Patent ID: 7474712

Claim:
A signal processing system, comprising: an inverter configured to selectively negate a plurality of samples of a signal to provide negated and non-negated samples of the signal; and a first low pass filter configured to use a first set of selected ones of the negated and non-negated samples as in-phase (I) of a plurality of complex samples and a second low pass filter configured to use a second set of selected ones of the negated and non-negated samples as quadrature (Q) components of the plurality of complex samples; wherein the plurality of complex samples correspond to the output of an effective sampling function; and further comprising a processor configured to select a beat frequency of the effective sampling function by adjusting the algorithm, including by iteratively adjusting one or both of: a negation sequence in accordance with which samples comprising the plurality of samples of the signal are negated and a sorting sequence in accordance with which samples are sorted into I and Q components, until a beat frequency resulting in an output having a desired characteristic is achieved.