KR920009073B1 - High definition tv system - Google Patents

Abstract

The system is for adding additive signal of one channel to NTSC signal while maintaining compatibility. It is composed of an encoding section and a decoding section. The encoding section includes a matrix section (20) for coverting the R,G,B signals from a camera (10) to Y,I,Q signal, 1st scan converter (30) for converting 1050 line signal to 525 line signal, 2nd scan converter (50), substrators (21-23) for substracting the output (Y,I,Q) of the 2nd scan converter (50) from the output (Y,I,Q) of the matrix section (20) respectively, a side panel rejector (60) for discriminating side panel signal and center portion of the signal, a time expansion/signal reproducing section (70), 1st, 2nd and 3rd NTSC encoders (80,90,130), 1st RF modulator (150) for quadrature-modulating the outputs of 2nd and 1st NTSC encoders (90,80), and the 2nd RF modulator (140) for vertically phase-modulating the output of 3rd NTSC encoder (130) and transmitting it to 2nd transmission channel (CH2).

Description

High quality TV system compatible with NTSC

1 is an encoding unit of the HDTV system according to the present invention.

2 is a decoding unit of the HDTV system according to the present invention.

3 is a signal reconstruction diagram per field in signal reproduction according to the present invention.

4 is a diagram of side panel rejectors and time extension and signal reproduction in accordance with the present invention.

5 is an operational waveform diagram according to the present invention.

6 is a detailed circuit diagram of the first scan transform unit 30 of FIG.

7 is a detailed circuit diagram of the second scan transform unit 50 of FIG.

8 shows a shifting state of the frequency shift 110 of FIG.

9 is a concrete circuit diagram of the side panel rejector 60 of FIG.

10 is a concrete circuit diagram of the time extension and signal regeneration unit 70 of FIG.

11 is a detailed circuit diagram of the signal reproducing unit 120 of FIG.

The present invention relates to an HDTV system, and more particularly to a high quality system compatible with the NTSC system.

The NTSC signal currently being broadcast has a limitation in resolution because one channel (CH) is 6MHZ. In other words, the resolution has a limitation. Overcoming these limitations, the pursuit of a system with the same resolution as a movie film was started by NHK of Japan in late 1960. As a result of these efforts, Japan encountered its position as the dominant country of HDTV. Japan has already completed the development of HDTV, leaving only the mass production stage.

Meanwhile, Europe and the United States are also racing hard on HDTV, with Europe as HD-MAC and the US as A-TV. In Europe, self-determination is determined, but in the United States, its own method is still undecided, and various methods are being proposed. The proposed schemes include DSRC's ACTV-I, ACTV-II, Zenith's Spectrum compatible television system, and North American Philips' HDS-NA. In line with this trend, there is a demand for HDTV systems that are compatible with NTSC, and each method of HDTV is classified into four types according to the compatibility. The second spectrum compatible system is compatible with the third NTSC, and additional 1 or 0.5 channels are sent to it, and the total is 1.5 or 2 channels, and the fourth is completely incompatible.

Accordingly, it is an object of the present invention to provide a system for adding an additional signal of one channel to an NTSC signal with compatibility with NTSC belonging to the third item.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

)을 각각 감산하는 감산기(21-23)와, 상기 감산기(21-23)의 출력을 소정 쉬프트하여 대역을 이동시키는 제1주파수 쉬프터(110)와, 상기 저역통과필터(40)의 출력중 사이드 판넬신호와 중앙(Conter)신호부분을 구분하는 사이드 판넬 리젝터(60)와, 상기 사이드 판넬리젝터(60)의 출력인 사이드 판넬신호를 시확장하여 다르게 재구성하는 타임확장 및 신호재생부(70)와, 상기 타임확장 및 신호재생 부 (70)의 출력을 엔코딩하여 NTSC화하는 제1NTSC엔코더(80)와, 상기 사이드 판넬 리젝터(60)의 출력을 엔코딩하여 NTSC화하는 제2NTSC엔코더(90)와, 상기 제1주파수쉬프터(110)의 출력

