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:
May. 23, 1995
Filed:
Sep. 09, 1993
Applicant:
Inventor:
Larry J Eriksson, Madison, WI (US);
Assignee:
Digisonix, Inc., Middleton, WI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G10K / ;
U.S. Cl.
CPC ...
381 71 ;
Abstract
An active attenuation system has indirect error sensing. The invention operates in systems which attenuate an acoustic wave after the acoustic wave has propagated through and exited from a waveguide. Indirect error sensing is done by sensing the primary acoustic wave which is being attenuated while it is propagating through the waveguide, measuring a canceling acoustic wave while it is propagating in another waveguide, and by combining the measurements to generate an error signal corresponding to the error after the primary and canceling acoustic waves have combined in free space. Thus error measurements can be made without having exposed error sensors.