Subject: Re: low frequency noise in sound booth From: Stuart Rosen <stuart@xxxxxxxx> Date: Sat, 15 Dec 2007 07:56:22 +0000 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>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 UCL 4 Stephenson Way London NW1 2HE England Directions to Wolfson House (where I am based): http://www.phon.ucl.ac.uk/dept/maps.html Tel: (+ 44 [0]20) 7679 7404 Admin: (+ 44 [0]20) 7679 7401 Fax: (+ 44 [0]20) 7679 5107 Email: stuart@xxxxxxxx Home page: http://www.phon.ucl.ac.uk/home/stuart /*------------------------------------------------*/