[hpsdr] Morse transcription project

[Rob Frohne]

Hi Chris,

I have such a project already started (GPL).  The first version works, 
but it isn't optimized.  I called it CW-Robot.  It uses the FFT to break 
the SDR bandwidth down into smaller subbands which it decodes the 
signals in.  I really want to change the demodulator into a more matched 
filter detector, and have figured out how to do this, but haven't coded 
it.  Perhaps you would like to join forces with me and make this project 
into something.  The code is and a paper I presented at the DCC this 
year is available at:

http://people.wallawalla.edu/~Rob.Frohne/CW-Robot/

There is another paper I wrote last year for the DCC that explains the 
matched filter and a Maximum a Posteriori (MAP) detector work.

73,

Rob
KL7NA

On 12/02/2010 09:48 AM, Greg - ZL3IX wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Chris,
>
> You may want to run a Google search for "CW Skimmer".  Alex VE3NEA has 
> done a version of what you describe.
>
> 73, Greg, ZL3IX
>
> On 2010-12-03 06:44, Chris Albertson wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> I want to write software that will transcribe Morse CW.  This has of
>> course been done.  But my goal is slightly different.  Most all of
>> these programs accept an audio signal and transcribe the CW from one
>> transmitter.   I want to look at the entire bandwidth of a SDR
>> receiver and simultaneously transcribe all CW in band.  I have some
>> ideas about methods that could be used that I don't see implemented in
>> other software.  Also I have a few hours a week at work to write some
>> kind of "demo" or "test" software and I may as well pick a project I
>> find interesting.
>>
>> That's the background, now for two questions:
>>
>> 1) I know many people here are subscribed to multiple email lists.  So
>> anyone know about one where SDR or digital mode software development
>> internals are discussed.  Most lists are for end users.   Questions
>> I'd ask are about maximum likelihood algorithms and DSP.
>>
>> 2) Anyone have any good recordings of CW.  I'll need good test data of
>> both "easy" and "hard" examples. I can use either audio or I/Q data.
>> It is good to have test data from a wide variety of sources with a
>> wide range of quality
>>
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-- 
Rob Frohne, Ph.D., P.E.
E.F. Cross School of Engineering
Walla Walla University
100 SW 4th Street
College Place, WA 99324
(509) 527-2075			 http://people.wallawalla.edu/~rob.frohne

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