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Re: low frequency noise in sound booth

I too have had this problem. In our quiet room in central London, you can in fact, just about hear the tube trains as they pass under our building. But even when it appears to be completely silent, our spectrum analyser shows strong low frequency sound.

But A-weighting is not necessarily the best way to deal with this problem and is often inappropriate depending upon what one is trying to measure. Our spectrum analyser has the option of summing the power over a specified frequency range, so I simply restrict the measuring range to something like 50 Hz-10 kHz.

Yours - Stuart

Stuart Rosen, PhD
Professor of Speech and Hearing Science
Dept of Phonetics & Linguistics
4 Stephenson Way
London NW1 2HE

Directions to Wolfson House (where I am based):

Tel:   (+ 44 [0]20) 7679 7404
Admin: (+ 44 [0]20) 7679 7401
Fax:   (+ 44 [0]20) 7679 5107

Email: stuart@xxxxxxxxxxxxxx

Home page: http://www.phon.ucl.ac.uk/home/stuart