JPH0352475A - High-definition television image reproducing device - Google Patents

Abstract

PURPOSE:To perform the scan conversion of a high-definition television signal to a video signal of NTSC system without generating omission at both right and left ends by providing a sampling number conversion circuit and a signal switching circuit. CONSTITUTION:A horizontal compression signal of longitudinal image can be formed by thinning only the high-definition television signal in a horizontal direction with the re-sampling processing of the sampling number conversion circuit 12. Furthermore, the signal is formed with an image based on the high-definition television signal by the substitution of the signal processing circuit 13, and both the right and left ends are supplied to a scan conversion circuit 3 by substituting the horizontal compression signals for the right and left ends of the high-definition television signal. At this time, the length of the horizontal compression signal in the horizontal direction is set so as to be almost equal to that of the right and left ends of the high-definition television signal after round-down. Therefore, the reproducing image of a video signal of NTSC system after the scan conversion goes to a synthetic image whose center part is formed with the image in which the right and left ends of the high-definition television signal are compressed. In such a way, the high-definition television signal can be converted to the video signal of NTSC system without generation the omission at right and left ends.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention converts a MULE high-definition signal into an NTSC signal using a simple method of cutting off information at the left and right edges, and converts this signal into an NTSC signal. The present invention relates to a high-definition image reproducing device for supplying to display devices and the like.

[Conventional technology]

Conventionally, high-definition broadcasting using the MUSE system was introduced in ``NHK Technical Research,'' Vol. 39, No. 2 (Total Volume No. 172, No. 1)
As stated on pages 18 to 53 of the 2017 publication),
MTJSE with TCI multiple subsampling/I/bandwidth compression
It is implemented using a band-compressed high-definition signal called a signal.

The MUSE system high-definition signal has 1125 scanning lines, a field frequency of 59Hz, and an aspect ratio of 16 (horizontal). It is set to i9 (vertical).

When reproducing this high-definition signal on one screen of the cabinet,
A large-sized, high-quality, high-definition television receiver equipped with a CRT having an aspect ratio of 16:9 and a ``MUSr''' decoder described in the above-mentioned literature is required.

On the other hand, current television broadcasting using the NTSC system has 5 scanning lines.
The test is carried out using standard television signals (hereinafter referred to as NTSC signals) with 25 lines, a field frequency of 59.94 Hz, and an aspect ratio of 4:3.

In addition, 3 of "NHK Giken Monthly Report" (published September 1985)
Pages 59 to 364, pages 93 to 100 of "Broadcasting Technology" (September 1988, published by Kenrokukan Publishing Co., Ltd.), A mode that cuts off horizontal edge information of high-definition signals, Describes a high-definition/NTSC converter that converts high-definition signals into NTSC format signals with an aspect ratio of 4:3 by converting the B71 mode that compresses information or the C mode that compresses information in the vertical and horizontal directions. has been done.

Since simple conversion of A mode can be performed with a relatively simple structure,
21, Group 2 (published June 1989) 40-47
The page describes a high-definition/high-definition image playback device that performs the input mode conversion as shown in FIG.
An NTSC converter (high-definition MUSE/NTSC converter) is described.

The converter shown in FIG. 3 converts a MUSE signal at an input terminal (1) into a digital signal by an A/D conversion circuit (2) and supplies the digital signal to a scan conversion circuit (3) and a synchronization separation circuit (4).

The scan conversion circuit (3) consists of a small time base converter with a line memory structure, and based on write/read control, it equivalently truncates the information at the left and right ends of the MUSE signal and reduces the number of scan lines. The MTJSE signal is thinned out and converted into a digital signal with an aspect ratio of 4:3, horizontal length, and number of scanning lines of the NTSC system.

In other words, the number of scanning lines includes approximately 480 effective scanning lines, which is thinned out by half by omitting approximately 70 upper and lower lines from the approximately 1030 effective scanning lines of the MUSE signal.
Convert to 525 lines of the method.

Regarding the horizontal direction, approximately 754+% of the center portion of the screen with an aspect ratio of 1 and 4:3 based on the vertical direction is extracted and information on the left and right edges is discarded.

Nafu・Actually, the luminance signal of hH″fSE signal (hereinafter referred to as Y
Conversion of the number of scanning lines described above for a two-color signal (hereinafter referred to as a C signal). Horizontal truncation is applied.

Furthermore, since there is almost no difference in field frequency between the MUSE signal and the NTSC signal, so-called field frequency conversion is not performed.

Then, the fCY signal outputted from the scan conversion circuit (31) is subjected to line-to-line interpolation of vertical interpolation by a simple Y signal buoy A notator (51) with three taps in the vertical direction, and is then subjected to actual scanning line number conversion. Ru.

The C signal received from the scan conversion circuit +31 is T
The time axis is expanded and restored by the Cl decoder (6),
The 0 signal is supplied to the 0 signal filters (7) and (81) as color difference signals of R-Y and Ij-Y.

And both C signal filters (7). C8) performs interline interpolation of vertical interpolation to perform actual scanning line number conversion.

