Com Dis - ComDis110 Lecture 1 Physical Acoustics Use our...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
ComDis110- Lecture 1 9/7/11 Physical Acoustics - Use our ears for communication, environmental awareness - Can communicate through sign language, writing, messaging - Hearing loss can affect a person’s:  Safety- can get in accidents b/c they cannot not hear possibly dangerous situations Social life Ability to form relationships  Temperament- get frustrated b/c can’t express emotions  Performance in school  Sound : a mechanical disturbance propagated through an elastic medium (physical  definition), a type of motion that oscillates Mechanical disturbance : displacing an object from one point to another Displacement  Time Propagated : in a path  Elastic medium : anything that tends to maintain its shape Mass  Pure tone : single oscillation of single frequency  - Amplitude = pitch  - Objects are set into motion by a mechanical disturbance and then they oscillate based  on their own elastic properties- if they are attached to others, they set those objects in  motions - All sound can be represented in the superposition (the arithmetic sum) of the  oscillations 
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Frequency analysis : the ability to identify the rate of the oscillations that make up a  complex sound  Amplitude : point of rest to the maximum displacement Loudness : used to describe the perception of sound Measured in  decibel (dB) : measure of sound intensity  0 dB = absolute threshold, free field  Frequency : number of complete oscillations in a unit of time (1 second)  Measured in  Hertz Higher the frequency  smaller the wavelength Starting phase : time at which the cycle begins- has to do with how sounds combine Diffraction : when a sound wave encounters an object, it bends around the object-  occurs when the wavelength is LARGE in respect to the object Reflection : when a sound wave encounters an object, it bounces off of the object-  occurs when the wavelength is SMALL in respect to the object  Phantom source : you hear the source from an equal distance on the opposite side of  the object  Light has small wavelengths which is why we never see through people b/c things that 
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/21/2012 for the course COM DIS 110 taught by Professor Weismer during the Fall '08 term at University of Wisconsin.

Page1 / 9

Com Dis - ComDis110 Lecture 1 Physical Acoustics Use our...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online