portapack-mayhem/firmware/tools/fir_lpf.py
furrtek d77337dd77 Added CTCSS decoder in NFM RX
RSSI output is now pitch instead of PWM
Disabled RSSI output in WBFM mode
2017-11-28 08:52:04 +01:00

21 lines
381 B
Python

import math
m = 64 - 1
ft = 300.0 / 24000.0
taps = []
window = []
print("Normalized ft = " + str(ft))
for n in range(0, 64):
taps.append(math.sin(2 * math.pi * ft * (n - (m / 2.0))) / (math.pi * (n - (m / 2.0))))
for n in range(0, 64):
window.append(0.5 - 0.5 * math.cos(2 * math.pi * n / m))
for n in range(0, 64):
taps[n] = int(taps[n] * window[n] * 32768)
print(taps)