Patent ID: 8035446

Claim:
A digital signal processor (DSP), comprising: an up-sampling module configured to sample an input signal and generate up-sampling points; and a natural sampling module comprising a reference signal generation module configured to generate a reference signal, and a crossing point detection module configured to (i) receive the up-sampling points and the reference signal, (ii) use interpolation to detect intersection points of the input signal and the reference signal, (iii) determine a first value of the input signal at a first evaluation time, (iv) determine a second value of the input signal at a second evaluation time, and (v) estimate a current intersection point of the input signal and the reference signal as an intersection point of the reference signal and a line, wherein the line extends between a first point and a second point on the input signal, wherein the first point corresponds with the first evaluation time, and wherein the second point corresponds with the second evaluation time.