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import asyncio
import numpy as np
import scipy.signal as signal
from rtlsdr import RtlSdr
async def streaming():
sdr = RtlSdr()
sdr.sample_rate = 1.2e6
sdr.center_freq = 91.8e6
audio = None
i = 0
async for samples in sdr.stream():
samples = np.array(samples).astype('complex64')
samples = signal.decimate(samples, int(1.2e6 / 200e3))
samples = np.angle(samples[1:] * np.conj(samples[:-1]))
x = np.exp(-1 / (200e3 * 75e-6))
samples = signal.lfilter([1-x], [1,-x], samples)
samples = signal.decimate(samples, int(200e3 / 50e3))
samples *= 10000
if audio is not None:
audio = np.append(audio, samples.astype('int16'))
else:
audio = samples.astype('int16')
i += 1
if i > 100:
break
else:
print(len(audio))
audio.tofile('test.out')
await sdr.stop()
sdr.close()
loop = asyncio.get_event_loop()
loop.run_until_complete(streaming())
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