JPH0775068A - Transmitting device for wide television signal - Google Patents

Abstract

PURPOSE:To transmit a wide television signal with a high picture quality while compatibility is held with a conventional television signal. CONSTITUTION:A signal generated from a successive scanning wide television signal source 101 is letter box-converted by a 4-3 converter 103. Then, a main picture component one field before whose level of correlation seems to be high generated by using a field memory 116 is subtracted from an animation reinforcement signal outputted from a succession/jumping converter 111 by subtracter 112, so that a signal component is decreased, and a signal can be multiplexed on the upper and lower black parts and transmitted. At a reception side, the signal is received, and the main picture component whose level of correlation is high is added, so that the animation reinforcement signal is reproduced, and the original successive scanning wide television signal can be reproduced and displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a high image quality and a high aspect ratio as compared with the current television while maintaining compatibility with the current television broadcasting within the transmission band used in the current television broadcasting. The present invention relates to a wide television signal transmission device capable of transmitting an image having a large ratio.

[0002]

2. Description of the Related Art Current Japanese color television broadcasting has various specifications such as 525 scanning lines, 2: 1 interlaced scanning, luminance signal horizontal bandwidth 4.2 MHz, and aspect ratio 4: 3. More than 30 years have passed since it started in 1960. Meanwhile, with the demand for high-definition screens and the improved performance of television receivers,
Various new television systems have been proposed.

Against this background, a wide television signal broadcasting system has been proposed which is compatible with the current broadcasting and has a wide screen. One of them is Figure 5.
As shown in (a), it is known as a so-called letter box method, and the effective scanning line number is compressed from 480 to 360 lines per frame, and black portions at the top and bottom (hereinafter referred to as a non-image portion). Leave. By doing this,
Although the aspect ratio is 16: 9, since the vertical resolution is lowered, the vertical reinforcement signal is transmitted in the non-image part to correct this.

When a signal source using 1: 1 sequential scanning is used as a signal source, a scanning line difference signal generated when converting to 2: 1 interlaced scanning is used as a moving image reinforcement signal. Is also considered to be transmitted in the upper and lower non-image parts. FIG. 5 illustrates this sequential-interlace conversion.
It is (b). Here, two signals that have been passed through a 5-tap vertical low-pass filter with coefficients -1/8, 1/4, 3/4, 1/4, and -1/8 from the original signal of progressive scanning are used. It is transmitted as the main screen by thinning out one of the two, and two signals are obtained by passing the original signal through a 3-tap vertical high-pass filter with coefficients -1/4, 1/2, and -1/4. Then, the thinned one is transmitted as a scanning line difference signal. As shown in the figure, the scanning lines selected by the main screen signal and the scanning line difference signal are staggered.

[0005]

In such a wide television signal transmission apparatus, the moving image reinforcement signal is 1:
One of the two scanning lines is selected from one sequential scanning signal and is generated from the scanning lines that are not transmitted. For the scanning lines that are not transmitted, the upper and lower non-image portions are used as scanning line difference signals, and 360 lines are transmitted per frame. If the scanning line difference signal is multiplexed as it is to the upper and lower non-image parts, the flicker that becomes an interference when viewed with a current receiver becomes remarkable. Therefore, it is necessary to provide some kind of restriction such as amplitude limitation without reducing the effect of the moving image reinforcement signal as much as possible.

The present invention has been made in view of the above problems, and while maintaining compatibility with current television broadcasting,
It is an object of the present invention to provide a wide television signal transmission device in which interference in a current receiver due to a moving image reinforcement signal transmitted in a non-picture portion is minimized.

[0007]

In order to solve the above problems, the wide television signal transmission apparatus of the present invention comprises:
From the signals between scanning lines which are multiplexed in the upper and lower non-image areas, a component having a high correlation with the signal between scanning lines is extracted as a correction signal from the signals transmitted in the main screen portion one field before, and this correction is performed. By subtracting the signal from the scanning line difference signal, the interference between the upper and lower non-image areas when received by the current receiver is reduced.

