Voltage controlled tuner with voltage variable frequency selective arrangements controlled in response to a control voltage generated independently of the tuning voltage

Claim 1

In a receiver, apparatus for selecting various channels comprising: RF input means for supplying RF signals; tuning control means for generating a tuning control voltage in response to the selection of said channels; RF frequency selective means for selectively applying RF carriers received from said RF input means having frequencies corresponding to respective channels to a mixer means in response to respective magnitudes of said tuning control voltage; local oscillator means for generating a local oscillator signal having frequencies corresponding to respective channels in reponse to respective magnitudes of said tuning control voltage; said mixer means being for combining a selected one of said RF carriers and said local oscillator signal to produce an IF signal having at least one information bearing carrier at a predetermined frequency; IF processing means for deriving an information signal from said information bearing carrier; further control means for generating a further control voltage independently of said tuning control voltage but also in response to the selection of said channels; and further frequency selective means coupled to said RF frequency selective means for controlling the frequency response of said RF frequency selective means in response to the magnitude of said further control voltage.