发明名称 |
Impedance measurement in 4-wire to 2-wire converters |
摘要 |
An oscillating input signal is applied to the 4-wire input terminals which is monitored while the 4-wire output terminals and the 2-wire terminals are also monitored. This procedure is performed with a first known reference impedance connected across the 2-wire terminals and then repeated with a second reference impedance similarly connected. A plurality of input frequencies may be applied over the range of 400 Hz to 4000 Hz.
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申请公布号 |
US4602338(A) |
申请公布日期 |
1986.07.22 |
申请号 |
US19830528575 |
申请日期 |
1983.09.01 |
申请人 |
BRITISH TELECOMMUNICATIONS |
发明人 |
COOK, JOHN W. |
分类号 |
H04B1/58;H04M3/30;(IPC1-7):G01R27/14 |
主分类号 |
H04B1/58 |
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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