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B. Mitchell Loebel

2009-Jun-22 06:21 UTC

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

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For what its worth ...<br><br>
<font size=4 color="#FF0000"><b>Important corrections (see
below)
...<br><br>
</b></font>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 <font
color="#FF0000"><s>10us</s></font>
10<b>ms</b> of
my input samples, i.e 80 samples. My frame encoding time takes 10 sample
times, i.e. <font
color="#FF0000"><s>1.25us</s></font>&nbsp;
1.25<b>ms</b>, 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. <font
color="#FF0000"><s>0.25us</s></font>
0.25<b>ms</b>.<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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<font face="Times New Roman CYR, Times">---<br><br>
B. Mitchell
Loebel&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;&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;&nbsp;&nbsp;
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