A digital IF demodulator includes an analog-to-digital (A/D) converter
that receives an analog IF signal and converts it to a digital IF signal.
A parallel multiplier then down-converts the digital IF signal to a
baseband signal having a video component and an audio component. The
frequency down-conversion uses a parallel multiplier driven by an outer
feedback loop that corrects gross frequency errors in said digital IF
signal. The digital IF demodulator also includes a video recovery circuit
that selects the video component from the baseband signal and further
down-converts the baseband signal to a video baseband using a video
complex mixer driven by an inner feedback loop that corrects fast phase
perturbations in the video recovery circuit. Finally, the digital IF
demodulator includes an audio recovery circuit that (i) receives said
baseband signal from the parallel multiplier, and (ii) down-converts the
audio component to an audio baseband signal using an audio complex mixer.