# Pulling Radio Waves out of Thin Air

Code and slides for my [PyCon Israel 2018 talk](https://il.pycon.org/2018/schedule/presentation/34/)

Various code that does FM demodulation in all sorts of ways.

## NumPy Demod

```bash
$ python numpy_fm_demod.py capture
$ aplay wbfm-mono-50000.0.raw -r 50000 -f S16_LE -t raw -c 1
```

Note that the final sample rate can never really be 44.1kHz.

Alternatively dump and load samples:

```bash
$ python numpy_fm_demod.py dump out.npy
$ python numpy_fm_demod.py load out.npy
$ aplay wbfm-mono-50000.0.raw -r 50000 -f S16_LE -t raw -c 1
```