In this title, the following terms have the meanings indicated. “Impulse sound” means a short burst of acoustical energy such as that produced by weapons fire, a punch press, or a drop hammer. A pressure time history of a single impulse includes a rapid rise to a maximum peak pressure followed by a somewhat slower decay, both occurring within 1 second. “Motor vehicle” has the meaning stated in § 11-135 of the State Transportation Article {“Maryland Vehicle Law”}. “Noise” means any steady-state or impulse sound that occurs on either a continuous or intermittent basis. “Peak pressure” is the sound level in decibels of an impulse sound measured with sound instrumentation that uses the flat response or linear scale. “Steady-state sound” means a periodic or random variation, with a duration of more than 1 second, in atmospheric pressure at audible frequencies. City Code, 1976/83, art. 11, §230 (parts) Ord. 99-548