Patent ID: 7212137

Claim:
A digital signal processing system comprising: a delta-sigma modulator having an internal filter coupled to a quantizer, wherein (i) the delta sigma modulator implements a low-pass signal transfer function, (ii) an input sample rate of input samples received by the delta sigma modulator is an integer multiple greater than one of an output sample rate of the delta sigma modulator, (iii) the internal filter and the quantizer of the delta sigma modulator operate at the output sample rate f s , and (iv) the internal filter comprises: a first integrator to process the input samples and generate a first integrator output signal; and a second integrator, coupled to the first integrator, to process first and second input samples and the first integrator output signal during a single cycle of the delta sigma modulator, wherein the first and second input samples represent two successive-in-time samples of an input signal to the delta sigma modulator, the first and second input samples are modified by different gains prior to processing by the second integrator, and the cycle of the delta sigma modulator equals 1/f s .