JPH02215293A - High grade television display device - Google Patents

Abstract

PURPOSE:To effectively make the most of a display surface to a high-grade TV broadcasting, a standard TV broadcasting and, further, a cinemascope size broadcasting by providing a time compressing circuit, a deflecting circuit in which a deflecting frequency is charged with a switch operation, and a switching circuit. CONSTITUTION:A standard TV interlace signal a2 is inputted to a signal converting circuit 1 and outputted as a standard TV noninterlace signal a3. A signal detecting circuit 8 detects whether the input signal is an ordinary video or the video in the cinemascope size with a switching control signal 10, and in the case of the ordinary video, a time compressing circuit output a4 is selected by a switching circuit 4, and in the case of the video in the cinemascope size, a signal converting circuit output a3 is selected by the switching circuit 4. A synchronizing.deflecting circuit 7 decides whether an input synchronizing signal a0 is the synchronizing signal of the high-grade TV or the synchronizing signal of the standard TV, and a switching control signal a8 is inputted to a switching circuit 5. The signal converting circuit output a3 or high-grade TV signal a1 is selected, and further, a corresponding deflection processing is executed by a synchronizing signal a9.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a high-definition television display device capable of displaying standard television, non-interlaced signals.

BACKGROUND OF THE INVENTION In recent years, with the development of the so-called MUSE system, the appearance of high-definition television as the next generation of television is taking shape. Among these, a system has been devised that attempts to display conventional standard television signals on the display gray of high-definition television.

As a conventional technique, for example, as shown in Japanese Unexamined Patent Publication No. 62-263783, a high-definition television signal, a standard television signal, and an external signal are used as input signals,
When a standard television signal is output to a high-definition television display device, an external signal may be output to a portion of the signal that is missing due to the aspect ratio.

Problems to be Solved by the Invention However, with the above configuration, if the standard television signal is an image with the top and bottom cut off, such as CinemaScope size, the output screen will be as shown in Figure 4, and the size of the display screen will change. This has the problem of not being able to make the most of it.

The present invention has been developed in view of the above problems, and when outputting a standard television signal video to a high-definition television output device, even if the signal is a standard signal, the top and bottom are cut off like the cinema scope size video mentioned above. It is an object of the present invention to provide a high-quality television display device that can display images with a good screen size even when signals are used.

Means for Solving the Problems To achieve this object, the high-definition television display device of the present invention includes a signal conversion circuit for converting a standard television interlaced signal into a standard television non-interlaced signal, a standard television non-interlaced signal. A time compression circuit that temporally reduces the incremental signal; an output control circuit that controls the output period of the time-compressed signal; and an output control circuit that outputs a switching control signal according to the video signal characteristics of the input standard television incremental signal. a signal detection circuit; a switching circuit that receives a time-compressed standard television non-interlaced signal and a non-time-compressed standard television non-interlaced signal; and switches an output signal according to a switching control signal from the signal detection circuit; the switching circuit; A switching circuit that receives an output and a switching control signal for switching between a high-definition television signal and a standard television signal depending on the characteristics of the high-definition television signal and the input synchronization signal, and switches the output signal according to the switching control signal, a high-definition television signal. It consists of a synchronization and deflection circuit and a high-definition television output device that performs different synchronization and deflection during output and standard television signal output, and even for standard television signals, depending on the characteristics of the signal.

Effect: With this configuration, when outputting a standard television signal with a different aspect ratio from a high-definition television signal to a high-definition television output device, the magnitude of deflection and signal time will vary depending on whether the signal is CinemaScope size or not. By performing compression, a good-sized output screen can be obtained.

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

FIG. 1 is a block diagram showing the configuration of a high-definition television display device according to an embodiment of the present invention.

In FIG. 1, 1 is a signal conversion circuit, 2 is a time compression circuit, 3 is an output control circuit, 4 is a switching circuit, 6 is a switching circuit, 6
is a high-definition television output device, 7 is a synchronization and deflection circuit,
8 is a signal detection circuit.

The operation of the high-definition television display device configured as described above will be described below.

The standard television interlace signal flLz, which has been converted into digital data and turned into a component signal, is input to the signal conversion circuit 1, where it is converted into 626 (1:1) standard television non-interlace signals! It is output as L3.

The standard television non-interlaced signal [-&, is input to the time compression circuit 2 and is the signal a4 compressed in time to %.
is output as

Note that the period during which the time compression signal a4 is output is controlled by the output control signal IL6 which is the output of the output control/control circuit 3. In this embodiment, when the output control signal a6 is "'L", the signal a4 is enabled to be output, and when it is "H", it is disabled.

Signal conversion circuit output signal a3 and time compression circuit output signal a
4 is input to the switching circuit 4 as switching control signals a,. One of them is selected based on the knowledge and becomes the output signal a5.