신호를 다운 샘플링에 의해 재구성하는 제1신호재생부(12 0)와, 상기 제1신호재생부(120)을 출력을 엔코딩하여 NTSC화하는 제3NTSC엔코더 (130)와, 상기 제2NTSC엔코더(90)의 출력신호를 동상(In phase)으로 하고 상기 제1NTSC엔코더(80)의 출력을 쿼드라 레이튜어(Quadrature) 페이즈( Phase)로 직각 위상변조(Quadrature Modulation)하여 제1송신채널(CH1)로 전송하는 제1RF변조기(150)와, 상기 제3NTSC엔코더(130)의 출력 신호를 직각 위상변조하여 제2송신채널(CH2)로 전송하는 제2RF변조기(140)로 구성된다.1 is an encoding unit of an HDTV system according to the present invention, which corresponds to a camera unit 10 for acquiring an image using 60 Hz in a 1050 line 2: 1 interlaced scan and an image color output from the camera unit 10. A matrix unit 20 for converting the R, G, and B signals into Y, I, and Q, and 1050 lines 2: 1 interlaced scanning signals output from the matrix unit 20 are sampled in a vertical direction in a 2: 1 direction and 525 lines. 2: A low-frequency filter for filtering the output of the first scan converter 30 for converting into a 1 interlaced scanning signal and the output of the first scan converter 30 in the 5.46 MHZ band, and low-pass filtering the I and Q in the 0.65 MHZ band. A second scan converting unit 50 for interfacing the 525 line 2: 1 interlaced scanning signal through the low pass filter (LPF) 40 and the low pass filter 40 to a 2: 1 interlaced scanning signal of 1050 lines; And the output of the second scan transform unit 50 from the outputs Y, I, and Q of the matrix unit 20.

A subtractor 21-23 for subtracting the subtracter 21, a first frequency shifter 110 for shifting a band by shifting the output of the subtractor 21-23 by a predetermined shift, and the side of the output of the low pass filter 40. A side panel rejector 60 for distinguishing a panel signal from a center signal part, and a time extension and signal reproducing unit 70 for reconstructing and extending the side panel signal which is an output of the side panel rejector 60 differently. A first NTSC encoder 80 for encoding NTSC by encoding the output of the time extension and signal reproducing unit 70, a second NTSC encoder 90 for NTSC encoding the output of the side panel rejector 60, Output of the first frequency shifter 110

A first signal reconstruction unit 120 for reconstructing the signal by down sampling, a third NTSC encoder 130 for NTSC-encoding the output of the first signal reconstruction unit 120, and the second NTSC encoder 90 ) Is in phase and the output of the first NTSC encoder 80 is quadrature modulated in a quadrature phase to the first transmission channel CH1. The first RF modulator 150 is transmitted, and the second RF modulator 140 transmits the output signal of the third NTSC encoder 130 to the second transmission channel CH2 by performing quadrature phase modulation.

2 is a decoding unit of an HDTV system according to the present invention, and includes a first demodulator 210 for demodulating and outputting a signal received through a first reception channel CH1 using an RF right angle demodulation scheme and a second reception channel CH2. A second demodulator (2 20) for demodulating the signal received by the RF quadrature or higher demodulation method, and the side panel signal demodulated at least orthogonally in quadrature phase phase of the first demodulator (210) as an NTSC signal. A second NTSC decoder 240 which decodes the first NTSC decoder 230 signal and the center portion signal demodulated at least orthogonally in the in phase of the first demodulator 2 10 into an NTSC signal, and the first NTSC signal; The time compression and signal regeneration unit 250 for reconstructing the output signal of the decoder 230 into a time compression signal and the side panel output signal of the first NTSC decoder 230 are received by the time compression and signal regeneration unit 250. Compressed and synthesized with the decoded center signal of the second NTSC decoder 240 A side panel injector 260 for preventing roughness of a screen generated by the second NTSC decoder, a third NTSC decoder 280 for decoding a quadrature or more demodulated signal of the second demodulator 220 into an NTSC signal, and the third NTSC decoder ( A second signal regenerator 290 for reconstructing the output signal of the 280, a second wave frequency shifter 291 for shifting the output signal of the second signal regenerator 2 90 to a predetermined frequency, and the side panel injector 260; A third scan converter 270 for converting a 525 line 2: 1 signal into a 1050 line 2: 1 signal, an output of the third scan converter 270 and an output of the second frequency shifter 291 An adder 31-33 for adding s, a demetric part 292 for adding in the adder 31-33 and converting it into R, G, and B signals, and outputs R, G of the demetric part 292. The display device 293 receives the B signal and displays the image.

