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SCA Data transmission system with a raised cosine filter

  • US 4,417,349 A
  • Filed: 11/08/1979
  • Issued: 11/22/1983
  • Est. Priority Date: 11/08/1979
  • Status: Expired due to Term
First Claim
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1. A method of transmitting data at a speed of at least about 4,800 bits per second comprising the steps of:

  • generating digital data;

    containing the bandwidth of the transmitted data by converting said digital data to a bipolar line code format, said bipolar line code format including transitions in the absence of said generated digital data;

    shaping the converted digital data in the time domain to produce shaped digital data;

    frequency modulating a sub-carrier of a commercial broadcast channel with the shaped digital data to produce a modulated sub-carrier; and

    frequency modulating a carrier with the modulated sub-carrier.

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