543.02 DEFINITIONS.
   For the purpose of this chapter the following terms, phrases, words and their derivations shall have meanings as follows:
   (a)   "Commercial property" or "commercial zone" means those properties included within districts established by Chapter 1123 of the Planning and Zoning Code and designated C-1 and C-2.
   (b)   "Decibel (dB)" means a unit of sound pressure measurement as defined by the American National Standards Institute Bulletin S1.4-1971.  One decibel or a dB refers to a sound pressure of 0.0002 microbars.
   (c)   "dB(A)" refers to a weighted scale for measuring decibels as defined in the American National Standards Institute Bulletin S1.4-1971.
   (d)   "Frequency" means the number of fluctuations of pressure in one second of time.  The unit of measurement is cycles per second (cps) or hertz (hz).
   (e)   "Industrial property" or "industrial zone" means those properties included within districts established by Chapter 1123 and designated M-1 and M-2.
   (f)   "Impact noise filter" means an instrument that may be used in conjunction with the sound level meter to measure peak intensities of short duration sounds.
   (g)   "Residential property" or "residential zone" means those properties included within districts established by Chapter 1123 and designated R-1, R-2 and R-3.
   (h)   "Sound level meter" means an instrument standardized by The American Standard Association and used for measurement of the intensity of sound and calibrated in decibels.  Readings shall be made on a dB(A) scale.
   (i)   "Sound pressure" means the average rate at which sound energy is transmitted through a unit area perpendicular to a point in a specified direction.
   (j)   "Traffic noise" means sound made by a motor vehicle or vehicle operated either on the public right of way or private property.
      (1964 Code Sec. 99.02)