The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 12, 1995
Filed:
Jan. 31, 1994
Applicant:
Inventor:
Graham P Eatwell, Caldecote, GB;
Assignee:
Noise Cancellation Technologies, Inc., Linthicum, MD (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03B / ;
U.S. Cl.
CPC ...
381 71 ; 381 94 ;
Abstract
An active control system for multiple interacting channels to control a constant noise or vibration consisting of first and second sensor means adapted to provide reference and residual signals respectively, a first and second filter means and first and second subtraction means to provide first and second output control signals and means for combining said output signals.