JPH01146480A - High definition television receiver - Google Patents

Abstract

PURPOSE:To effectively utilize the display picture of the title high-definition television receiver by compressing the picture size of a current standard television signal with an address generating circuit at the time of signal reading from first - sixth field memories, and approximating it to the aspect ratio of a high definition television system. CONSTITUTION:For the signal entered from an input terminal 101, when a first field memory M1 is outputted, one horizontal scanning period is made into a half, the horizontal direction is time-compressed to 1/2, for a vertical direction, (N+3), (N+6), (N+9)... for one line portion out of three lines are successively thinned and processed. The current standard television signal given to input terminals 103-106 is controlled so as to be compressed by 1/4 in a horizontal direction, and by 1/3 in a vertical direction by third - sixth field memories M3-M6. Thus, the six outputs of the said first - sixth field memories compressed in the horizontal and vertical directions are synthesized by a synthesizing circuit 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high-definition television receiver.

Conventional technology High-definition television broadcasting aims to provide new appeal, such as power and presence that cannot be obtained with current television broadcasting, by displaying detailed television images on a large wide screen. In recent years, interest has been increasing in all countries.

This high-definition television broadcast will be broadcast by the Japan Broadcasting Corporation (NHK).
), it has 1125 scanning lines and an aspect ratio of 16:9, compared to the current standard television system which has 525 scanning lines and an aspect ratio of 4:3. In the future, it is thought that high-definition television broadcasting will not suddenly replace the current standard television broadcasting, and that both television broadcasting systems will continue to exist. At this time, even if the high-definition television reception is poor, there is a need to reproduce the image of the current standard television.

FIG. 4 shows a block diagram for displaying current standard television signals on the screen of a high-definition television receiver. The current standard TV signal is input to the input terminal 11m, and the high-definition TV signal is input to the input terminal 2. Enables quality television reception to be received at 1fi4.

The high-definition television receiver 4 is selectively supplied with either the high-definition television broadcast signal at the input terminal 2 or the converted output signal of the scanning line conversion circuit 3 via the switching circuit 5. The receiver 4 is configured to be able to display both high-definition television broadcasts and current television broadcasts.

The problem that the invention seeks to solve Such a conventional configuration has the following problems.

High-definition television signal received by high-definition television receiver 4
When displaying on a high-definition television receiver, there is no problem with missing or surplus image information on the screen because the aspect ratios match; Aspect ratio 16:9 for current standard television broadcast signals
Since the aspect ratio of the current standard television signal is 4:3, when the image is displayed on the screen of the high definition television receiver 4, the vertical v1 of the screen 6 of the current standard television signal is
When displayed according to the vertical v9 of the screen 7.

As shown in FIG. 5(a), no image is displayed in an area 8 indicated by diagonal lines at the edge of the screen 7. If the horizontal H4 of the screen 6 of the current standard TVIL signal is displayed in line with the horizontal H1g of the screen 7 of the high-definition TVIL receiver 4, the current standard TVIL signal will be displayed as shown in Figure 5(b). Information in the vertical direction of the signal is missing as indicated by diagonal lines 9.

The present invention prevents information from being lost due to differences in aspect ratio when displaying images of current standard TV signals on the screen of a high-definition television receiver, and effectively utilizes the entire screen area. The purpose of the present invention is to provide a high-definition television receiver that can perform the following functions.

Means for Solving the Problems The high-definition television temporary reception device of the present invention includes first to sixth field memories that store current standard television signals, and signals from the first to sixth field memories. When reading the first. In the second field memory, the horizontal direction is 1
/! , the vertical direction is severely compressed, and in the 37th and 6th field memories, the horizontal direction is compressed by 1/4. Address generation for controlling the aspect ratio when arranging six images read from the first to sixth field memories on one screen after highly compressing the vertical direction so that it approaches the aspect ratio of a high-definition TV set. a combining circuit that combines the readout outputs of the first to sixth field memories, and a scanning line conversion circuit that converts the number of scanning lines so that the output signal of the combining circuit is compatible with the high-definition TVIL system. The present invention is characterized in that the output of the scanning line conversion circuit is configured to output a video signal television signal to a high-definition television receiver.

According to this configuration, the address generation circuit compresses the screen size of the current standard television signal when reading signals from the first to sixth field memories, so that six screens of the current standard television signal are compressed into one screen. The aspect ratio when arranged on the garden surface is brought closer to the aspect ratio E of the high-definition TV set. Furthermore, since the number of scanning lines is different between the high-definition TV set and the current standard TV set, the scan line conversion circuit processes the output signal of the synthesis circuit to adapt it to the number of scanning lines of the high-definition TV set. The screen of a television receiver displays six screens given by the current standard television signal.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3. Incidentally, components having the same functions as those in FIG. 4 showing the conventional example will be described with the same reference numerals.

