JPH0514931A - Transmitting device and reproducing device for television signal - Google Patents

Abstract

PURPOSE:To obtain a wide picture by respectively executing an NTSC system-processing and time devision multiplexing to the signals of a center part and side part in the wide picture to transmit them by means of multiplexing to the orthogonal component of carrier wave, picking-up the main signal and multiplexed signal and executing specified demodulation and connection. CONSTITUTION:A specified scanning line number, an interlace ratio and the RGB signal from the wide camera 101 of the aspect ratio are converted into Y, I and Q signals by a matrix converter 105. A signal separating circuit 11 separates the IQ signal and the high frequency range signal Yh of the Y signal in the center part and the low frequency range signal Ys1 of the Y signal in the side part, IQ signals Is, Qs and the high frequency range signal Ysh of a luminance signal in the side part from the video signal of the wide picture signal. An NTSC signal processing circuit 12 executes the processing of the signals I, Q, and Yh in the center pannel part and the signal Ysh in the side part. A multiplexer 13 time division-multiplexes the signals Is, Qs and Ysh and an orthogonal modulation circuit 14 modulates them by the orthogonal component of carrier wave so as to transmit them. A reproducing device takes out the main signal and the multiplexed signal by synchronization detection, demodulates the signals Y, I and Q in the side parts and connects them to the signal in the center part so as to output the picture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television signal transmitting apparatus and a reproducing apparatus, and more particularly to a second generation EDTV (Extended) compatible with the current television system.
The present invention relates to a television signal transmission device and a reproduction device in a Definition TV).

[0002]

2. Description of the Related Art Conventionally, as a method for transmitting a video signal having an aspect ratio larger than 4: 3 while maintaining compatibility with the NTSC system, the upper and lower sides of an NTSC image are made black and a high-frequency signal which is vertical / horizontal to the black area. Or a side panel that decomposes the signals of the center and side parts of a wide aspect image and multiplexes the signals of both side parts into vertical and horizontal blanking periods and orthogonal components of the video carrier. A method and an intermediate method between them have been proposed.

[0003]

As described above, NTSC
In the letterbox method, in which the upper and lower parts of the image are blackened and various signals such as high frequency signals are multiplexed and transmitted in that area, the current N
When played back on a TSC receiver, black appears at the top and bottom of the screen and is unsightly.

On the other hand, the center part and the side part of a wide image are decomposed, the low range of the Y signal of the side part is multiplexed to the horizontal overscan part, and the high range of the Y signal of the side part and the IQ signal are divided. In the side panel method in which the signals are multiplexed and transmitted in the three-dimensional hall, DC-1.5M for the I signal in the three-dimensional hall
Since a signal including a low frequency band of DC to 0.5 MHz is multiplexed for the Hz and Q signals, there is a problem that the interference of cross color and cross luminance given to the current NTSC receiver is large.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a wide image television signal transmission apparatus compatible with the current television system, in which a wide image video signal and a center image are transmitted. An image dividing means for dividing the side portion into a side image video signal, a time division multiplexing means for time division multiplexing the YIQ signals of both side portions of the wide image, and a YIQ time division multiplexed by the time division multiplexing means.
A configuration is provided in which a quadrature modulation unit that multiplexes a signal into a quadrature component of a video carrier of a video signal in the center portion of the wide image and a transmission unit that transmits a modulation signal derived from the quadrature modulation unit at a predetermined frequency are provided. To do.

Further, a wide image video signal is divided into a center image and a side image video signal, the center image video signal is subjected to NTSC processing, and the side image video signals Y, I and Q are time-division multiplexed. Then, in a television signal reproducing apparatus for receiving and reproducing a wide image television signal compatible with the NTSC system, which is multiplexed on the orthogonal component of the image carrier of the image signal of the center image, the center of the television signal is received from the received television signal. First synchronous detection means for synchronously detecting a video signal of an image to extract a main signal;
Second synchronous detection means for synchronously detecting the video signal of the side image multiplexed on the quadrature component of the video carrier to take out a multiplexed signal, and demodulation means for demodulating the video signals Y, I, Q of the side images time-divided. The video signal of the side image demodulated by the demodulating means is connected to the video signal of the center image, and the splicer means is provided, and the signal processing means for displaying the combined video signal as a wide image is provided.

