[AUDITORY] how often should we calibrate? ("Ferguson, Sarah Hargus" )

Subject: [AUDITORY] how often should we calibrate?
From:    "Ferguson, Sarah Hargus"  <safergus@xxxxxxxx>
Date:    Mon, 7 Jan 2008 16:31:13 -0600

Hello all - As I said, my recent trouble with booth noise has raised a larger question for me. With the digital equipment most of us are using nowadays, how often do we really need to calibrate?=20 I can't use insert phones for all of the experiments in my lab, mostly because of the time it would take to teach every lab member how to perform otoscopy. So my plan for experiments using supra-aural phones is to measure the maximum output of the system for the supra-aural phones, use that level to determine the needed attenuator settings, and then use insert phones to confirm that the attenuator is doing what it's supposed to do.=20 Certainly I need to go through these steps at the beginning of an experiment. But how often should I repeat them? I was taught, way back when, to calibrate every day that data were being collected. But if the signal is a digital file stored in the computer, and the signal is being delivered through digital equipment, is that really necessary?=20 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~=20 Sarah Hargus Ferguson, Ph.D., CCC-A Assistant Professor Department of Speech-Language-Hearing: Sciences and Disorders=20 University of Kansas=20 Dole Center 1000 Sunnyside Ave., Room 3001=20 Lawrence, KS 66045 office: (785)864-1116 Speech Acoustics and Perception Lab: (785)864-0610 http://www.ku.edu/~splh/Faculty/FergusonBio.html=20 =20

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