实验一 短时傅里叶变化与小波变换
1. 实验目的：
a) 熟悉并掌握短时傅里叶变换的性质、参数以及不同信号的短时
傅里叶变换
b) 熟悉并掌握小波变换的性质、参数以及不同信号的小波变换
2. 实验内容：
a) Matlab 中的短时傅里叶变换函数 spectrogram
S = spectrogram(x)
S = spectrogram(x,window)
S = spectrogram(x,window,noverlap)
S = spectrogram(x,window,noverlap,nfft)
S = spectrogram(x,window,noverlap,nfft,fs)
调用及参数描述：
window is a Hamming window of length nfft.
noverlap is the number of samples that each segment overlaps.
The default value is the number producing 50% overlap between
segments.
nfft is the FFT length and is the maximum of 256 or the next power
of 2 greater than the length of each segment of x. Instead of nfft, you
can specify a vector of frequencies, F. See below for more information.
fs is the sampling frequency, which defaults to normalized
frequency
