STFT和ST变换的基本函数，和一个stft的一个例程-This code computes the Stockwell transform (S-Transform) of a one dimensional series without for loop, thereby making it computationally fast and simple. S-Transform was proposed in 1996. A nice tutorial on S-Transform can be found here:

djj.ee.ntu.edu.tw/S_Transform.pdf?





File Information Descr iption　　

The present code is a Matlab function that provides a Short-Time Fourier Transformation (STFT) of a given signal x(n). The algorithm is similar to that of Matlab command “spectrogram”. The result is:

1) stft- a matrix with complex stft coefficients with time across columns and frequency across rows　

2) f- frequency vector　

3) t- time vector.



swt Discrete stationary wavelet transform 1-D.

　　swt performs a multilevel 1-D stationary wavelet decomposition

　　using either a specific orthogonal wavelet ( wname　see

　　WFILTERS for more information) or specific orthogonal wavelet

　　decomposition filters.