Communications: electrical – Condition responsive indicating system – With particular coupling link
Reexamination Certificate
2011-07-19
2011-07-19
Pope, Daryl (Department: 2612)
Communications: electrical
Condition responsive indicating system
With particular coupling link
C340S003510, C340S505000, C340S514000, C340S506000, C340S511000
Reexamination Certificate
active
07982597
ABSTRACT:
A device and method for detecting current-impressed useful signals, added to a DC supply current, for a digital alarm line security system are described. To operate the alarm system using high DC supply currents on the alarm line without significantly affecting the reception of the useful signals, a current bypass branch containing a second current sensor element, a control amplifier, and an actuator for adjusting the resistance of the current bypass branch is provided in parallel to a first current sensor element designed for picking up the signals, the actuator being controlled by the control amplifier in such a way that a constant current adjusted to a setpoint value input at the control amplifier flows through the current bypass branch, the setpoint value being defined by a microprocessor as a function of time in such a way that the current flowing through the first current sensor element contains the useful signals having an essentially unreduced amplitude, and a reduced portion of the DC component of the supply current.
REFERENCES:
patent: 6583628 (2003-06-01), Ropke
patent: 27 55 826 (1979-06-01), None
patent: 100 48 599 (2002-04-01), None
Kenyon & Kenyon LLP
Pope Daryl
Robert & Bosch GmbH
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