[0007]

With the above-described structure, in the television signal transmission device, the wide image is divided into the center part and the side part video signal, and the center part video signal is NTSC.
The side video signal YIQ is time-division multiplexed and then multiplexed on the orthogonal component of the video carrier of the center video signal to transmit a wide image television signal compatible with the NTSC system. .

In a television signal reproducing apparatus,
The television signal transmitted from the transmission device is received, the main signal and the multiple signal are extracted by the synchronous detection, and the side image signals Y, I and Q are demodulated from the multiple signal and a part of the main signal. A wide image is displayed by connecting the demodulated video signals Y, I, and Q of the side portion to the video signal of the center portion by a splicer.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the essential parts of an embodiment of the transmitting side of the present invention. In FIG. 1, 101 is 525 scanning lines, interlace ratio is 2: 1 and aspect ratio is 1
6: 9 wide camera, 105 is the wide camera 10
A matrix converter for converting RGB signals from 1 into Y, I, and Q signals; 11 is an IQ signal in the center portion from a video signal of a wide image, a high-frequency signal Yh of the Y signal, and Y in the side portion.
Signal low frequency signal Ysl and side IQ signals Is, Q
Reference numeral 12 denotes an NTSC signal processing circuit for performing signal processing on the I, Q, Yh signals of the center panel section and the Ysh signal of the side section according to the NTSC system.

On the other hand, 13 is the above Is, Qs,
A multiplexer for time-division-multiplexing the Ysh signal, 14 is a quadrature modulation circuit for modulating the time-division-multiplexed side signal with a quadrature component of a video carrier, and 15 is a transmission for converting the output of the quadrature modulation circuit 14 into a predetermined signal for transmission. The circuit, 16 is an output terminal.

FIG. 2 is a block diagram showing details of an embodiment of the transmitting side of the present invention. The same parts as those in FIG. In FIG. 2, 102, 103,
Reference numeral 104 is an analog / digital (hereinafter referred to as A / D) converter for RGB signals, and 106 and 107 are horizontal low-pass filters (hereinafter referred to as HL) for I and Q signals, respectively.
PF), 108 and 109 are HL for the Y signal.
PFs, 110, 111, 112 are time-axis expansion circuits for expanding the outputs from the H-LPFs 106, 107, 108 on a time axis, and 113 is the H-LPF 10.
9 is a time axis compression circuit that time-axis compresses the output from 9.

Reference numeral 114 is an IQ modulator for quadrature modulating the I and Q signals with color subcarriers, 115 is an adder for adding the luminance signals from the time base expansion circuit 112 and the time base compression circuit 113, and 116 is the IQ modulator. An adder 117 for adding both outputs of 114 and an adder 115 is a digital / analog (hereinafter referred to as D / A) converter for converting the output of the adder 116 into an analog signal.

On the other hand, 118 and 119 are H-LPs, respectively.
A time axis expansion circuit for expanding the Is and Qs signals on the time axis through F106 and 107, 120 is a horizontal band pass filter (hereinafter referred to as H-BPF) of the Ysh signal which is a high frequency signal of the Y signal in the side portion, 121, Reference numeral 122 is a modulator for frequency shifting Is and Iq signals whose time axes are expanded by the time axis expanding circuits 118 and 119 by fsc / 7, and 123 is the above H
A time axis expansion circuit for expanding the Ysh signal passed through the BPF 120 on the time axis, and 124 and 125 respectively represent the modulator 1 described above.
H-BPF 126 for band limiting the outputs of 21 and 122
Is H- for band limiting the output of the time axis expansion circuit 123.
LPF.

