To begin a discussion on noise control, one must comprehend the basic terminology associated with this topic:
Sound Frequency (Hz) Noise Infra sound and ultrasound Decibel (dB) Noise level measurement Adding noise levels Octave band Sound transmission Resonance Sound reduction by distance Sound transmission loss (TL) Noise reduction (NR) Sound absorption
The Sound Factor!
Sound is produced when a source sets the air energy level nearest to it in a wave motion. The speed of sound is about 1116 feet per second or 340 meters per second in air. The speed of sound is however greater in liquids and solids; for example, 4,925 f/s in water and 16,417 f/s in steel.
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