FIG. 3 is a signal reconstruction diagram per field in signal reproduction according to the present invention, and FIG. 4 is a side panel rejector according to the present invention and time conversion and conversion diagram in signal reproduction.

5 is an operational waveform diagram according to the present invention.

FIG. 6 shows a specific embodiment of the first scan transform section 30 of FIG. 1 and passes 1050 lines 2: 1 interlaced signals 525 lines 2: 1 by sampling them as 2: 1 after going through the vertical LPF 601. The interlaced scan signal is converted, and the output is output one line by one line as shown in the following example.

FIG. 7 shows a specific embodiment of the second scan transform unit 50 of FIG. 1 and undergoes a reverse process of the first scan transformer 30. In other words, because the sampling is in the reverse state, the 525 lines 2: 1 interlace is generated by the interflation according to the line switching of the switch SW1 through the 1H delay circuits 701 to 703 as the following example and the simplified 1050 lines 2: 1 signal.

For example

FIG. 8 illustrates the shifted state of the first frequency shifter 110 of FIG. 1, which is the same as when shifting by the coordinate XO (B).

FIG. 9 is a detailed embodiment circuit diagram of the side panel rejector 60 of FIG. 1, and the LPF 40 output is inputted from the multipliers MU1 and MU2 by the α and β signals of FIG. 5 inputted to the side panel rejector 60. Is multiplied. The multiplication value of Y 'and β is input to the time extension and signal reproducing unit 70, and the multiplication value of Y' and α is processed by the first and second memories 901 and 902 through the switch SW1 to switch SW2. It is input to the second NTSC encoder 90 through. I 'and Q' go through the same process as above. When input to the multiplier MU2, it is input to the first and second memories 901 and 902 via the switch SW1.

의 클럭 레이트를 갖고 출력한다(단, f₁는 입력시의 클럭이다), 즉, 스위치(SW1)를 거쳐 제1메모리(901)에 f₁의 클럭레이트로 입력되면 출력시 스위치(SW2)를 통해

클럭 레이터로 출력하고, 그와 동시에 스위치(SW1)를 통해 제2메모리(902)에 f₁의 클럭 레이트로 입력된다. 즉, 각 라인마다 교대로 제1, 2메모리(901,902)에 입력 혹은 출력된다.When the signal of 6μs-46μs is input as shown in Fig.4,

Output at a clock rate of F1 (where f ₁ is the clock at the time of input), i.e., when the first memory 901 is input at a clock rate of f ₁ through the switch SW1, the switch SW2 is output at the time of output. through

Output to the emulator clock and is input to the second memory 902 through the switch (SW1) at the same time at a clock rate of f _1. That is, each line is alternately input or output to the first and second memories 901 and 902.

의 주파수로써 리드하며, 상기 리드는 연속적으로 한다. 이결과 제4a도와 같은 결과를 얻는다. 이와 같은 방법으로 라인/라인(line by line)으로 처리가 진행된다.FIG. 10 is a circuit diagram for implementing the time extension and signal reproducing unit 70 of FIG. 1, and if there is an input signal from the side panel rejector 60 (when the first line signal is input), the switch SW1 The first memory 210 is controlled by the control signal generator 212. The first memory 210 is written during 0-7 μs and 45 μs-52 μs in FIG. 4. The speed of light is equal to f ₁ of the side panel rejector 60. When the writing of one line is completed, the next line is input. At this time, the switch SW 21 switches to input to the second memory 211 to write to the second memory 211. The method is the same as that of the first memory 210. At that time (at the same time) the switch SW2 is switched in the first memory 210 to read the value in the first memory 210. The speed is

Leads at a frequency of and the leads are continuous. This results in the same result as in FIG. 4a. In this manner, the process proceeds line by line.

