(1) A-Weighted Sound Pressure Level. The sound pressure level as measured with a sound level meter using the A-weighting network. The standard notation is dB(A) or dBA. (1.1)

(2) Ambient Sound Pressure Level. The sound pressure level of the all-encompassing noise associated with a given environment, usually a composite of sounds from many sources. It is also the A-weighted sound pressure level exceeding 90 percent of the time based on a measurement period, which shall not be less than 10 minutes. (1.2)

(3) Continuous Sound. Any sound that exists, essentially without interruption, for a period of 10 minutes or more. (1.3)

(4) Cyclically Varying Noise. Any sound that varies in sound level so that the same level is obtained repetitively at reasonable uniform intervals of time. (1.4)

(5) Decibel. Logarithmic and dimensionless unit of measure often used in describing the amplitude of sound. Decibel is abbreviated dB. (1.5)

(8) Device. Any mechanism that is intended to produce, or that actually produces noise when operated or handled. (1.8)

(9) Dynamic Braking Device. A device used primarily on trucks for the conversion of the engine from an internal combustion engine to an air compressor for the purpose of braking without the use of wheel brakes, commonly referred to as a "Jacob's Brake." (1.9)

(10) Emergency Work. Work required to restore property to a safe condition following a public calamity or to protect persons or property from an imminent exposure to danger. (1.10)

(11) Emergency Vehicle. A motor vehicle used in response to a public calamity or to protect persons or property from an imminent exposure to danger. (1.11)

(12) Impulsive Noise. A noise containing excursions usually less than one second or sound pressure level using the fast meter characteristics. (1.12)

(13) Motor Vehicle. Any vehicle that is self-propelled by mechanical power including, but not limited to, passenger cars, trucks, truck-trailers, semi-trailers, campers, motorcycles, minibikes, go-carts, snowmobiles and racing vehicles. (1.13)

(14) Muffler. An apparatus consisting of a series of chambers or baffle plates designed to transmit gases while reducing sound. (1.14)

(16) Noise Disturbance. Any sound that annoys or disturbs a reasonable person(s) with normal sensitivities or that injures or endangers the comfort, repose, health, hearing, peace or safety of another person(s). (1.16)

(17) Noise. Any sound that is unwanted and causes or tends to cause an adverse psychological or physiological effect on human beings. (1.17)

(19) Person. Any individual, public or private corporation, partnership, association, firm, trust, estate, the state or any of its departments or political subdivisions, institution, bureau or agency thereof, county, city or any legal entity that is recognized by the law. (1.19)

(20) Plainly Audible Noise. Any noise for which the information content of that noise is unambiguously transferred to the listener including, but not limited to, the understanding of spoken speech, comprehension of whether a voice is raised or normal, or comprehension of musical rhythms. (1.20)

(21) Property Boundary. An imaginary line at the ground surface and its vertical extension that separates the real property owned by one person from that owned by another person. (1.21)

(22) Public Right-of-way. Any street, avenue, boulevard, highway, alley or similar place that is owned or controlled by a public governmental entity. (1.22)

(23) Pure Tone. Any sound that can be distinctly heard as a single pitch or a set of single pitches. For the purposes of measurement, a pure tone shall consist of the one-third octave band sound pressure level in the band when the tone exceeds the arithmetic average of the sound pressure levels of the two contiguous one-third octave bands by five dB for frequencies of 500 Hz and above, by eight dB for frequencies between 160 and 400 Hz, and by 15 dB for frequencies less than or equal to 125 Hz. (1.23)

(24) Repetitive Impulsive Noise. Any noise that is composed of impulsive noises that are repeated at sufficiently slow rates such that a sound level meter set at "fast" meter characteristic will show changes in sound pressure level greater than 10 dB(A). (1.24)

(25) Sound. A temporal and spatial oscillation in pressure, or other physical quantity with interval forces that causes compression and rarefaction of the medium, and that propagates at finite speed to distant points. (1.25)

(26) Sound Level Meter. An instrument, including a microphone, amplifier, RMS detector and integrator, time averager, output meter or visual display or both, and weighting networks, that is sensitive to pressure fluctuations. The instrument reads sound pressure level if properly calibrated and is of type two or better as specified in American National Standards Institute Publication 81. 4-1971 or its successor publications. (1.26)

(27) Sound Pressure. The instantaneous difference between the actual pressure and the average or barometric pressure at a given point in space due to sound. (1.27)

(28) Sound Pressure Level. Twenty times the logarithm to the base 10 of the ratio of the RMS sound pressure to the reference pressure, which shall be 20 micropascals and abbreviated LP or SPL. (1.28)

(29) Stationary Noise Source. Any device, fixed or movable, that is located or used on property other than a public right-of-way. (1.29)

(30) Steady Noise. A sound pressure level that remains essentially constant during the period of observation and does not vary more than 6 dB(A) when measured with the "slow" meter characteristic of a sound level meter. (1.30)

(31) Percentile Sound Pressure Level.