[0008]

According to the present invention, by subtracting the correction signal from the scanning line difference signal, the correlation between the scanning line difference signals is high in the portion close to the still image, so that the amplitude of the scanning line difference signal is reduced and the difference between the current receiver and the current receiver is reduced. Interference is reduced. In the part close to the moving image, it may increase on the contrary, but it is rare. In this way, it is possible to transmit a wide screen with high image quality while maintaining the format of the conventional system of 525 scanning lines, 2: 1 interlaced scanning, and luminance signal horizontal bandwidth of 4.2 MHz. Further, it is possible to visually reduce the influence of the interference of the non-image part when received by the current receiver, and to multiplex-transmit the moving image reinforcement signal composed of the scanning line difference signal.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A wide television signal transmission apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a transmitting side in one embodiment of a wide television signal transmitting apparatus of the present invention. The wide television signal source 101 outputs a luminance signal Y and color difference signals I and Q having an aspect ratio of 16: 9 by progressive scanning with 525 scanning lines (the number of effective scanning lines is 480). The vertical LPF (low pass filter = low pass filter) 102 is for limiting the vertical resolution to 360 TV lines or less in order to prevent aliasing before converting the effective scanning lines from 480 lines to 360 lines. Next, this output signal is input to the 4-3 converter 103, and the number of scanning lines is converted from 480 to 360.

The vertical reinforcement signal VH is generated in order to correct the vertical resolution lost by such letterbox processing. The vertical HPF 104 extracts vertical high frequency components (components from 360 TV lines to 480 TV lines) of the luminance signal. Further, the 4-3 converter 105 converts 480 scanning lines into 360 without losing information. This vertical high-frequency component is sequentially processed by the interlace converter 106 to 360.
The number of scanning lines is converted to 180.

Next, the vertical reinforcement signal is applied to the horizontal LPF 10.
The horizontal band is limited to 1.4MHz at 7, and further 15Hz
It is modulated at 15 Hz by the z modulator 108. This modulator is equivalent to inverting the signal every frame. This modulation processing is then performed as a pre-processing for adding this signal to the moving image reinforcing signal, and has the purpose of facilitating the separation of both signals on the receiving side.

On the other hand, the luminance signal of the output signals of the 4-3 converter 103 converted into 360 lines is input to the vertical LPF 109 and the vertical HPF 110. First, the signal path forming the main screen will be described.

The vertical LPF 109 is mainly intended to reduce flicker when the main screen is viewed by an existing receiver. Examples of the vertical LPF 109 include -1/8, 1/4, 3
It may be a 5-tap of / 4, 1/4, or -1/8. The sequential-interlacing converter 115 is for converting a sequential scanning signal into an interlaced scanning signal, and thins out 180 scanning lines from 360 scanning lines and extracts them. In this way, the output of the sequential-to-interlace converter 115 is 1 per field in the main screen section.
It will be 80. Of the output signals of the 4-3 converter 103,
The color difference signals are thinned out by the sequential-interlace converter 114 from the 360 scanning lines to 180 scanning lines and output. The output of the sequential-interlace converter 114 and the output of the sequential-interlace converter 115 are input to the NTSC encoder 122, and the luminance signal Y and the color difference signals I and Q are combined to generate an NTSC signal. Next, the moving image reinforcement signal is obtained as a vertical high frequency component in the vertical HPF 110. The coefficients of the vertical HPF 110 may be three taps of -1/4, 1/2, and -1/4. Furthermore, the sequence-to-interlace converter 111
By thinning out 180 scanning lines from 360 scanning lines and outputting them, the signal component is converted into a vertical low band.

