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Diffstat (limited to 'macros/stft.sci')
| -rw-r--r-- | macros/stft.sci | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/macros/stft.sci b/macros/stft.sci index 01d8f9b..7c30360 100644 --- a/macros/stft.sci +++ b/macros/stft.sci @@ -1,4 +1,39 @@ function [y,c]= stft(x, varargin) +//Compute the short-time Fourier transform of the vector X +//Calling Sequence +//Y = stft (X) +//Y = stft (X, WIN_SIZE) +//Y = stft (X, WIN_SIZE, INC) +//Y = stft (X, WIN_SIZE, INC, NUM_COEF) +//Y = stft (X, WIN_SIZE, INC, NUM_COEF, WIN_TYPE) +//[Y,C] = stft (X) +//[Y,C] = stft (X, WIN_SIZE) +//[Y,C] = stft (X, WIN_SIZE, INC) +//[Y,C] = stft (X, WIN_SIZE, INC, NUM_COEF) +//[Y,C] = stft (X, WIN_SIZE, INC, NUM_COEF, WIN_TYPE) +//Parameters +//X: Real scalar or vector +//WIN_SIZE: Size of the window used +//INC: Increment +//WIN_TYPE: Type of window +//Description +//Compute the short-time Fourier transform of the vector X with NUM_COEF coefficients by applying a window of WIN_SIZE data points and an increment of INC points. +// +//Before computing the Fourier transform, one of the following windows is applied: +// +//"hanning" -> win_type = 1 +// +//"hamming" -> win_type = 2 +// +//"rectangle" -> win_type = 3 +// +//The window names can be passed as strings or by the WIN_TYPE number. +// +//The following defaults are used for unspecified arguments:WIN_SIZE= 80, INC = 24, NUM_COEF = 64, and WIN_TYPE = 1. +// +//Y = stft (X, ...)' returns the absolute values of the Fourier coefficients according to the NUM_COEF positive frequencies. +// +//'[Y, C] = stft (x, ...)' returns the entire STFT-matrix Y and a 3-element vector C containing the window size, increment, and window type, which is needed by the 'synthesis' function. funcprot(0); lhs= argn(1); |