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(3) "C" COMMERCIAL DISTRICTS: "C -1" and "C -2" Commercial <br />Districts as defined in the Zoning Chapter of this <br />Code. <br />(4) DECIBEL (did): A unit for measurin the volume of a <br />sound, <br />equal to 0 times t e to ari.thm to the base 10 <br />ot the ratio of the pressure of the sound measured to <br />the reference pressure, which is 20 micro a.scals <br />0 micronewtons per square meter). <br />(5) FREQUENCY: The number of eriodic ocillations, vibra <br />or waves per unit time usually 1 per second). <br />(b) HERTZ (HZ): The unit used for measuring the frequenc <br />a sound. The number of Hertz is the number of cycles <br />per second of a periodic sound pressure wave. <br />(7) NOISE: Any erratic intermittent, and /or statisticall <br />ran om osci lations which result in disttfrbing, harmf <br />or unwanted sound. <br />(8) OCTAVE BAND: A portion of the entire sound frequency <br />spectrum contained within two frequencies A and B suc <br />t amt A = B. <br />(9) PERSON: Any individual, association, partnership or_ <br />corporation which includes any officer, employee, <br />department, agency or instrumentality. <br />(10) PLAINLY AUDIBLE: Any noise for which the information <br />content is unam iguous y communicated to the listener <br />inc u in uiiderstandabl 's oken.- speech, com reliension <br />w et e a voice is raise agitate or norms or <br />compre ensible musical rhythms. <br />(11) RESIDENTIAL DISTRICTS: "A'', "A -1", "A -2 ", "A -3 ", "B" <br />an B residents istrrcts as e i <br />ned in the zonin <br />chapter of this Code. <br />(12) SOUND LEVEL METERS: I'nst'ruments used�for measurement <br />rpose <br />t s. <br />range of at Least 3U -L30 dB re 20 mi_cropascal. <br />(13) SOUND PRESSURE. LEVEL: An objective method to describe <br />the loudness o a sound. <br />(b) All other definitions and term no1gy used in this article <br />which are not speci zca 1y defined shall be in con ormance with aDp icable <br />pu lications o t e American Nations Stan and Institute ANSI or its <br />successor body). <br />SECTION 13 -81 PUBLIC NUISANCE NOISES PROHIBITED. <br />It shall be unlawful for any person to make, continue or cause to <br />be made or continue any loud, or unnecessary noise or any noise which <br />annoys, disturbs, injures, or.en3angers the comfort, health, peace, <br />safety or quality of life of others within the City of South Bend. The <br />following acts are declared to be nuisance noises in violation of this <br />Article, but said enumeration shall not be deemed to be exclusive: <br />-2- <br />