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Aud chpt 1-3

vocab

QuestionAnswer
elasticity the abillity of mass to return to it's natural shape
Vibration the to and fro movements of mass
Oscillation the back and forth movement of a vibrating body
Compression That portion of a sound wave where the molecules of the medium are compressed together
Mass The quantity of a body as measured in terms of its relationship to inertia. The weight of a body divided by its acceleration due to gravity.
Stiffness the flexibility or pliancy of a mass. The inverse of compliance.
Force the impetus required to institute or alter the velocity of a body.
aperiodic sound A complex sound that varies randomly over time and does not have a fundamental frequency
Aperiodic wave A wave form that does not repeat over time
cancellation the reduction the the amplitude of a sound wave to zero. This results when two tones of the same frequency and amplitude are introduced 180 degrees out of phase.
component A pure tone constituent of a complex wave.
Complex wave a sound wave made up of a number of different sinusoids, each with a different frequency.
cycle the complete sequence of events of a single sine wave through 360 degrees
damping progressive diminution in the amplitude of a vibrating body.
decibel (dB) a unit for expressing the ratio between two sound pressures or two sound powers; one tenth of a _____
Fourier analysis the mathematical breakdown of any complex wave into its component parts, consisting of simple sinusoids of different frequencies.
frequency the number of complete oscillations of a vibrationg body per unit of time
Forced vibration the vibration of a mass controlled and maintained by an external impetus
Free vibration the vibration of a mass independent of any external force.
Harmonic Any whole-number multiple of the fundamental frequency of a complexwave. The fundamental frequency equals the first ___________
Hearing level (HL) The number of decibels above an average normal threshold for a given signal.
Hertz Cycles per second (cps)
Intensity the amount of sound energy per unit of area.
Fundamental frequency the lowest frequency of vibration in a complex wave.
Period the duration (in seconds) of one cycle of vibration.
Periodic repeats
Phase the relationship in time between two or more waves.
pressure force over an area of surface
pure tone a tone of only one frequency (ie no harmonics)
Pitch the subjective impression of the highness or lowness of a sound; the psychological correlate of frequency.
loudness the subjective impression of the power of a sound. the unit of measurement is the sone.
Rarefaction that portion of a sound wave where the molecules become less densely packed per unit of space.
Resonant frequency the frequency at which a mass vibrates with the least amount of external force; the natural frequency of vibration of a mass.
Sensation level (SL) The number of decibels above the hearing threshold of a given subject fr a given signal.
Sound pressure level (SPL) An expression of the pressure of a sound.
sine wave the waveform of a pure tone showing simple harmonic motion
Spectrum the sum of the compenents of a complex wave.
Threshold In audiometry, the level at which a stimulus, such as a pure tone, is barely perceptible. Usual clinical criteria demand that the level be just high enough for the subject to be aware of the sound at least 50% of the times it is presented.
Velocity the speed of a sound wave in a given direction
wavelength the distance between the exact same point (in degrees) on two successive cycles of a tone.
Created by: dbrinker
 

 



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