To use the Discrete Wavelet Transform (DWT) for feature extraction in heart sound analysis using MATLAB, you can go through the following steps:
1. You can load your sound signal into the MATLAB workspace using "load" function in MATLAB.
2. Use the "wavdec" function in MATLAB to decompose the heart sound signal into wavelet coefficients and retrieve the approximate and detailed coefficients from the DWT output.You can use the "appcoef" and "detcoef" functions in MATLAB for this.
3. Now you can extract the features like mean and standard deviation using these coefficients.
You can refer to the attached code snippet for better understanding:
waveletName = 'db4';
decompositionLevel = 4;
[coeffs, levels] = wavedec(heartSound, decompositionLevel, waveletName);
approximation = appcoef(coeffs, levels, waveletName);
details = detcoef(coeffs, levels, 1:decompositionLevel);
Hope this works for you!
