Sig Proc pk - Multirate error

[PhilipOakley]

Following on from
http://collab.mathsoft.com/~Mathcad2000/read?126506,11

I am re-coding some extended wavelet transforms. At their core is a multiple filter bank approach so I am using the signal processing pack's multirate function.

However it appears to loose values from the results array when using upsample m=1, down sample n=2, and daublet(6) as the filter.

Has anyone else found this and forund a formula for the returned length?

Philip Oakley

[PhilipOakley]

I didn't manage to resolve the problem with multirate having an indeterminate return length (especially with 1:2 ratio and variabe filter lengths)


However I did locate an open source version of the upfirdn() function used in Octave and MatLab, which I have coded for comparison.


I can now use this function within my updated wavelet calculations, which are based on public versions in matlab..


\\ correct mistake in Ly calc at 17.18 GMT+1 12/Aug/09


Philip Oakley