When the standard television interlaced signal tL2 of the input signal is a normal video and the signal conversion circuit output signal &3 is selected, the video signal becomes the output screen 22 (see Figure 3), but due to the difference in aspect ratio, If the horizontal screen size is adapted to that of a high-definition television system, the input video signal a2 will be cut off at the top and bottom because it is actually only the size of the output screen 20.

On the other hand, if the time compression circuit output signal a4 is selected,
The video signal is output to the output screen 21.

Here, the output screen 21 is on the left side, but it can be displayed at any location during the horizontal scanning period by changing the output control signal a6.

Next, the input signal standard television interlaced signal a
2 is a cinemascope size video as shown in FIG. 4, and when the time compression circuit output signal a4 is selected, the video is very small for the high-definition television screen as shown in FIG. It becomes a video. That is, when the standard television incline signal IL2 as the input signal is a cinemascope size video, the effective screen range becomes wider when the signal conversion circuit output signal a3 is selected in the switching circuit 4.

Therefore, in the present invention, in order to eliminate the above-mentioned drawbacks, the signal detection circuit 8 detects whether the input signal, the standard television interlace signal &2, is a normal video or a cinemascope size video, and switches the input signal. Control signal a. Therefore, when the standard television interlaced signal IL2 is a normal video, the switching circuit 4 outputs the time compression circuit output a.
Select 4.

In the case of cinemascope size video, the switching circuit 4 selects the signal conversion circuit output a5.

In the case of CinemaScope size video, the video signals before and after the vertical sync signal are almost black level, so by detecting the level of the video signal for a certain period around the vertical sync signal, it is possible to It is possible to detect whether it is present or not. The synchronization and deflection circuit 7 receives an input video signal. It is determined whether the signal is a high-definition television synchronization signal or a standard television control synchronization signal, and the determination result is input to the switching circuit 6 as a switching control signal &8. The switching circuit 6 further receives the output &5 of the switching circuit 4 and the high-definition television signal &.

is input, and one side becomes the output signal by the switching control signal &8.
It becomes N.

Note that the synchronization and deflection circuit 7 outputs the output from the switching circuit 4 &5.
input synchronization signal a so that the synchronization signal and the synchronization signal match. is a high-definition television, it outputs 1125 (2:1) synchronization signals a9 to the output devices, while the input synchronization signal a.

When is a standard television, 626 (1:1) synchronizing signals a are output to the output device 6. synchronous signal LL,
It outputs 626 lines (1:1) as a switching control signal a, and outputs 626 lines (1:1). When the output a5 of the switching circuit 4 is selected as the signal a, the vertical deflection amplitude is changed to the signal peak in order to output the upper and lower video signals to the outside of the screen. is larger than when it was selected.

As described above, the video output 'H' and the synchronization signal a9 are input to the high-definition television output device, and the video is displayed.

Effects of the Invention As described above, the present invention provides a time compression circuit, a deflection circuit whose υ deflection frequency is changed by switch operation, and a switching circuit when displaying a television signal on a high-definition television display device. The display surface can be effectively utilized for television broadcasting, standard television broadcasting, and even cinemascope size broadcasting, and the practical effect is great.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a high-definition television display device according to an embodiment of the present invention, FIG. 2 is a waveform diagram for explaining the operation of the high-definition television display device of FIG. 1, and FIG. FIG. 4 is a diagram showing an example of a conventional display screen. DESCRIPTION OF SYMBOLS 1... Signal conversion circuit, 2... Time compression circuit, 3... Output control circuit, 4... Switching circuit, 5...... Switching circuit, 6... High quality television output device, 7... Synchronization, deflection circuit, 8... Signal detection circuit.

Claims (1)

[Claims] A signal conversion circuit that takes a standard television interlaced signal as input and outputs a standard television non-interlaced signal; a time compression circuit that takes the output of the signal conversion circuit as input and compresses the signal on the time axis; and an output of the time-compressed signal. an output control circuit that controls timing; and an output control circuit that receives the standard television interlaced signal as input, and outputs a first switching control signal depending on whether or not the video signal of the standard television interlaced signal is a cinemascope size signal. A signal detection circuit to output, a first switching circuit which receives the signal conversion circuit output and the time compression circuit output as input and selects an output signal by a first switching control signal, and a synchronization signal which is input and which controls synchronization and deflection. a synchronous deflection circuit that outputs a second switching control signal according to a signal and an input synchronous signal; a high-definition television interlaced signal; the first switching circuit output signal; and the second switching control signal. a high-definition television output device that receives the second switching circuit output signal and the synchronization and deflection control signals as input; A high-definition television display device comprising: