Patent ID: 7239358

Claim:
A television receiver for receiving a digital television signal susceptible to an interference caused by a lower adjacent analog television signal, said television receiver comprising: means for determining the presence of said interference; a tuner for receiving the digital signal associated with a broadcast channel selected from a plurality of channel locations in a frequency band; a frequency conversion stage, coupled to said tuner, for converting in frequency the digital signal to an intermediate frequency (IF) signal to be output, where the center frequency of said IF signal is capable of being switched to a nominal frequency corresponding to the selected broadcast channel or to a second frequency being shifted from said nominal frequency in accordance with the presence or absence of said interference determined by said determining means; and a filter, coupled to said frequency conversion stage, for attenuating adjacent signals, said filter having a center frequency equal to said nominal frequency and said second frequency being in the passband of said filter wherein the lower adjacent analog signal is further attenuated by said filter upon switching of the center frequency of IF signal to said second frequency.