JP2578852B2 - High-definition television receiver - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-definition television receiver capable of inputting both an NTSC standard television signal and a high-definition television signal and reproducing an image.

Conventional technology The high-definition television system seeks for new attractiveness such as power and realism that cannot be obtained with the current television system by displaying detailed television images on a large screen. In recent years, interest has been increasing in each country. This high-definition television system is proposed by the Japan Broadcasting Corporation, and the current standard television system has 525 scanning lines and an aspect ratio of 4: 3, whereas 1125 scanning lines and an aspect ratio of 16: 9 It has become. However, it is considered that the high-definition television system will not rapidly replace the current standard television system in the future, and both television systems will continue to exist. Therefore, it is necessary for a high-definition television receiver to receive and reproduce images of the current standard television system.

A possible block diagram for projecting current standard television signals on a high definition television receiver is shown in FIG. The current standard television signal is input to the current standard television signal input terminal 35, and the number of scanning lines is approximately doubled to 525 lines by the signal conversion device 37 so that the high-quality display device 39 can receive an image. And this converted signal and the input terminal
Switching circuit for high-definition television signal input from 36
It is switched by 38 and selected and displayed on the high-quality display device 39.

Problems to be Solved by the Invention When projecting a high-definition television signal on the high-definition display device 39, there is no problem because the aspect ratios match. However, when the current standard television signal that has been scan-converted is projected on the high-definition display device 39, the aspect ratio of the current standard television signal is 4: 3, and thus the high-definition display device having the aspect ratio of 16: 9 is displayed. And are projected as shown in FIGS. 5 (a) and 5 (b). High-quality display 39
FIG. 5 (a) shows a screen when the vertical heights of both of the reproduced images of the current standard television signal scanned and converted are the same, and FIG. 5 (a) shows a screen when the horizontal lengths are the same. FIG. 5 (b). That is, when the current standard television signal that has been scan-converted is projected on the high-definition display device, the image is not projected on the horizontal end of the screen of the high-definition display device as shown in FIG. Or FIG. 5 (b)
As described above, there is a problem that information at both ends in the vertical direction of the image of the current standard television signal is lost.

In view of the above problems, the present invention, when projecting the current standard television signal on a high-definition display device, without causing information loss at both ends of the screen in the vertical direction due to the difference in aspect ratio, the horizontal edge of the screen It is an object of the present invention to provide a high-definition television receiving apparatus that can effectively utilize a portion where a video is not displayed and that has a good reproduced image.

Means for Solving the Problems A high-definition television receiver according to the present invention for solving the above-mentioned problems is time-compressed in the horizontal and vertical directions by using field memories respectively corresponding to nine current standard television signals. The time-compressed current standard television signal is displayed on a display screen of a high-definition television.

Effect of the Invention With the above-described configuration, when projecting an image of a current standard television signal having a different aspect ratio from a high-definition television signal to a high-definition television receiver, the screen size of the nine current standard television signal images is reduced. By displaying nine images on the entire display screen, the screen can be effectively used without waste.

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

In FIG. 1, reference numeral 1 denotes a screen display unit of a high-definition television receiver having a screen aspect ratio of 9:16, and reference numerals 2 to 10 denote display areas on the screen display unit 1 for displaying current television signals. .

FIG. 2 is a block diagram showing a configuration of a high definition television receiver according to one embodiment of the present invention. In FIG. 2, reference numerals 11 to 19 denote input terminals for the current NTSC standard television signal, reference numeral 20 denotes an input terminal for a high-definition television signal, reference numerals 21 to 29 denote field memories, reference numeral 30 denotes an address generation circuit of field memories 21 to 29, and reference numeral 31. Is a synthesizing circuit for synthesizing the output signals of the field memories 21 to 29, 32 is a scanning line converting circuit for doubling the scanning lines of the output signals of the synthesizing circuit 31, and 33 is a scanning line converting circuit.
A switching circuit for switching and outputting the output signal of 32 and the high-definition television signal applied to the input terminal 20; 34 is a switching circuit 33
Is a high-definition television display device that projects the output signal of the television set.

The operation of the high-definition television receiver configured as described above will be described below with reference to FIGS.

The current standard television signal is added to the input terminals 11 to 19,
Input to the field memories 21 to 29. Field memory
A write address and a read address are supplied from 21 to 29 from the address generation circuit 30, respectively.