FIG. 11 is a detailed embodiment circuit diagram of the first signal reproducing unit 120 of FIG. 1, which sends one pixel out of three pixels in a down sampling concept.

As shown in FIG. 11, a filter consisting of a deflip-flop D1-D6, an amplifier a0-a3, and a synthesizer SUM is applied, and then the clock sample frequency f ₁ is set to 1 in the deflip-flop 118. When latched at a frequency down to / 3, one of three sample values is output. As shown in FIG. 3, the extracted points are different from (3a, 3b, 3c, .... 3f), and the phase of the clock frequency f ₁ is changed for each field. If the phase of (3a, 3b) is 0, (3c, 3d) is a phase of 2π / 3, and (3e, 3f) is a phase of 2π / 2/3.

Therefore, a specific embodiment of the present invention will be described in detail with reference to FIGS. 1 through 11, and the 1050 line 2: 1 interlaced R, G, and B signals output from the camera unit 110 in FIG. It is input to (20) and changed to Y, I, Q.

Y, I, and Q output from the matrix unit 20 are input to the first scan converter 30, and 525 lines 2: 1 interlaced in the 1050 line 2: 1 interlaced scanning format as shown in FIG. The output will be converted to the scan format. Each signal passes through the LPF 40. The Y signal passes through 5.46 MHz, and the I and Q signals pass through 0.65 MHz, respectively. The outputs Y ', I', and Q 'of the LPF 40 are input to the side panel rejector 60 and divided as shown in FIG. That is, when b) a signal is input, 0-7 μs and 45-52 μs are input to the time extension and signal regeneration unit 70, and are output after being extended as shown in 6 μs-46 μs. The Y, I and Q bandwidths of the extended signal are 4.2MHZ, 0.5MHZ and 0.5MHZ, respectively. This signal is input to the first NTSC encoder 80 and converted into an NTSC signal. That is, 0-7μs and 45-52μs are input to the time extension and signal reproducing unit 70 configured as shown in FIG. 10, and 0-7μs is extended to 0-26μs as shown in a) of FIG. The part is extended to 26-52 μs and then NTSC signaled through the first NTSC encoder 80. The first NTSC encoder 80 modulates the NTSC signal by the first RF modulator 150. The signal of the second NTSC encoder 90 is in phase, and the signal of the first NTSC encoder 80 is at least right angle. It modulates at least right angles in a quadrature phase and then transmits it to the first channel CH1.

On the other hand, the output of the matrix unit 20 is also input to the subtractor 21-23, the bandwidth of the output is 36MHZ, Q, I is 4.3MHZ, 4.3MHZ, respectively. The subtractor 21-23 is subtracted from the output of the second scan transform unit 50. The second scan transform unit 50 configured as shown in FIG. 7 retransmits Y ', I', and Q 'signals by 1050. Line 2: Switch to the interlaced signal. In this case, the bands of the Y, I, and Q signals are doubled, and thus 10.92 MHZ (Y), 1.3 MHZ (I), and 1.3 MHZ (Q), respectively. MHZ-36MHZ, I is 1.3M HZ-4.3MHZ, Q is 1.3MHZ-4.3MHZ. This signal is converted into a signal of 0-25 MHZ, I, and Q (0-3 MHZ), respectively, through the first frequency shift 110 as shown in FIG. This signal is input to the first signal reproducing unit 120 configured as shown in FIG. 11 so that the signal is reconstructed. The signal input to the first signal unit 120 is first subsampled in the vertical direction to convert the 1050 line signal into a 525 line signal, and then consists of a signal as shown in FIG.

