PSK31 with a MCU ?

[VolkerR]

I was wondering if anybody has experience with implementing PSK31 (a fairly new amateur radio mode) in a microcontroller. Specifically, would it be possible to use a SSB capable short wave receiver and some hardware to listen to PSK31 conversations on an LC-display, without a PC ?

The amateur radio websites are full of PC+soundcard implementations for (expensive) amateur radio transceivers, but I don't necessarily want to carry a PC around, just the radio and a black box with a (e.g.)4x20 LC-display.

The decoding algorithms are probably high in DSP calculations, but the signal is fairly slow, and MCU like the Atmel megaAVR are fairly fast (up to 62ns cycle time). The Motorola 9S12 series (HC12 compatible) even has a MAC instruction.

Does anybody have links to PSK decoding in C or assembly for small processors ?

Thanks,
Volker

 

[IRstuff]

Have you tried to do a websearch? My second hit had a site with source code.

TTFN

 

[VolkerR]

Hi IRstuff
Yup, but it's always about _encoding_ PSK31, mainly for beacon purposes, not about decoding from an audio signal ...
Have you found PSK31 microcontroller DSP sourcecode ?!? What are your search-keywords ?

 

[IRstuff]

psk31 decode:

http://www.dogpile.com/_1_KPGT8Y02W...tm&qcat=web&qkw=PSK31+decode&start=&ver=14920

TTFN