发明名称 |
Telephone system with controllable ringing voltage |
摘要 |
A telephone system includes a controllable ringing generator for generating a ringing signal and an interface for providing a ringing voltage derived from that signal on the transmission line. The controllable ringing generator includes a control device for controlling the ringing voltage in response to the ringing current.
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申请公布号 |
US2003064760(A1) |
申请公布日期 |
2003.04.03 |
申请号 |
US20020218987 |
申请日期 |
2002.08.14 |
申请人 |
CANELLA ALBERTO;NOESSING GERHARD |
发明人 |
CANELLA ALBERTO;NOESSING GERHARD |
分类号 |
H04M19/02;(IPC1-7):H04M1/00;H04B1/38 |
主分类号 |
H04M19/02 |
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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