The main object of the present invention is to generate a correction signal to be subtracted from the moving image reinforcement signal as follows. Sequentially-
The 180 interlace scanning signals of the main screen section output from the interlace converter 115 are delayed by one field time by the field memory 116. The vertical HPF 117 aims to extract a component having a correlation with the moving image reinforcement signal. This filter has coefficients of -1/4, 1/2, -1/4
A simple tap configuration is also acceptable. This output is input to the gain adjuster 118, and usually has a different gain value depending on whether the input signal is positive or negative. For example, it may be positive 1/3 and negative 1/6. This value is related to the gain of the vertical HPF 110 and depends on the amplitude of the moving image reinforcing signal. The output of the gain adjuster 118 becomes the correction signal. Finally, the subtractor 11
In 2, the correction signal is subtracted from the moving image reinforcement signal output from the sequential-interlace converter 111.

The corrected moving image reinforcement signal is the horizontal LPF 11
At 3, the horizontal band is limited to 1.4 MHz. Finally, the adder 119 adds the vertical reinforcement signal and the rearrangement processing circuit 120 compresses the time axis to ⅓, and at the same time, rearranges the upper and lower non-image portions. 180 per field
The number of book signals is reduced to 60 by this processing. This multiplexed signal is modulated by the modulator 121 with the color subcarrier fsc.

Finally, the vertical and video enhancement signals modulated by 60 lines per field and the NTSC encoder 12
The main screen signal from 2 is combined by the combiner 123. In the synthesizer 123, N is used during the period of 180 letterboxes.
The NTSC-encoded main signal from the TSC encoder 122 is combined by switching between a moving image reinforcement signal and a vertical reinforcement signal in the upper and lower non-picture areas. The output of the synthesizer 123 is modulated by the video carrier modulator 124 in the same manner as a normal NTSC signal and transmitted.

FIG. 2 is a block diagram of the transmitting side in another embodiment of the wide television signal transmitting apparatus of the present invention. Hereinafter, description will be given with reference to the drawings.

This encoder is characterized in that the subtraction processing unit for the correction signal of the moving image reinforcement signal is located immediately before the video carrier modulator, and the other blocks are the same as the encoder shown in FIG. Only the parts different from FIG. 1 will be described below.

The video enhancement signal without subtracting the vertical enhancement signal and the correction signal is added by the adder 113, the time axis is compressed to ⅓ in the reordering circuit 120, and reordered into the upper and lower non-image parts. This multiplexed signal is not modulated and is combined by the combiner 12
In 3, it is combined with the main screen signal.

Next, the reinforcement signal separator 126 separates the main screen and the non-picture part. From the main screen, a field memory 127, a vertical HPF 128, a gain adjuster 129, a horizontal LPF 130, and a rearrangement processing circuit 131 are used to generate a correction signal. These operations are the same as explained in FIG. Next, the correction signal generated in this way is subtracted from the multiplexed signal of the non-picture part separated by the subtractor 132, modulated by the color subcarrier by the modulator 133, and again by the combiner 134 to the main screen. Is synthesized.

Generally, in the studio of the current broadcasting station, processing is performed in field units. On the other hand, the moving image reinforcement signal from which the correction signal is subtracted is not suitable for the processing in the studio because it is processed across fields. Therefore, it is convenient to position the processing in the studio between the synthesizer 123 and the reinforcing signal separator 126 by performing the processing in the above-described order. That is, since the processing is performed over the fields below the reinforcing signal separator 126 before inputting to the video carrier modulator 124, it has a feature that it is extremely convenient in operation considering processing such as scene cut. There is.

FIG. 3 is a block diagram of the receiving side in an embodiment of the wide television signal transmitting apparatus of the present invention. Hereinafter, description will be made in order according to the drawings.

The wide television signal encoded on the transmitting side is received by the antenna 300, and the tuner 3 is received.
The baseband signal passing through 01 and demodulated by the video carrier demodulator 302 is input to the reinforcement signal separator 303.
In this separator, 180 scanning lines per field, which is the main screen arranged in the center of the screen, and 60 reinforcing signal portions per field, which are multiplexed in the upper and lower non-picture areas, are separated. The main screen unit having 180 scanning lines separated by the reinforcement signal separator 303 is delayed by one field time by the field memory 304. Vertical H
The PF 305 is the vertical HPF 117 shown in FIG.
Use a filter with the same characteristics as. Next, the gain adjuster 306 adjusts the gain of the correction signal.

