diff options
| -rw-r--r-- | TALK.md | 8 | ||||
| -rw-r--r-- | async_fm_demod.py | 14 | ||||
| -rw-r--r-- | requirements.txt | 1 |
3 files changed, 15 insertions, 8 deletions
@@ -0,0 +1,8 @@ +## Ideas + +- Radio waves in the air +- Animation of antenna capturing energy from the air +- Modulation basics (AM, FM) how information is encoded in carrier +- Digital modulation modes (ASK, FSK) overview + +- GNU Radio is the go-to framework for building RT flows diff --git a/async_fm_demod.py b/async_fm_demod.py index e1f4640..3d46a9e 100644 --- a/async_fm_demod.py +++ b/async_fm_demod.py @@ -1,17 +1,14 @@ import asyncio -import alsaaudio +import pyaudio import numpy as np import scipy.signal as signal from rtlsdr import RtlSdr -device = alsaaudio.PCM(alsaaudio.PCM_PLAYBACK, device='default') -device.setchannels(1) -device.setrate(50000) -device.setformat(alsaaudio.PCM_FORMAT_S16_LE) -device.setperiodsize(520) +pa = pyaudio.PyAudio() +stream = pa.open(format=pyaudio.paInt16, channels=1, rate=50000, output=True) async def streaming(): sdr = RtlSdr() @@ -20,7 +17,8 @@ async def streaming(): prev = None - device.write(np.array([0] * 100000).astype('int16')) + stream.write(np.array([0] * 100000).astype('int16')) + stream.start_stream() async for samples in sdr.stream(): samples = np.array(samples).astype('complex64') @@ -37,7 +35,7 @@ async def streaming(): samples = signal.decimate(samples, int(200e3 / 50e3)) samples *= 10000 - device.write(samples.astype('int16')) + stream.write(samples.astype('int16')) await sdr.stop() sdr.close() diff --git a/requirements.txt b/requirements.txt index e5912c5..0af5c7b 100644 --- a/requirements.txt +++ b/requirements.txt @@ -29,6 +29,7 @@ pickleshare==0.7.4 prompt-toolkit==1.0.15 ptyprocess==0.5.2 pyalsaaudio==0.8.4 +PyAudio==0.2.11 Pygments==2.2.0 pyparsing==2.2.0 pyrtlsdr==0.2.7 |