Signal_filter1_low_mean.m

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%This file is part of TEAP.
%
%TEAP 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.
%
%TEAP 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 TEAP.  If not, see <http://www.gnu.org/licenses/>.
% 
%> @file Signal_filter1_low_mean.m
%> @brief Filters the signal with a low pass mean filtering
% 
%> @param  Signal: the signal to filter. Not a bulk signal !
%> @param windowSize: the window size (in samples)
% 
%> @retval Signal: the newly filtered signal
%
%> @author Copyright Frank Villaro-Dixon, 2014
function Signal = Signal_filter1_low_mean(Signal, windowSize)
 
if(nargin ~= 2 || nargout ~= 1)
    error('Usage: Signal = Signal_filter1_low_mean(Signal, windowSize)');
end
 
Signal__assert_mine(Signal);
 
 
raw = Signal__get_raw(Signal);
 
filtAvgEls = ones(1, windowSize)/windowSize;
raw = filtfilt(filtAvgEls, 1, [repmat(raw(1), windowSize, 1); raw']);
 
raw = raw';
 
%take out first second
offset = windowSize + 1;
raw = raw(offset:end);
%and say that the signal was offseted by offset frames
Signal = Signal__set_offset(Signal, Signal__get_offset(Signal) + offset);
 
Signal = Signal__set_raw(Signal, raw);
 
%Indicate that the signal has been filtered
Signal = Signal__set_preproc_lowpass(Signal);