发明名称 |
Subscriber loop feed apparatus |
摘要 |
Telephone loop feed apparatus in which a hybrid couples audio signals to and from the subscriber loop and presents a high impedance to the loop relative to the loop impedance. DC power is coupled to the loop by matched resistors which determine the loop feed matching resistance. DC power is blocked from the hybrid to avoid saturation.
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申请公布号 |
US4197431(A) |
申请公布日期 |
1980.04.08 |
申请号 |
US19780947726 |
申请日期 |
1978.10.02 |
申请人 |
DIGITAL TELEPHONE SYSTEMS INC |
发明人 |
VIS, HERMAN |
分类号 |
H04M19/00;(IPC1-7):H04M19/08;H04B1/58 |
主分类号 |
H04M19/00 |
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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