1. A system for extracting pitch from a speech signal having voiced and unvoiced segments, the system comprising: a discrete input; a delay unit that digitally delays the speech signal received through the discrete input; an adaptive filter coupled to the delay unit; and a pitch estimator that analyzes filter coefficients derived from the adaptive filter to estimate the pitch of the speech signal; where the pitch estimator comprises a processor configured to locate a position of a peak in the filter coefficients derived from the adaptive filter, calculate a number of samples that the speech signal has been delayed, identify a sampling frequency of the speech signal, calculate a sum of the number of samples that the speech signal has been delayed and the position of a peak in the filter coefficients, and divide the sampling frequency by the sum to estimate the pitch of the speech signal.