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# Tutorial 3- Complex Sounds.docx

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School
Department
Psychology
Course
PSYCH 3A03
Professor
Paul Faure
Semester
Fall

Description
September 25 , 2013 Psych 3A03: Audition Tutorial 3: Complex Sounds Practice Problem - 99.9% - 0.1% - 0.001 (converted to decimels) - dB = 10log(0.001) = -30dB transmission loss Ear Canal: A Tube Open at One End - Higher harmonic frequencies occur only at odd integer multiples of the fundamental frequency - Why? - Even harmonics don’t resonate at a tube that is open at both ends or closed at both ends Sample Power/Intensity Problems - An increase in sound power by a factor of 2 corresponds to how many decibels?  dB = 10log(P/Pi) r  dB = 10log(2)  dB = 3.01  Doubling energy is 3 dB increase; doubling pressure is 6dB increase - What is the intensity level re: 10 W/m of a sound whose absolute intensity is 10 W/m 2 -6 2 -12 2  dB = 10log(10 W/m / 10 W/m
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