Wavelet Pack Decomposition - Is there a faster way?

I have to do multi-level wavelet decomposition.

I've tried using dwt and calling it recursively. I've also tried using wpdec which returns a tree and then I would extract the coefficients but this takes forever.

Any suggestions?

Answer 1

[Wayne King]

Do you want wavelet packet or wavelet? You say multi-level wavelet and then you say wavelet packet.

If you want wavelet packet, why do you say that wpdec() takes forever.

[John]

Sorry, I meant wavelet packet. I need successive wavelet transforms of both the detail and approximation coefficients. wpdec takes a while because of the efficiency I am looking for in my algorithm. I need it to be faster.

How can I get the DWT matrix for a N = 8192 sample signal?