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:
Mar. 18, 2014
Filed:
Jul. 20, 2009
Robert R. Turnbull, Holland, MI (US);
Alan R. Watson, Buchanan, MI (US);
Robert R. Turnbull, Holland, MI (US);
Alan R. Watson, Buchanan, MI (US);
Gentex Corporation, Zeeland, MI (US);
Abstract
An autobias vehicular microphone system () includes a microphone () which uses an amplifier () for amplifying an output of the microphone. A first feedback path () provides an amplifier output signal to the amplifier input for providing amplifier linearity, and a second feedback path () is used for providing bias to a voltage reference (). The voltage reference () operates to provide an autobias to the amplifier () based upon amplifier load-ing. By holding the bias point to a constant voltage, a constant clip level can be maintained depending on varying load conditions of electronic devices () using the microphone (). Additionally, one or more switches can be used to vary the bias point which can be interpreted to control functionality of the electronic devices ().