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:
Aug. 20, 2013
Filed:
Mar. 08, 2011
Joshua James Barr, Bangor, MI (US);
Medford Alan Dyer, San Diego, CA (US);
Alan Dean Michel, Fishers, IN (US);
Christopher Todd Welsh, Fishers, IN (US);
Joshua James Barr, Bangor, MI (US);
Medford Alan Dyer, San Diego, CA (US);
Alan Dean Michel, Fishers, IN (US);
Christopher Todd Welsh, Fishers, IN (US);
Harman International Industries, Inc., Stamford, CT (US);
Abstract
A passive sound pressure level (SPL) limiter is provided that can be used with audio sources of varying drive levels and headphones or earphones of varying sensitivity. The SPL limiter includes a control circuit and left and right channel limiting circuits, each of which includes a pair of FETS. The SPL limiter may include a balancing circuit that separates the control signal output by the control circuit into left and right channel control signals. The SPL limiter may also include a microphone, for example integrated into an earpiece cable.