JPH01157182A - High-fidelity television receiver - Google Patents

Abstract

PURPOSE:To prevent a video signal to be lacked and to effectively utilize a display screen by scan converting a standard television signal, projecting it in the center of the screen, and projecting the plural standard television signals on the both edges of the screen with being time base-compressed and scan- converted. CONSTITUTION:The standard television signal, which is added to an input terminal 201 and projected on a screen center 102, is compression-processed to a horizontal 31.5KHz or 33.75KHz by a scan-converting circuit 216 and the scan- conversion is executed to the signal. Next, the standard television signal, which is added to input terminals 202-213 and projected in compression projecting parts 103-104 in the both edges of the screen, is inputted to a memory and memory control circuit 215, time base-compressed respectively to 1/6 in horizontal and vertical directions and scan-converted by a scan-converting circuit 220. The scan-converted signals, which are the output of the scan-converting circuit 216 and the output of the memory and memory control circuit 215, are synthesized by a synthesizing circuit 217 and projected through a switching circuit 218 to a display device 219 without being lacked and generating a non-display part.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high-definition television receiving apparatus used in a high-definition television system having a different aspect ratio from the NTSC standard television system.

Conventional high-definition television technology displays detailed television images on a large screen! The aim is to seek out new appeals such as power and realism that cannot be obtained with current television broadcasting, and interest has been increasing in recent years in various countries. This high-definition television system was proposed by the Japan Broadcasting Corporation, and has 1125 scanning lines and an aspect ratio of 16:9, compared to the current standard television system which has 626 scanning lines and an aspect ratio of 4:3. It is. However, high-definition television systems will not suddenly replace the current standard television systems in the future;
It is thought that both television systems will continue to exist.

At this time, it becomes necessary for high-definition television receivers to receive and reproduce images of the current standard television system.

FIG. 3 shows a block diagram that can be considered when displaying current standard television signals on a high-definition television receiver. A current standard television signal is input to a current standard television signal input terminal 41, and a signal converter 43 approximately doubles the number of scanning lines to 526 so that it can be received by a high-definition television receiver 46. The converted signal and the high-definition television system signal input through the input terminal 42 are switched to the switching circuit 44 and displayed on the high-definition television receiver 45.

Problems to be Solved by the Invention When displaying a high-definition TV or digon signal on the high-definition TV receiver 45, since the aspect ratios match, there is no problem in that image information on the screen is missing or redundant. There isn't. However, when displaying the scan-converted current standard television signal on the high-definition television receiver 46, since the aspect ratio of the current standard television signal is 4:3, the high-definition television with an aspect ratio of 16:9 is displayed. It is not matched with the receiver and is displayed as shown in Fig. 4(a), Φ).

Figure 4 (2L) shows the screen when the vertical heights of both the high-definition television receiver 46 and the scan-converted current standard television signal playback image are the same, and the horizontal lengths are the same. The screen will be displayed as shown in Figure 4). In other words, when an image of the current standard television signal that has been scan-converted is displayed on a high-definition television receiver, the image will not be displayed at the horizontal edge of the screen of the high-definition television receiver, as shown in Figure 4 (&). However, there are problems in that the information at both vertical ends of the image of the current standard television signal is missing, as shown in FIG. 4(b).

In view of the above-mentioned problems, the present invention aims to effectively utilize one screen when displaying images of current standard television signals on a high-definition television receiver without causing information loss and sound due to differences in aspect ratio. It is.

Means for Solving the Problems In order to solve the above problems, the high-definition television receiving device of the present invention scan-converts and displays the current television signal in the center of the screen, and the images at both ends are not displayed using this signal. This system scan-converts the other 12 standard television signals and compresses the time in the vertical and horizontal directions using memory, and displays the 13 standard television signals on a high-definition television display device. It is characterized by being projected on the entire surface of the screen.

Effect With the above configuration, when displaying a current standard television signal with a different aspect ratio from a high-definition television signal on a high-definition television receiver, the image of the current standard television signal is displayed in the center of the screen after full scanning conversion. , at both ends,
12 current standard television signals are time-compressed vertically and horizontally using memory and scan converted to display on the display screen.
Thirteen images can be projected on the cup, making effective use of the screen.

Embodiment Hereinafter, a high-definition television receiving apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a current television signal displayed on the screen of a high-definition television receiver according to an embodiment of the present invention.

