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Modified vestigial side band transmission system

  • US 4,312,064 A
  • Filed: 01/25/1980
  • Issued: 01/19/1982
  • Est. Priority Date: 01/29/1979
  • Status: Expired due to Term
First Claim
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1. A telephone transmission system providing multiple modulated carrier communication channels between a single central station and plural remote stations on a single transmission medium which exhibits phase nonlinearities at certain frequencies, comprising:

  • plural transmitters at said central and remote stations, each generating on said transmission medium double side band AM modulated communication signals at different carrier frequencies; and

    plural receivers at said central and remote stations, each tuned to one of said different carrier frequencies on said transmission medium, at least one of said plural receivers, which receiver is tuned to receive the double side band AM modulated communication signal from one of said plural transmitters, and which receiver is tuned to one of said certain frequencies which exhibit phase nonlinearities, attenuating at least a portion of one of said double side bands more than the corresponding portion of the other of said side bands to eliminate side band phase cancellation.

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