JPH01157181A - High definition television receiver - Google Patents

Abstract

PURPOSE:To prevent a video signal to be lacked and to effectively utilize a display screen by time base-compressing the picture size of plural input present standard television signals to a prescribed rate, synthesizing the signals and projecting them after scanning line conversion. CONSTITUTION:The present standard television signal is added to input terminals 14-25 and respectively inputted to field memories 27-38. A writing address and a reading address are given from an address generating circuit 39 to the field memories 27-38. At the output time of the field memories 27-38, the television signals to be inputted to the input terminals 14-25 go to be reproducing signals, which are time base-compressed to 1/4 in a horizontal direction and to 1/3 in a vertical direction and the signals are synthesized by a synthesizing circuit 40. Then, after the number of scanning lines are converted by a scanning line converting circuit 41, the signals are projected through a switching circuit 42 to a display device 43 without being lacked and generating a non-display part.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a high-definition television receiving apparatus that can input a current standard television signal and a high-definition television signal and display both television signals.

Conventional technology High-definition television systems aim to display detailed television images on large screens, seeking new appeal such as power and realism that cannot be obtained with current television broadcasting. In recent years, interest has been increasing in all countries. This high-definition television viewing system was proposed by the Japan Broadcasting Corporation, and while the current standard television system has 526 scanning lines and an aspect ratio of 4:3.
It has 1125 scanning lines and an aspect ratio of 16:9. However, high-definition television signals will not suddenly replace the current standard television system in the future;
It is thought that both television systems will continue to exist.

Therefore, even high-definition television receivers need to receive and reproduce images of the current standard television system.

FIG. 4 shows a block diagram conceivable for displaying current standard television signals on a high-definition television receiver. The current standard television signal is input to the current standard television signal input terminal 44, and the signal converter 46 approximately doubles the number of scanning lines (525) to create a high-definition television display device 4.
Make it possible to receive images at 8. The converted signal and the high-definition television signal input through the input terminal 46 are switched by the switching circuit 47 and displayed on the high-definition television display device 48.

Problems to be Solved by the Invention When a high-definition television signal is displayed on the high-definition television display device 48, there is no problem because the aspect ratios match. However, when the current standard television signal that has been scan-converted is displayed on the high-definition television display device 48,
Since the aspect ratio of the current standard television signal is 4=3, it does not match with the high-definition television display device 48 with an aspect ratio of 16:9, and is displayed as shown in FIGS. 5(a) and 5(b). . The screen when the vertical height of both the high-definition television display device 48 and the playback image of the scan-converted current standard television signal is made the same (see Figure 6), and when the horizontal length is made the same The screen is shown in FIG. 5(b). When a scan-converted current standard television signal is displayed on a high-definition television display device, the image is not displayed at the horizontal edge of the screen of the high-definition television display device, as shown in Figure 5). Otherwise, as shown in FIG. 5(b), information at both vertical ends of the image of the current standard television signal is missing.

In view of the above-mentioned problems, the present invention has been made to improve the horizontal direction of the screen without causing loss of information at both vertical ends of the screen due to differences in aspect ratio when displaying current standard television signals on a high-definition television display device. It is an object of the present invention to provide a high-definition television receiving device with good reproduced images that effectively utilizes the portions of the edge images that are not displayed.

Means for Solving the Problems In order to solve the above problems, the high-definition television receiver of the present invention has a plurality of current standard television signal input terminals and connections to these input terminals in correspondence with each other. an address generation circuit that compresses the time axis of the television signal input to the field memory in the horizontal and vertical directions, a synthesis circuit that synthesizes multiple time axis compressed signals, and a scanning line conversion circuit. The present invention is characterized by comprising: a switching circuit for switching and outputting the output of the scanning line conversion circuit and a high-definition television signal; and a high-definition television display device.

Effect With the above configuration, when displaying a current standard television signal with a different aspect ratio from the high-definition television signal on a high-definition television display device, the screen size of multiple input current standard television signals is compressed, and the high-definition television signal is displayed. A television display device allows a plurality of images to be projected on a cup, allowing effective use of the screen.

Embodiment Hereinafter, a high-definition television receiver according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a current standard television signal displayed on a high-definition television display device according to an embodiment of the present invention.

In FIG. 1, 1 is a screen display section of a high-quality television display device with an aspect ratio of 16:9, and 2 to 13 are current standard television signal projection sections.

FIG. 2 is a block diagram of a high-definition television receiver according to an embodiment of the present invention.