Further, the horizontal LPF 307 provides 1.4M.
The band is limited to Hz or less, the time axis is compressed to 1/3 by the rearrangement processing circuit 308, and then the upper and lower non-image areas are rearranged. This is the correction signal subtracted from the moving image reinforcement signal on the transmission side.

The non-picture part signal separated by the reinforcement signal separator 303 is demodulated by the demodulator 327 and then added with the correction signal by the adder 309 to restore and output the original moving image reinforcement signal. The synthesizer 310 synthesizes the upper and lower non-image parts and the main screen of the central part into the original signal.

The output of the combiner 310 is the reinforcement signal separator 31.
1 and the reinforcement signal separator 311 separates the vertical reinforcement signal VH, the moving image reinforcement signal LD and the main screen and outputs them. The output signal including the main screen is input to the NTSC decoder 314 and separated into a luminance signal Y and color difference signals I and Q. On the other hand, the vertical reinforcement signal is input to the rearrangement processing circuit 313, and the time axis is tripled and simultaneously arranged at the position of the main screen. Further, the rearranged signals have a horizontal band of 1.4 MHz by the horizontal LPF 316.
Limited to: Further, the vertical reinforcement signal is vertically expanded by the 3-8 scan line converter 318 and converted into 480 scan lines.

The separated moving image reinforcement signal is arranged at the position of the main screen at the same time when the time axis is tripled by the rearrangement processing circuit 312. This video reinforcement signal is a horizontal LP
After the band is limited to 1.4 MHz by F315, 0
It is input to the insertion circuit 322 and the vertical HPF 326. The coefficients of this vertical HPF are -1/4, -1/2, 3/2,-
It may be one with 5 taps of 1/2 and -1/4.

On the other hand, the main screen signal is input to the 0 insertion circuit 321 and the vertical LPF 325, and then added to the moving image reinforcement signal in the combiner 320. This vertical LPF has a coefficient of 1/2,
It may be a three-tap of 1, 1/2.

This series of processing is conversion from interlaced signals to sequential signals. As a result, a progressive scan signal having a band of 360 TV lines was restored. However, this is for the luminance signal up to 1.4 MHz, and for the luminance signal and the color difference signal in the band higher than that, there is no moving image reinforcement signal, so it is not possible to completely restore the original progressive scanning signal. Can not.

The original 360 progressive scanning signals thus reproduced are converted into scanning lines by the 3-4 scanning line converter 319 to reproduce 480 progressive scanning wide television signals. . The vertical reinforcement signal, which is the output of the 3-8 scan line converter 318, is supplied to the combiner 320.
It functions to add components from 60 TV lines to 480 TV lines to the main signal. Finally, the image is displayed by being supplied to the display device 328.

FIG. 4 is a block diagram of the receiving side in another embodiment of the wide television signal transmitting apparatus of the present invention. Unlike FIG. 3, this figure is characterized in that the correction block of the moving image reinforcement signal is located after the NTSC decoder, and the other block diagram is the same as FIG. With this configuration, the hardware scale can be reduced. Only the differences from FIG. 3 will be described below with reference to FIG. The signals of 180 scanning lines of the main screen section output from the NTSC decoder 314 are input to the field memory 304 and delayed by one field time, and further, the vertical HPF 305, the gain adjuster 306, and the horizontal LPF 307.
Be introduced to. This is the same processing as in the case of FIG.
The correction signal is not added to the positions of the upper and lower non-image parts, and is added by the adder 317 to the moving image reinforcement signal that has already been sorted to the main screen position.

0 insertion circuit 321 for jump-sequential conversion
With the vertical LPF 325, 1 of the transmitted main screen
Zeros are inserted into each of 80 scanning lines, and a predetermined vertical LP
F processing is performed. On the other hand, the corrected video enhancement signal is also subjected to 0 insertion for each scanning line by the 0 insertion circuit 322 and the vertical HPF 326, and a predetermined vertical HPF processing is performed. Both of these signals are added by the combiner 327 to become the original sequential signal.

