Active Noise Cancelling and ultra low frequent singularities!

This question would be better directed to the
alt.sci.physics.acoustics group.

It is also unclear what you are trying to ask.  Below 20 Hz is
generally considered out of the range of normal hearing.  Are you sure
they are trying to cancel that?

This answers lots of questions:
http://www.chrisruckman.com/ancfaq.htm

Daniel Helmick wrote:

I can only guess, but in any kind of signal processing if you're
interested in phenomena at X Hz, you have to pay attention to X/10 Hz
and 10*X Hz.  So a singularity at just a few Hz could conceivably screw
up the math for processing at 20Hz.

But this is just a (somewhat) educated guess -- I agree that the OP
should seek out a group with closer knowledge.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html

I agree with you Tim - I just wonder what causes these ultra low
frequent singularities!

Thanks

Thanks for the direction!