For the purpose of this subchapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
DECIBEL (dB). A unit for measuring the volume of a sound, equal to 20 times the logarithm to the base ten of the ratio of the pressure of the sound measured to the reference pressure, which is 20 micropascals (20) micronewtons per square meter.
MOTOR VEHICLE. Any automobile, van, motorcycle, motor-driven cycle, motor scooter, dune buggy, snowmobile, all terrain vehicle, go-cart, minibike, trail bike, and trucks with gross vehicular weight of less than 8,000 pounds.
NOISE LEVEL. The A-weighted sound level produced by a motor vehicle.
SOUND LEVEL METER. An instrument which includes a microphone, amplifier, RMS detector, integrator or time average, output meter and weighing networks used to measure sound pressure levels. Such instrument shall be used for measurement of the intensity of sound and calibrated in decibels as standardized by the American National Standards Institute (ANSI). Readings shall be made on a dB(A) scale.
WEIGHTED SOUND LEVEL. The sound pressure level in decibels as measured on a sound level meter using the A-weighting network. The level so read is designated dB(A).
(Ord. 2006-11, passed 6-5-06)