Dual-frequency induction-keyed control circuit wit

专利名称：Dual-frequency induction-keyed control

circuit with keying network having variableresonant frequency

发明人：Carl E. Atkins申请号：US05/652465申请日：19760126公开号：US04106006A公开日：19780808

摘要：A dual-frequency keyable control circuit is triggered into providing an electricalcontrol output signal when two passive keying circuits, tuned to the correct radio

frequencies are brought close enough to a sensing element of the keyable control circuitto cause mutual influence between the passive keying circuits and the sensing element.

< P>When the keyable control circuit detects that modulation is present at both ratiofrequencies in sequence, it produces control signals which can unlock a door, actuate ordefeat an alarm, or perform other functions for which it is desired to require keycombinations to attain access.

申请人：WAGNER ELECTRIC CORPORATION

代理机构：Eyre, Mann, Lucas & Just

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