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import numpy as np
import scipy.signal as signal
from rtlsdr import RtlSdr
class NumpyFmDemod():
'''
Numpy-based FM signal demodulation
Based on the great tutorial by Fraida Fund
https://witestlab.poly.edu/blog/capture-and-decode-fm-radio/
'''
def __init__(frequency, sample_rate=1140000, sample_count=8192000, dc_offset=250000):
self.freq = int(frequency)
self.sample_rate = sample_rate
self.sample_count = sample_count
self.dc_offset = dc_offset
def capture_samples(self):
sdr = RtlSdr()
sdr.sample_rate = self.sample_rate
sdr.center_freq = self.freq - self.dc_offset
sdr.gain = 'auto'
samples = sdr.read_samples(self.sample_count)
sdr.close()
self.raw_samples = np.array(samples).astype('complex64')
if __name__ == '__main__':
nfd = NumpyFmDemod(frequency=96.3e6)
nfd.run()
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