All terminology used in this chapter that is not defined below shall be in conformity with applicable publications of the American National Standards Institute (ANSI) or its successor body.
   (a)   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.
   (b)   LIGHT MOTOR VEHICLE. For purposes of §§ 446.04 to 446.07, means any automobile, van, motorcycle, motor driven cycle, motor scooter or light truck with a gross vehicular weight of less than 8,000 pounds.
   (c)   MODIFIED EXHAUST SYSTEM. An exhaust system in which one or more of the following are true:
      (1)   The original noise abatement devices have been physically altered causing them to be less effective in reducing noise;
      (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; and/or
      (3)   Devices have been added to the original noise abatement devices, such that noise levels are increased.
   (d)   NOISE. Any sound that annoys or disturbs humans or that causes or tends to cause an adverse psychological or physiological effect on humans.
   (e)   NOISE LEVEL. The A-weighted sound level produced by a light motor vehicle.
   (f)   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.
   (g)   RESIDENTIAL AREA. Areas set forth as R-1-A, R-1-B, R-1-C, R-1-D, R-1-E, R-1-F, R-2, R-3, R-3-A or R-3-B in §§ 1262.01 and 1262.02 of the Planning and Zoning Code.
   (h)   SOUND LEVEL METER. An instrument that includes a microphone, amplifier, RMS detector, integrator or time averager, output meter and weighting networks and that is 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 S1.4-1971 or its successor.
   (i)   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.
(Ord. 1989-229, passed 10-2-1989)