Re: measuring output volume from headphones -- follow-up ("Freed, Dan" )


Subject: Re: measuring output volume from headphones -- follow-up
From:    "Freed, Dan"  <DFreed@xxxxxxxx>
Date:    Thu, 7 Sep 2006 13:07:20 -0700

I don't know of any way that you can check and adjust numerical volume settings through the Windows UI. I have found it necessary to write a Windows application to accomplish this, using the "audio mixer" functions in the Windows Multimedia library. It's a pain in the neck. An alternative is to set the Windows volume control to maximum, then use an external headphone amplifier to control the volume. This takes the Windows slider out of the picture and gives you a physical knob to work with. We sometimes use an audiometer as the external amplifier, which gives us a nicely calibrated volume control. Dan Freed Senior Engineer, Hearing Aid Research Lab House Ear Institute 2100 W. Third St. Los Angeles, CA 90057 USA Phone: +1-213-353-7084 Fax: +1-213-413-0950 Email: dfreed@xxxxxxxx -----Original Message----- From: AUDITORY Research in Auditory Perception [mailto:AUDITORY@xxxxxxxx On Behalf Of Robbin Miranda Sent: Thursday, September 07, 2006 8:50 AM To: AUDITORY@xxxxxxxx Subject: measuring output volume from headphones -- follow-up Thank you to those of you who responded to my previous question. Your comments were extremely helpful! Using a dummy head or coupler seems like a feasible option for the initial set-up of our two testing locations (we will be using the same type of headphones at each location). However, I would also like to be able to quickly check the volume just prior to testing each participant (in case another user adjusts the computer's volume settings). On my computer (Windows XP), all I have been able to find, even in the advanced settings, are scrollbars indicating the volume level. Is there any way to check/adjust numerical values of the volume setting? Thanks again, Robbin Robbin Miranda Interdisciplinary Program in Neuroscience Georgetown University 3900 Reservoir Rd., NW Washington DC 20007 (202) 687-8449


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DAn Ellis <dpwe@ee.columbia.edu>
Electrical Engineering Dept., Columbia University