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:
Jun. 14, 2016
Filed:
Sep. 26, 2013
Motorola Solutions, Inc, Schaumburg, IL (US);
Cheah Heng Tan, Bayan Lepas, MY;
Friedrich J Bollmann, Birkenwerder, DE;
Teik Seng Saw, Sungai Petani, MY;
Peter William Hilding Svendsen, Virum, DK;
Kheng Shiang Teh, Bayan Lepas, MY;
MOTOROLA SOLUTIONS, INC., Schaumburg, IL (US);
Abstract
An intrinsically safe audio circuit and intrinsically safe portable two-way radio device meet conventional audio output requirements and intrinsically safe design limitations by separating the speaker coil of the device's speaker into separate coils to limit the energy storage possible in any one of the coils. Each separate coil is driven by one of several different audio power amplifiers that each output a substantially identical signal, and each of which are current limited.