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:
Sep. 17, 2019
Filed:
Mar. 09, 2017
Incus Laboratories Limited, Buckinghamshire, GB;
Alastair Sibbald, Buckinghamshire, GB;
Peter John McCutcheon, Buckinghamshire, GB;
Robert Alcock, Buckinghamshire, GB;
INCUS LABORATORIES LIMITED, Buckinghamshire, GB;
Abstract
An active noise-reduction headphone arrangement has a housing bearing a loudspeaker having a first diaphragm surface coupled to a first volume of air bounded by and coupled to a user's ear, and a second diaphragm surface bounding a cavity within the housing assembly so as to define a second volume of air, rearward of the diaphragm; a conduit provided in the housing, the conduit being in fluid communication the ambient air via a first acoustic couple means having a first characteristic acoustic impedance, the conduit also being in fluid communication with said second volume of air via a second acoustic couple means having a second characteristic acoustic impedance; and a microphone having an inlet coupled acoustically to a predetermined location within the conduit.