Noise Reduction

The difference in sound pressure level between any two points along the path of sound propagation. As an example, noise reduction is the term used to describe the difference in sound pressure levels between the inside and outside of an enclosure.

There are a number of methods that may be employed to reduce noise. These will vary depending on the system that is generating the noise, the path taken from the source to the receiver and the environment in the receiving room. This follows the simple source-path-receiver model:

The optimum point at which to reduce the observed noise is at the source. However, in many cases this is not feasible for various reasons and so it is necessary to reduce the received noise by modifying the path.


ASTM E596 Laboratory Measurement of Noise Reduction of Sound-Isolating Enclosures

See also: Normalized Noise Reduction.

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Subjects: Noise & Vibration