load?F:\frogman.wav??%載入數(shù)據(jù)（聲音）??
signalOfChirp?=?chirpData‘;??
signalOfChirp_5?=?signalOfChirp/5;??
lengthOfSignal?=?length（signalOfChirp）;??
Fs?=?lengthOfSignal;??%采樣頻率??
T?=?1/Fs;??
t?=?（0:lengthOfSignal-1）*T;??
??
%?繪原始波形圖??
figure;??
subplot（311）;??
plot（t?signalOfChirp）;??
grid?on??
title（‘Original?signal（chirpData）‘）;??
xlabel（‘Time‘）;??
ylabel（‘Amp‘）;??
??
%%?計(jì)算信號(hào)的fft??
NFFT?=?2^nextpow2（lengthOfSignal）;?%求最接近2的冪的數(shù)作為FFT計(jì)算的點(diǎn)數(shù)??
fMax?=?NFFT/2?+?1;??????