Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
164 words
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.
Claim 2
Dependent Claim
164 words
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.
Claim 3
Dependent Claim
37 words
A signal matching signal substitution system according to claim 1 wherein said set point means provides said set point as a substantially monotonic function of said current amplitude signal corresponding to the most recently received normal channel.
Claim 4
Dependent Claim
21 words
A signal matching signal substitution system according to claim 2 wherein said monotonic function has a positive slope at low amplitude.
Claim 5
Dependent Claim
45 words
A signal matching signal substitution system according to claim 1 wherein said set point means provides said set point where the signal to noise levels of said normal and subtitute signals upon signal substitution are substantially equal in the signal output of said receiving means.
Claim 6
Dependent Claim
61 words
A signal matching signal substitution system according to claim 1 wherein said set point is set at a predetermined fixed level when said current amplitude signal corresponding to the most current normal channel is relatively high and is set at progressive lower levels when said current amplitude signal corresponding to the most recently received normal channel is below a transition level.
Claim 7
Dependent Claim
38 words
A signal matching signal substitution system according to claim 5 wherein said set point means includes means for gain limiting said set point to the maximum signal output achievable by said gain control means for the normal channel.
Claim 8
Dependent Claim
55 words
A signal matching signal substituting system according to claim 5 wherein said set point means includes means for noise limiting said set point at said progressively lower levels to provide substantially equal signal to noise ratios in the signal output of said tuning means in both said normal and said substitute channels upon signal substitution.
Claim 9
Dependent Claim
38 words
A signal matching signal substitution system according to claim 7 wherein said set point means includes means for gain limiting said set point to the maximum signal output achievable by said gain control means for the normal channel.