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function demo_blockproc_denoising(source,varargin)
%-*- texinfo -*-
%@deftypefn {Function} demo_blockproc_denoising
%@verbatim
%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.
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/demos/demo_blockproc_denoising.html}
%@end deftypefn
% Copyright (C) 2005-2016 Peter L. Soendergaard <peter@sonderport.dk>.
% This file is part of LTFAT version 2.3.1
%
% This program is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program. If not, see <http://www.gnu.org/licenses/>.
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}
});
% Number of frequency channels
M = 1000;
% Setup blocktream
try
fs=block(source,varargin{:},'loadind',p);
catch
% Close the windows if initialization fails
blockdone(p);
err = lasterror;
error(err.message);
end
% Buffer length (30 ms)
bufLen = floor(30e-3*fs);
% Window length in ms
winLenms = 20; %floor(fs*winLenms/1e3)
[F,Fdual] = framepair('dgtreal',{'hann',floor(fs*winLenms/1e3)},'dual',40,M);
% Or using fwt
%[F,Fdual] = framepair('fwt','ana:symorth3','dual',7);
[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(p);
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