Patent ID: 8212942

Claim:
A method of controlling a gain in an input digital signal received from a sigma-delta analog-to-digital converter (ΣΔADC) that converts an analog television signal from a tuner to said input digital signal for an analog television receiver, wherein said tuner introduces a DC component to said analog television signal, wherein said input digital signal comprises a video carrier, wherein said video carrier comprising a Luma carrier, and wherein said analog television receiver comprising: a first cascaded integrator comb (CIC) filter that receives said input digital signal from said ΣΔADC; a first down-sampler operatively connected to said first CIC filter, said first down-sampler comprising a down sampling factor of two; a half-band filter operatively connected to said first down-sampler; a second down-sampler operatively connected to said half-band filter; and a first adjacent channel interference (ACI) rejection filter operatively connected to said second down-sampler, wherein said first ACI rejection filter comprises an interpolated filter that provides a sharp transition band performance, wherein said interpolated filter comprises a zero-coefficient for alternate taps, wherein said method comprises: smoothing, in a de-ripple (De-RPL) filter, an in-band ripple in a filter response from said CIC filter; removing, in a digital DC offset cancellation block, said DC component introduced by said tuner; removing, in a programmable notch filter, sinusoid spurs at a plurality of multiple locations in said input digital signal; receiving, in a gain stage, at least one gain from any of a first automatic gain control block (AGC) and a second AGC block; detecting, in phase imbalance correction (PIC) circuitry, a correlation between a I and Q components of said video carrier; removing said correlation; detecting, in amplitude correction (AIC) circuitry, an imbalance between the magnitudes of said I and Q components; correcting said imbalance of said I and Q components; and down-mixing, in a direct digital frequency synthesis (DDFS) circuitry, said Luma carrier of said video carrier to approximately DC.