Robert J Collier

US Patent:

6741707, May 25, 2004

Filed:

Jun 22, 2001

Appl. No.:

09/887942

Inventors:

Laura R. Ray - Hanover NH
David A. Cartes - Tallahassee FL
Robert Douglas Collier - Lebanon NH

Assignee:

Trustees of Dartmouth College - Hanover NH

International Classification:

A61F 1106

US Classification:

381 7111, 381 716

Abstract:

A method to automatically and adaptively tune a leaky, normalized least-mean-square (LNLMS) algorithm so as to maximize the stability and noise reduction performance in feedforward adaptive noise cancellation systems. The automatic tuning method provides for time-varying tuning parameters and that are functions of the instantaneous measured acoustic noise signal, weight vector length, and measurement noise variance. The method addresses situations in which signal-to-noise ratio varies substantially due to nonstationary noise fields, affecting stability, convergence, and steady-state noise cancellation performance of LMS algorithms. The method has been embodied in the particular context of active noise cancellation in communication headsets. However, the method is generic, in that it is applicable to a wide range of systems subject to nonstationary, i. e. , time-varying, noise fields, including sonar, radar, echo cancellation, and telephony.

US Patent:

7092853, Aug 15, 2006

Filed:

Oct 25, 2002

Appl. No.:

10/280565

Inventors:

Robert D. Collier - Lebanon NH, US
Douglas A. Fraser - Meriden NH, US
Kenneth Kaliski - Thetford VT, US
G. Ayorkor Mills-Tettey - Hanover NH, US
Efrosyni Seitaridou - Northampton MA, US

Assignee:

The Trustees of Dartmouth College - Hanover NH

International Classification:

G06F 7/40

US Classification:

702195, 702182, 702183, 702190

Abstract:

A continuous environmental noise level recording and analysis system is provided. The system is capable of sampling, processing and storing Equivalent Sound Level values over a period of about two weeks. The recorded data is downloaded and analyzed to show graphs, and to automatically detect noise events of interest. The measurement system conforms to ANSI/IEC Type I or Type II standards for noise level monitoring.

US Patent:

55099408, Apr 23, 1996

Filed:

Oct 27, 1994

Appl. No.:

8/330217

Inventors:

Jack J. Zbar - Marietta GA
Robert B. Collier - Cohutta GA
Philip G. Carlson - Dalton GA

Assignee:

Arrow Engineering, Inc. - Dalton GA

International Classification:

C09B 6700
D06P 116
D06P 326
D06P 354

US Classification:

8617

Abstract:

The present invention provides a process for dyeing hydrophobic polymer fibers, including the step of contacting the goods with an amount of a dyeing solution effective to dye the goods, wherein the solution comprises an amount of a terpene/terpenoid solvent and a dyestuff. The present invention also provides a composition for dissolving and dispersing a dyestuff for dyeing hydrophobic polymer fibers, including effective amounts of a terpene/terpenoid solvent for dissolving the dyestuff.