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Signal transmission system for a CATV system

  • US 4,805,014 A
  • Filed: 09/14/1987
  • Issued: 02/14/1989
  • Est. Priority Date: 11/07/1983
  • Status: Expired due to Fees
First Claim
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1. A CATV signal transmitting system comprising:

  • (a) receiving means for receiving a plurality of broadcast satellite channel signals, each channel signal consisting of a base-band video signal modulated on a carrier and a subchannel digitally coded audio signal modulated on a sub-carrier;

    (b) means connected to said receiving means for demodulating a plurality of base-band video signals and a plurality of respective sub-channel digitally coded audio signals from said received plurality of channel signals;

    (c) first modulating means for modulating said plurality of base-band video signals for transmission in respective CATV channels;

    (d) interface means receiving the demodulated sub-channel digitally coded audio signals and arranging said sub-channel digitally coded audio signals so as to be time-division multiplexed into a multiplexed, digitally coded audio signal consisting of a plurality of frames, each frame including at least a portion of each of said demodulated digitally coded audio signals, and an error check code signal;

    (e) second modulating means for modulating said time-division multiplexed digitally coded audio signal from said interface means for transmission in a CATV channel other than said respective CATV channels; and

    (f) means for combining the output signals of said first and second modulating means and for transmitting the combined signals through a CATV transmission line;

    whereby said audio signals as transmitted through said CATV transmission line have a bandwidth and dynamic range that undergo substantially no deterioration.

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