For purposes of this article, the following words shall have the following meanings:
   (A)   AGRICULTURAL OPERATIONS - Activities occurring on a parcel of real property which is undeveloped and used for cultivation, producing crops, and raising livestock.
   (B)   AMBIENT SOUND LEVEL - The all-encompassing sound level associated with a given location, time of day and duration.
   (C)   A-WEIGHTED SOUND LEVEL - The sound level in decibels as measured on a sound level meter using the A-weighted network (scale) at slow response with the unit of measurement to be defined as dBA.
   (D)   BROADCAST - To operate, or permit the operation of, any sound amplification system on or within a vehicle for the purpose of addressing the public or attracting the attention of persons outside the vehicle.
   (E)   DEVELOPMENT SERVICES DIRECTOR or DIRECTOR - The development services director for the city or designee.
   (F)   CUMULATIVE PERIOD - An additive period of time composed of individual time segments which may be continuous or interrupted.
   (G)   DECIBEL or dB - A unit for measuring the amplitude 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).
   (H)   EMERGENCY MACHINERY, VEHICLE, WORK OR ALARM - Any machinery, vehicle, work or alarm used, employed, performed or operated in an effort to protect, provide or restore safety conditions in the city, or for residents, or work by private or public utilities when restoring utility service.
   (I)   GRADING - Any excavating or falling of earth material or any combination thereof conducted at a site to prepare the site for construction or other improvements thereon.
   (J)   HERTZ or Hz - The unit which describes the frequency of a function periodic in time which is the reciprocal of the period.
   (K)   IMPULSE SOUND - A sound of short duration usually less than one second and of high intensity with an abrupt onset and rapid decay.
   (L)   INTRUDING SOUND LEVEL - The total sound level, in decibels, originating from an alleged offensive source at a specified location.
    (M)   PERSON - An individual, firm, association, copartnership, joint venture, corporation or any entity, public or private in nature.
   (N)   SIMPLE TONE NOISE - A sound characterized by a predominant frequency so that other frequencies cannot be readily distinguished and shall exist if the one-third octave band sound pressure levels in the band with the tone exceeds the arithmetic average of the sound pressure levels of the two contiguous one-third octave bands as follows:  five dB for center frequencies of 500 Hz and above, and by eight dB for center frequencies between 160 and 400 Hz and by 15 dB for frequencies less than or equal to 125 Hz.
   (O)   SOUND LEVEL METER - An instrument meeting American National Standard Institute Standards 51.4-1971 or most recent revision thereof for Type 2 sound level meters or an instrument and the associated recording and analyzing equipment which will provide equivalent data.
   (P)   SOUND LEVEL - Twenty times the logarithm to the base ten of the ratio of the pressure of the sound to a reference pressure which shall be explicitly stated.
(`64 Code, Sec. 19-60.3)  (Ord. No. 2292, 2413)