www.pudn.com > bss_eval.zip > bss_make_frames.m

function [F_S frames_index] = bss_make_frames(S,WINDOW,NOVERLAP) 
 
% decompose some signal(s) into frames 
% 
% Usage: [F_S frames_index] = bss_make_frames(S,WINDOW,NOVERLAP) 
% 
% Input: 
%   - S: matrix of size n x T (with T>n), 
%   - WINDOW: 1 x W window 
%   - NOVERLAP: number of samples overlap 
% 
% Output: 
%   - F_S:  
%       * if n=1, F_S is a n_frames x W matrix containing the frames (of length W) in 
%       rows, 
%       * if n>1, F_S is a n_frames x W x n tensor containing the frames 
%       decomposition of each row of S. 
%   - frames_index: index of the beginning of each frame in the rows of S 
% 
% Developers:  - Cedric Fevotte (cf269@cam.ac.uk) - Emmanuel Vincent 
% (vincent@ircam.fr) - Remi Gribonval (remi.gribonval@irisa.fr) 
 
[n,T]=size(S); 
 
if n>T 
    disp('Wrong dimensions: must have T>n.') 
    return; 
end 
 
%%% Default values %%% 
W=length(WINDOW); % Length of window 
 
if T < W 
    disp('Please choose a window smaller than the signals.') 
    return; 
end 
 
n_frames = fix((T-NOVERLAP)/(W-NOVERLAP)); % Number of frames 
% If needed the very end of the signal is removed. 
 
frames_index = 1 + (0:(n_frames-1))*(W-NOVERLAP); % Index of beginnings of frames 
 
F_S=zeros(n_frames,W,n); % If n=1, F_S is a 2-D tensor (matrix) 
 
for i=1:n 
    for k=1:n_frames 
        F_S(k,:,i)=(S(i,frames_index(k)+(0:(W-1))).*WINDOW); 
    end 
end