In FIG. 1, 101 is a screen display section of a high-definition television receiving device whose screen aspect ratio is 16=9;
114 is a projection section that displays all current television signals.

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

201 to 213 are input terminals for current NTSC standard television signals, 214 is an input terminal for high-definition television signals, 215 is a memory and a memory control circuit, and 216 is a scanning device that performs scan conversion on the signal input from the input terminal 201. conversion circuit, 217 is memory and memory control circuit 21
a synthesis circuit 218 for synthesizing the signal whose output is scan-converted by the scan conversion circuit 220 and the output signal of the scan conversion circuit 216;
219 has a screen with an aspect ratio of 16:9 on which the output signal of the switching circuit 218 is displayed. It is a display device.

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

For example, if you have two tuners, one always applies the current standard television signal whose tuner output is displayed in the center of the screen to the input terminal 201, and the other one receives 12 current standard television signals that are displayed at both ends of the screen. Input terminals 202 to 213 for switching channels using two tuners, switching for reception, etc.
Add to. The scan conversion circuit 216 converts the signal displayed at the center of the screen to a horizontal frequency of 31.6 KHz or 3□3.7tsK.
Compression processing is performed to Hz (horizontal frequency of high-definition television) and scan conversion is performed. Next, the signals to be displayed at both ends of the screen are input to the memory and memory control circuit 215, and the 12 signals are compressed and converted into % in the horizontal direction, compressed and converted into % in the vertical direction, and read out. These time-base compressed signals are scan-converted by a scan conversion circuit 220. and,
A synthesis circuit 217 synthesizes the output of the aforementioned scan conversion circuit 216 and the scan-converted signal output from the memory and memory control circuit 216 as shown in FIG. Next, synthesis circuit 2
The composite current television signal which is the output of 17 and the terminal 21
The switching circuit 2 switches the high-definition television signal input from 4 to the switching circuit 2.
18 and displayed on the display device 219.

As described above, according to this embodiment, the high-definition television receiving device stores current television signals, and includes a memory and memory control circuit 215 that compresses and converts them, a scan conversion circuit 216 that performs scan conversion, and a memory that stores current television signals and converts these signals. By providing a combining circuit 217 for combining the high-definition television signal and a switching circuit 218 for switching the current television signal combined with the high-definition television signal, when displaying the current television signal on a high-definition television receiver, the information can be To effectively utilize the display screen of a high-definition television receiving device without missing any video and without any portions where no video is displayed.

Effects of the Invention As described above, according to the present invention, when displaying a plurality of current television signals on a high-definition television receiving device, the video signals can be displayed on the entire display screen without being dropped. This allows effective use of the display screen of the high-definition television receiver.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a display state of a high-definition television receiver in an embodiment of the present invention, FIG. 2 is a schematic block diagram of a high-definition television receiver in an embodiment of the present invention, and FIG. 3 is a diagram showing a display state of a high-definition television receiver in an embodiment of the present invention. A schematic block diagram of a conventional high-definition television receiving device, and FIGS. 4(a) and 4(b) are diagrams showing display states of a conventional high-definition television. 101... High-definition television Receiving device, 10
2... Current television projection department, 103-11
4...Current television compression projection department, 2o1.
...Current television signal input terminal, 202-2
13... Current television signal input terminal, 21
4...High-definition television signal input terminal, 21
6...Memory and memory control circuit, 216...
...Scan conversion circuit, 217...Synthesizing circuit,
218...Switching circuit, 219...Display device, 220...Scan conversion circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person10
1-11 High-quality paper 102--Rimitsuke 103-I/4
--- Dante L1 Gon°yon, Jiang' Shikikyo Part 7 Figure 1

Claims (1)

[Claims] A first scan conversion circuit that scan-converts a first input standard television signal having a different aspect ratio from a high-definition television signal, and stores 12 input standard television signals other than the first input standard television signal. a signal processing section comprising 12 memories for time compression conversion, a memory control circuit for controlling drive of these memories, and a second scan conversion circuit for scan converting the 12 input standard television signals; It is equipped with a synthesis circuit that synthesizes the output of the scan conversion circuit and the output of the signal processing section, and a switching circuit that switches and outputs the output of this synthesis circuit and the input high-definition television signal. A high-definition television receiving device characterized by displaying images on the entire screen of a display device.