发明授权
- 专利标题: Two wire autobias vehicular microphone system having user input functionality and method of forming same
- 专利标题(中): 具有用户输入功能的二线自动车辆话筒系统及其形成方法
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申请号: US13003929申请日: 2009-07-20
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公开(公告)号: US08675889B2公开(公告)日: 2014-03-18
- 发明人: Robert R. Turnbull , Alan R. Watson
- 申请人: Robert R. Turnbull , Alan R. Watson
- 申请人地址: US MI Zeeland
- 专利权人: Gentex Corporation
- 当前专利权人: Gentex Corporation
- 当前专利权人地址: US MI Zeeland
- 代理机构: Price Heneveld LLP
- 代理商 Scott P. Ryan
- 国际申请: PCT/US2009/051151 WO 20090720
- 国际公布: WO2010/021803 WO 20100225
- 主分类号: H04B1/00
- IPC分类号: H04B1/00
摘要:
An autobias vehicular microphone system (300) includes a microphone (301) which 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 a voltage reference (303). The voltage reference (303) operates to provide an autobias to the amplifier (306) 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 (307, 309, 311) using the microphone (301). Additionally, one or more switches can be used to vary the bias point which can be interpreted to control functionality of the electronic devices (307, 309, 311).
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