JPH0352473A - High-definition television image reproducing device - Google Patents

Abstract

PURPOSE:To effectively use a screen by eliminating the null part of an image based on the difference of an aspect ratio by substituting a second video signal of reference television system for the null part without having an image of a first video signal with a signal switching circuit. CONSTITUTION:The above device is equipped with a system conversion part 2 which forms the first video signal of reference television system, the input terminal 3 of the second video signal, and the signal switching circuit 4 which substitutes the second video signal for the null part of the first video signal and supplies the synthetic signal of both video signals to a display device of reference television system. At such a case, the first video signal V1 is formed by applying conversion on a high-definition television signal with the system conversion part 2, and furthermore, the second video signal V2 at the input terminal substitutes for the null part of the first video signal without having the image with the signal processing circuit 2, and the video signal of reference television system in the synthetic picture of the picture of the high- definition television signal and that of the second video signal V2 is supplied to the display device. Thus, the reproduction of another picture can be performed simultaneously by utilizing the null part based on the difference of the aspect ratio, thereby, the screen can be effectively used.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention compresses a high-definition signal having an anuvect ratio different from that of the standard television format in the vertical and horizontal directions so as not to change the aspect ratio, thereby producing a video signal of the standard television format. The present invention relates to a high-definition image reproducing apparatus that converts the format of the video signal into the second image signal and reproduces the screen by supplying the video signal as the second image signal.

[Conventional technology]

Conventionally, video signals of the NT80 standard television system (hereinafter referred to as NT8
C signal) has 525 scanning lines, field frequency of 59.94Hz, and aspect ratio of 4 (horizontal) to 3 (vertical).
is set to .

1.The MUSg system high-definition signal has 1 scanning line.
125 lines, a feed frequency of 60 Hz, and an aspect ratio of 16 (horizontal) to 9 (vertical).

Since the aspect ratio of the NT8C signal and the high-definition signal is different, for example, when reproducing the image of the high-definition signal using the CRT of a current television receiver, l'-NHK Giken Monthly Report Vol. ．． 28J (published September 1985), 359-364 summer, “Broadcasting Technology J
(September 1986, published by Kenrokukan Publishing Co., Ltd.) 93~
100 pages and “SANYO TECHNICAL V?: 7 U-
VoI! ．． 21 1h2J (published June 1989) Hi-Vision/NT8C described on pages 040-47
A high-definition image reproducing device, which is controlled by a converter, converts the high-definition signal into A, B, or C mode, converts the high-definition signal into an NTSC signal, and supplies the signal to the CRT.

Next, a description will be given of the screens shaped by the conversion of each mode of A, B, and C.

In the case of A-mode format conversion, as shown in Figure 3(a), the screen (Pa) with an aspect ratio of 16:9 for a high-definition signal (dotted line) is changed to an aspect ratio of 4 (solid line) by cutting off the left and right edges. The image is converted to a Pb-3 NTSC signal screen (Pb).

In addition, in the case of B mode format conversion, as shown in the same figure (b), the broken line high-definition signal screen (Pa) is compressed in the horizontal direction and converted to the solid line NT8C signal screen (Pb). .

Furthermore, in the case of C mode format conversion, as shown in the figure (C), the screen (Pa) of the high-definition signal indicated by the broken line is vertical. A screen with a 16:9 aspect ratio (
Pa).

When A and B mode format conversion is performed, the aspect ratio changes, so the reproduced screen of the high-definition signal after conversion becomes a screen with the left and right edges of the original screen cut off, and a screen that is distorted vertically.

On the other hand, when C-mode format conversion is performed, the aspect ratio remains unchanged, so the reproduced screen of the high-definition signal after conversion is a screen obtained by reducing the original screen by t1.

Therefore, high-definition signals can be processed without image loss or distortion.
When converting the format to an NT8C signal, a high-definition image reproducing device that performs C mode format conversion is used.

[Problem to be solved by the invention]

In the case of a conventional high-definition image playback device that performs the C-mode format conversion, the playback screen with an aspect ratio of 4:3 on a display device such as a CRT based on the converted signal is as shown in FIG. 4(a).
．． As shown in (b) and (C), blank areas (PX) with no diagonal images appear at the top, bottom, and both ends of the compressed high-definition signal screen (Pa)', making it possible to effectively utilize the screen. There are some problems that cannot be solved.

When the standard television system is PAL, SECAM, etc., and when the high-definition signal is a system other than MUSE, the same conversion as the C mode format conversion is performed, and the high-definition signal is vertically converted so as not to change the aspect ratio. If the video signal is horizontally compressed and converted into a standard television format video signal, problems similar to those described above arise.

The present invention eliminates blank areas in images due to differences in aspect ratio when converting a high-definition signal into a standard television format video signal by compressing it in the vertical and horizontal directions without changing the aspect ratio and then playing it back on screen. An object of the present invention is to provide a high-definition image playback device that makes effective use of the screen.

[Means to solve the problem]

In order to achieve the above object, the high-definition image reproducing device of the present invention compresses a high-definition signal having an aspect ratio different from that of a standard television format in the vertical and horizontal directions so as not to change the aspect ratio, and compresses the high-definition signal at either the upper end or the lower end. a format converter for converting a first video signal of a standard television format having a blank section on one or both sides; an input terminal for a second video signal of a standard television format;
8! The blank portion of the &1 image signal is replaced with the second image signal, the combined signal of both the video signals is replaced with the second image signal, and a composite signal of both the image signals is provided.

