Sound Measurement Flashcards
Defined as the subjective impression of the unwantednessof a sound or annoyance
Noisiness
Unit of noiseness
NOY
Noise-Induced Hearing Loss (2)
- nerve deafness
- conduction deafness
Caused by damage or degeneration of hair cells in organ of Corti in the cochlea.
Nerve Deafness
Caused by some problem in the outer or middle ear that affects transmission of sound waves to the inner ear.
Conduction Deafness
Occupational Hearing Loss
- temporary hearing loss
- permanent hearing loss
after exposure to continuous noise of sufficient intensity, some temporary hearing loss which is usually recovered a few hours or days after exposure.
Temporary Hearing Loss
Repeated exposure to noise of sufficient intensity produces a permanent hearing threshold shift (PTS).
Permanent Hearing Loss
Hearing Disorders
- Presbycusis
- Sociocusis
- Nosocusis
- Tinnitus
Hearing loss due to normal aging process. Typically, this is greater for men than women.
Presbycusis
Hearing loss due to non-occupational noise sources (e.g. household noises, TV, road traffic, etc.)
Sociocusis
Hearing loss due to a pathological condition.
Nosocusis
is a condition characterized by ringing, swishing, or other noises that appear to be originating in the ear or head.
Tinnitus
Measures the energy output by a sound source, which is basically the sound’s ability to do work.
Power (W)
Measures fluctuations about the local atmospheric pressure caused by the sound.
Pressure (Pa)
The amount of sound energy passing within a specific cross-sectional area taken normal to the direction of propagation.
Intensity (W/m^2)
is a device that measures the intensity of sound at a given moment.
Sound Level Meter
is like a sound level meter except that it stores sound level measurements and integrates these measurements over time
Dosimeter
area where the direct sound dominates and the sound pressure may vary significantly with just small changes in position.
Near Fields
is where the direct sound still dominates and the sound pressure level decreases 6 dB for each doubling distance.
Free Field
it is where the reflected sounds adds to the direct sound and the decrease per doubling of distance will be less than 6 dB
Reverberant Field
Unit of LOUDNESS
Sone
Unit of LOUDNESS LEVEL
Phon