127 is an Is-Qs multiplexer that multiplexes the Is and Qs signals from the H-BPFs 124 and 125, 128 is a multiplexer that multiplexes the output of the Is-Qs multiplexer and the output of the H-LPF 126, and 129 is The multiplexer 12
8 is a D / A converter that performs D / A conversion on the output of 8.

Reference numeral 131 is an intermediate frequency (38.9 MHz) generation circuit, and 130 is an NTSC from the D / A converter 117.
System television signal to the intermediate frequency generating circuit 13
IF modulator for modulating with the signal from 1, 132 is the above D /
The output of the A converter 129 is used as the intermediate frequency generation circuit 131.
1 is a quadrature modulator for modulating a carrier wave orthogonal to the IF modulator 130 in FIG. 1, 133 is a VSB (residual waveband) filter, 134 is an inverse Nyquist filter, 135 is an adder, and 136 is an up converter.

The embodiment of the transmitting side of the present invention has the above configuration, and its operation will be described below. Number of scanning lines 525 /
The RGB signals output from the wide camera 101 with the interlace ratio 2: 1 / aspect ratio 16: 9 are converted into digital signals by the A / D converters 102 to 104, and further converted into the luminance signal Y by the matrix converter 105 in the next stage. The color signal IQ is converted. The above YIQ signals are H-LPF1
06 ~ 109, Y signal is DC ~ 5.0MHz Y
The h signal and the Ysl signal of DC to 0.84 MHz are frequency-separated, and the I signal is an Is signal of DC to 1.5 MHz and a Q signal.
The signal is band limited to a Qs signal from DC to 0.5 MHz.

The above-mentioned Yh signal is the time axis expansion circuit 11 of the next stage.
2, the center portion 2 of the original image 1 is expanded by 4/3 times in the time axis as shown in 3, and the Ysl signal in the side portion is expanded by the time axis compression circuit 113 in FIG.
4 to 5, the side portion 4 of the original image 1 is compressed to ⅕ as shown in 5. Ysl signal 5 after compression
Is arranged in the horizontal overscan portion of the video signal, and is added to the Yh signal 3 after the expansion in the adder 115,
The signal becomes 6 as shown in FIG.

Next, the center portions of the I signal and the Q signal are similar to the center portion of the Y signal, and are denoted by 22 to 23 and 32 to 32 in FIG.
As shown in 33, the center parts 22, 3 of the original images 21, 31
2 is expanded 4/3 times by the time axis expansion circuits 110 and 111 to become as shown at 23 and 33 in FIG. The IQ signals 23 and 33 in the center portion after the expansion are the IQ modulator 1
14 and the IQ modulator 114 quadrature modulates the IQ signal with a color subcarrier of 3.58 MHz. The quadrature-modulated IQ modulated signal is added to the output signal (Yh + Ysl) from the adder 115 in the adder 116,
N is converted to an analog signal by the D / A converter 117.
Form a TSC signal. And this NTSC signal is
The IF modulator 130 performs IF modulation with the 38.9 MHz wave from the intermediate frequency generation circuit 131, and the residual band wave is removed by the VSB filter to derive an IF modulated signal.

On the other hand, the IQ signal on the screen side, that is, Is,
The high frequency signal Ysh of the Qs signal and the Y signal is signal-processed so that it can be transmitted by the orthogonal component of the video carrier. That is, after the high frequency signal Ysh of the Y signal in the side part is band-limited to 0.84 MHz to 5.0 MHz by the H-BPF 120,
As shown at 4 and 7 in FIG. 3, the side portion 4 of the original image 1 is expanded four times by the time axis expander 123, and becomes as shown at 7 in FIG. Further, the expansion signal 7 of the Ysh signal is HL
After being limited to the band of DC to 1.25 MHz by the PF 126, it is input to the multiplexer 128.

