How do I use correlation coefficients with two audio samples?

Hi, I spectrally analysed a machine gun burst sample and used a spectral modelling synthesis model in Max/MSP to procedurally generate it in real-time and now I'm wanting to use correlation to see how close I got. Due to lack of knowledge in MATLAB I'm looking for a little help to gain my metric. I have attached the audio files

A = "Machine_Gun_Burst.wav";
B = "Dry_Synthesized_Machine_Gun_Burst.wav";
R = corrcoef(A,B);

This was my failed attempt and i got the below error message:

Error using corrcoef>getparams (line 296)

Unmatched parameter name/value pair.

Error in corrcoef (line 119)

[alpha,userows] = getparams(varargin{:});

Answer 1

[Anay]

Hi Taylor,

The error occurred because “corrcoef” expects numerical value of the signals and you were passing the filenames as string. “corrcoef” returns a 2x2 matrix which has ones on the diagonal and correlation coefficients on the off-diagonal elements. You can use “audioread” function to load the audio sample into numeric matrices.

% Read audio files
[orig, fs_orig] = audioread('Machine_Gun_Burst.wav');
[synth, fs_synth] = audioread('Dry_Synthesized_Machine_Gun_Burst.wav');

% Compute Pearson correlation coefficient
correlation_matrix = corrcoef(orig, synth);
r = correlation_matrix(1, 2);  % Off-diagonal element

You can refer to the documentation to gain more information about “corrcoef” by following the below link:

https://www.mathworks.com/help/matlab/ref/corrcoef.html