| 发明名称 |
LOOP DETECTION CIRCUIT |
| 摘要 |
PURPOSE:To reduce the number of adjusting points and to make easy the setting of the sensitivity to be detected, by using photocouplers of the like in a telephone exchanger. |
| 申请公布号 |
JPS53113407(A) |
申请公布日期 |
1978.10.03 |
| 申请号 |
JP19770028307 |
申请日期 |
1977.03.15 |
| 申请人 |
FUJITSU LTD |
发明人 |
HARADA HIDEMI;ISHIDA MORIYOSHI;NAGAHAMA YASUTSUGU;MIYAZAKI YASUO |
| 分类号 |
H04Q3/42;H04M3/22;H04Q3/72 |
主分类号 |
H04Q3/42 |
| 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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