Re: Miller encoding

Max Moser wrote:

Hi there, i research some rf stuff and did it so far with a radio
scanner and a soundcard, but lately we have aquired now a fine
hardware with the right boards. So i wanted to start to port this to
gnu radio.
It seems to be a miller encoding on top of the FM/FSK signal. I didn’t
find so far an implementation in code in the internet. I hacked
something together but am unsure about the correctness.

Does someone here have experiences in miller decoding.

I found this on wikipedia –

Sounds like a very strange encoding. My suggestion would be to do a
quadrature demod on the FSK, and then treat the resulting signal as if
it is at double to specified bitrate. That way there is no concept of
some things happening in the middle of the symbol and some at the end.
Use an MM timing recovery loop to get symbols out, use a simple slicer,
and then write some simple code to decode the double bit rate symbols.


Matt E. wrote:

Sounds like a very strange encoding.
It’s very similar to FFSK. A nice feature of these formats is you don’t
have to worry about polarity.