发明名称 |
Telephone switch hook interface circuit |
摘要 |
A switch hook interface circuit couples a subscriber telephone to a subscriber telephone line. This interface circuit comprises a source of an off-hook signal, having one state indicating an off-hook condition, and a second state indicating an on-hook condition. A circuit is coupled between the off-hook signal source and the subscriber telephone line which gradually increases the current drawn from the subscriber telephone line when the off-hook signal indicates an off-hook condition, and gradually decreases the current drawn from the subscriber telephone line when the off-hook signal indicates an on-hook condition.
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申请公布号 |
US5859906(A) |
申请公布日期 |
1999.01.12 |
申请号 |
US19960752298 |
申请日期 |
1996.11.19 |
申请人 |
THOMSON CONSUMER ELECTRONICS, INC. |
发明人 |
PITSCH, ROBERT ALAN;HAILEY, JAMES EDWIN |
分类号 |
H04M1/82;(IPC1-7):H04M1/00;H04M11/00 |
主分类号 |
H04M1/82 |
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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