Matlab DWT H-level

2013 3 21
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I'm trying to implement some watermarking algorithm found in a paper. This is a line of the paper:
*Do the H-level DWT for all the renumbered segments.*
Then in simulation section the author explains the wavelet used for experiments.
*DWT transform adopted the common wavelet "Daubechies-1" and level H = 3.*
I just don't get what does H means, how do I input H=3 in matlab DWT function?
My actual code is:
[cA,cD] = dwt(audio,'db3');
Can someone help me?

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