发明名称 |
Annunciator |
摘要 |
An annunciator is disclosed which has an improved charging circuit for storing the energy of a ring signal received via an improved Schottky diode bridge rectifier, and an oscillator-driven variable divider which actuates an audible output device when the stored charge exceeds a threshold level.
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申请公布号 |
US4346265(A) |
申请公布日期 |
1982.08.24 |
申请号 |
US19790104332 |
申请日期 |
1979.12.17 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
BUSS, KENNETH G.;CULP, NORMAN L. |
分类号 |
H04M1/00;H04M19/04;(IPC1-7):H04M1/00 |
主分类号 |
H04M1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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