www.gusucode.com > signal 案例源码程序 matlab代码 > signal/LinearChirpExample.m

    %% Linear Chirp
% Generate a chirp with linear instantaneous frequency deviation. The chirp
% is sampled at 1 kHz for 2 seconds. The instantaneous frequency is 0 at t
% = 0 and crosses 250 Hz at t = 1 second.

% Copyright 2015 The MathWorks, Inc.


%%

t = 0:1/1e3:2;
y = chirp(t,0,1,250);

%%
% Compute and plot the spectrogram of the chirp. Specify 256 DFT points,
% a Hamming window of the same length, and 250 samples of overlap.

spectrogram(y,256,250,256,1e3,'yaxis')