I am working on analysis of baby cry signal. fundamental frequency(Fo) of signal is already estimated using auto correlation and cepstrum analysis. cry signal is inputted in .wav format. now i want to do short time fourier transform analysis of same signal inorder to find variations in fundamental frequency over the time and plot its "pitch contour". i.e. Fo v/s t. its like finding Fo value for each small interval and plotting over time to see the variability. pls, can anybody help me with the matlab code?