transmitted in the second frame. line sequential signal transmission equipment.