Patent ID: 6178211
Filing Date: 2001-01-23
Classification: H03G,H04B

Abstract:
A method for digitally processing an intermediate frequency (IF) signal, comprising the steps of:generating a carrier-based signal in an analog broadcast tuner in response to a broadcast signal from an antenna, said analog broadcast tuner applying automatic gain control to said carrier-based signal in order to provide a predetermined signal level;digitizing said carrier-based signal;selecting a first bank of filter coefficients for a filter processor to provide a finite impulse response with a first bandwidth;filtering said carrier-based signal in said filter processor to generate a filtered IF signal;generating a first level signal in response to a signal level of said filtered IF signal;comparing said first signal level with a predetermined threshold; andselecting a second bank of filter coefficients for said filter processor to provide an impulse response with a second bandwidth narrower than said first bandwidth if said first signal level is greater than said predetermined threshold.