RE: High-pitch noise with 2.6.0-test11

From: Jean-Marc Valin
Date: Fri Dec 05 2003 - 14:11:58 EST

> Here's the answer from another thread:
> "It's not normal, but it means they used cheap capacitors. This is known
> as the acoustic noise issue. It's related to PCB vibration as a result
> of the piezo electric effect on the caps. What is the timer tick
> frequency? ... The 1ms gives a nice 1kHz tone. It's related to the
> voltage change of C4 exit."

Well, that still doesn't explain why the noise is only there when I
insert thermal.o. Also, the noise seems to be higher than 1 kHz (I'd
guess 5-10 kHz).


Jean-Marc Valin, M.Sc.A., ing. jr.
Université de Sherbrooke, Québec, Canada

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