Path: utzoo!attcan!uunet!mcsun!ukc!edcastle!ngse18
From: ngse18@castle.ed.ac.uk (J R Evans)
Newsgroups: comp.dsp
Subject: Re: noise cancellation
Message-ID: <4637@castle.ed.ac.uk>
Date: 11 Jun 90 12:47:54 GMT
References: <595@mercury.iotek.UUCP> <791@anaxagoras.ils.nwu.edu> <170@locke.water.ca.gov>
Reply-To: ngse18@castle.ed.ac.uk (J R Evans)
Organization: British Geological Survey
Lines: 16

Most of the work I've seen on noise cancellation stems from the work of
Widrow and Hoff - the most widely quoted reference being

Widrow, B. et al. 1975 Adaptive noise cancelling: Principles and
Applications: Proc IEEE v63 1692-1716.

Widrow's method employs an adaptive filter within a control loop, such that
the filter parameters are modified to maximise the correlation between
the error signal 'removed' from noisy signal and some approximation to
the interfering noise (e.g. a microphone in the cockpit near the
driver's or pilot's head).  There have been some very neat variants on
this technique; some of them in areas far removed from this application,
and no doubt some of them the subject of patents or commercial secrecy. 
Is anyone out there aware of alternative approaches to the problem?

Russ