Low Frequency Noise

[Noral D. Stewart]

Mark Codding wrote:
> 
> I'm looking for any info on low or ultra low frequence noise problems.
> Range is below normal hearing but still can be heard by some. Driving
> sister inlaw nuts.I do not have a specific reference, but the Japanese have done the most 
work in this area.  A key word to search is "infrasound."  This refers 
to sound below the normal frequency range of hearing.

Noral Stewart