[Effect]

In the reproducing apparatus of the present invention constructed as described above, the format converting section performs the same conversion as the conventional C mode format conversion on the b high-definition signal to form the first video signal.

Furthermore, the signal switching circuit replaces the blank area without an image of the first video signal with the second video signal of the input terminal, and the screen of the high-definition signal and the screen of the second video signal are combined to match the standard television format of the screen. video signals are supplied to the display device.

Therefore, the above-mentioned match screen is displayed on the playback screen of the display device, and the screen is effectively used without any blank space.

〔Example〕

Regarding the embodiment, Part 1! This will be explained below with reference to FIG.

In FIG. 1, (1) is an input terminal for the high-definition signal Vi of the MUSE system, and (2) is a system converter that converts the high-definition signal Vi into the first video signal V+ of the NTSIJJ quasi-TV system, and a vertical interpolation filter. (2B) . Consists of buffer memory (2b).

(3} is an input terminal for the second video signal v2 of the NTSC standard television system, (4) is a signal switching circuit that forms a video signal 0 which is a combination of the first and second video signals V+ and V2,
The video signal vO is supplied to the second image signal of an NT80 such as a CRT of a current television receiver via an output terminal r5).

Then, the high-definition signal Vi at the input terminal (11) is converted from 1125 to 525 scanning lines by the interpolation process of the vertical interpolation filter (2a) of the format conversion unit (2).
Transfer the data to the buffer memory (2b).

This buffer memo IJ (2b) has a write control signal W,
Based on the control of the readout control signal r, the vertical interpolation fine letter (
The output signal of 2a) is compressed vertically and horizontally, and the high-definition signal is converted to NTSC without changing the aspect ratio.
The first video signal Vl format-converted to a standard television format signal
form.

At this time, the high-definition signal screen (Pi) shown in FIG. It is fitted into the housing as a screen (Pi)' with an aspect ratio of 16:9.

Also, depending on the read timing of the buffer memory (2b), the position of the blank area (PX) without an image in FIG.
Figure 4(a). Either (b) or (e).

Then, the I-th video signal Vl read from the buffer memory (2b) is supplied to the signal switching circuit (4), and the second video signal V2 is supplied from the input terminal (3) in synchronization with the first video signal Vl. The signal is supplied to the signal switching circuit (4).

Furthermore, by switching control based on the readout control signal r of the system converter (2), the signal switching circuit f4) is switched to the first video signal V.
The first video signal V! at the timing of the blank part (Px) of +. The output is switched from the output of the second video signal V2 to the output of the second video signal V2.

At this time, if the second video signal 2 is a signal of the screen (P2) opposite to the image (A) shown in FIG. The blank portion (Px) of the video signal v1 is replaced with the second video signal v2, forming the video signal Vo of the screen (PO) shown in FIG.

Then, the video signal ■0 is transmitted to the CR.
The screen of the video signal Vo (Po
), that is, the screen (Pi) with no deletions or distortions in the converted high-definition signal and the image (uniform) of the second video signal v2 are displayed without any blank areas.

By the way, the second video signal v2 is a character formed using a multiplied broadcasting signal, a reproduction signal of a recording medium, a character generator, or the like. Consists of graphical signals.

Then, for example, using a character generator etc., the second
=e When formatting the video signal v2, characters for playback information such as receiving channel, volume, time, etc. are placed in the image direction part of FIG. 2(C). The display performance can be improved by adjusting the arrangement of figures.

In addition, for example, an image compression circuit may be provided between the input terminal (3) and the signal switching circuit (41), and this compression circuit may be used to convert the broadcast screen, playback screen, etc. of the υλ power terminal (3) approximately as shown in Fig. 2 (C). The second video signal ■2 is compressed to the size of the image (B), or
A complete two-screen playback display may also be performed.

Furthermore, the format of the high-definition signal and the second video signal and the structure of the format converter are not limited to the embodiments.

〔Effect of the invention〕

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

The format converter converts the high-definition signal into the first video signal of the standard television format without changing the aspect ratio, and the signal switching circuit also converts the blank part without an image of the first video signal to the standard one. It is replaced with the second video signal of the television system.

Through this substitution, a standard television system video signal of a combined screen of the high-definition signal screen and the second video signal screen is formed, and this video signal 9 is supplied to the second image signal and displayed.

Therefore, when playing back a high-definition signal by converting the format so that blank areas do not appear on the display screen and do not cause deletions or distortions, the blank areas based on the 4-difference in aspect ratio are used to Screen playback can be performed at the same time, making effective use of the screen.

[Brief explanation of drawings]

1 and 2 show one embodiment of the high-definition image reproducing device of the present invention, FIG. 1 is a block diagram, and FIG. 2(a)
, (b). (C) and (d) are front views of the screen for explaining the operation, and Fig. 3 "a), σ)>. (C) is M
Front view of both sides of the ULE high-definition code for explaining the format conversion, Figure 4 (a). (b). (c) is a front view of a conventional reproduction screen. (21... system converter, (3)... second video signal input terminal, (41... signal switching circuit).

Claims (1)

[Claims] [1] A high-definition signal with an aspect ratio different from that of a standard television system is compressed in the vertical and horizontal directions so as not to change the aspect ratio, and a blank space is created at either or both of the upper end and the lower end. a scan converter for forming a first image signal of a standard television system, an input terminal for a second image signal of a standard television system;
A high-definition image reproducing device comprising: a signal switching circuit that replaces the blank portion of the image signal with the second image signal and supplies a composite signal of both image signals to a standard television display device.