| HUSHCORE™
Acoustical Products & Systems Technical Discussion |
Introduction Technical Discussion Product Data Section Summary Back Forward |
General
Information Terminology & Definitions Product Types Treatment Strategies Applications/Uses |
| What
Is Noise?
Noise is unwanted
sound which may be What Is Sound? Sound is defined as any pressure variation in air, water or other fluid medium which may be detected by the human ear. |
What
Are The Characteristics Of Sound? The two most important characteristics which must be known in order to evaluate the sound or noise are it’s amplitude and frequency. The amplitude or height of the sound wave from peak to valley determines the loudness or intensity. The wave length determines the frequency, pitch or tone of the sound. |
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How Are These Characteristics Expressed? |
| The frequency of sound is expressed in wavelengths per second or cycles per second CPS). It is more commonly referred to as Hertz. Low frequency noise is 250 Hertz (Hz) and below. High frequency noise is 2000 Hz and above. Mid-frequency noise falls between |
250 and 2000 Hz. The amplitude of sound is expressed in decibels (dB). This is a logarithmic compressed scale dealing in powers of 10 where small increments in dB correspond to large changes in acoustic energy. |
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Sound wavelengths
are the linear measurement of one full cycle of displacement where
the motion of air molecules is first compressed and then rarefield
or expanded. The wavelength is determined by the ratio of the
speed of sound to the frequency.
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Noise
and Vibration Control, Inc.
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1-610-863-6300
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