% the s-tranform test script len = 127; freq = 5; t = 0:len-1; % CREATE the chirp example chirp = cos(2*pi*(10+t/7).*t/len); % add a single peak in the spectrum chirp = chirp + cos(2*pi*(10).*t/len); = st(chirp); % subplot(2,1,1); % plot(chirp); % subplot ...