AW: measuring output volume from headphones

[Stefan Kerber <kerber@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

A simple way to measure output volume is to measure the voltage at the input
of the headphones (for a defined signal, like a 1kHz sine) and calculate
sound pressure level using the headphones' transfer function. Doing it this
way should also make it easy to change the headphones between different
locations.

Greetings
Stefan

-----Ursprungliche Nachricht-----
Von: AUDITORY Research in Auditory Perception
[mailto:AUDITORY@xxxxxxxxxxxxxxx]Im Auftrag von Robbin Miranda
Gesendet: Mittwoch, 6. September 2006 21:11
An: AUDITORY@xxxxxxxxxxxxxxx
Betreff: measuring output volume from headphones


Hello,
Can any of you recommend a way to measure the output volume/decibel level
from headphones?  We will be testing participants using auditory music and
speech stimuli on two different computers (depending on availability of the
two testing rooms) and would like to make sure that the output volume level
is equivalent at both locations.  We do have a decibel meter (from Radio
Shack), but this doesn't seem feasible to use with headphones.

Thanks,
Robbin

Robbin Miranda
Interdisciplinary Program in Neuroscience
Georgetown University
3900 Reservoir Rd., NW
Washington DC 20007
(202) 687-8449