Invention Application
WO2009023703A2 AUTO BIAS MICROPHONE SYSTEM FOR USE WITH MULTIPLE LOADS AND METHOD OF FORMING SAME
审中-公开
用于多负载的自动偏置麦克风系统及其形成方法
- Patent Title: AUTO BIAS MICROPHONE SYSTEM FOR USE WITH MULTIPLE LOADS AND METHOD OF FORMING SAME
- Patent Title (中): 用于多负载的自动偏置麦克风系统及其形成方法
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Application No.: PCT/US2008/072981Application Date: 2008-08-13
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Publication No.: WO2009023703A2Publication Date: 2009-02-19
- Inventor: TURNBULL, Robert R.
- Applicant: GENTEX CORPORATION , TURNBULL, Robert R.
- Applicant Address: 600 North Centennial Street Zeeland, Michigan 49464 US
- Assignee: GENTEX CORPORATION,TURNBULL, Robert R.
- Current Assignee: GENTEX CORPORATION,TURNBULL, Robert R.
- Current Assignee Address: 600 North Centennial Street Zeeland, Michigan 49464 US
- Agency: DOLCE, Marcus, P.
- Priority: US11/837,563 20070813
- Main IPC: H04R9/08
- IPC: H04R9/08 ; H04R3/00
Abstract:
An autobias vehicular microphone system (300) includes a microphone (301) uses an amplifier (306) for amplifying an output of the microphone. A first feedback path (308) provides an amplifier output signal to the amplifier input for providing amplifier linearity and a second feedback path (305) is used for providing bias to an voltage reference (303). The voltage reference (303) operates to provide an autobias to the amplifier (306) based upon amplifier loading. Thus, a DC feedback loop works as an average voltage sensing circuit operating to center the amplifier (306) to an operating point near one half its supply voltage. By allowing the bias point to vary, a constant clip level can be maintained depending on varying load conditions of electronic devices (307, 309, 311) using the microphone (301).
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