JPH02214387A - High definition television receiver - Google Patents

Abstract

PURPOSE:To output a cinemascope signal on the entire high definition television output pattern by using a level detection circuit, a counter circuit and a detection circuit so as to detect a cinema scope signal thereby varying the intermediate processing and a vertical scanning signal. CONSTITUTION:When the input existing NTSC signal is a cinema scope, since no signal period continues after the vertical synchronizing pulse, the count of a counter circuit 22 is increased for each one horizontal scanning period. The value counted by the counter circuit 22 is outputted to a detection circuit 23 and a synchronizing deflection circuit 10 as a count signal a14. The detection circuit 23 compares the count signal a14 with a predetermined value and when the count signal a14 is over the value above, '1' is outputted and in the other case, '0' is outputted as a switching signal a15. The synchronizing deflection circuit 16 controls the vertical scanning signal depending on the count signal a14. Thus, even when no signal period of an input signal a1 is changed, the picture is always displayed on the entire screen.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to cinemascope size NTSC (Natio
nal Te1evision System Com
The present invention relates to a high-definition television receiver for automatically outputting an image of a m1ttee) signal over the entire screen of a high-definition display.

BACKGROUND OF THE INVENTION In recent years, the appearance of high-definition television as the next generation of television has become more concrete. Among these, devices have been proposed that attempt to display conventional NTSC signals on high-definition television displays by adding some processing.

Conventionally, as this type of technology, for example, Japanese Patent Application Laid-Open No. 62-26
As described in Publication No. 3783, it has a high-definition television signal, a current NT53G television signal, and an external signal as input signals, and arranges the current NTSC signal and external signal on the same screen as a main screen and a sub screen. , which take full advantage of the screen size of high-definition television.

FIG. 6 shows a display state of a conventional high-definition television receiver. In FIG. 6, 61 is a high-definition television output screen, 62 is a current television output screen, and 63 is a high-definition television output screen.
64 is an external signal output screen, and 64 is a current television output screen for cinemascope signals. As is clear from FIG. 6, the current NTSC television signal output screen 62 and the external signal output screen 63 can both be placed on the same screen within the high definition television output screen 61.

FIG. 6 is a block diagram of a conventional high-definition television receiver. In FIG. 6, 1o is a signal conversion circuit, 11
12 is a composite image creation circuit, 12 is a switching circuit, and 13 is a high-definition television output device.Fourth, the operation of the above-mentioned conventional high-definition television receiving device will be explained. In FIG. 6, an NTSC signal a signal color 1 part input signal a2 is input to a signal conversion circuit 1o, and scan conversion processing is performed depending on which input is to be displayed as a main screen or a sub screen.

Signal reduction processing is performed, and the main screen a 4 is output as a child screen a5, which is input to the composite image creation circuit 11 and output as a composite image output a6. The switching circuit 12 receives the composite image output a and the high-definition television signal a3 as input, and switches between them to produce an output signal a7. The high-definition television output device 13 inputs the signal a7 and finally outputs it as an image.
As a result, a display is displayed corresponding to the input signal as shown in FIG.

Problems to be Solved by the Invention However, in the conventional method described above, when the NTSC signal is of cinemascope size, the size is small because the NTSC signal is displayed on a high-definition television CRT, as is clear from Fig. 6. The screen becomes even smaller and the characteristics of a large screen are no longer displayed.

The present invention solves the above-mentioned conventional problems, and is a cinemascope-sized NT! When 3C signal is input,
The object of the present invention is to provide a high-definition television receiver that has a signal detection circuit that automatically detects the signal and can automatically display an image on the entire cathode ray tube screen for high-definition television. .

Means for Solving the Problems In order to achieve the above object, the present invention includes a signal detection circuit that determines the nature of an NTSC signal, and a signal detection circuit that detects different synchronization deflection signals depending on the nature of the NTSC signal, whether or not it is a cinemascope signal. The generated synchronous deflection circuit, a signal conversion circuit, a composite image creation circuit, a switching circuit that uses the input signal and output signal of the composite image creation circuit as input signals and switches the output signal, and a signal conversion circuit that converts the input signal and output signal into a high-definition television signal. The switching circuit is equipped with a switching circuit that receives an NTSC signal as input and switches the output signal.

Operation The present invention has the above-described configuration, and when a normal NTSC signal is input, the NTSC signal passes through a signal conversion circuit and a composite image creation circuit and outputs a parent image and a child image. When a scope signal is input, the NTSC signal has the effect of passing only through the signal conversion circuit and outputting the image to the entire cathode ray tube according to the output of the signal detection circuit.

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 block diagram showing the configuration of a high-definition television receiver according to an embodiment of the present invention. In FIG. 1, 10 is a signal conversion circuit, 11 is a composite image creation circuit, 12 and 16 are switching circuits, 13 is a high-definition television output device, 14 is a signal detection circuit, and 16 is a synchronous deflection circuit. The present invention has its features in the signal detection circuit 14 and the synchronous deflection circuit 16.

FIG. 2 is a block diagram of a signal detection circuit in one embodiment of the present invention. In FIG. 2, 21 is a level detection circuit, 22 is a counter circuit, and 23 is a detection circuit. FIG. 3 is a diagram showing the positional relationship of various signals, and FIG. 4 shows a vertical scanning signal for outputting a scanning conversion signal made from a normal NTSC signal and a cinemascope signal.

