发明名称 |
ELECTRONIC HOLD CIRCUIT |
摘要 |
<p>IMPROVED ELECTRONIC HOLD CIRCUIT In a hold circuit connectable to a subscriber telephone line, a silicon controlled rectifier is turned on by a user operated momentary pushbutton connecting the positive side of the line to the hold circuit. A comparator circuit sensing the initial value of the loop voltage, turns on a transistor and connects a line seizing network across the subscriber line.</p> |
申请公布号 |
CA1205230(A) |
申请公布日期 |
1986.05.27 |
申请号 |
CA19830439992 |
申请日期 |
1983.10.28 |
申请人 |
GTE AUTOMATIC ELECTRIC INCORPORATED |
发明人 |
GRANTLAND, GARY;MONTGOMERY, HUGH S.;BOECKMANN, EDUARD F.B.;WOODWORTH, LARRY A. |
分类号 |
H04M1/80;H04M3/428;(IPC1-7):H04M1/00 |
主分类号 |
H04M1/80 |
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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