Align Wave

% Time-align two wave signals by shifting wav2 to be aligned with wav1, using cross correlation.
% The inputs 'wav1' and 'wav2' can be either a string of filename or a
% struct in a format such that : 'wav1.s' contains the wave signal in a nSample x 1 vector and 'wav1.sr' is the sampling rate.
%
% All channels in input wav1, wav2 will be averaged before cross correlation comparison.
% The output 'y', 'sr' are modified signals for time-aligned wav2.
% The time of wav1 is alway preserved.
% 'delayT': "Delay" of wav2 with respect to wav1, which means wav2 was "sampled later" (i.e., signals of interest appear "earlier") than wav1 in 'delayT' sec,
% or earlier (if delayT is negative. i.e., signals of interest appear "later") than wav1 in '- delayT' sec.
% 'ifplot': if you want to plot the aligned results. Default = 0.
% 'SaveAsFName' : save the time-aligned wav2 to a specified file. Set to 0 if you don't want to save a file.
% 'resampleSR' : resampling the signals to a common resampling rate. Set to 0 to use the lower sampling rate in wav1 and wav2. Default = 8000;
% 'StartCompareTimeInWav1' : time point (sec.) in wav1 at which the CC comparison starts. {default = 0 sec.}
% 'corr_coeffs' : correlation coefficients.
%
% DEMO:
% StartCompareTimeInWav1 =1.9; % comparing starts from 1.9 sec in wav1;
% [y, sr, delayT] = AlignWave('1.wav', '2.wav', 1, 'alignedwav2.wav', [], StartCompareTimeInWav1);
%
% Weirong Chen 03-23-2014
% Modified Feb-23-2017