Noise reduction

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noise reduction

[′nȯiz ri‚dək·shən]
(engineering acoustics)
A process whereby the average transmission of the sound track of a motion picture print, averaged across the track, is decreased for signals of low level; since background noise introduced by the sound track is less at low transmission, this process reduces noise during soft passages.

Noise reduction

Reducing the level of unwanted sound by any of several means of acoustical treatment.

noise reduction, NR

The difference in decibels between the average sound pressure levels produced in two rooms by a sound source in one of them.
References in periodicals archive ?
In Stage (I), the various noise reduction methods were implemented to produce the enhanced speech stimuli by using the three noise reduction methods namely spectral subtraction, MMSE spectral amplitude estimator and subspace noise reduction method.
A Spray Based Crumb Rubber Technology in Highway Noise Reduction Application, Rubber Pavements Association, 1999, Available from: http://www.
The CWM system basically can do a real-time noise reduction process based on the above theories by a combination of high-speed STFT and high-resolution WT.
The effectiveness of the ITH's active noise reduction technology was supported by a study completed in early December 2004 in the engineering psychology department of the U.
It will be up to regulations and the marketplace to decide when the technology is used before the noise reduction benefit is realized.
Abstract: A multifunctional thermochemically cured coating which provides noise reduction and weight reduction in combination with thermal insulating and corrosion resistant properties.
The community workshop to discuss noise reduction will be held at 7 p.
The noise output of the MCS 40 has been reduced from 69 to 62 dB and the MCS 50 from 73 to 64 dB, a perceived noise reduction of almost 50%.
Noise reduction work on a rumbling Teesside road will not happen until at least 2007.
With a Noise Reduction Rating (NRR) of 33, the red, white, and blue Super Leights provide the highest level of hearing protection available.
Wireless network operators must deal with an array of voice quality issues, and Ditech's SX-24 and SX-30 products provide an effortless and extremely cost-effective means of deploying advanced noise reduction and a whole host of voice enhancement technology into their networks," said Ray Caron, Ditech's Vice President of Marketing.