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25 Cards in this Set
- Front
- Back
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what is the acoustic definition of sound?
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systematic pressure disturbance through an elastic medium
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what is the psychoacoustics definition of sound
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the auditory perception of the disturbance
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What are the five properties of sound?
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frequency, wave length, period, amplitude/intensity, velocity/speed
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what is the unit to convey intensity of sound
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decibel (dB)
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what does dBSPL stand for?
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sound pressure level
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what does dBHL stand for?
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decibel hearing level
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what is the term for the tendency of something at rest to stay at rest and something in motion to stay in motion unless there is an outside force?
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inertia
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what is amplitude?
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the maximum displacement of a mass from it's from it's original position (rest position) at any instant
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what is damping?
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the loss of vibration due to friction
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what is frequency?
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the number of cycles that takes place in a second
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what is Hertz (Hz)?
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the unit of frequency/ cycles per second
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what is period?
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the time that is required for one cycle of periodic motion
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what is a simple back and forth transition in a smooth motion?
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simple harmonic motion
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what is a sinusoidal wave?
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a wave that moves in simple harmonic motion
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what is a oscillatory wave shape?
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a definite repeating pattern- simple or complex
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what is compression
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compression is when air molecules are pushed together
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what is rarefaction
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rarefaction is when air molecules are pushed apart
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what is a periodic wave
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a wave with the same pattern repeated over and over again (simple or complex) with regular intervals, measurable frequency, definitive pitch, harmonic relationship between components
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what is an aperiodic wave
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a wave with no pattern, no regular intervals, no definitive pitch, no harmonic relationship
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what is an example of an aperiodic wave?
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white noise
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"any physically possible complex wave can be represented by a sum of the sinusoidal waves in it" is from what theorem?
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the Fourier Theorem
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what is the lowest frequency in the signal?
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the fundamental frequency
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what is a harmonic fequency
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an integer multiple of the fundamental frequency
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what is super position?
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add amplitudes of two or more sine waves at a given time
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T/F wave length is the opposite of frequency?
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True - the longer the wave length the lower the pitch. the shorter the wave the higher the pitch
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