FIG. 2 shows a state in which an image given by the current standard TVIL signal is projected on the screen of the high-quality TVIL receiver of the present invention, and 7 indicates that the aspect ratio of the screen is 16=9.
High-definition television receiver screen 4, a to f 6
The two areas represent areas that display images provided by current standard television signals.

FIG. 1 shows a high-definition television receiver according to the present invention.

A current standard TV override signal is sent to the first to sixth field memories M through input terminals 10° to 106.

~MIIl is supplied. A write address 2 and a read address are respectively given from the address generation circuit 11 to the first to sixth field memories M, to M6. Read address is field memo IJM, ~M
The output of 6 is the reproduced image of FIG.
It will be controlled as shown on wf. For example, in order to project on area a in FIG. 2, the following control is performed. When the signal input from the input terminal 10m is output from the first field memory M1, one horizontal scanning period is halved and time compressed to 1/2 in the horizontal direction, and three lines in the vertical direction are outputted from the first field memory M1. One line of (N+3), (N+6), (N+
9) Perform processing to sequentially thin out... The image displayed in the area of FIG. All you have to do is scrape it so that it can be regenerated. Images to areas C-f in FIG. 2 are input to input terminal 10. ~10. The current standard television signal given to the 3rd to 6th field memories M8 to M
6, the compression is controlled so that it is compressed by 1/4 in the horizontal direction and 1/3 in the vertical direction. The first to sixth field memories M, -''-M compressed in the horizontal and vertical directions in this way
The six outputs of , are combined by a combining circuit 12. If this composite signal is played back on the current standard television receiver 4,
Although the image position is as shown in FIG. 2, this signal cannot be reproduced on a high-definition television receiver 4 because the number of scanning lines in one frame is 525. Therefore, in order to convert the number of scanning lines from 525 to 1125, the scanning line conversion circuit 3 performs conversion. Thereafter, the image passes through the switching circuit 5 and is reproduced on the high-definition television receiver 4.

With this configuration, high-definition television reception 11
41. When reproducing video of the current standard television system, the switching circuit 5 supplies the output signal of the scanning line conversion circuit 3 to read out the signals from the first to sixth field memories M, to M6. The images are displayed on the screen 7 all at once. At this time, since each image in areas a to f is compressed in the horizontal and vertical directions, there is no missing image in any of the images as shown in the conventional image shown in FIG. 5(b). As described above, when reading out signals from the first to sixth field memories that store current standard television broadcast signals, the address generation circuit
．． In the second field memory, the horizontal direction is 1/2. The vertical direction is compressed to 1/4, and the horizontal direction is compressed to 1/4 in the third to sixth field memories. The vertical direction is compressed to 1/3 to bring the aspect ratio closer to that of high-definition television broadcasting, and the synthesis circuit synthesizes the read outputs of the first to sixth field memories, and the scanning line conversion circuit converts the output of the synthesis circuit. The number of scanning lines of the output signal is converted to match the high-definition television system, and the output of the scanning line conversion circuit is used to output a video signal to the high-definition television receiver. The image given by the current standard television signal is displayed on the screen of the quality television receiver.
In addition, each image can be displayed without any missing parts, and the display screen of a high-definition television receiver can be effectively utilized.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a high-definition television receiver according to the present invention, Fig. 2 is an explanatory diagram of a display screen when the current standard television signal is reproduced on the same apparatus, and Fig. 3 is a main part of the apparatus. FIG. 4 is a block diagram of a conventional high-definition television receiver, and FIG. 5 is an explanatory diagram of a conventional display state. M, ~M, . . . 1st to 6th field memories, 3.
...Scanning line conversion circuit, 4.High-definition television receiver, 7.Screen of high-definition television receiver, 11.
... Address generation circuit, 12... Synthesis circuit. C Dormitory 3; 31 + J “P” “ゝ” ° - Original Figure 2 1 -

Claims (1)

[Claims] 1. The first to sixth field memories that store current standard television signals, and when reading signals from the first to sixth field memories, the horizontal direction of the first and second field memories is 1/2, The vertical direction is compressed to 2/3, and the 3rd to 6th field memories are compressed to 1/4 in the horizontal direction and 1/3 in the vertical direction. an address generation circuit that controls the aspect ratio when images are arranged on one screen to be close to the aspect ratio of a high-definition television system, and a synthesis circuit that synthesizes the read outputs of the first to sixth field memories; A scanning line conversion circuit that converts the number of scanning lines of the output signal of the combining circuit to conform to a high-definition television system is provided, and a video signal television is provided from the output of the scanning line conversion circuit to a high-definition television receiver. A high-definition television receiver that outputs signals.