A half-band filter is a finite impulse response (FIR) low-pass filter that reduces the maximum bandwidth of sampled data by a factor of 2 (one octave). When multiple octaves of reduction are needed, a cascade of half-band filters is common.
A half-band filter is a finite impulse response (FIR) low-pass filter that reduces the maximum bandwidth of sampled data by a factor of 2 (one octave). When multiple octaves of reduction are needed, a cascade of half-band filters is common.
Source: Wikipedia "Half-band filter" · CC BY-SA 4.0
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