Synchronized video/audio alarm system
DCFirst Claim
1. An alarm unit for use in an alarm system having a power source for providing a power signal to the alarm unit over a two-conductor power distribution line and an alarm control circuit for varying the power signal to the alarm unit in one or more predetermined patterns to control alarm unit operation, the alarm unit comprising:
- means connectable to said two-conductor power distribution line for receiving said power signal as the sole source of power for said alarm unit;
means for generating an audible alarm signal; and
means for detecting predetermined-pattern variations in said power signal and, in response thereto, for controlling the operation of said audible alarm generating means to generate an audible alarm signal without loss of power to said alarm unit.
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Abstract
An audio/visual alarm system which includes multiple microprocessor-controlled alarm units connected in a common loop to a fire alarm control panel and an interface control circuit. The interface control circuit causes brief interruptions in power to the alarm units which synchronize operation of the alarm units and which can also be used as alarm control signals. The interface control circuit allows for control of both audio and visual alarms using only the single common loop connection between alarm units.
69 Citations
11 Claims
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1. An alarm unit for use in an alarm system having a power source for providing a power signal to the alarm unit over a two-conductor power distribution line and an alarm control circuit for varying the power signal to the alarm unit in one or more predetermined patterns to control alarm unit operation, the alarm unit comprising:
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means connectable to said two-conductor power distribution line for receiving said power signal as the sole source of power for said alarm unit; means for generating an audible alarm signal; and means for detecting predetermined-pattern variations in said power signal and, in response thereto, for controlling the operation of said audible alarm generating means to generate an audible alarm signal without loss of power to said alarm unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification