A single-ended noise reduction system is described, which is specifically intended to reduce background noise levels in automotive audio systems. The system described in this paper uses a combination of variable filtering and downward expansion in conjunction with a unique auto-threshold detector. This yields an effective 25 dB of improvement over FM radio, tape, and CD sources without the need for any manual adjustment.

Authors: Bowers, Derek F.; Waller, Jr., James K.
Affiliations: Analog Devices Inc., Santa Clara, CA ; Rocktron Inc., Rochester Hills, MI,(See document for exact affiliation information.)
AES Convention: 99 (October 1995) Paper Number: 4080
Publication Date: October 1, 1995
Subject: Signal Analysis and Noise Reduction

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