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Ono's avatar
Ono
Icon for New Contributor rankNew Contributor
5 years ago

Fractional mode of altera_fir_compiler_ii

altera_fir_compiler_ii version 18.0 What is the configuration in Fractional mode? Is "Up sampling→LPF→Down sampling"? In the Frequency Response (Magnitude) graph of the cofficients tag, It is di...
SengKok_L_Intel's avatar
SengKok_L_Intel
Icon for Regular Contributor rankRegular Contributor
5 years ago

The decimation is deleting the sample, where the Interpolation is adding zero between the sample.

The LPF only processing once, and the output will be deleting the sample (as per decimation factor), and then adding zero (as per interpolation factor).

You may perform the RTL simulation to understand the behaviour in detail.