The 3-4 scanning line converter 319 performs the so-called 3-4 conversion for converting the progressive scanning signals thus restored from 360 lines to 480 lines. Then, in the combiner 320, the output of the 3-4 scan line converter 319 and the 3
The vertical widening signal supplied from the −8 scan line converter 318 is added, and the original wide television signal having a vertical resolution of up to 480 TV lines is reproduced and displayed on the display device 328.

According to the structure of this embodiment, the correction signals are not rearranged, which has the advantage of simplifying the circuit.
It is convenient in terms of receiver construction. However, the configuration of the receiver is not limited to those described above, and it is sufficient that the receiver has a function of restoring the moving image reinforcement signal corrected for the purpose of reducing interference.

[0036]

As is clear from the above description, in the so-called letterbox wide television system that widens the screen while maintaining compatibility with the current television broadcasting system, the upper and lower non-image parts are not displayed. It is necessary to reduce the interference of the multiplexed signal to the existing receiver as much as possible. In the transmission device of the present invention, one field before the field enhancement can be performed without reducing the number of scanning lines or the amplitude of the required moving image reinforcement signal. By subtracting the correlated signal components transmitted on the main screen, the required video-enhancement signal is transmitted and received using the non-image areas at the top and bottom of the letterbox screen so that interference is minimized. On the side, this can be reproduced to restore the original progressive scan wide television signal. Further, according to the transmission device of the present invention, it is possible to transmit an excellent image even when a moving image is reproduced, such that flicker is reduced due to the effect of the moving image reinforcement signal.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a transmitting side of a wide television signal transmitting apparatus according to the present invention.

FIG. 2 is a block diagram of another embodiment of the transmission side of the wide television signal transmission apparatus of the present invention.

FIG. 3 is a block diagram of an embodiment of a receiving side of the wide television signal transmission apparatus of the present invention.

FIG. 4 is a block diagram of another embodiment of the receiving side of the wide television signal transmission apparatus of the present invention.

FIG. 5 shows a letter box method and a sequential method according to a conventional example.
Illustration of interlace conversion

[Explanation of symbols]

 101 Wide television signal source 106, 111, 114, 115 Sequential-to-interlace converter 112, 132 Subtractor 119, 113, 309, 317 Adder 123, 134, 310, 320, 330 Combiner 104, 110, 117, 128, 326 Vertical HPF 102, 109, 325 Vertical LPF 116, 127, 304 Field memory

Front page continued (72) Inventor Kiyoyuki Kawai 8 Shinsugita-cho, Isogo-ku, Yokohama, Kanagawa, Ltd. Toshiba Corporation (72) Inventor, Hideki Kinamata 14-2, Nibancho, Chiyoda-ku, Tokyo Nippon Television Network Co., Ltd.

Claims (14)

