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Method for transmitting a color video signal on a narrow-band transmission line

  • US 4,210,927 A
  • Filed: 05/08/1978
  • Issued: 07/01/1980
  • Est. Priority Date: 05/11/1977
  • Status: Expired due to Term
First Claim
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1. A method for transmitting a color video signal by a color video signal transmission system over a narrow-band transmission line comprising means for storing an input color video signal in a memory, means for reading said color video signal in the form of a time-divided luminance signal Y and a carrier chrominance signal C, at a speed different from the storing speed, to transmit the luminance signal Y and the chrominance signal C in a narrow band, and a group of clock pulse generating means for driving said memory and the reading means;

  • comprising the steps ofstoring said color video signal in said memory with a write clock having a frequency fH sufficiently high to store a predetermined band of the Y signal in the form of picture elements, while said C signal is rendered a multiple signal which is produced by a quadrature modulation of a carrier of a frequency 1/m·

    n of the write clock frequency fH (m being a given number, and n an integer not less than

         1) in advance of said storing; and

    reading said video signal from said memory by a read clock signal of a frequency fL sufficiently low to transmit said Y signal in a band of the transmission line which is narrower than the band of the input color video signal.

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