In FIG. 2, 14-26 are current standard television signal input terminals, 26 is a high-definition television signal input terminal,
27 to 38 are field memories, 39 is an address generation circuit for the field memories 27 to 38, 40 is a synthesis circuit that synthesizes the output signals of the field memories 27 to 38, and 41 is a scanning line that converts the output of the synthesis circuit 4° into a scanning line. conversion circuit,
42 is a switching circuit that switches and outputs the output signal of the scanning line conversion circuit 41 and the high-definition television signal applied to the input terminal 26; 43 is a high-definition television display device that displays the output of the switching circuit 42;

The operation of the high-definition television receiving apparatus configured as described above will be explained below with reference to FIGS. 1, 2, and 3.

Current standard television signals are applied to input terminals 14-25 and input into field memories 27-38, respectively. A write address and a read address are given to the quill memories 27 to 38 from an address generation circuit 39, respectively. The write address and read address are output from the field memories 27 to 38 to the projection units 2 to 13 in FIG.
It is controlled so that it is displayed in the area of the image.

For example, the following control is performed to display images on the projection section 2 in FIG. That is, when the television signal input to the input terminal 14 is output from the field memory 27, the time axis is compressed in the horizontal direction to K, and the time axis is compressed in the vertical direction by decimating 2 out of 3 lines by %. controlled as follows. This situation is shown in FIG. With this control, the signals applied to the input terminals 14 to 26 are 1/4 in the horizontal direction.
, the reproduction signal is compressed in the Z time axis in the vertical direction.

The output signals of these field memories 27 to 38 are combined by a combining circuit 40. If this composite signal is configured on a current standard television display device, the image position will be as shown in Figure 1, but this signal has 625 scanning lines per frame.
Since it is a book, it cannot be played on the high-definition television display device 43.

Therefore, the scanning line conversion circuit 41 performs conversion to reduce the number of scanning lines from 525 to 1125. After that, the switching circuit 42
The image is then played back on the high-definition television display device 43. The switching circuit 42 switches between and outputs a scan-converted signal of the synthesized current standard television signal output from the synthesizing circuit 4° and a high-definition television signal applied to the input terminal 26.

As described above, according to this embodiment, the high-definition television display device 43 includes the field memories 27 to 38 that store the current standard television signals, and the field memories 27 to 38 that store the current standard television signals.
An address generation circuit 39 for horizontally and vertically compressing the outputs of 38 and each field memory 27 to 3.
8, a scanning line conversion circuit 41 that converts the scanning line so that the current standard television signal can be displayed on a high-definition television display device, and By providing the switching circuit 42 that switches and outputs the high-definition television signal, when displaying the current standard television signal on the high-definition television display device 43, the information will not be lost and the non-displayed portion will be eliminated. The display screen of the high-definition television display device 43 can be used effectively without causing any problems.

Effects of the Invention As described above, according to the present invention, when displaying a plurality of current standard television signals on a high-definition television display device,
The video signal can be displayed on the display screen without being dropped, and the display screen of the high-definition television display device can be used effectively.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the display state of a high-definition television receiver according to an embodiment of the present invention, FIG. 2 is a block diagram of the same device, and FIG. 3 is a control for displaying a plurality of current television signals. An explanatory diagram of the method, FIG. 4 is a block diagram of a conventional high-definition television receiver, and FIGS. 6 a and 6 b are diagrams showing display states in the conventional case. 1...High-definition TV Shiron receiving device, 2-13
. . . Projection section, 27-38 . . . Field memory, 39 . . . Address generation circuit, 40.
... Synthesis circuit, 41 ... Scanning line conversion circuit, 42 ... Switching circuit, 43 ... High-definition television display device. Name of agent: Patent attorney Toshio Nakao and 1 other person l4
~8-Human Power Section Figure 4

Claims (2)

[Claims] (1) High-definition television signal input terminal and multiple N
a TSC standard television signal input terminal, a field memory connected one-to-one to each of the plurality of standard television signal input terminals, and an address generation circuit that performs time compression control of the signal input to the field memory; an image reproducing circuit that synthesizes time-compressed standard television signals and performs scan line conversion, and displays the plurality of time-compressed and scan line converted standard television signals on a display device that displays the high-definition television signal. A high-definition television receiving device characterized in that the high-definition television signal is switched to the high-definition television signal and reproduced and displayed. (2) To input a high-definition television signal and a current standard television signal with a different aspect ratio, and compress the time axis of the current standard television signal to 1/4 in the horizontal direction and 1/3 in the vertical direction, respectively. 12 field memories, an address generator for controlling the field memories, a combining circuit for combining the output signals of the field memories, a scanning line conversion circuit for converting the output signals of the combining circuit into scanning lines, and the a switching circuit that switches and outputs the output signal of the scanning line conversion circuit and the high-definition television signal;
The high-definition television receiving device according to claim 1, comprising a high-definition television display device that displays the output signal of the switching circuit.