§ 70.17 DEFINITIONS.
   For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning. All terminology used in this subchapter, not defined below, shall be in conformance with applicable publications of the American National Standards Institute (ANSI) or its successor body.
   A-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) or dBA.
   LIGHT MOTOR VEHICLE. Any automobile, van, motorcycle, motor driven cycle, motor scooter or light truck with gross vehicular weight of less than 8,000 pounds.
   MODIFIED EXHAUST SYSTEM. An exhaust system in which:
      (1)   The original noise abatement devices have been physically altered causing them to be less effective in reducing noise, or
      (2)   The original noise abatement devices have been either removed or replaced by noise abatement devices which are not as effective in reducing noise as the original devices, or
      (3)   Devices have been added to the original noise abatement devices, such that noise levels are increased.
   NOISE. Any sound which annoys or disturbs humans or which causes or tends to cause an adverse psychological or physiological effect on humans.
   NOISE LEVEL. This shall refer to the A-weighted sound level produced by a light motor vehicle.
   PERSON. Any individual, association, partnership or corporation, and includes any officer, employee, department, agency or instrumentality of a state or any political subdivision of a state.
   SOUND LEVEL METER. An instrument which includes a microphone, amplifier, RMS detector, integrator or time averager, output meter and weighting networks used to measure sound pressure levels. The instrument shall comply with the standards for Type 1 or Type 2 sound level meters as specified in American National Standards Institute Standard ANSI 51.4-1 971 or its successor.
   SOUND PRESSURE LEVEL. Twenty times the logarithm to the base ten of the ratio of the RMS sound pressure to the reference pressure of 20 micropascals. The sound pressure level is expressed in decibels.
('69 Code, § 20-100) (Ord. 0-77-8, passed 10-10-77)