DSP Builder for Intel® FPGAs (Advanced Blockset): Handbook

ID 683337
Date 5/27/2022

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Document Table of Contents Half-Band and L-Band Nyquist FIR Filters

Some filtering functions can use a half-band filter where nearly half of the coefficients are zero. The half-band support uses these extra zeros to further reduce the number of multipliers, and thereby reduce the filter cost.

The generalized form of these filters is L-band Nyquist filters, in which every Lth coefficient is zero counting out from the center tap. DSP Builder also supports these structures and can often reduce the number of multipliers required in a filter.