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| author | Yuval Adam <_@yuv.al> | 2018-04-16 16:06:53 +0300 |
|---|---|---|
| committer | Yuval Adam <_@yuv.al> | 2018-04-16 16:06:53 +0300 |
| commit | 6b2baa71b1a49e8e542db55f27943a25c5529090 (patch) | |
| tree | 345d0efa4fcfab845dcd036437fb491e02c7745d | |
| parent | 9bbdcccff05ad4e955b323dc3cd61fbe57808a55 (diff) | |
Add blank audio buffer and prepend missing sample
| -rw-r--r-- | async_fm_demod.py | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/async_fm_demod.py b/async_fm_demod.py index e89559d..e1f4640 100644 --- a/async_fm_demod.py +++ b/async_fm_demod.py @@ -10,7 +10,7 @@ device = alsaaudio.PCM(alsaaudio.PCM_PLAYBACK, device='default') device.setchannels(1) device.setrate(50000) device.setformat(alsaaudio.PCM_FORMAT_S16_LE) -device.setperiodsize(5520) +device.setperiodsize(520) async def streaming(): @@ -18,9 +18,17 @@ async def streaming(): sdr.sample_rate = 1.2e6 sdr.center_freq = 91.8e6 + prev = None + + device.write(np.array([0] * 100000).astype('int16')) + async for samples in sdr.stream(): samples = np.array(samples).astype('complex64') samples = signal.decimate(samples, int(1.2e6 / 200e3)) + + if prev is not None: + samples = np.insert(samples, 0, prev) + prev = samples[-1] samples = np.angle(samples[1:] * np.conj(samples[:-1])) x = np.exp(-1 / (200e3 * 75e-6)) |