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:
May. 10, 2016
Filed:
Oct. 07, 2013
Nuvoton Technology Corporation, Hsinchu, TW;
Peter J. Holzmann, San Jose, CA (US);
NUVOTON TECHNOLOGY CORPORATION, Hsin-Chu, TW;
Abstract
An integrated audio signal processing circuit is described for reducing crosstalk noise in an integrated headset switch for a headset having two speakers, a microphone sharing a common ground. The audio signal processing circuit includes two audio amplifiers and also has two terminals configured to be either a microphone connection terminal or a headset ground connection terminal, respectively, depending on the type of the headset. An audio amplifier reference node is coupled to inputs of the audio amplifiers. The audio signal processing circuit has a first switch device responsive to a headset ground selection signal and configured to connect the audio amplifier reference node to the detected headset ground connection terminal. The audio signal processing circuit also has a second switch device responsive to the headset ground selection signal and configured to couple the detected headset ground connection terminal to a ground terminal of the audio processing circuit.