JPH0352465A - Television receiver - Google Patents

Abstract

PURPOSE:To perform appropriate reproduction without generating the omission and distortion of a high-definition television image by suppressing deterioration in resolution by providing a vertical deflection circuit which varies compressibly the vertical deflection amplitude of a CRT from reference amplitude of NTSC system so as to set the aspect ratio of the reproducing picture of a conversion television signal at 16:9 when performing the reproduction of a high-definition television signal. CONSTITUTION:The receiver is equipped with a high-definition television video processing circuit 6 which supplies the conversion television signal to the CRT 8 when the reproduction of the picture of the high-definition television signal is performed, and the vertical deflection circuit 10 which varies compressibly the vertical deflection amplitude of the CRT from the reference amplitude of NTSC system so as to set the aspect ratio of the reproducing picture of the conversion television signal in the reproduction of the picture of the high-definition television signal at 16:9. In other words, the conversion television signal of longitudinal image is formed by performing a digital filtering processing for the scan conversion of the high- definition television video processing circuit 6, and when the picture of the high-definition television signal is reproduced, the vertical deflection amplitude of the CRT can be varied compressibly from the reference amplitude of NTSC system with the vertical deflection circuit 10. In such a way, the appropriate reproduction without deteriorating the resolution and generating the omission and distortion of the high-definition television image is performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention uses an NTSC CRT to reproduce the screen of a MUSE high-visibility signal and the standard television signal of the NTSC system. Regarding television receivers.

[Conventional technology]

Conventionally, MUSK: system high-visibility training broadcasting was rNHK.
Technical Research” Volume 39, No. 2 (Total Volume No. 172) (Showa 6)
18-53, etc. (published in 2010) [As described here, this is implemented using a high-visibility signal called a MUSE signal whose band has been compressed by TCI multiple sub-sample band compression.

The MUSE system high-speed video signal has 1125 scanning lines. The field frequency is set to 6014z, and the aspect ratio is set to 16 (N to 9 (Fir)).

If you want to play back this Hi-Vis 1', Akugo as it is, you will need a large and expensive high-definition television receiver equipped with the MUSE decoder described in the above-mentioned literature and a CRT with an aspect ratio of 16:9. .

On the other hand, current television broadcasting using the NTSC system has 525 scanning lines. Field frequency 59.94H. L, standard television number with an aspect ratio of 4:3 (hereinafter referred to as NTS)
C signal).

In addition, pages 359-364 of "NHK Giken Monthly Report" (published September 1985) and pages 93-100 of "Broadcasting Technology" (September 1988, published by Kenrokukan Publishing Co., Ltd.) contain high-definition signals. A mode that truncates horizontal information, B mode that compresses horizontal information, or C mode that compresses vertical and horizontal information. Scanning based on 7 aspect ratio conversion and vertical and horizontal digital filter processing. Convert and convert high-visibility signals to NTSC with an aspect ratio of 4:3.
A high-visigon/NTSC converter for converting the signal to a NTSC signal is described.

The signal converted and formed by this converter can be displayed on a current television receiver equipped with an NTSC CRT, just like an NTSC signal.

And “Sanyo Technical Review JVoL, 21
．． No. 2 (published June 1989), 40-47
On the page, the NTSC system with an aspect ratio of 4:3 is created by combining a high-visibility/NTSC converter (high-vision:/MUSE/NTSC converter) that performs aspect ratio conversion and scan conversion of the A mode with a current television receiver. A television receiver (hereinafter referred to as a common television receiver) that uses a CRT to switch between high-definition signal images (high-definition images) and NTSC signal images (NTSC images) obtained by reception and playback of recording media. ) has been proposed.

[Problem to be solved by the invention]

In the case of a shared television receiver that uses the conventional high-visibility/NTSC converter, when the A or B mode aspect ratio conversion is performed by the converter, the high-visibility image reproduced on the CRT screen is This results in an image with missing left and right edges or a vertically distorted image, which poses a problem in that high-definition images cannot be reproduced properly.

Furthermore, if aspect ratio conversion of C+:2 is applied, the above-mentioned deletions and distortions do not occur, but vertical compression is performed by truncating the scanning lines to correct the distortion, and the scanning of the signal after scan conversion is The number of lines is reduced from 525 as specified in the NTSC system, and this reduction also causes the number of effective scanning lines to decrease from 480, resulting in a problem that the resolution of the high-definition image is significantly degraded.

SUMMARY OF THE INVENTION An object of the present invention is to provide a common television receiver that suppresses deterioration of resolution using an NTSC CRT and properly reproduces high-visibility images without missing or distorted images.

[Means to solve the problem]

In order to achieve the above object, the television receiver of the present invention uses the NTSC system scanning line number, which compresses horizontal information of a high-visibility signal through horizontal and vertical digital filter processing. a high-definition video processing circuit for forming a horizontally long converted television signal and supplying the converted television signal to a CRT when the screen of the high-visibility signal is reproduced; The vertical deflection amplitude of the CRT is adjusted so that the spectral ratio of the NTSC
and a vertical deflection circuit that can vary the amplitude from the standard amplitude of the system.

