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, ' OFFENSES-MISCELLANEOUS 9 389.30 ,...~ (h) Certain short term easing of noise restric- tions is essential to allow the construction, main- tenance and continuation of structures, infrastruc- ture, and other elements necessary for the physical and commercial vitality of the city. (i) A substantial body of science and technol- ogy exists by which excessive sound may be substantially abated. (j) Uses of sound amplifying equipment in cer- tain ways and at certain times and places unrea- sonably invades the personal privacy, peace, and personal freedom of citizens and visitors of the city. (k) The city council feels obligated to reason- ably regulate on a content neutral basis the time, place, and manner of using sound amplifying equipment in order to protect the correlative constitutional rights of the citizens and visitors of this community to personal privacy, peace, and personal freedom from diminishment by invasive and unwanted noise which is unnecessary or for which there are ample alternative channels. (97- Or-063, ~ 2, 7-11-97) 389.15. Incorporation by reference. Minne- sota Rules, Chapter 7030, is hereby incorporated by reference, except to the extent specifically inconsistent with this chapter, and made a part hereof as if fully set forth herein. The provisions thereof shall be supplemental to provisions of the Minneapolis Code of Ordinances and shall not preempt such provisions unless such preemption is required by law. (97-0r-063, ~ 3, 7-11-97) 389.20. Other remedies preserved. The pro- visions of this article shall be in addition to and shall not disturb either the right of the city, if such, or the right of individuals affected by the violation, to pursue any other remedy for the abatement of a nuisance, or any other remedy which might or could be available under the law. (Code 1960, As Amend., ~ 948.070) 389.30. Definitions. The following terms when- ever used in this article shall have the following respective meanings: Ambient noise level: The sound level which exists at a point of measurement in the absence of Supp. No. 16 the sound the noise emission of which is mea- sured, being the total effect of all other sounds coming from near and far. The total of all noise in the environment, other than the noise from the source of interest. This term is used interchange- ably with background noise. ANSI: The American National Standards Insti- tute. Attenuation: The reduction of sound intensity by various means (e.g., air, humidity porous ma- terials) . A-weighted sound level: A measure of sound pressure level designed to reflect the acuity of the human ear, which does not respond equally to all frequencies. The ear is less efficient at low and high frequencies than at medium or speech-range frequencies. To describe a sound containing a wide range of frequencies in a manner represen- tative of the ear's response, it is necessary to reduce the effects of the low and high frequencies with respect to the medium frequencies. The resultant sound level is said to be A-weighted, and the units are dB(A). The A-weighted sound level is also called the noise level. Sound level meters have an A-weighting network for measur- ing A-weighted sound level. Audible: Heard or perceived by the human ear. Background noise: The total of all noise in a system or situation, independent of the presence of the desired signal. In acoustical measurements, strictly speaking, the term "background noise" means electrical noise in the measurement sys- tem. The term background noise is often used to mean the noise in the environment, other than the noise from the source of interest. Band: Any segment of the frequency spectrum. Calibrator (acoustical): A device which pro- duces a known sound pressure on the microphone of a sound level measurement system, and is used . to adjust the system to standard specifications. Continuous: Continuing without intermission and seemingly without end. Construction equipment: Any vehicle or device such as a jackhammer, hammerdrill, bulldozer, 1654.1