The color signals Is and Qs of the side portion are shown in FIG.
24, 25, 34, 35 of the original picture 21, 31
The side parts 24 and 34 of the time axis expansion circuits 118 and 119 are
It is doubled and becomes as shown in 25 and 35. Here, Is is DC to 0.75 MH in the frequency spectrum.
z and Qs are DC to 0.25 MHz. The expansion signals 25 and 35 of the time axis expanders 118 and 119 are frequency-shifted by the carrier wave of fsc / 7 in the modulation circuits 121 and 122 of the next stage, and the color signal Is of the side portion is 0.51 by the H-BPFs 124 and 125. .About.1.25 MHz, the side color signal Qs is limited to a band of 0.51 to 0.76 MHz.

The color signals Is and Qs of the side portion are, for example, the left side portion of the Is signal / the left side portion of the Qs signal / the right side portion of the Is signal / Qs signal in each horizontal scanning period as shown by 36 in FIG. Are multiplexed by the multiplexer 127 so as to be arranged in order on the right side of. Further, the multiplexed side IQ signal is sent to the multiplexer 128 in the side high Y signal Ys.
They are arranged alternately with h and line by line, and are converted into analog signals by the D / A converter 129.

In the IF quadrature modulator 132, the IF side 1 multiplex signal of the side image thus formed is formed.
It is modulated with a carrier orthogonal to 30. Then, this quadrature modulation signal is limited to the band shown in FIG. 8 by the inverse Nyquist filter 134, then multiplexed with the modulation signal from the IF modulator 130 in the adder 135, raised by the up converter 136 to a predetermined frequency and transmitted. To be done.

Next, one embodiment of the receiving side of the present invention is shown in FIG.
This will be described with reference to FIGS. 6 and 7. FIG. 5 is a block diagram showing the essential parts of an embodiment of the receiving side of the present invention. In FIG. 5, reference numeral 51 is a synchronous detection circuit for detecting a main signal and a multiplexed signal from the transmitted television signal by orthogonal carrier waves respectively, and 505 is a Y / C separation circuit for separating the main signal into a luminance signal and a chroma signal. Reference numeral 506 is an IQ demodulation circuit for demodulating an IQ signal from a chroma signal, and 52 and 509 are time axis compression circuits for compressing the time axis of the Yh, I, Q signals at the center after demodulation by 4/3.

Reference numeral 510 is a low-frequency signal Ys of the Y signal of the side portion.
a time axis expansion circuit for expanding the time axis of 1 to 5 times, 54 a signal processing circuit for deriving the side chroma signal Cs and the high-frequency luminance signal Ysh from the multiplex signal, 55 a demodulation circuit for the chroma signal Cs, Reference numeral 519 denotes a time axis compression circuit that compresses the time axis of the high-frequency luminance signal Ysh of the side portion four times, 52
2 is an adder for adding the Ysh signal from the time axis compression circuit 519 and the band-limited signal of the Ysl signal from the time axis expansion circuit 510, and 53 is the I, Q and Yh signals of the center portion and the side portion. Is, Qs and Ysl + Ysh
It is a splicer that connects signals.

FIG. 6 is a block diagram showing a detailed configuration of a signal separation circuit in the preceding stage for separating a multiplexed signal in the reproducing apparatus of the present invention shown in FIG. 5, and 411 is an intermediate circuit of the received television RF signal. A down converter for converting to a frequency (IF) signal, 412 is a Nyquist filter for band limiting the main signal, 413 is a synchronous detection circuit, and 414 is 6
MHz H-LPF, 415 is the synchronous detection circuit 413.
And a synchronous detection circuit 416 for reproducing a multiplexed signal with carrier waves whose phases are different by 90 degrees, and 416 is an H-LPF of 1.25 MHz.

