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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Noise reduction

Reducing the level of unwanted sound by any of several means of acoustical treatment.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

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.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Following the completion of pilot test, the subjects were tested with the sentences processed through the various noise reduction methods and the various intensity resolution values.
Figure 2 shows various nozzles with different noise reduction measures.
Mass Measurement after Noise Reduction. The test mass of 50 g weight was flown to the belt conveyor, and two signals, received signal before noise reduction and recovered signal after noise reduction, were compared as shown in Figure 9.
where SNR' stands for the signal to noise ratio after the spectral noise reduction. The index r combines two aspects of spectral details and approximation information to evaluate the effect of noise reduction, and it can make sure that the indexes of the two aspects are negatively correlated, so the greater the value of r, the better [9].
To explore influence rules of laying rate on noise reduction performance of MF acoustic blanket, numerical computation and analysis of noise reduction rules are conducted for 40 mm MF with five different laying rates (0%, 25%, 50%, 75%, and 100%).
Studying the effect of the frequency upshifting on the performance of various noise reduction methods is important since all cochlear implant users are affected by the spectral shift.
Environmental Methods for Transport Noise Reduction
If you think this is covered in an accompanying user's manual, it should be known that this guide goes beyond using controls to showing how every feature relates to the photo process, and includes the basics of stitching for panoramas, noise reduction, setup and shooting styles, and more.