A television receiver for receiving digital and analog signals that
reduces adjacent channel interference when receiving digital signals
susceptible to interference caused by a lower adjacent NTSC signal. Upon
receiving the digital signal, the receiver heterodynes the digital signal
with a local oscillator (LO) signal to produce an intermediate frequency
(IF) signal. A microprocessor searches a memory unit for stored
information regarding the digital broadcast channel and determines the
presence or absence of a lower adjacent NTSC channel. In the case a lower
adjacent NTSC channel is present, the microprocessor shifts the frequency
of the LO signal causing the IF signal to shift towards the lower band
edge of a surface acoustic wave (SAW) filter present in a digital signal
processor further attenuating the lower adjacent NTSC channel.