[aprssig] "Best" packet decoder solution

Scott Miller scott at opentrac.org
Mon Dec 27 18:28:35 CST 2010

The OTUSB does use DSP for demodulation... so does the OT1+, but in a 
more simplistic way.  The algorithm is stripped down a bit to use the 
HCS08's 8x8 unsigned multiply, but it does pretty well against the test 
track - I got over 930 decoded.

The 32-bit system will have better dynamic range, and will have enough 
horsepower that I could have it run multiple algorithms in parallel in 
case one's better in certain circumstances.


On 12/27/2010 3:39 PM, Keith VE7GDH wrote:
> Andrew VK4TEC wrote...
>> DSP ?
> That stands for Digital Signal Processing. The TT4 uses DSP.
> I understand that Scott N1VG has an evaluation board with a 32-bit MCU
> capable of 76 MIPS that has some DSP instructions,
> but mentioned that it will take some months to finish developing
> the code. Someone said to Scott "now that you have gone all DSP
> on us..." I'm not sure if that meant that the OTUSB already uses
> DSP. I haven't seen any direct reference indicating that it did.
> http://en.wikipedia.org/wiki/Digital_signal_processing
> http://en.wikipedia.org/wiki/Digital_signal_processor
> Incidentally, Scott sent me an OTUSB a few days ago. I've played
> with a bit, but will have time to give it more of a workout in a few
> days. It was a pleasant surprise to find it in the mailbox without
> having actually ordered one!
> 73 es cul - Keith VE7GDH
> --
> "I may be lost, but I know exactly where I am!"
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