comparison AudioDegradationToolbox/support/adthelper_normalizeAudio.m @ 28:76f45f5c9afd DoP tip

- added units
  * adaptiveEqualizer
  * applyMfccMeanAdaption
- added corresponding data files for presets
- modified applyImpulseReponse to use the estimated average group delay to adjust
  the output audio and keep the timestamps as is (was vice versa before)
- added new units demos, incl one for applyLowpass

+function [f_audio_out,timepositions_afterDegr] = adthelper_normalizeAudio(f_audio, samplingFreq, timepositions_beforeDegr, parameter)
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Name: adthelper_normalizeAudio
+% Date of Revision: 2013-04
+% Programmer: Sebastian Ewert
+%
+% Description:
+% - normalizes audio
+%
+% Input:
+%   f_audio      - audio signal \in [-1,1]^{NxC} with C being the number of
+%                  channels
+%   samplingFreq - sampling frequency of f_audio
+%   timepositions_beforeDegr - some degradations delay the input signal. If
+%                             some points in time are given via this
+%                             parameter, timepositions_afterDegr will
+%                             return the corresponding positions in the
+%                             output. Set to [] if unavailable. Set f_audio
+%                             and samplingFreq to [] to compute only
+%                             timepositions_afterDegr.
+%
+% Input (optional): parameter
+%   .maxAmplitude = 0.999;
+%
+% Output:
+%   f_audio_out      - audio signal \in [-1,1]^{NxC} with C being the number of
+%                      channels
+%   timepositions_afterDegr - time positions corresponding to timepositions_beforeDegr
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Audio Degradation Toolbox
+%
+% Centre for Digital Music, Queen Mary University of London.
+% This file copyright 2013 Sebastian Ewert, Matthias Mauch and QMUL.
+%    
+% 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 2 of the
+% License, or (at your option) any later version.  See the file
+% COPYING included with this distribution for more information.
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Check parameters
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+if nargin<4
+    parameter=[];
+end
+if nargin<3
+    timepositions_beforeDegr=[];
+end
+if nargin<2
+    error('Please specify input data');
+end
+if isfield(parameter,'maxAmplitude')==0
+    parameter.maxAmplitude = 0.999;
+end
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Main program
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+f_audio_out = [];
+if ~isempty(f_audio)
+    f_audio_out = parameter.maxAmplitude * f_audio / max(max(max(abs(f_audio))),eps);
+end
+
+% This function does not impose a delay
+timepositions_afterDegr = timepositions_beforeDegr;
+
+end
+
+
+