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demo_blockproc_denoising.m    70 lines (59 with data), 1.8 kB

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function demo_blockproc_denoising(source,varargin)
%DEMO_BLOCKPROC_DENOISING Variable coefficients thresholding
% Usage: demo_blockproc_denoising('gspi.wav')
%
% For additional help call |demo_blockproc_denoising| without arguments.
%
% The present demo allows you to set the coefficient threshold during the
% playback using the control panel.
%
if demo_blockproc_header(mfilename,nargin)
return;
end
% Control pannel (Java object)
% Each entry determines one parameter to be changed during the main loop
% execution.
p = blockpanel({
{'GdB','Gain',-20,20,0,21},...
{'Thr','Treshold',0,0.1,0,1000}
});
%fobj = blockfigure();
% Buffer length
bufLen = 1024;
% Number of frequency channels
M = 1000;
% Setup blocktream
if isoctave
fs=block(source,varargin{:},'L',bufLen);
else
fs=block(source,varargin{:},'loadind',p,'L',bufLen);
end
% Window length in ms
winLenms = 20; %floor(fs*winLenms/1e3)
[F,Fdual] = framepair('dgtreal',{'hann',floor(fs*winLenms/1e3)},'dual',40,M);
[Fa,Fs] = blockframepairaccel(F,Fdual, bufLen,'segola');
flag = 1;
%Loop until end of the stream (flag) and until panel is opened
while flag && p.flag
% Obtain parameters from the control panel
gain = 10^(p.getParam('GdB')/20); % dB -> val
thres = p.getParam('Thr');
%bufLen = floor(p.getParam('bufLen'));
% Read block of length bufLen
[f,flag] = blockread(bufLen);
% Apply analysis frame
c = blockana(Fa, f*gain);
% Plot
% blockplot(fobj,F,c);
% Apply thresholding
c = thresh(c,thres,'soft');
% Apply synthesis frame
fhat = real(blocksyn(Fs, c, size(f,1)));
% Play the block
%fhat = f;
blockplay(fhat);
end
blockdone();
% Close the control panel
p.close();
%fobj.close();