Therefore, the television RF signal obtained through the antenna is converted into an intermediate frequency (IF) signal by the down converter 411, the main signal is band-limited by the Nyquist filter 412, and then the synchronous detection circuit 41.
It is detected by 3. On the other hand, the multiplexed signal is detected by the synchronous detection circuit 4
At 15, the carrier wave having a 90-degree phase difference from the synchronous detection circuit 413 is reproduced. Each signal is H-
LPF414 (6 MHz LPF) and 416 (1.25
The band is limited by the MHz LPF), and the signal is output from the output terminals 417 and 418 as a main signal output and a multiple signal output.

In the circuit shown in FIG. 6, the television RF is used.
The main signal and the multiplexed signal extracted from the signal are reproduced by the processing circuit shown in FIG. 7 to derive the YIQ signal. In FIG. 7, 501 and 502 are input terminals for the main signal and the multiplexed signal, respectively, and 503 and 504 are A / D converters for converting the main signal and the multiplexed signal into digital signals.

Reference numeral 505 is a Y / C separation circuit for separating the main signal into a luminance signal and a chroma signal, and 506 is an IQ from the chroma signal.
IQ demodulation circuits 507, 508 and 50 for demodulating signals
Reference numeral 9 is a time axis compression circuit for compressing the time axis of the IQYh signal at the center after demodulation to 4/3 times, and 511 is an H-LPF for limiting the time axis expanded Ysl signal to the band of DC to 0.84 MHz. Is.

Reference numeral 512 denotes Y from the A / D converted multiple signal.
Signal high frequency signal Ysh and side IQ signals Is, Qs
Line dividing circuit 513 for reproducing the signal
Demultiplexers 514, 515, 5 for reproducing signals
Reference numeral 16 is a vertical expansion circuit for vertically expanding the Is, Qs and Ysh signals, and 517 and 518 are demodulators 519 and 52 for demodulating the Is and Qs signals into signals including low frequency components.
0 and 521 quadruple the time axis of the Ysh signal, Is,
A time axis compression circuit that doubles the time axis of the Qs signal, 5
22 indicates the Ysh signal from the time axis compression circuit 519 as the above H
An adder for adding the low frequency signal Ysl of the Y signal from the LPF 511.

Reference numerals 523, 524 and 525 denote I, Q and Yh signals of the center portion and Is and Qs of the side portion, respectively.
And a splicer that connects Ysl + Ysh,
526, 527 and 528 are the splicers 52 described above.
D / A converters 529, 530 and 531 for converting the outputs of 3, 524 and 525 into analog signals are output terminals for I, Q and Y signals, respectively.

Therefore, the main signal is converted into a digital signal by the A / D converter 503, and the center signal is Y / C.
The separation circuit 505 separates the Y signal and the chroma signal, and the chroma signal is further demodulated into the I signal and the Q signal by the IQ demodulation circuit 506. The I, Q and Yh signals of the center section after demodulation are compressed 4/3 times by the time axis compression circuits 507, 508 and 509, and the Y section of the side section multiplexed in the horizontal overscan section of the video signal. The low-frequency signal Ysl of the signal is expanded five times by the time axis expansion circuit 510 and then DC-0.8 by the H-LPF 511.
Limited to the 4 MHz band.

On the other hand, the multiplexed signal is converted into a digital signal by the A / D converter 504, and the line division circuit 51 at the next stage.
2 reproduces the high-frequency signals Ysh, Is, and Qs signals of the Y signal of the side portion alternately arranged for each line, and further, the demultiplexer 513 divides the Is signal and the Qs signal of the side portion divided and arranged in the horizontal period. Reproduce. I of the side part
The s, Qs, and Ysh signals are vertically expanded circuits 514 and 515.
And 516, the IQ signal is expanded and the IQ signal is demodulated by the demodulator 51.
In 518 and 518, the frequency is shifted with the carrier wave of fsc / 7 and demodulated into a signal including a low frequency component.

The high frequency signals Ysh, Is and Qs of the side Y signal after the demodulation are the time axis compression circuit 519,
The Ysh signal is quadrupled by 520 and 521, and Is, Q
The s signal is compressed twice, and the Ysh signal is added by the adder 522 to the low frequency signal Ysl of the Y signal of the side portion.