The read address is controlled so that the outputs of the field memories 21 to 29 are projected on the reproduced image of FIG. 1, that is, the display areas 2 to 10, respectively.

For example, the following control is performed to project the area 4 in FIG. First, the signal input from the input terminal 11 is controlled so as to perform time compression in the horizontal direction at the time of output from the field memory 21, and to perform processing to thin out one of three lines in the vertical direction. In addition, reading from the memory 21 is shifted by 1/4 of the horizontal scanning period so that the image is displayed at the center of the screen.

This is shown in more detail in FIG. The signal applied to the input terminal 11 by the time compression control described above
The reproduced image is compressed by 1/2 and 2/3 in the vertical direction.

Further, in order to project the image on the display areas 2, 3, 5 to 10 in FIG. 1, the current television signal applied to the input terminals 12 to 19 is horizontally divided by 1/4 in the field memories 22 to 29. , And control to compress by 1/3 in the vertical direction.

The nine outputs of the field memories 21 to 29 compressed in the horizontal and vertical directions in this way are synthesized by the synthesizing circuit 31. If this synthesized signal is reproduced on the current television receiver,
Although the image position is as shown in FIG. 1, this signal cannot be reproduced by a high-definition television receiver because the number of scanning lines in one frame is 525. Therefore, conversion is performed by the scanning line conversion circuit 32 in order to reduce the number of scanning lines from 525 to 1125. Thereafter, the image passes through the switching circuit 33 and is reproduced on the display device.
The switching circuit 33 switches between a signal obtained by scanning line conversion of the synthesized current television signal output from the synthesis circuit 31 by the scanning line conversion circuit 32 and a high-definition television signal applied to the input terminal 20 for output. Is what you do.

As described above, according to the present embodiment, the field memories 21 to 29 for storing each current television signal in the high-definition television receiver and the outputs of the field memories 21 to 29 are time-compressed in the horizontal and vertical directions. An address generating circuit 30 for synthesizing the data, a synthesizing circuit 31 for synthesizing the outputs of the field memories 21 to 29, and a scanning line for converting the scanning line so that the current television signal can be displayed on a display device of a high-definition television. By providing a conversion circuit 32 and a switching circuit 33 for switching and outputting a signal obtained by scanning line conversion of a current television signal and a high-definition television signal, when projecting the current television signal to a high-definition television receiver, It is possible to effectively use the display screen of the high-definition television receiving device without losing the information and without causing a non-display portion.

In this embodiment, the number of screen divisions is nine, and the way of dividing the screen is as shown in FIG. 1. However, it goes without saying that the present invention is not limited to this embodiment.

As described above, according to the present invention, when projecting a plurality of current standard television signals to a high-definition television receiver,
Without dropping the video signal, it can be displayed on the full display screen, can effectively use the display screen of the high-definition television receiver, without giving the viewer discomfort due to the lack of screen, It can support both high-definition television signals and standard television signals.

[Brief description of the drawings]

FIG. 1 is a front view showing a display state of a high-definition television receiver according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the same, and FIG. FIG. 4 is a block diagram of a conventional high-definition television receiver, and FIGS. 5a and 5b are diagrams showing display states of a conventional example. 1 high-definition television receiver, 2 to 10 current television signal projection unit, 21 to 29 field memory,
30: an address generation circuit, 31: a synthesis circuit, 32: a scanning line conversion circuit, 33: a switching circuit, 34: a display device.

Claims (1)

(57) [Claims] 1. A high-definition television signal input terminal, nine standard television signal input terminals, nine standard television signal input terminals, and a one-to-one correspondence with each of the nine standard television signal input terminals. Nine field memories, an address generation circuit for performing time compression control of a signal input to the field memory, a synthesis circuit for synthesizing output signals of the nine field memories, A scanning line conversion circuit for converting an output signal into a scanning line; a switching circuit for selectively switching an output signal of the scanning line conversion circuit and the input high-definition television signal input signal; and displaying an output signal of the switching circuit. A display device, and when projecting a plurality of current standard television signals on a display screen of the display device, the display screen is full without dropping the video signal. High definition television receiver, characterized in that as synthesized by the combining circuit so as to be displayed.