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Convention Paper Open Access

An Audio Noise Reduction System

Authors: Dolby, Ray

AES Convention 33 · Paper 543 · October 1967

Abstract

A noise reduction system which is suitable for use with high quality audio recording or transmission channels is described. A special signal component, derived from four band splitting filters and low level compressors, is combined with the incoming signal during recording or sending. During reproduction, the additional component is removed in a complementary way; any noises acquired in the channel are attenuated in the process. Practical features of the system include: 10 dB (unweighted) noise reduction; imperceptibility of signal modulated noise effects; level frequency response (overall); accuracy of reproduced signal dynamics; low distortion; low internal noise level; stability of characteristics.

Details

Published in
AES Convention 33
AES Convention
33
Paper number
543
Publication date
October 6, 1967
Affiliation
Dolby Laboratories, London, England (See document for exact affiliation information.)
Type
Convention Paper