Furthermore, Y signal filter (5) and C signal filter +7
1, the output signal of f81 is 07A. 71.! via the conversion circuit (9). J 7 circuit QGK is supplied, and this matrix circuit No. forms the three primary color signals of R, G, and H as the video signal of the horizontal length and number of scanning lines of the NTSC system.

On the other hand, the synchronization separation circuit (4) detects the synchronization signal (frame pulse, horizontal synchronization pulse) of the MULE signal,
Based on the detection signal of the synchronization separation circuit (41), a timing control circuit (11) forms a timing signal for controlling the operation of each part.

Then, the three primary color signals of the matrix circuit aI1 are, for example, N
It is supplied to a TSC type CRT, and the MUSE
A high-definition image based on the signal is played back and displayed.

At this time, the original image of the MUSE signal is, for example, shown in FIG.
) If the image (Po) has an aspect ratio of 16:9 as shown in ), the image reproduced and displayed on the CRT will have an anuvect ratio of 4:3 with the left and right edges of the image (PO) shaved off, as shown in fb) of the same figure. The image becomes (P+).

[Problem to be solved by the invention]

? In the case of the conventional high-definition image reproduction device shown in Fig. 3,
The configuration is simple and does not cause image deformation or resolution deterioration, but scan conversion The later reproduced image will be an image with the left and right edges of the original image missing.

So, for example, f is element:′. ) [I! II! 4I - In the case where important information is included at the end of the pressure plate (1), there is the problem that important information is deleted at the end of the press (1) due to IT conversion, and (e) the present invention solves the problem of By adding a simple same path to the conventional device, the left and right ends are missing ■・,・゜・・1′ bib S3;
TSC system video transmission R/K running safety hi-vi. 2. To achieve the above-mentioned object, the present invention aims to provide a non-image reproducing device. The reproduction device 1d re-processes the information in the /k horizontal direction of Hi-Vino 2, Even 9, and subtracts it by 111 by processing. The Q-'fAl number conversion circuit forms the horizontal compressed signal Sna compressed to the length after truncating the information, and the horizontal A signal switching circuit is provided which replaces the compressed signal with a signal and supplies it to the scan conversion circuit, and replaces the left and right ends of the video signal formed by scan conversion with a signal obtained by thinning out the number of scanning lines of the horizontal compression signal.

[Effect]

In the case of the playback device of the present invention constructed as described above, the horizontal compression signal of the vertically long image obtained by thinning out and compressing the 0 in the horizontal direction of the high-definition signal is obtained by the reprocessing of the sample number conversion circuit. be shaped.

Furthermore, by switching the signal switching circuit, the left and right ends of the high-definition signal are replaced with horizontal compressed signals and supplied to the scan conversion circuit at f1.At this time, the horizontal length of the horizontal compressed signal is approximately Since the length is after the truncation of the left and right ends of the high-definition signal - τ, the reproduced image of the NTSC video signal after scan conversion is
A composite image is formed in which the center part is formed by an image based on a high-definition signal, and the left and right ends are formed by compressed images of the left and right ends of the high-definition signal.

Then, the center part and the left and right ends of the combined image are continuous.
,,I,, Since the images at the left and right ends of the original image of the high-visibility 17 signal are placed vertically at the left and right ends ffls, the conventional device shown in Fig. By adding a number conversion circuit and a signal switching circuit, a high-definition signal is converted to an NTSC video signal without missing the left and right edges.

[Example]

One embodiment will be described below with reference to FIGS. I and 2.

1, the difference from FIG. 3 is the Sandel number conversion circuit 13, the signal switching complex, and the switch a of
Timing 7゛The control circuit (11) also outputs a timing signal for controlling the operation of the sampling to number conversion circuit αZ9 switch (Ll).

Then, the digital # double number of the A/D conversion circuit (2) is supplied to the synchronization separation circuit (4), the sample number conversion circuit 02, and the contact (a) of the switch α3.

At this time, the circuit 1'/I/multiple switching circuit a converts the digital signal into the following medium (i+). One of the re-sampling processes (iii) is performed to thin out the horizontal information of the MUSE signal so that the horizontal information is compressed to approximately 7596 after being truncated, thereby forming a horizontal compressed signal.

(1) Extract l digital A/signal signals every n.

(n) After performing horizontal low-pass filter processing on the digital signal to remove aliasing distortion caused by resampling, one out of every n samples is extracted.

(m) Convert the frequency of the digital signal and convert it into β (α
〉β) Extract, equivalently inside. Extract the same number of items as (++).

Note that the process (1) can be performed with the simplest structure using a simple sampling circuit, and Cii). (The processing of l is (
This can be done by adding a low-pass filter/I/F and a frequency conversion circuit to the structure of 1).

When the process (1i) is applied, aliasing distortion is removed, and the image quality is improved compared to when the process (1i) is applied.

Furthermore, when processing is applied, the range of thinning rate is β
Based on the two-variable control of /α, it is wider than the l-variable control of l/n of medium and (H), and it is easier to design concave roads.

Then, based on the thinning of information in the horizontal direction, the horizontal compression signal becomes, for example, a signal of a vertically long image obtained by compressing the horizontal direction of the original image (PO) in FIG. It is supplied to the other contact (b) of α3.

