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公开(公告)号：CA1261922A
公开(公告)日：1989-09-26
申请号：CA480611
申请日：1985-05-02
Applicant: IBM
Inventor： BONNET YVES A , JACQUART CHRISTIAN
Abstract: The circuit of the present invention detects variations of a current IL flowing in a telephone line LL. A low-value resistor r is connected in series with line LL. A constant voltage generator is connected across this resistor. The current Is applied to resistor r by the constant voltage generator varies as a function of IL. This being so, a measurement of the variations of Is will reflect variations of IL and, therefore, can be used to detect both amplitude and directional variations of IL.
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