发明名称 |
CROSSTALK REDUCING DEVICE OF KEY TELEPHONE SET OR THE LIKE |
摘要 |
PURPOSE:To reduce crosstalk between extension telephone sets as much as possible by forming plural conductor layers on a mother substrate in different position relations at every attachment positions of plural LC substrates fitted to the mother substrate. CONSTITUTION:The conductor layers 12-15 formed on the mother substrate 11 are different in the position relation according to the attachment positions of the plural LC substrates 8a-8n attached to the substrate 11. Then, microcompters 10a-10n which control analog switches 9a-9n are connected to switches 9a-9n so that their address lines A-D correspond to the position relations of the conductor layers 12-15. This constitution reduces crosstalk between mutually close circuits and extension telephone sets greatly. |
申请公布号 |
JPS59200596(A) |
申请公布日期 |
1984.11.13 |
申请号 |
JP19830074390 |
申请日期 |
1983.04.26 |
申请人 |
MATSUSHITA DENKI SANGYO KK |
发明人 |
OKAMOTO TAKAO |
分类号 |
H04Q3/42;H04M3/18;H04Q1/16;H04Q3/58;H05K1/02;H05K1/14 |
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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