weaver_filter_lpf_4800hz.py

"""
/*

FIR filter designed with
http://t-filter.appspot.com

sampling frequency: 44100 Hz

* 0 Hz - 2400 Hz
  gain = 1
  desired ripple = 1 dB
  actual ripple = 0.7415239985651332 dB

* 2500 Hz - 22050 Hz
  gain = 0
  desired attenuation = -40 dB
  actual attenuation = -40.12206812787664 dB

*/

#define FILTER_TAP_NUM 671

"""


class Filter:
    SAMPLE_RATE = 44100
    LPF_LOW_CUTOFF = 0
    LPF_HIGH_CUTOFF = 4800
    FILTER_TAPS = [
        0.0058556902684298116,
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        0.0021919652499823726,
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        0.0019990816628940805,
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        0.0013800789086448942,
        0.0009556756239063897,
        0.0004935227319758748,
        0.000027895200344081873,
        -0.0004065168131921815,
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filter = Filter()