[Effect]

In the case of the television receiver of the present invention configured as described above, the digital filter processing of the scan conversion of the high-definition video processing circuit converts the television signal into a vertically long image similar to that in the conventional 8-mode case. is formed.

When a high-definition signal is reproduced, the vertical deflection of the CRT is varied to be reduced from the standard amplitude of the NTSC system by the vertical deflection circuit.

Due to this variable reduction, the high-visibility image displayed on the CRT is compressed in the vertical direction to the original aspect ratio without reducing the number of scanning lines, resulting in a proper image without distortion.

Therefore, there is no deterioration in resolution due to the truncation of scanning lines for distortion correction as in the conventional 'C mode-1'.
RT allows proper reproduction without missing or distorted high-visigon images.

〔Example〕

Examples will be described below with reference to FIGS. 1 to 4.

(First Embodiment) First, the i-th embodiment will be described with reference to FIG. 1 and FIG. 2.

In Figure 1 f, (1). (2) is the input terminal for the NTSC signal and MUSE signal obtained by reception or playback of the recording medium, (3) is the NTSC synchronization separation circuit, (4) is the NTSC video processing circuit, and (5) is the high-visibility 3-in synchronization circuit. The separation circuit (6) is a high-definition video processing circuit.

(7) is a video intensifier circuit, (8) is an NTSC CRT
, (9) is a horizontal deflection circuit, and (11) is a vertical deflection circuit.
is an input terminal for a display selection signal.

When playing the screen of NTSC signal, NTSC ('
The f'r signal is connected from the input terminal (1) to the NTSC synchronization separation circuit (
3) and an NTSC video processing circuit (4).

At this time, the NTSC synchronization separation circuit (3). The NTSC video processing circuit (4) is composed of one analog or digital synchronization separation circuit and video processing circuit of a conventional NTSC television receiver, and the synchronization separation circuit (3) is N?
The horizontal and vertical synchronization signals of the SC signal are detected, and the video processing circuit (4) performs video processing such as brightness/color separation and color decoding on the NTSC signal.

Furthermore, the horizontal .NTSC synchronization separation circuit (3). The vertical detection signal is sent to the horizontal deflection circuit (9) and the vertical deflection circuit (1111).
This is supplied to the NTSC video processing circuit (4).
The SC signal is sent to the CRT (8) via the video amplification circuit (7).
).

Furthermore, based on a display mode selection operation, an NTSC display selection signal is supplied from the input terminal αυ to the horizontal deflection circuit (9) and the vertical deflection circuit αO.

And, NTSC display selection signal @1 based dual deflection circuit (9). θq is the horizontal direction of the NTSC synchronous separation circuit <3),
CRT in synchronization with vertical detection signal (8) i2m NT
Performs standard horizontal and vertical deflection control of the SC method.

Therefore, when playing the screen of NTSC signal, CRT (8)
The amplitudes of the horizontal and vertical deflection voltages are equal to the standard vibration C, and the CR. T(8
)}An NTSC image with an aspect ratio of 4:3 is played back on the screen.

Next, when playing the high-visit 3-in signal screen, press MUSE
The signal is sent from the input terminal (2) to the high-definition sync separator circuit (
5), and is supplied to the high-visibility 3-inch video processing circuit (6).

The high-visibility synchronization separation circuit (5) is connected to the MUSE
The horizontal and vertical synchronizing signals (horizontal synchronizing pulse, frame pulse) of the signal are detected, and the horizontal and vertical detection signals are supplied to the horizontal deflection circuit (9) and the vertical deflection circuit αQ.

In addition, the high-definition video processing circuit (6) performs digital filter processing in the vertical and horizontal directions, and the number of scanning lines is 112.
NTS with 525 scanning lines (approximately 480 effective scanning lines)
Scan conversion is performed to a C format signal.

At this time, like vertical digital filter processing,
l0 of the cheek in the screen of 1125 scanning lines of MUS E signal
50 pieces are extracted and thinned out by l/26.

In addition, by horizontal digital filter processing, MUSE
The horizontal information of the signal is resampled and compressed, and the horizontal length of the signal after scan conversion becomes the horizontal length of the NTSC system.

Furthermore, six signals after scan conversion are subjected to TCI decoding processing, analog conversion, etc., and a converted television signal as a signal of the NTSC system is formed.

Therefore, a MUSE signal with an aspect ratio of 1 and a ratio of 1 to 6 to 9 is an NTSC flag converted television signal with an aspect ratio of 1 and a ratio of 4 to 3, with 525 scanning lines compressed without truncating horizontal information. The image is scan-converted into a video amplification circuit (
7) to the CRT (8).

On the other hand, a selection signal for high-definition display is supplied to the horizontal deflection circuit (9) and the vertical deflection circuit (101) from the input terminal αυ.

The selection signal 1 for high-visibility 3-screen display is based on the image deflection circuit (9), and Ql is the high-vision synchronization separation circuit (5).
) in synchronization with the horizontal and vertical detection signals of C RT (8)
horizontal and vertical deflection control.

