Invention Grant
- Patent Title: Suppressing output offset in an audio device
- Patent Title (中): 抑制音频设备中的输出偏移
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Application No.: US12237786Application Date: 2008-09-25
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Publication No.: US08503695B2Publication Date: 2013-08-06
- Inventor: Uma Chilakapati , Seyfollah Bazarjani , Joseph Fitzgerald , Guoqing Miao , Hui-Ya Nelson , Khalid Sidiqi , Jeffrey Hinrichs
- Applicant: Uma Chilakapati , Seyfollah Bazarjani , Joseph Fitzgerald , Guoqing Miao , Hui-Ya Nelson , Khalid Sidiqi , Jeffrey Hinrichs
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Espartaco Diaz Hidalgo
- Main IPC: H04B15/00
- IPC: H04B15/00

Abstract:
A digital offset is combined with an audio signal in the digital domain to cancel an output offset caused by one or more analog components processing the same audio signal. In this manner, the offset at the output of the audio signal path (e.g., at a power amplifier output) is reduced or eliminated. Consequently, audible artifacts, such as click-and-pop artifacts, can be reduced or eliminated. In audio devices operating in ground-referenced capless mode, power consumption is reduced because of reduced or eliminated direct current (DC) leakage current through speakers or headsets of such audio devices. In some circumstances, the digital offset in the digital domain may be applied at substantially all times of operation of the audio signal path.
Public/Granted literature
- US20090103750A1 SUPPRESSING OUTPUT OFFSET IN AN AUDIO DEVICE Public/Granted day:2009-04-23
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