For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
“A” WEIGHTING SCALE. The sound pressure level, in decibels, as measured with the sound level meter using the “A” weighted network scale. The standard unit notation is dB(A).
dB(A). The sound level in decibels, determined by the “A” weighting scale of a standard sound level meter having characteristics defined by the American National Standards Institute, Publication ANSI, 1.4-1983, for a type 2 instrument.
DECIBEL (dB). A unit of measure, on a logarithmic scale, of the ratio of the magnitude of a particular sound measure to a standard reference pressure.
NOISE. An unwanted or disturbing sound.
ORDINARY SENSIBILITIES. To have normal bodily faculties of perception or feeling without the aid or assistance of a mechanical or external device.
PLAINLY AUDIBLE. Any sound that can be detected by a person using his or her unaided hearing faculties.
SOUND LEVEL. In decibels, a weighted sound pressure level determined by the use of a sound level meter whose characteristics and frequency weightings are specified in ANSI standards.
SOUND LEVEL METER. An instrument which includes a microphone, amplifier, RMS detector, integrator of time average, output meter, and weighting network used to measure sound pressure levels.
(Ord. passed 6-17-2013)