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Signal matching signal substitution

  • US 4,733,301 A
  • Filed: 06/26/1987
  • Issued: 03/22/1988
  • Est. Priority Date: 06/03/1986
  • Status: Expired due to Term
First Claim
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1. A signal matching signal substitution system wherein substitute signals in a substitute channel are substituted at a viewer'"'"'s television receiver in lieu of normal signals in a normal channel, said system comprising receiving means for selectively receiving signals in respective normal and substitute television channels, input gain control means responsive to a gain control signal for controlling the output signal level of said receiving means, means for switching said receiving means between said normal channel and said substitue channel, means for determining the input signal level of currently received signals in a currently received channel and generating an amplitude signal indicative of said input signal level, set point means responsive to said amplitude signal corresponding to the input signal level for the normal channel most recently received for providing a set point for said output signal level, and means responsive to said set point and said output signal level for generating said gain control signal maintaining said output signal level at said set point.

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