[Claims] 1. A transmission device for a wide television signal on a transmission side, wherein a wide television signal having an aspect ratio of 16: 9 is compatible with a current television signal standard having an aspect ratio of 4: 3. In order to transmit the data while inserting it, all the information of the wide television signal is inserted into approximately 3/4 of the central portion in the vertical direction of the screen, and the wide television is inserted into the upper and lower non-image portions of approximately 1/8 of the upper and lower portions of the screen. Among the information lost when converting the John signal from progressive scanning to interlaced scanning, the moving picture reinforcement signal consisting of the scanning line difference signal or the vertical resolution reinforcement signal or both are multiplexed, and this is correlated with the upper and lower non-picture part multiplexed signals. A wide television signal transmission device characterized in that a part of the wide television signal of one field before is included as a correction signal in advance. 2. A vertical band pass filter having a pass band around 180 TV lines is used by using a wide television interlaced scanning line signal having an aspect ratio of 16: 9 which is transmitted at approximately 3/4 of the vertical center of the screen. The extracted signal is used as a correction signal after a constant gain adjustment, and the upper and lower parts of the screen are each set to about 1
2. The wide television signal transmission device according to claim 1, wherein the transmission is performed on the non-picture portion multiplexed signal which is multiplexed and transmitted at the / 8 portion. 3. A wide television signal according to claim 2, wherein the coefficient of the vertical bandpass filter for generating the correction signal is made up of three taps of -1/4, 1/2 and -1/4. Transmission equipment. 4. The wide television according to claim 2, wherein the gain of the gain adjusting circuit for generating the correction signal is 1/3 when a positive signal is input and 1/6 when a negative signal is input. Signal transmission equipment. 5. The wide television according to claim 2, wherein the gain of the gain adjusting circuit for generating the correction signal is 1/2 when a positive signal is input and 1/4 when a negative signal is input. Signal transmission equipment. 6. The gain of a gain adjusting circuit for generating a correction signal is 3/8 when a positive signal is input and 3/16 when a negative signal is input.
3. The wide television signal transmission apparatus according to claim 2, wherein 7. A correction signal generated by using a wide television interlaced scanning line signal located at the center of the screen in the vertical direction has a horizontal band of 1.4 MHz which is the same as that of the non-picture part multiplexed signal.
2. The time-axis compression and rearrangement to a non-picture portion are performed, and then subtracted from the non-picture portion multiplexed signal that is multiplexed and transmitted in approximately 1/8 of the upper and lower portions of the screen. Wide television signal transmission device described. 8. A wide television signal transmission device on the receiving side, wherein a wide television signal having an aspect ratio of 16: 9 is provided in approximately 3/4 of the vertical center of the screen.
Of the information lost when the wide television signal is converted from the progressive scan to the interlace scan, approximately 1/8 of the upper and lower portions of the screen are transmitted in the central portion from the moving image reinforcement signal composed of the scanning line difference signal. Compensation subtracted from the wide television signal transmitted in the central part by receiving a signal compatible with the current system that includes the signal obtained by subtracting the correlation correction signal from the wide television signal one field before An apparatus for transmitting a wide television signal, comprising means for restoring a signal, and means for sequentially converting a wide television signal transmitted at a central portion in a vertical direction of a screen into a scanning signal. 9. A wide television interlaced scanning line signal having an aspect ratio of 16: 9 transmitted at approximately 3/4 of the vertical center of the screen is used, and this is delayed by one field to 180.
A signal extracted by a vertical bandpass filter having a pass band around the TV line is added to the non-picture part multiplexed signal which is multiplexed and transmitted in approximately 1/8 of the upper and lower parts of the screen after a certain gain adjustment. 9. A wide television signal transmission device according to claim 8. 10. A wide television signal according to claim 9, wherein the coefficient of the vertical bandpass filter for generating the correction signal is composed of three taps of -1/4, 1/2 and -1/4. Transmission equipment. 11. The gain of a gain adjusting circuit for generating a correction signal is 1/3 when a positive signal is input and 1/6 when a negative signal is input.
The wide television signal transmission apparatus according to claim 9, wherein 12. The gain of a gain adjusting circuit for generating a correction signal is 1/2 when a positive signal is input and 1/4 when a negative signal is input.
The wide television signal transmission apparatus according to claim 9, wherein 13. The gain of a gain adjusting circuit for generating a correction signal is 3/8 when a positive signal is input and 3/1 when a negative signal is input.
10. The wide television signal transmission device according to claim 9, wherein the transmission device is 6. 14. A correction signal generated by using a wide television interlaced scanning line signal located at the central portion of the screen in the vertical direction has a horizontal band of 1.4 MHz which is the same as that of a non-picture portion multiplexed signal.
9. The time-axis compression and rearrangement to the non-picture portion are applied to the non-picture portion multiplexed signal which is multiplexed and transmitted in approximately 1/8 of the upper and lower portions of the screen.
Wide television signal transmission device described.