JPS61214872A - Color television receiver - Google Patents

Abstract

PURPOSE:To display compound information by time-compressing and inserting an on-screen signal, etc., into the empty part by the time compression, so that a usual TV picture can be received by a high definition TV. CONSTITUTION:When switches S1 and S2 fall to an (a) side, a high definition picture can be watched, and when they fall to a (b) side, an NTSC signal can be received. R, G and B signals of an NTSC of the main signal are time- compressed by a time compressing circuit 2, drawn close to the left edge on a screen 1, formed so that 4:3 can be obtained on the displaying element and inputted into an adder synthetic circuit 3. At such a time, the R, G and B signals are time-compressed by 4/5 only. Next, a character generator 4 and a memory 5 for multiplexing the character can display an on-screen picture 6 and a character multiple picture 7 by devising the timing of the reading clock. A sub-signal enters an NTSC picture-in-picture circuit 8 and by devising the reading timing, a picture-in-picture picture 9 is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to color television receivers (hereinafter referred to as televisions), and in particular, to color television receivers (hereinafter referred to as televisions), and particularly to multi-system televisions that can switch between high-definition televisions, which will become popular in the future, and current standard televisions. This invention relates to a color television receiver.

High-definition televisions have an aspect ratio of 5:3, while regular televisions have an aspect ratio of 4:3. When switching between the two, a blank area occurs on the display element and the horizontal frequency changes to about 31kHz and about 1
I have to switch to 5 kHz and two.

Problems to be Solved by the Invention As described above, in the past, blank areas occur, but these blank areas are very unsightly and have the problem that display elements cannot be used effectively.

Means for Solving the Problems The present invention compresses the time of a video signal so that a normal television image can be received by a high-definition television receiver.
It is configured to display composite information by switching the horizontal deflection frequency and inserting on-screen signals etc. into blank areas by time compression.

Effect of the present invention With the above-described configuration, the present invention can switch and display a high-definition television image signal and a normal television image signal, and can also display one color of one picture of a normal television! Tongue 81mu ↓; -÷1+Danpachi Ito Ura Kojimoto and Rinbutsu can also be displayed on the table.

Example FIG. 1 shows an embodiment of the present invention.

In FIG. 1, 1 is a CRT screen, and the display elements on the screen 1 have an aspect ratio of 6:3. 81.32 is a switch. When the switch 81.32 is turned to the a side, a high-definition image can be seen, and when the switch S1.32 is turned to the b side, an NTSC signal can be received. Figure 2 shows this situation.
1 is a front view of a normal screen, and letter parts such as B, C, and D are on-screen or picture-in-picture parts, which will be described later. The main signal NTSC Fi-G-B signal is time-compressed by the time compression circuit 2, moved to the left edge of the screen 1, and formed so that 4=3 on the display element, and added/combined circuit 3
is input. At this time, the R4-B signal is time-compressed by 4/f5. For this purpose, COD may be used, or a digital signal may be converted into a memory. Since the method is already well known, it will be omitted.

Next, the on-screen character generator 4 and the character multiplexing memory 6 can be used for the on-screen screen 6 as shown in Figure 2 by devising the reading clock timing.
, a character multiplex screen 7 can be displayed.

The sub-signal enters the NTSC picture-in-picture circuit 6,
After all, if the read timing is adjusted, the picture-in-picture screen 9 as shown in FIG. 2 can be easily displayed. This is also well known in terms of circuits, so it will be omitted.

The deflection output circuit 1o mainly switches horizontal scanning. Since 1126 lines are proposed for high definition, the output operation for horizontal scanning corresponding to this is performed.

When NTS (j) is selected, the number can be changed to 625 by connecting the switch S2 to the b side.This is also a well-known circuit, so its explanation will be omitted.

As described above, according to this embodiment, the entire screen is scanned in order to effectively utilize the blank areas of a normal television screen. Then, since the image with an aspect ratio of 4:3 is displayed on a screen with an aspect ratio of 6:3, the horizontal area is stretched, and the time of the video signal is compressed in the horizontal direction.

This allows on-screen or picture-in-picture signals to be inserted into the remaining time, making effective use of the screen.

Effects of the Invention As described above, according to the present invention, a high-definition TV screen and a normal TV screen can be viewed on one TV, and other information such as picture-in-picture and on-screen can be viewed at the same time. .

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a color television receiver according to an embodiment of the present invention, Fig. 2) is a front view of a CRT screen when displaying the same high-definition screen, and Fig. 2 @) is a block diagram of a color television receiver according to an embodiment of the present invention.
FIG. 3 is a front view of a CRT screen when an SC signal reception screen is displayed. 1...Screen, 2...Time compression circuit, 3
... Addition/composition circuit, 4 ... Character generator for on-screen, 6 ... Video memory for character multiplexing, 8 ... NTSG picture-in-picture circuit, 10...M-Kurinshi Domoku Figure 1

Claims (1)

[Claims] The video signal is time-compressed so that a high-definition television receiver with a 5:3 aspect ratio can receive a normal television image with an aspect ratio of 4:3, and the horizontal deflection frequency is switched. A color television receiver configured to display composite information by inserting on-screen signals, text multiplex signals, picture-in-picture signals, etc.