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:
Jan. 02, 1996
Filed:
Apr. 01, 1993
Applicant:
Inventors:
Graham P Eatwell, Cambridge, GB;
Andrew Langley, Herts, GB;
Assignee:
Noise Cancellation Technologies, Inc., Linthicum, MD (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G10K / ; H03G / ;
U.S. Cl.
CPC ...
381 71 ; 381 72 ; 381 74 ; 381103 ;
Abstract
An improved audio system designed to maintain a desired sound at the ear of a listener by using an equalization filter (2). The equalization filter (2) is continuously adjusted in response to the signal (9) from a sensor (8) which monitors the sound close to the listener's ear. The audio system can be combined with an active noise control system (3) to reduce interference from external noise.