For example, the contact of switch a3 ( Patufa (not shown) in front of a)
will be provided.

On the other hand, based on the detection signal of the synchronization separation circuit (4), the timing control circuit 011 forms a timing signal for controlling the operation of each part, such as a sampling pulse, and also controls the l-line in synchronization with the detection signal of the horizontal synchronization panorez, for example. The sampling number counter is used to repeatedly count the sampling vanores, and a timing signal for switching is generated which is inverted at a predetermined timing on the left and right sides of each line of the MULF signal.

Then, a switch 03 based on a timing signal for switching
By switching the switch 03 to the scan conversion circuit (3)
The signal supplied to contact f at the left and right ends of the MUSE signal
From the digital signal of the A/D conversion circuit (2) in a), the digging point (
It is replaced by the horizontal compression signal of the Zanfur number variable circuit (own) in b).

With this ε, the reversal timing of the switching timing signal is closer to the center than about 75% of the center portion extracted from the MULE signal by the scan conversion circuit {3}, and is based on the digital signal of the A/D conversion circuit r2+. The timing is set at which the image and the image based on the horizontal compression signal of the ZANDE/RE@ conversion circuit 0 are continuous.

Therefore, the image of the three primary color signals as the NTSC video signal output from the matrix circuit αO after being truncated in the horizontal direction by the scan conversion circuit (3) and thinned out in the number of scanning lines is shown in FIG. ).

In other words, the image (P2) in Fig. 2 <c> is an A/D conversion circuit! The central part (E) based on the digital ρ signal of No. 21 is shown in the same figure (
The image has no deformation, which is the same as the center of the image (h) in b), and the left and right edges (J?) . (r) is an image of the left and right end portions of the MUSE signal that are continuous to the center portion (b).

So, the MU that was truncated in the conventional A mode conversion
The information on the left and right ends of the SE signal is the left and right ends (6, (r)
The image (O) displays information about the entire image of the MUSE signal.

Therefore, aspect ratio conversion such as the conventional B, C-F--code conversion can be performed by simply adding a Sand/I number conversion circuit 0 and a Nuitschi α to the conventional device shown in FIG. The MULE signal is converted to an NTSC video signal without any edge information without any complicated compression.

Furthermore, the present invention is not limited to the structures or embodiments of the filters (5), (7), (81, etc.).

1. In the above embodiment, the output signal of the D/A conversion circuit (9) was supplied to the matrix circuit αG, and the three primary color signals were formed through analog matrix processing, but the D/A conversion circuit (9)
A matrix circuit having a digital circuit may be provided at the front stage of the digital p-matrix processing, and the signal after digital p-matrix processing may be converted into an analog signal by a D/A conversion circuit (9) to form three primary color signals.

〔Effect of the invention〕

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

By resampling the sample number conversion circuit, a horizontally compressed signal of a vertically long image is formed by thinning and compressing only the horizontal direction of the high-definition signal, and by replacing the signal switching circuit, the left and right ends of the high-definition signal are converted into a horizontally compressed signal. is replaced with and supplied to the scan conversion circuit.

At this time, the horizontal length of the horizontal compressed signal is approximately the length of the high-definition signal after truncating the left and right ends, so
The reproduced image of the NTSC video signal after scan conversion is a composite image in which the center part is an image based on the high-definition signal, and the left and right edges are compressed images of the left and right ends of the high-definition signal. .

Then, the central part and left and right end parts of the combined image are continuous,
Moreover, since the images at the left and right ends of the original image of the high-definition signal are arranged vertically at the left and right ends, the conventional A
Adding a simple Zump p number conversion circuit and a signal switching circuit to a simple mode device 4? With this configuration, the Yago Binyong signal is N without missing the left and right ends.
It is possible to convert to a TSC video signal.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the high-vison to 7-inch image reproducing apparatus of the present invention.
, ('e) is the front view of the screen, and Figure 3 is the conventional device tf.
) f (:x diagram, (3)...scan conversion circuit...02-ner/noise number conversion circuit, α3...
・S(=:y4-.,

Claims (1)

[Claims] (1) A MUSE high-definition signal with an aspect ratio of 16:9 is supplied to a scan conversion circuit, and the scan conversion circuit cuts off horizontal edge information of the high-definition signal and thins out the number of scanning lines to convert the aspect ratio to 4. Converts to a video signal with the horizontal length and number of scanning lines of the NTSC system of 3 pairs,
In a high-definition image reproducing device that supplies the video signal to an NTSC display device or the like, the horizontal information of the high-definition signal is thinned out by resampling processing, and the horizontal direction of the high-definition signal is approximately equal to the information after truncating the edge information. a sample number conversion circuit that forms a horizontally compressed signal compressed to a length; and a sample number conversion circuit that replaces the left and right ends of the high-definition signal with the horizontally compressed signal so that the images are continuous, and supplies the horizontally compressed signal to the scan conversion circuit, and converts the video signal 1. A high-definition image reproducing apparatus comprising: a signal switching circuit that replaces left and right end portions of the horizontally compressed signal with a signal obtained by thinning out the number of scanning lines of the horizontally compressed signal.