• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    PROCESSING SYSTEM color television signal, comprising a series-connected demodulator, a first delay line, an inverter, a first adder, a first lowpass filter, second adder sinhroselektor and a third adder, a series connection between the output of the demodulator and the second input of the second adder, the fourth adder, a second the delay line and the second low-pass filter connected in series between the second output of the sync selector and the second input of the third adder, gating unit, first phase second comparator, the first emy controlled oscillator, a first mixer and a first band pass filter serially connected frequency divider, a second phase comparator and a second controllable oscillator which output is connected to the control input. the first delay line and to the input of the frequency divider, the reference frequency generator, the output of which is connected to the second input of the first phase comparator, and the second band-pass filter, whose input is connected to the output of the first adder, and the output connected to the second input of the first mixer, and the output of the demodulator with the second input of the first adder, the inverter input is combined with the second input of the fourth adder, and the output (Y) of the first band-pass filter is connected to the third input of the first phase comparator, with the In order to improve noise immunity, a second mixer and a third band pass filter are inserted in series, the first input of the second mixer, sd, is connected to the output of the support generator, frequency, the second input to the output oo tc of the first controlled oscillator, and the output of the third band pass filter to the second input of the second phase comparator.
    公开号:SU1105132A3
    申请号:SU792850262
    申请日:1979-12-03
    公开日:1984-07-23
    发明作者:Дж.Кристофер Тодд；Лирой Треттер Ларри
    申请人:Рка Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

     . . 11 The invention relates to a technique for recording and reproducing television signals and can be used in video-playing devices to convert a color television signal from one format to another. A known system for processing a color television signal i, comprising a demodulator connected in series, a delay line, a comb filter, and a controlled oscillator and a mixer, the output of which is connected to the control input of the delay line and the second input is connected to the output of the reference frequency generator ij provides full compensation for the shift of the subcarrier frequency of the chroma signal in the delay line, since the synchronization frequency is the sum of two frequencies, one of which reflects changes per hour The signal to be played while the other is a fixed frequency. Closest to the present invention is a color television signal processing system comprising a demodulator connected in series, a first delay line, an inverter, a first adder, a first low pass filter, a second adder, a sync selector and a third adder, sequentially connected between the demodulator output and the second input -second adder, quarter-adder, second delay line and second low-pass filter, connected in series between the second output of the sync selector and the second input of the third totalizer pa, gating unit, first- and second phase comparator, first controlled oscillator, first mixer and first band filter, serially connected frequency divider, second phase comparator and second controlled oscillator, the output of which is connected to the control input of the first delay line and to the input of the frequency divider, the reference frequency generator, the output of which is connected to the second input of the first phase comparator, and the second band-pass filter, the input of which is connected to you with a n & adder, and the output connected to the second One of the first mixers, the demodulator output is connected to the second input of the first sum, the inverter input is combined into the second input of the fourth adder, and the output of the first bandpass filter is connected to the third input of the first phase comparator G 2. The specified system provides almost complete compensation of the subcarrier frequency shift, however It has low noise immunity due to a short phase synchronization cycle based on a color synchronization signal. The purpose of the invention is to improve noise immunity. To achieve a goal, a color television signal processing system comprising a serially connected demodulator, a first delay line, an inverter, a first adder, a first low pass filter, a second adder, a sync selector and a third adder, connected in series between the output of the demodulator and the second input of the second adder, the fourth adder, the second delay line and the second low-pass filter, connected in series between the second output of the sync selector and the second input of the third adder, the gating unit , first phase comparator, first controlled oscillator, first mixer and first band-pass filter, serially connected frequency divider, second phase comparator and second controlled oscillator, the output of which is connected to the control input of the first delay line and to the input of the frequency divider, reference frequency generator whose output is connected to the second input of the first phase comparator, and the second band-pass filter, whose input is connected to the output of the first adder, and the output is connected to the second input of the first mixer, and The demodulator output is connected to the second input of the first adder, the inverter input is combined with the second input of the fourth adder, and the output of the first bandpass filter is connected to the third input of the first phase comparator, the second mixer and the third bandpass filter are connected in series, while the first input of the second mixer is connected with the output of the reference frequency generator, the second input is with the output of the first controlled oscillator, and the output of the third band-pass filter is connected to the second input of the second phase comparator. 