![]() ![]() The middle ear is an air-filled space approximately 5/8 inch high (15 mm), 1/8 to 3/16 inch wide (2-4 mm), 1/4 inch deep, and 1 to 2 cm 3 in volume in the average adult. Natural resonance of external auditory canal is approximately 3000 Hz of middle ear, 800 to 5000 Hz, mostly 1000 to 2000 Hz of tympanic membrane, 800 to 1600 Hz of ossicular chain, 500 to 2000 Hz. Resonant frequency: frequency at which a mass vibrates with the least amount of external force determined by elasticity, mass, and frictional characteristics of the medium. However, the term “noise” can also mean any unwanted sound. Types of noise frequently used in clinical audiology are white noise (containing all frequencies in the audible spectrum at average equal amplitudes), narrow band noise (white noise with frequencies above and below a center frequency filtered out or reduced), and speech noise (white noise with frequencies > 3000 and < 300 Hz reduced by a filter). Pure tone: single-frequency sound rarely occurs in nature.Ĭomplex sound: sound comprising more than one frequency. Human ear capable of hearing from approximately 20 to 20,000 Hz. Hertz (Hz): in acoustics, unit to express frequency (formerly cycles per second or cps). Time for completion of one cycle is the period. One-tenth of a Bel (named for Alexander Graham Bell).įrequency: number of cycles (complete oscillations) of a vibrating medium per unit of time psychoacoustic correlate is pitch. Sound pressure: sound force (related to acceleration) over a surface per unit time.ĭecibel (dB): unit to express intensity of sound more specifically the logarithm of the ratio of two sound intensities. Intensity of sound: amount of sound energy through an area per time refers to sound strength or magnitude. In psycho acoustics, sounds with higher amplitudes are perceived as louder than sounds with lower amplitude. Sound: energy waves of particle displacement, both compression (more dense) and rarefaction (less dense) within an elastic medium triggers sensation of hearing by vibrating the tympanic membrane.Īmplitude of sound: extent of vibratory movement from rest to farthest point from rest in compression and rarefaction phases of energy waves. ![]()
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