Re: [Freetel-codec2] Bit packing and error-correcting library

[<si...@mu...>]

> Hi, guys --
>
> I've been thinking that one thing we should soon try to provide
> ourselves with at least a version of c2 that runs at a proper 2500
> bps. Looking around for a lazy man's solution, I came across this
> library:
> http://qccpack.sourceforge.net/
>

With a quick look it doesn't mention FEC coding in the documentation tab,
I wonder whether it is a example app which does this. If they have useful
code they are LGPL so we can just take want is appropriate - without
having to use it as a library.

Another project I found was:
http://www.ka9q.net/code/fec/
--
This library package provides several forward error correction (FEC)
decoders and accelerated primitives useful in digital signal processing
(DSP). Except for the Reed-Solomon codecs, these functions take full
advantage of the MMX, SSE and SSE2 SIMD instruction sets on Intel/AMD
IA-32 processors and the Altivec/VMX/Velocity Engine SIMD instruction set
on the G4 and G5 PowerPC.
--

Which might also be a useful source.

I have been meaning to ask about chosen bit rates (for codec and FEC),
whether there was a specific reason for these values.

D-Star uses 72bytes per 20ms slice including the FEC. 2400bps for AMBE +
1200bps FEC = 3600bps.

Simon