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Altera_Forum
Honored Contributor
Honored Contributorhalf-band filter
I am trying to implement a half-band filter in Verilog. The questions are: 1. what is the definition for a half-band filter? Is it the same as what we have in traditional multi-rate DSP "P(z)+P(-z)=c...
Altera_ForumHonored Contributor
Honored ContributorIt is a FIR filter that have regular zero every other coeff (except the 3 centre taps) so it can be implemented with half mults. The central coeff can be designed as 2^n implying just pass through if the filter is split into 2 ployphases.
frequency-wise its stopband starts from half of Nyquist. as to multirate it is separate issue. You can use halfband filter on same rate or use it to interpolate by 2(remove images) or decimate by 2 (remove any power beyond input Nyquist). DSPbuilder can do one for you at a click.
