Subject: Calibration question From: "Srikantan S. Nagarajan" <sri(at)DOUG.MED.UTAH.EDU> Date: Thu, 1 Jun 2000 16:07:14 -0600Dear list, I am in the process of setting up a lab to do both auditory neurophysiology and psychophysics. I would like some feedback on calibration equipment and calibration issues. I would like to calibrate circumaural and ear-insert headphones. I do not plan to run experiments on sound localization. I just want to be able to figure out the exact sound amplitude that the subject is hearing in each ear. My questions are: 1. What is the best system for calibrating headphones? Do people use ear-simulators or ear-insert microphones? If so, what models do you use? What kind of microphones? Are they worth the price? If not, what kind of coupling do you use? 2. Can the same system be used for calibrating Etymotic and Sokolic type sound delivery systems. 3. In my previous lab, we used to have an old B&K sound-level meter with linear and A weighting filters. They dont make that model anymore. Do people have any good or bad experiences with particular models from B&K? Are there other vendors that people have found to satisfactory? 4. What are the standards for calibrating speech signals? thanks in advance. -sri -- Srikantan Nagarajan Assistant Professor Department of Bioengineering 20S 2030 East, BPRB Room 506 Salt Lake City, UT 84112-9458 Phone: 801-585-0516 Fax: 801-581-8966 e-Fax: 208-279-6854 Mobile: 801-634-7037 e-mail: sri(at)doug.med.utah.edu