3 The drawing shows the structural electrical circuit of the proposed system. The color television signal processing system contains video playback devices 1, demodulator 2, first delay line 3, shaper 4 clock pulses, inverter 5, first, second, third and fourth adders 6–9, first and second filters 10 and 11 of the lower ones frequency, second delay line 12 ,, gating unit 13, first and second phase comparators 14 and 15, latent and second controlled oscillators 16 and 17, first and second mixers 18 and 19, first, second and third band-pass filters 20-22 , frequency divider 23, generator 24 reference frequencies , Sinhroselektor 25, block 26 and inlay rektsii vediokontrolnoe unit 27. The system operates as follows videoplastinke recorded on the information read in videovospro recension present device 1. The eccentricity of an information track videoplastinki deformation of its surface and may cause cyclic variation frequency reconstructed television signal. The full television signal received at the output of demodulator 2 is fed to the input of the first delay line 3, which is made on devices with charge coupling. The time delay of the signal is determined by the shaper of 4 clock pulses, which of the input control signal generates two phase-shifted 180 pulse signals that control the transfer of charge in the first delay line 3. The average delay time approximately corresponds to one period of the TV signal lines in the absence of a synchronization error. The video signal input to the first delay line 3, and the video signal at its output are added in the fourth adder 9. The first delay line 3 and the fourth adder 9 form a comb filter that separates the luminance component from the full-color video signal of the television. When there are no parasitic changes in the frequency of the readable device in the video player 1 from the video plate signal, this comb filter passes the signal with components whose frequencies are equal to an even multiple of half the nominal frequency of the lines, and delays the signal with components that are equal to an odd multiple of half nominal line frequency The first delay line 3, together with the inverter 5 and the first adder 6, forms the second comb filter, which passes the color component of the full television video signal. The output signal from the fourth adder 9 is fed through a second delay line 12, providing a delay of about 500 NS, and a second filter 11 of the lower parts, having a bandwidth of 0-5 MHz, to the input of the second adder 7. The combination process in the second adder 7 serves to supplement the output Signal information, defined sharpness on the vertical. The signal arriving at the second input of the second adder from the output of the first low-pass filter 10 with a passband of 0-500 kHz makes it possible to restore the vertical resolution to a sufficient degree. From the output of the second adder 7, the signal arrives at a block of decorrection 26, which serves to compensate for the predistortion of the signal, which is carried out when recording information on a video plate. The signal then goes to the input of the sync selector 25. At the first output, the capacitance of the video signal of the color image is formed with the sync pulses fixed at about 7 V. At the second output, the clock pulses are applied to the gating unit. The signal from the output of the first adder 6 through the second band-pass filter 21, having a bandwidth of 1 MHz centered at 1.53 MHz, is fed to the first mixer 18, to which the signal c is also applied. the output of the first controlled oscillator 16. The frequency of the signal of this oscillator 16 is regulated by the voltage from the output of the first phase comparator 14, in which the phase of the flash signal of the output of the first band-pass filter 20 output is compared with the phase of the quartz signal
    权利要求:
    Claims (1)
    [1]
    A color television signal processing system comprising serially connected demodulator, first delay line, inverter, first adder, first low-pass filter, second adder, clock selector and third adder, sequentially connected between the output of the demodulator and the second input of the second adder, the fourth adder, in the second delay line and a second low-pass filter, connected in series between the second output of the sync selector and the second input of the third adder, a gating unit, the first phase computer ator, the first controlled oscillator, a first mixer and a first band pass filter serially connected frequency divider, a second phase comparator and the second controlled oscillator, whose output is connected to the control input. the first delay line and to the input of the frequency divider, a reference frequency generator, the output of which is connected to the second input of the first phase comparator, and a second band-pass filter, the input of which is connected to the output of the first adder, and the output is connected to the second input of the first mixer, and the output of the demodulator is connected to the second input of the first adder, the inverter input is combined with the second input of the fourth adder, and the output of the first bandpass filter is connected to the third input of the first phase comparator, characterized in that, with the aim of higher noise immunity, a second mixer and a third bandpass filter are connected in series, the first input of the second mixer is connected to the output of the reference frequency generator, the second input is connected to the output of the first controlled generator, and the output of the third bandpass filter is connected to the second input of the second phase comparator.
    , SU, .. 1105132 ’1105132 2
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3895393A|1974-05-14|1975-07-15|Electrohome Ltd|Double comb filter|
    US3996606A|1975-03-18|1976-12-07|Rca Corporation|Comb filter for video processing|
    US3996610A|1975-12-29|1976-12-07|Rca Corporation|Comb filter apparatus for video playback systems|
    JPS567636B2|1976-03-17|1981-02-18|
    JPS5923154B2|1976-10-08|1984-05-31|Sony Corp|US4286283A|1979-12-20|1981-08-25|Rca Corporation|Transcoder|
    US4357628A|1980-09-23|1982-11-02|Rca Corporation|Video disc player with burst remover|
    JPH056272B2|1981-08-24|1993-01-26|Asahi Optical Co Ltd|
    US4647984A|1984-04-12|1987-03-03|Pioneer Electronic Corporation|Time axis deviation compensation apparatus|
    US4613828A|1985-06-25|1986-09-23|Eastman Kodak Company|Injection-locked video frequency oscillator|
    JPH0478229B2|1985-07-18|1992-12-10|Fuji Photo Film Co Ltd|
    US4926260A|1988-06-02|1990-05-15|U.S. Philips Corporation|Video signal processing circuit|
    JP3157554B2|1991-09-13|2001-04-16|富士フイルムマイクロデバイス株式会社|Semiconductor delay line device and driving method thereof|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/966,512|US4195309A|1978-12-04|1978-12-04|Video processing system including comb filters|
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