Considering this is a non-trivial conversion process, with tremendous man-hour
involvement it seems fixed-point development would be best done after
everything is set in concrete. Once FreeDV reaches v1.0 final and after Dayton,
there might be enough popularity to warrant a Kickstarter or similar project -
the more stable the Codec2 floating point version, the easier it would be to
warrant the conversion process.
Anthony
________________________________
From: David Rowe <da...@rowetel.com>
To: freetel-codec2@lists.sourceforge.net
Sent: Sunday, March 3, 2013 4:33 PM
Subject: Re: [Freetel-codec2] codec2 float to fixed
Thanks Jean-Marc and Steve for those comments.
Yes fixed point is a lot of work that adds a whole new level of
complexity. The code becomes harder to understand, and harder to
maintain. In the current "state of the art" the abstractions available
(like compiler extensions, functions macros etc to assist in expressing
the porting) are of limited use - there is still lots of manual work and
hard detail work to express and understand many intricate steps. It's
difficult to delegate the work to people without very specialised
skills.
It's a bit like deciding to re-write the codec in assembler, then
mandating the C and assembler versions must be maintained side by side
forever.
However that does present an interesting challenge. Maybe there is a
way to "engineer" or automate fixed point work so that it's more like
"running a compiler" than hand crafting.
- David
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