National weather radio reception by synthesizing only center frequency

Claim 1

A television receiver, comprising: tuner means for operating in a first mode for receiving television RF signals, said tuner means selecting a particular television RF signal from a plurality of television RF signals in response to a control signal; said tuner means also operating in a second mode as a first frequency conversion stage for a double conversion broadcast FM radio signal receiver, for receiving broadcast FM radio RF signals and FM broadcast signals of the National Weather Service, said tuner means selecting one of a particular broadcast FM radio RF signal from a plurality of broadcast FM radio RF signals and a broadcast FM signal of said National Weather Service in response to said control signal, and for converting said selected FM RF signal to a first intermediate frequency; a second frequency conversion stage of said double conversion broadcast FM radio signal receiver, said second frequency conversion stage receiving said selected FM radio signal at said first intermediate frequency and converting said selected FM radio signal at said first intermediate frequency to a second intermediate frequency; means for demodulating audio signals from said selected FM radio signal at said second intermediate frequency; said double conversion FM signal receiver also being tuned by a control means substantially to the center of the band of frequencies of the National Weather Service, said FM signal receiver automatically receiving signals broadcast on any one of the frequencies of said band of National Weather Service frequencies; and said control means generating said control signal for causing said tuner means to select one of said particular television RF signal, said particular broadcast FM radio RF signal, and said signals of said National Weather Service band of frequencies.