Alarm system audio interface tamper and state detection

Details Alarm system audio interface tamper and state detection Alarm system audio interface tamper and state detection

2008-03-24

2010-12-28

Swarthout, Brent (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S522000, C340S533000, C340S536000, C379S044000, C379S047000, C455S425000

Reexamination Certificate

active

07859406

ABSTRACT:
An alarm system comprises: an audio interface comprising: a microphone; a state sensor for sensing a state at the audio interface; a signal generator for generating an inaudible state signal indicative of the state; a multiplexer for combining an audio signal from the microphone and the state signal; a control panel for monitoring sensed conditions at the audio interface; a conductor interconnecting the audio interface to the control panel carrying audio signal and the state signal as combined from the audio interface to the control panel.

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