Next, Is, Qs and Ys of the above side portion
The l + Ysh signal is connected to the above-mentioned I, Q and Yh signals of the center portion in the splicers 523, 524 and 525, then converted into an analog signal by the D / A converters 526, 527 and 528, and output terminals 529, 5
Reproduced and output as I signal, Q signal and Y signal from 30 and 531 respectively. The Y, I, and Q signals reproduced in the above-described manner are well-known video processing circuits (not shown).
Is converted into an RGB signal and then displayed on a display device.

The characteristics, compression / expansion coefficient, etc. of the various filters described above are merely examples, and are not necessarily limited to the above numerical values.

[0036]

Since the present invention has the above-mentioned structure, the NTS
It becomes possible to transmit a wide aspect image within the NTSC transmission band while maintaining compatibility with the C system, and when reproduced on the current NTSC system television receiver, the current aspect ratio image is 4: 3. It can be projected, and the aspect ratio is 1 when played back on a dedicated wide-screen receiver.
A wide image of 6: 9 can be displayed. In addition, since the side image is time-division multiplexed and transmitted by the orthogonal component of the video carrier, no interference such as cross color or cross luminance to the existing television receiver occurs.
In addition, the YIQ signal in the side portion can be easily separated when the image is reproduced by a dedicated receiver.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of an embodiment of a transmitting side of the present invention.

FIG. 2 is a block diagram showing details of an embodiment of a transmission side of the present invention.

FIG. 3 is an operation explanatory diagram showing a processing state of a Y signal used in the present invention.

FIG. 4 is an operation explanatory diagram showing a processing state of an IQ signal used in the present invention.

FIG. 5 is a block diagram showing the main part of the overall configuration of an embodiment on the receiving side of the present invention.

FIG. 6 is a block diagram of an embodiment of a signal separation circuit on the receiving side of the present invention.

FIG. 7 is a block diagram of an embodiment of a signal processing circuit for a main signal and a multiplexed signal on the receiving side of the present invention.

FIG. 8 is a characteristic diagram of an inverse Nyquist filter used in the present invention.

[Explanation of symbols]

106, 107, 108, 109 H-LPF 127, 128 multiplexer 130 IF modulator 132 Quadrature modulator 136 upconverter 413, 415 Synchronous detection circuit 523, 524, 525 splicer

Claims (2)

[Claims] 1. In a television signal transmission device for wide image compatible with the current television system, an image dividing means for dividing the video signal of the wide image into a center image and side image signals of both side portions. , Time division multiplexing means for time division multiplexing the YIQ signals on both sides of the wide image, and YI signals time division multiplexed by the time division multiplexing means.
There is provided quadrature modulation means for multiplexing the Q signal on the quadrature component of the video carrier of the video signal in the center part of the wide image, and transmission means for transmitting the modulation signal derived from the quadrature modulation means at a predetermined frequency. A transmission device of a television signal characterized by. 2. A wide image video signal is divided into a center image and a side image video signal, the center image video signal is subjected to NTSC processing, and the side image video signals Y, I and Q are time-division multiplexed. In a television signal reproducing apparatus for receiving and reproducing a wide-image television signal compatible with the NTSC system, which is compatible with the NTSC system, which is multiplexed on the orthogonal component of the image carrier of the image signal of the center image, a center image is received from the received television signal. And a second synchronous detection means for synchronously detecting the video signal of (1) and extracting the main signal, and a synchronous detection means for synchronously detecting the video signal of the side image multiplexed on the orthogonal component of the video carrier and extracting the multiplexed signal. A demodulation means for demodulating the time-divided side image video signals Y, I, and Q, and a side image video signal demodulated by the demodulation means as a center image And a signal processing unit for projecting the combined video signal into a wide image, the reproducing apparatus for a television signal.