At this time, the converted television signal is formed by forcibly compressing the 16:9 aspect ratio of MUSE {Fi to 4:3. Based on the difference in compression ratio, a distorted high-definition image is reproduced on the CRT (8), as in the case of the conventional B mode.

Therefore, when the vertical deflection circuit a0 is supplied with the high-visibility display selection signal, it changes the vertical deflection voltage of the CRT (8) to the second level.
As shown by the solid line in the figure, the voltage V with the standard amplitude shown by the broken line in the figure
, to Vz (vt<v, ). In addition,
tv in FIG. 2 indicates the vertical synchronization period.

Therefore, when playing a high-definition signal screen, C RT
The vertical deflection amplitude (8) is varied to be reduced from the standard amplitude of the NTSC system, and the vertical direction of the display screen of the CRT (8) is shrunk.

Note that the horizontal deflection circuit (9) operates in the same manner as when the selection signal for NTSC display is supplied, and the display screen does not shrink in the horizontal direction.

Then, based on the shrinkage of the display screen in the fir direction, the high-definition image of the converted television signal is reproduced on the screen with the original aspect ratio of 16:9 and without distortion (CRT (8)).

Therefore, when a high-definition signal is reproduced on a screen, a high-definition image with no missing left and right edges and no distortion is reproduced on the CRT (8) while preventing resolution deterioration due to distortion correction.

The digital processing of the high-definition processing circuit (6) is not limited to the embodiment, and for example, a vertical low-pass filter with an appropriate number of taps may be used to improve the image quality. You can.

(Second Embodiment) Next, a second embodiment f will be explained with reference to FIG.

The difference in FIG. 3 from FIG. 1 is that a high-definition discrimination circuit (self) is provided in place of the input terminal αD.

When the screen of the high-visibility 3-in signal is supplied to the input terminal (2), the high-vision discrimination circuit (
6) is a horizontal deflection circuit (9) based on the detection of a characteristic signal of the MUSE signal, such as a synchronization signal such as a frame pulse.
The selection signal supplied to the vertical deflection circuit 00 is inverted from the NTSC display to the high-definition display G level.

As a result of this level inversion, the vertical deflection amplitude of the CRT (8) is reduced and varied in the same way as in the case of FIG. Effects can be obtained.

(Third Example) A third example will be described below with reference to FIG. 4.

The difference between FIG. 4 and FIG. 3 is that an NTSC discrimination circuit αJ is provided in place of the high-definition discrimination circuit (self).

Then, the NTSC discrimination circuit 0 detects a characteristic signal of the NTSC signal. For example, based on the detection of a negative synchronization signal, the level of the selection signal supplied to the horizontal deflection circuit (9) and vertical deflection circuit αQ is inverted from high-definition display to NTSC display.

Therefore, when a high-visibility signal screen is reproduced when no NTSC signal is supplied to the input terminal (1), a high-visibility override display selection signal is supplied from the NTSC discrimination circuit 0 to both deflection circuits (9) and Ql.

Therefore, the same effects as in the second embodiment can be obtained.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

Digital processing of scan conversion in the high-definition processing circuit converts the high-definition signal into a converted television signal with the number of scanning lines and horizontal length of the NTSC system without cutting off horizontal information, as well as screen reproduction of the high-definition signal. When the vertical deflection amplitude of the CRT is N by the vertical deflection circuit,
The aspect ratio of the reproduced screen based on the converted television signal C, which is reduced and varied from the standard amplitude of the TSC system, becomes the aspect ratio of the original high-definition signal, 16:9.

Therefore, the vertical distortion of the image of the converted television signal due to the difference in aspect ratio is corrected without cutting off the scanning lines, and a complete high-definition image is reproduced on the CRT without distortion while suppressing resolution deterioration.

Therefore, when performing screen playback of MUSE high-definition signals and NTSC standard television signals alternatively using a compact and inexpensive configuration using an NTSC CRT, resolution deterioration due to distortion correction is avoided. It is possible to reproduce high-definition images without any loss or distortion.

[Brief explanation of drawings]

The drawings show an embodiment of the television receiver of the present invention. Figure 1 is a pro-noc diagram of the first embodiment, Figure 2 is a vertical deflection voltage waveform diagram, Figures 3 and 4 are waveform diagrams of the vertical deflection voltage. 2. It is a block diagram of the example of @3. (3)...NTS C synchronization separation circuit, (4)...NT
SC video processing circuit, (5)...high-definition synchronization separation circuit, (6)...) ibidicon video processing circuit, (8)
)...CRT. (9)...Horizontal deflection circuit, QO
...Vertical deflection circuit.

Claims (1)

[Claims] [1] NTSC CRT with an aspect ratio of 16
In a television receiver that selectively plays back a 9:3 MUSE high-definition signal and a 4:3 aspect ratio NTSC standard television signal, digital filter processing in the horizontal and vertical directions is used. Forming a converted television signal having the number of scanning lines and horizontal length of the NTSC system by compressing horizontal information of the high-definition signal,
a high-definition video processing circuit that supplies the converted television signal to the CRT when the high-definition signal is reproduced; A television receiver comprising: a vertical deflection circuit that reduces and varies the vertical deflection amplitude of the CRT from a standard amplitude of the NTSC system.