发明授权
- 专利标题： Duplex hands-free communications circuit
- 专利标题（中）： 双工免提通信电路
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申请号： US807596申请日： 1985-12-11
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公开(公告)号： US4726062A公开(公告)日： 1988-02-16
- 发明人: Donald Martz , Robert D. Talbot
- 申请人： Donald Martz , Robert D. Talbot
- 申请人地址： FL Melbourne
- 专利权人： Harris Corporation
- 当前专利权人： Harris Corporation
- 当前专利权人地址： FL Melbourne
- 主分类号： H04B3/20
- IPC分类号： H04B3/20 ; H04M9/10
摘要：
A circuit for reducing the effect of acoustic and electrical feedback in duplex "hands free" telephone sets. The circuit uses relatively simple and inexpensive gain control circuits and expanders to reduce the effects of feedback by controlling the gain of a transmitted signal in inverse relationship to the strength of a the received signal.
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