Next, the operation of the high quality television receiver of this embodiment will be explained with reference to FIGS. 1 to 4. The synchronously separated NTSC signal a signal a1□ is input to the signal detection circuit 14. The signal detection circuit 14 has the configuration shown in FIG. - A schematic diagram of an NTSC signal for one field is shown in Fig. 3a. In FIG. 3, V is a vertical synchronizing signal pulse. Furthermore, since there are no NTSC signals above and below the screen during cinemascope, the signal is schematically shown in Figure 3. Here 1~3.261~
263 is a no-signal period.

The level detection circuit 21 in FIG.
The average level of the signal during the 1H period in the figure is detected, and the average level signal "18" which is the detection output is output to the counter circuit 22. The counter circuit 22 is reset by the vertical synchronization pulse, and during the counter valid period, the average level of the signal is output to the counter circuit 22. Level signal "1"
If 8 is substantially at the zero level, it is counted, and if it is greater than the zero level, it is not counted.

Figures 3a and b' show an example of this,
When the input current NTSC signal is normally present, the count value of the counter circuit 22 remains zero as shown in FIG. 3a'. On the other hand, when the input current NTSC signal is in cinemascope mode, there is a no-signal period after the vertical synchronization pulse, so the counter circuit 2
The count value of 2 increases every horizontal scanning line period. The value counted by the counter circuit 22 is the count signal.
14 to the detection circuit 23 and the synchronous deflection circuit 16. The detection circuit 23 compares the count signal "14" with a predetermined value, and if the count signal "14" is equal to or greater than the predetermined value, the detection circuit 23 sets "°1" as the switching signal a15, and otherwise "0" as the switching signal a15. Output.

The signal conversion circuit 1o in Fig. 1 has synchronously separated NTSC
Signal a and external input signal a2 are input, which signal is subjected to scan conversion processing and signal reduction processing depending on the main screen or child screen, and the main screen signal a4 is converted to the child screen signal a.
5 is outputted and input to the composite image creation circuit 11, a composite image is created, and the composite image is output &6. The switching circuit 16 is controlled by the switching signal "15" from the signal detection circuit 14 described above, and when the switching signal "1B" is "1", the signal a which has not passed through the composite image creation circuit 11 for the cinemascope signal is switched. The switching circuit output is 16, and the switching signal is 15.
When is "0", the signal a6 obtained by processing the normal NTSC signal is set as the switching circuit output "16".

Moreover, the switching circuit 12 receives the NTSC signal a16. A high-definition television digital camera signal a3 is input and one of them is switched to produce an output signal a7. The high-definition television output device 13 receives the signal a7 and finally outputs it as an image.

In addition, if the input signal a1 is a normal NTSC signal, the output signal will be a 526-line (1:1) double-speed signal through scan conversion processing, so the vertical scanning signal will be as shown in Figure 4a, but the cinemascope When a signal is input, it is necessary to delete the upper and lower ends where there is no signal, as shown in Figure 4. The synchronous deflection circuit 16 performs this control. The synchronous deflection circuit 1e receives a count signal from the signal detection circuit 14.
14 is input, and since the count signal "14" indicates the number of horizontal scanning lines at the upper and lower end, which is no signal, the vertical scanning signal is controlled by the value of the count signal "14". For example, if the input signal &1 is as shown in Figure 3,
The upper and lower ends of no signal are each 3 horizontal scanning line periods (3
H) Therefore, by setting the vertical scanning line signal for this input signal a1 as shown in Figure 4, it is possible to always display an image on the entire screen even if the no-signal period of input signal &1 changes. .

Effects of the Invention As is clear from the above embodiments, the present invention detects a cinemascope signal using a level detection circuit, a counter circuit, and a detection circuit, changes the intermediate processing and vertical scanning signal, and converts the cinemascope signal into high quality. It has the effect of being able to output to the entire television output screen.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a high-definition television receiver according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a signal detection circuit in the developed embodiment of the present invention, and FIG. FIG. 1 is a waveform diagram showing various signals in the embodiment, FIG. 4 is a waveform diagram showing a vertical scanning signal for outputting a scan conversion signal made from a normal NTSC signal and a cinema scope signal, and FIG. 6 is a waveform diagram showing a conventional signal. FIG. 6 is a block diagram of a conventional high-definition television receiver. 10... Signal conversion circuit, 11... Composite image creation circuit, 12, 15... Switching circuit, 13
...High-definition television output device, 14...
... Signal detection circuit, 16 ... Synchronous deflection circuit,
21...Level detection circuit, 22...Counter circuit, 23...Detection circuit. Name of agent: Patent attorney Shigetaka Awano and 1 other cylinder diagram? 3. Figure 61-11 High quality TV can output screen JZ-11 Current television output screen g3° - External signal output screen 4° - Current television output screen f (Cinemascope signal /

Claims (2)

[Claims] (1) A signal detection circuit that receives an NTSC signal and a synchronization signal and determines whether the NTSC signal is a cinemascope signal, and a signal conversion circuit that receives at least two or more NTSC signals, converts the signal, and outputs the signal. and a composite image creation circuit that takes at least two or more outputs of the signal conversion circuit as input to form one image, and outputs the output signal of the signal detection circuit using the input signal and output signal of the composite image creation circuit as input signals. a switching circuit that selects a signal; a switching circuit that receives the output of the switching circuit and a high-definition television signal and outputs one of the signals; and a synchronous deflection circuit that outputs a vertical scanning line signal according to the output signal of the signal detection circuit. A high-definition television receiver characterized by comprising a circuit. (2) It is equipped with a level detection circuit that detects the signal level of an input signal during one horizontal scanning period, a counter circuit that is reset and started by a synchronization signal, and a detection circuit that outputs a control signal according to the counter output. A high-definition television receiver according to claim (1).