That is, in the first field, only one of every three samples is sent as shown in a), and only the even line is sent. In the second field, only one odd line is selected from only one of three samples as shown in b). Sending the sixth field information in this way ends the frame information. When this signal is sent, the resolution in the temporal direction decreases, but the resolution in the spatial direction does not deteriorate, and the signal can be produced in NTSC format. The configured signal is input to the third NTSC encoder 130, and the signal is transmitted to the first channel CH1 through the second RF modulator 140. In the present invention, a conventional NTSC signal and a side panel signal are transmitted to the first channel CH1, and high resolution components are sent to the second channel CH2. In the HDTV receiver, the first channel CH1 and the second channel CH2 are transmitted. You can get the high quality of HDTV by receiving both signals and combining both signals. In the first channel CH1 of the signal quality of each channel, Y = 0-10.92 MHZ, I = Q = 1.3MHZ, and the side panel and the frame frequency are 30HZ. In the second channel CH2, Y = 10.92MHZ-36MHZ, I = Q = 1.3-4.3MHZ, and the frame frequency is 10HZ.

There is no significant effect on image quality even if the signals are separated as above, because the resolution exchange method is used. That is, the first channel CH1 has a low spatial resolution + high temporal resolution, and the second channel CH2 has a high spatial resolution + low temporal resolution. + High time resolution screen.

2 is the reverse of the encoding section to the decoding section. When the first channel CH1 and the second channel C H2 are input as a hand signal, the first and second demodulators 210 and 220 demodulate the first and second demodulators 210 and 220, respectively. The demodulated signal is given to the first NTSC decoder 230, and the signal demodulated in phase is given to the second NTSC decoder 240. As a result, the first NTSC decoder 230 receives the side panel signal and the second NTSC decoder. The signal of the center portion is received at 240. The signal input to the first NTSC decoder 230 is decoded and output as an NTSC signal, and the output signal of the first NTSC decoder 230 is a time compression and signal reproducing unit. At 250, the signal a) of FIG. 4 is converted into a signal of 0-7 μs and 45-52 μs of b) of FIG. On the other hand, the center signal passing through the second NTSC decoder 240 is input to the side panel injector 260 so that the signal c) of FIG. 4 becomes 6μs-46μs of b) of FIG.

The signal and the signal of the time compression and signal regeneration unit 250 are synthesized in the side panel and the injector 260, and the 6-7 μs and 45-46 μs portions overlap each other. This part is to prevent the screen from becoming rough due to the mismatch between the side panel and the center signal. This part appears linearly mixed with each other as shown in FIG. 5 below.

를 출력시킨다.The output Y ', I', Q 'of the side panel inject 260 is converted into a 525 line 2: 1 interlaced scanning signal through a third scan converter 270 and converted into a 1050 line 2: 1 interlaced scanning signal.

Outputs

신호(Y대역=0-10.92MH Z, I,Q=0-1.3MHZ)를 가산기(31-33)에서 가산하여 Y=0-36MHZ, I=Q=0-4.3MHZ의 대역을 갖는 Y,I,Q신호를 생성하게 된다.On the other hand, the signal received in the second channel (CH2) is demodulated by the second demodulator 220 in a right angle or more demodulation method is input to the third NTSC decoder 280 and decoded by NTSC. The signal passed through the third NTSC decoder 280 is in the format shown in FIG. 3, which is input to the second signal regenerator 290 to be interlaced with 525 lines 2: 1, and the signal band of Y is 12.6. If the signal is MHZ (I, Q = 1.5MHZ), but this signal is line inflation, it becomes a signal having a band of Y = 25.2MHZ, I, Q = 3MHz, this signal is a second When the frequency shifter 291 is passed, the Y signal band is 10.92MHZ-36MHz, and the I and Q signal bands are signals having a band of 1.3MHZ-4.3MHz. The output signal of the second frequency shift 29 1 and the third scan converter 270

Y having a band of Y = 0-36MHZ, I = Q = 0-4.3MHZ by adding the signal (Y band = 0-10.92MH Z, I, Q = 0-1.3MHZ) in the adder 31-33, I, Q signal is generated.

This signal is converted into R, G, and B signals through the demetrics 292.

The R, G, and B signals generated by the demetric unit 292 are input to the display device 293 to be displayed as HDTV images. The displayed screen is a high resolution signal of 1050 lines 2: 1 interlaced scanning, a luminance band of 36 MHz, and a color band of 4.3 MHz.

