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Discussion Groups | Image Signal Processing | FIR polyphase filter design
Technical Discussions related to Image Processing (image coding, compression, digital effects, mpeg, etc)
FIR polyphase filter design - peace_for_thriving - Dec 9 23:17:00 2005
Hi,
I am working on FIR polyphase filter design and I need reference to
some theory behind such designs.
Say I want to design a 'P' phase 'T' tap polyphase filter that cuts
off at 'pi/K' (K>1).
I have heard and know from experimentation that I can do this by
designing a P*T tap FIR filter with a cutoff at 'pi/P/K' and then
splitting it into 'P' phases 'T' taps each.
The reasoning behind this that I was offered was that with such a
design each phase would cutoff at:
pi/P/K * P = pi/K; thereby achieving the desired result.
Although this allows me achieve the desired result, I am not
convinced with this justification. It would be a great help if
anyone could offer more insight or point me to some good material.
Many Thanks,
Peace Thriver
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