how do normalize an audio file so that the length (row) of the data is equal?

Hello,

I want to do a comparison of 2 audio files (each audio file is speaking "ba a ta") with the existing function in matlab called Dynamic Time Warping (DTW). Before doing a dynamic time warping, I get an array/vector from the Fast Fourier Transfrom (FFT) functions available in matlab, my code so far (my matlab filename: test.m):

fftRecording1 = fft(audioread('C:\Users\handy\Documents\MATLAB\my_recording_1.wav'));
fftRecording2 = fft(audioread('C:\Users\handy\Documents\MATLAB\fajar.wav'));
dist = dtw(fftRecording1, fftRecording2);

When I try the DTW function there is an error because the length (row) of the array/vector 2 file is different. Error message:

Error using dtw (line 82)
The number of rows between X and Y must be equal when X and Y are matrices

Error in test (line 3)
dist = dtw(fftRecording1, fftRecording2);

contents of the fftRecording1 and fftRecording2 variables:

My question is: before do the FFT and DTW, how do step by step normalize so that the length (row) 2 audio files is equal? or there are other ways to make the data length (row) 2 audio files is equal?

Thanks,

Answer 1

[Abhishek Ballaney]

Try zero padding