As described above, as a kind of HDTV, there is an advantage of easily realizing an image of HDTV while having compatibility with existing NTSC TV through two-channel transmission.

Claims (2)

In an encoder of an HDTV system, a camera unit 10 for acquiring an image using 60 Hz in 1050 line 2: 1 interlaced scanning, and R, G, and B signals corresponding to an image color output from the camera unit 10 The metric line 20 for converting to Y, I, and Q, and the 1050 line 2: 1 interlaced scanning signal output from the matrix unit 20 is sampled in a vertical direction 2: 1 in a 525 line 2: 1 interlaced scanning signal. A low pass filter (LPF) for filtering Y in the 5.46MHZ band and low-pass filtering I, Q at 00.65MHZ 40, a second scan conversion unit 50 for interfacing the 525 line 2: 1 interlaced scanning signal through the low pass filter 40 to a 1050 line 2: 1 interlaced scanning signal, and the matrix unit 20 Output of the second scan converter 50 from the outputs (Y, I, Q)

A subtractor 21-23 for subtracting the subtracter 21, a first frequency shifter 110 for shifting a band by shifting the output of the subtractor 21-23 by a predetermined shift, and the side of the output of the low pass filter 40. A side panel rejector 60 for distinguishing a panel signal from a center part signal, a time extension and signal reproducing unit 70 for reconstructing and extending the side panel signal which is an output of the side panel rejector 60 differently; A first NTSC encoder 80 for encoding NTSC by encoding the output of the time extension and signal reproducing unit 70, a second NTSC encoder 90 for NTSC encoding the output of the side panel rejector 60 at all times, and Output of the first frequency shifter 110

A first signal reproducing unit 120 for reconstructing the signal by down sampling, a third NTSC encoder 130 for encoding NTSC by encoding the output of the first signal reproducing unit 120, and the second NTSC encoder 90 A first RF modulator 150 for outputting the output signal of the first NTSC encoder 80 to the first transmission channel CH1 by performing a quadrature phase modulation in a cradra phase phase and transmitting the third NTSC encoder ( A high quality TV system compatible with NTSC, characterized in that it comprises a second RF modulator (140) for performing a quadrature phase modulation of the output signal of 130) and transmitting it to a second transmission channel (CH2). In the decoder of the HDTV system, a first demodulator (210) for demodulating and outputting a signal received on a first reception channel (CH1) by an RF orthogonal demodulation method and an RF signal received on a second reception channel (CH2). A second demodulator 220 that demodulates by a quadrature or more demodulation method, and a first NTSC decoder 230 that decodes a side panel signal that is demodulated by a quadrature phase of the first demodulator 210 into an NTSC signal; And a second NTSC decoder 240 for decoding the center portion signal demodulated at least at right angles in phase of the first demodulator 210 into an NTSC signal, and reconstructing the output signal of the first NTSC decoder 230 into a time compression signal. The time compression and signal reproducing unit 250 and the side panel output signal of the first NTSC decoder 230 are time-compressed by the time compression and signal reproducing unit 250 to decode the center of the second NTSC decoder 240. Screen coarseness caused by inconsistency combined with signal A side panel injector 260 for preventing the signal, a third NTSC decoder 280 for decoding the quadrature demodulated signal of the second demodulator 220 into an NTSC signal, and an output signal of the third NTSC decoder 280 A second signal regenerator 290, a second frequency shifter 291 for shifting the output signal of the second signal regenerator 290 to a predetermined frequency, and a 525 line 2: 1 signal of the side panel injector 260; A third scan converter 270 for converting a signal into a 1050 line 2: 1 signal, an adder 31-adding an output of the third scan converter 2 70 and an output of the second frequency shifter 291. 33), a demetric unit 292 which is added by the adders 31-33 and converted into R, G, and B signals, and the output R, G, and B signals of the demetric unit 292 are received as an image. A high quality TV system compatible with NTSC, characterized by comprising a display device 293 for displaying.

Images