% error y=czt(x, m, w, a) % % Chirp z-transform. Compute the frequency response starting at a and % stepping by w for m steps. a is a point in the complex plane, and % w is the ratio between points in each step (i.e., radius increases % exponentially, and angle increases linearly). % % To evaluate the frequency response for the range f1 to f2 in a signal % with sampling frequency Fs, use the following: % m = 32; %% number of points desired % w = exp(-j*2*pi*(f2-f1)/((m-1)*Fs)); %% freq. step of f2-f1/m % a = exp(j*2*pi*f1/Fs); %% starting at frequency f1 % y = czt(x, m, w, a); % % If you don't specify them, then the parameters default to a fourier % transform: % m=length(x), w=exp(-j*2*pi/m), a=1 % % If x is a matrix, the transform will be performed column-by-column.