All acoustical terminology shall be interpreted in accordance with
that contained in ANSI S1.1, Acoustical Terminology.
ANSI
American National Standard Institute, or its successor.
DAYTIME
7:00 a.m. to 9:00 p.m., prevailing time.
DECIBEL (dB)
A unit of sound level which is a division of a logarithmic
scale used to express the ratio of sound pressure of the source to
the pressure of an arbitrarily chosen reference pressure; the ratio
is expressed on the decibel scale by multiplying its base 10 logarithm
by 20.
EXCESSIVE NOISE
Excessive noise is that sound or sounds which are: 1) injurious
to, or which unreasonably interfere with, the comfortable enjoyment
of life and property; further, measured noise levels in excess of
limits established in these regulations or those specified in a valid
permit are declared to be excessive noise; 2) annoying to a person
of ordinary sensibilities.
NIGHTTIME
9:00 p.m. to 7:00 a.m., prevailing time.
NOISE
Any sound emitted by a person, animal, appliance, machine,
equipment, instrument or other device.
NOISE LEVEL
Airborne sound levels expressed in dB and obtained by the
use of specific frequency-dependent weighting networks, as specified
in the referenced standards and indicated by proper notation; if "A"
weighting is employed, the sound level is identified as dB(A).
NOISE POLLUTION
Noise of such loudness and character from a single source
or from one or more sources which is injurious to the public health,
safety or welfare or which is injurious to the health of one or more
persons in Perkiomen Township, or noise which unreasonably interferes
with the enjoyment of public or private property or with any business,
commercial or other lawful activity. Noise/sound pressure levels exceeding
those permitted in any zoning district shall constitute noise pollution.
PERIOD OF OBSERVATION
The time interval during which acoustical data are obtained.
The period of observation is determined by the characteristics of
the noise being measured and the instrumentation being used. The period
of observation must be at least as long as the response time of the
instrumentation. The greater the variance in individual sound level,
the longer must be the observation time for a given expected accuracy
of measurement.
PERSON
Includes an individual, firm, association, organization,
partnership, trust, company, corporation or any other similar entity.
SOUND-LEVEL CALIBRATOR
An instrument used to ensure that a sound-level meter is
accurately reading sound levels, including but not limited to the
Extech Sound-Level Calibrator, Model 40772, or any equivalent product,
used in accordance and compliance with the manufacturer's instructions
for said instrument.
SOUND-LEVEL METER
An instrument or combination of instruments capable of measuring the noise limits identified in §
193-6 below with accuracy, including but not limited to the Extech Digital Sound-Level Meter, Model 407732, or any equivalent product, which shall be used in accordance and compliance with the manufacturer's instructions for said instrument.
VEHICLE
Any device or machine used for, or capable of being used
for, transporting persons, property or cargo. Vehicles include, but
are not limited to, automobiles, trucks, trash collection trucks,
buses, motorcycles, motorized bicycles, snowmobiles, scooters, all-terrain
vehicles, go-carts, farm machinery, industrial machinery, highway
graders, trailers, graders and semitrailers.
TOWNSHIP
Township of Perkiomen, Montgomery County, Pennsylvania.