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OFFENSES-MISCELLANEOUS ~ 389.30 ~ craft, highways, industrial, commercial, residen- tial), or has an erratic, intermittent, or statisti- cally random oscillation. Noise area classification or noise classification area: The noise area classifications and activities included in Minnesota Rules, Chapter 7030, ad- ministered by the Minnesota Pollution Control Agency, except where specifically altered herein. Noise level: The sound level. For airborne sound, unless specified to the contrary, it is the A- weighted sound level. Noisy assembly: For the purposes of sections 389.65 (c)(1) and 389.65 (c)(2), the term "noisy assembly" shall mean a gathering of more than one person in a residentially zoned or used area or building between the hours of 10:00 p.m. and 6:00 a.m. that would be likely to cause significant discomfort or annoyance to a reasonable person of normal sensitivities present in the area consider- ing the time of day and the residential character of the area. Non-impulsive noise: All noise not included in the definition of impulsive noise. Octave: The interval between two sounds hav- ing a frequency ratio of two (2). There are eight (8) octaves on the keyboard of a standard piano. Peak sound pressure: The maximum absolute value of the instantaneous sound pressure in a specific time interval. Note: In the case of a periodic wave, if the time interval considered is a complete period, the peak sound pressure be- comes identical with the maximum sound pres- sure. Points of habitation: Any point inside a dwell- ing and any deck, patio, or other outdoor area that contains seating or cooking areas designed for the use of the occupants and within thirty (30) feet of the adjoining dwelling. Outdoor areas are a point of habitation only during the period between April 15 and November 15. Property line: The real or imaginary line and its vertical extension which separates real prop- erty owned or controlled by any person from contiguous real property owned or controlled by another person and separates real property from the public premise. Supp. No. 16 Premise: Any building, structure, land, utility or portion thereof, including all appurtenances, and shall include yards, lots, courts, inner yards and real properties without buildings or improve- ments, owned or controlled by a person. Pure tone: A sound for which the sound pres- sure is a simple sinusoidal function of the time, and characterized by its singleness of pitch. Residentially used area: Any building or por- tion thereof designed or used exclusively for hu- man habitation, including single-family, two- family, and multiple-family dwellings without regard to their size or location within the city plus any area within five hundred (500) feet of such building or portion thereof which is so used. Residentially used area shall include any mixed use building which contains a dwelling unit as defined in section 522.40 of this Code plus any area within five hundred (500) feet of such dwell- ing unit. Residentially used area shall not be established by the locations of buildings which are principally hotels, motels, or rooming houses. Residentially zoned area: Any property or area which is located in a zoing district intended for any kind of residential use and with an "R" designation of any kind pursuant to the Minne- apolis Zoning Code and the associated official zoning map. Reverberation: The persistence of sound in an enclosed space, as a result of multiple reflections, after the sound source has stopped. Shielding: The attenuation of a sound, achieved by placing barriers between a sound source and the receiver. Sound: 1. An oscillation in pressure, stress, particle displacement, particle velocity, etc., in an elastic or partially elastic medium, or the superposition of such propagated alter- ations. 2. An auditory sensation evoked by the os- cillation described above. Not all sound waves can evoke an auditory sensation (e.g., ultrasound), 1654.3