This Matlab function implements the SIFT algorithm for pitch extraction function [p] = sift (x, samp_rate) where p is a vector which holds the pitch frequency values in Hz at every 10 msec. -This Matlab function implements the SIFT algorithm for pitch extraction　function [p] = sift (x, samp_rate) where p is a vector which holds the pitch frequency values in Hz at every 10 msec.