What should be the output after extracting features from an audio signal using DWT (Discrete Wavelet Transform) in MATLAB?
<p>I am working on a speech recognition system (I'm following a <a href="http://dyuthi.cusat.ac.in/xmlui/bitstream/handle/purl/3914/PERFORMANCE+OF+DIFFERENT+CLASSIFIERS+IN+SPEECH+RECOGNITION.pdf;jsessionid=0DB3D03E6BB47F8B6789BDBBB8004162?sequence=1" rel="nofollow">research paper</a>), after denoising the signals I want to extract features from audio signals that are in the form of arrays in MATLAB. </p>

<p>Please correct me if I'm wrong but I think that the size of features array (after performing decomposition) should be smaller as compared to the original audio signal.
I used <code>wavedec</code> to decompose the signal upto 10 levels using db8 as the wavelet family, but the output was same in size as the input or slightly larger.</p>