# Shared Flashcard Set

## Details

Physics of Sound
Audiology
26
Audiology
09/22/2013

Term
 Physical Perspective of Sound
Definition
 A vibratory energy transmitted by pressure waves in the air or other media
Term
 Psychological Perspective
Definition
 An auditory experience, the act of hearing something
Term
 Mass
Definition
 Amount of quantity of matter
Term
 Physical Properties of Sound
Definition
 Mass and elasticity
Term
 Elasticity
Definition
Term
 Simple Harmonic Motion
Definition
 A type of periodic motion where the restoring force is directly proportional to the displacement; the motion is sinusoidal in time and demonstrates a single resonant frequency
Term
 Damping
Definition
 Progressive diminution in the amplitude of a vibrating body
Term
 Waveform
Definition
 Graph that shows displacement as a function of time
Term
 Properties of Sound Waves
Definition
 Frequency, phase, intensity/amplitude
Term
 Frequency
Definition
 Rate at which a sinusoid repeats its self (cycles per second); expressed in Hz; related to perception of pitch
Term
 Human Range of Hearing (Hz)
Definition
 20Hz-20,000Hz
Term
 Period
Definition
 The duration in seconds of one cycle of vibration; inversely related to frequency
Term
 Wavelength
Definition
 The distance between the exact same point on two successive cycles of a tone; w=c/f
Term
 Speed of Sound in Air
Definition
 343 m/sec, 1130 ft/sec
Term
 Phase
Definition
 Describes the position of 2 waves relative to one another; expressed in degrees; perceived at timbre
Term
 Intensity
Definition
 Described the magnitude of the sound; measured in dB, perceived as loudness
Term
 Decibel Formula
Definition
 20log(pressure measured/pressure referenced)
Term
 Decibel (SPL) Formula
Definition
 20log(pressure measured/20uPa)
Term
 Human Threshold of Hearing (dB, uPa)
Definition
 0-140 dB SPL, 20-200 million uPa
Term
 Complex Periodic Wave
Definition
 A sound that contains multiple harmonically related frequencies that repeats over time
Term
 Fundamental Frequency
Definition
 The lowest frequency of vibration in a complex wave
Term
 Harmonic
Definition
 Any whole number multiple of the fundamental frequency of a complex wave, fundament frequency=1st harmonic
Term
 Fourier Analysis
Definition
 The mathematical breakdown of any complex wave into its component parts, consisting of simple sinusoids of different frequencies
Term
 Complex Aperiodic Waves
Definition
 Waveforms in which there is no repetitive pattern and frequencies that are not harmonically related; no fundamental frequency
Term
 Components of a Pure Tone Audiometer
Definition
 Frequency selector, attenuator dial, transducer selector, router switch, interrupter switch, patient response indicator, VU meter
Term
 Types of Transducers
Definition
 Supra-aural earphones, insert earphones, bone conduction vibrator, loudspeaker, circumaural headphones
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