[speex-dev] speex over radio and homemade hardware

Matthias Granberry matthias at utdallas.edu
Wed Oct 1 19:27:34 PDT 2003

All I have to say is 'good luck.'  If you only need a few miles range
and you are in a non-commercial setting, amateur radio is probably the
way to go.  Walkie-talkie style communication is probably worth the
money.  I suppose CB or the FRS (cheap wal-mart style) might also be
an option.

If you still want to do it over the data line, speex reports a 2150bd
mode, which is recognizable, but quite poor quality.  I suppose it's
not horrible, but it isn't going to be quite so low-bitrate when you
have IP (or some other) packets encapsulating it.  If it doesn't need
to be real-time or streaming, you might be able to get something
working.  I suppose if you package a few seconds of some low-quality
speex frames, it could be sent near-real-time.  The relaxation of
real-time requirements would let you use the much better-sounding
3950, 5950, and 8kbps modes.  There's also a 4.8kbps mode in the
library that I haven't used.

"Ian Smith" <i3smith at wmich.edu> writes:

> I've been given the task to hunt down a codec that out solar car team
> can use to transmit and receive data over a radio link between a chase
> car and the solar car its self.  As of now I do not know the exact
> specifications of the internal hardware of the car, what I do know is
> they are looking at transmitting across a 2400baud connection, the unit
> in the car is homemade from our labs here.  From what I understand it
> can be programmed quite easily.  What I've was wondering is will this
> speex will satisfy my needs, naturally with some modification to fit our
> hardware?  Oh I should also mention that the setup in the chase car will
> probably be a linux or win32 laptop with the radio connection, already
> the radio transmits telemetry data such as speed, voltage of batteries
> and other stuff, I don't know how they currently have that working but
> my adviser seemed pretty confident that I could find a solution, and
> seeing as how I am still in my first semester of college taking
> cs11(c++) I havnt had much experience dealing with other platforms
> outside of linux and win32.  Please tell me what you think, if maybe I
> could get this to work in a few months.

Matthias Granberry
matthias at utdallas.edu
(469) 371-0596
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