REQ: Help with Maximum Length Sequences...

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dudelman@yahoo.com - 04 May 2005 23:04 GMT

Hi Folks!

I have the need to test an impulse response of an acoustical device
which I want to accomplish
a) under unix, favorably linux,
b) with the technique of maximum length sequences, and
c) favorably as plugin of baudline (http://www.baudline.com)

Does anyboda know how to add plugins to that program or does anybody
have another solution?

Best regards and thanks in advance - Dudelman.

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Herb Singleton - 04 May 2005 23:27 GMT

> Hi Folks!
>
[quoted text clipped - 8 lines]
>
> Best regards and thanks in advance - Dudelman.

I can't help you with baudline, but another approach would be to use GNU
Octave under Linux (<http://www.octave.org>), generate an MLS signal
using Art Ludwig's code
(<http://www.silcom.com/~aludwig/Signal_processing/Maximum_length_sequenc
es.htm>), and roll your own cross-correlation routine.

Herb

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Herb Singleton
usenet3@ross-specrtrum.com
Sound & Vibration Measurements
http://www.cross-spectrum.com

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robert bristow-johnson - 05 May 2005 02:56 GMT

>> I have the need to test an impulse response of an acoustical device
>> which I want to accomplish
>> a) under unix, favorably linux,
>> b) with the technique of maximum length sequences, and
>> c) favorably as plugin of baudline (http://www.baudline.com)

> I can't help you with baudline, but another approach would be to use GNU
> Octave under Linux (<http://www.octave.org>), generate an MLS signal
> using Art Ludwig's code (..), and roll your own cross-correlation routine.

gotta be *circular* cross-correlation.

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r b-j rbj@audioimagination.com

"Imagination is more important than knowledge."

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robert bristow-johnson - 05 May 2005 05:34 GMT

also, i dunno if you need this, but there's a short little tutorial about
MLS that i wrote and lives at http://www.dspguru.com/info/tutor/mls.htm .
if you need some bit patterns for the shift-XOR operation (these are the
bits of the "primitive polynomials"), i can look up a couple of candidates
for you if you tell me how long you want your MLS to be (before it repeats).

r b-j

> Hi Folks!
>
[quoted text clipped - 8 lines]
>
> Best regards and thanks in advance - Dudelman.

Signature

r b-j rbj@audioimagination.com

"Imagination is more important than knowledge."

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Natural Science Forum / Physics / Acoustics / May 2005

REQ: Help with Maximum Length Sequences...