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David Feldman

2009-Jun-20 23:50 UTC

[Speex-dev] Speex for TI MSP430 microcontroller - estimating CPU speed requirements?

Interested in building a speex codec (basically audio <-> speex <->
data
stream) using TI's small MSP430 microcontroller. Is there any way to
estimate feasibility based on CPU requirements? Example - speex is happily
encoding on an old Pentium-1 processor (166 MHz) using about half the CPU
(as reported under Linux); the TI microcontrollers are much slower yet
(8-16-25 MHz)  and there wouldn't be an OS per se - just "to the bare
metal" - so not sure this is even feasible...

Thanks for any comments,

Dave

Jean-Marc Valin

2009-Jun-21 00:02 UTC

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[Speex-dev] Speex for TI MSP430 microcontroller - estimating CPU speed requirements?

David Feldman a ?crit :> Interested in building a speex codec (basically audio <-> speex
<-> data
> stream) using TI's small MSP430 microcontroller. Is there any way to
> estimate feasibility based on CPU requirements? Example - speex is happily
> encoding on an old Pentium-1 processor (166 MHz) using about half the CPU
> (as reported under Linux); the TI microcontrollers are much slower yet
> (8-16-25 MHz)  and there wouldn't be an OS per se - just "to the
bare
> metal" - so not sure this is even feasible...
Unless it has a very fast MAC unit (which I doubt), a 25 MHz
microcontroller is not enough to run Speex.

	Jean-Marc

B. Mitchell Loebel

2009-Jun-21 08:23 UTC

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[Speex-dev] Speex for TI MSP430 microcontroller - estimating CPU speed requirements?

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<body>
For what its worth ...<br><br>
I have a lot of experience with the T.I. MSP430F417 and their DSP's
TMS320VC5409 and TMS320VC5402. I'm running G.729 at 8Kb/sec with an
encoder implementation that I got from India. I assume(???) that Speex
and G.729 are roughly equivalent in terms of processing power needed
(Jean Marc: can you comment on this please?).<br><br>
Here are some numbers: My input samples are at 8KH, 16b wide. My encoded
frame encompasses 10us of my input samples, i.e 80 samples. My frame
encoding time takes 10 sample times, i.e. 1.25us, so real time is
possible with double buffering ... but this is with the DSP running at
80MHZ!! Incidentally, decoding time was about 2 samples, i.e.
0.25us.<br><br>
The MSP430xx that I'm using probably wouldn't come close to working. Its
clock is max'd out at about 7MHZ and it certainly doesn't have as good a
compute engine as the DSP, e.g. no pipeline. T.I. does have some new
generation 430's, but I still doubt its usefulness for your
codec.<br><br>
Please let me know how you make out with your app.<br><br>
<br><br>
At 04:50 PM 6/20/2009, David Feldman wrote:<br>
<blockquote type=cite class=cite cite="">Interested in building
a speex
codec (basically audio <-> speex <-> data<br>
stream) using TI's small MSP430 microcontroller. Is there any way
to<br>
estimate feasibility based on CPU requirements? Example - speex is
happily<br>
encoding on an old Pentium-1 processor (166 MHz) using about half the
CPU<br>
(as reported under Linux); the TI microcontrollers are much slower
yet<br>
(8-16-25 MHz)&nbsp; and there wouldn't be an OS per se - just "to
the bare<br>
metal" - so not sure this is even feasible...<br><br>
Thanks for any comments,<br><br>
Dave<br><br>
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Engineering&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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