Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Reexamination Certificate
2008-01-08
2008-01-08
Mei, Xu (Department: 2615)
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
C381S072000, C381S074000
Reexamination Certificate
active
07317802
ABSTRACT:
Active-noise-reduction (ANR) headsets protect the hearing of their users from loud persistent noises, such as airplane engines and construction equipment. These headsets generally include ear speakers and special circuitry to cancel or suppress certain types of loud persistent noises. One problem the present inventor recognized with active headsets, particularly those manufactured in mass quantities, concerns the performance variations that stem from inevitable variations in the fit of their earcups against heads of their users. For example, in putting on and taking off these headsets, some users experience low-pitched noises. Accordingly, the inventor devised, among other things, headsets that include front-cavity vents for equalizing the pressure between a front cavity portion of an earcup and an ambient environment.
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Drake Eduardo E.
LightSPEED Aviation, Inc.
Mei Xu
Schwegman Lundberg & Woessner, P.A.
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