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:
Feb. 05, 2013
Filed:
Feb. 16, 2007
Ching Shyu, San Jose, CA (US);
Robert Bernardi, Scotts Valley, CA (US);
Robert Khamashta, Los Gatos, CA (US);
Ching Shyu, San Jose, CA (US);
Robert Bernardi, Scotts Valley, CA (US);
Robert Khamashta, Los Gatos, CA (US);
Plantronics, Inc., Santa Cruz, CA (US);
Abstract
An acoustic signal level limiter provides a telephone handset/headset user with protection against loud audible signals generated within a communications system. The acoustic signal limiter comprises an acoustic signal level attenuation circuit and at least one acoustic signal level relay circuit. Once activated, the acoustic signal level attenuation circuit creates an attenuation network that attenuates an electrical acoustic signal transmitted through the communications system. Additional acoustic signal level relay circuits are activated to further attenuate the electrical acoustical signal to prevent the acoustic signal level attenuation circuit from operating in a deep saturation mode and provide further hearing safety for the telephone headset/handset user. A fuse in series and 'Zener Zap' shunting transistor diodes may provide additional failsafe protection.