Burglar alarm using power cord to transmit signals and...

Details Burglar alarm using power cord to transmit signals and... Burglar alarm using power cord to transmit signals and...

2007-01-23

2007-01-23

Hofsass, Jeffery (Department: 2612)

Communications: electrical

Condition responsive indicating system

With particular coupling link

C340S538110, C340S538140, C340S538160, C340S426100

Reexamination Certificate

active

10975366

ABSTRACT:
A burglar alarm includes a main unit provided with a power supply voltage regulator circuit, a CPU circuit, an FET driving circuit, and an RLC oscillation circuit to convert digital code signals into analog signals, which are amplified and then carried via a power cord; and a decoding horn provided with a power supply voltage regulator circuit, a reference voltage circuit, an RLC oscillation circuit, a comparison circuit, a CPU circuit, and a horn voice driving circuit to decode and compare a received burglar-alarming signal and drive a horn to make vocal and sounding warnings. The burglar alarm is controlled via different frequencies that represent codes1and0,or a base frequency and different pulse widths representing codes1and0,so that the signals are carriable via the power cord without interference from noise on the power word.

REFERENCES:
patent: 4335381 (1982-06-01), Palmer
patent: 4741340 (1988-05-01), Batina et al.
patent: 5777544 (1998-07-01), Vander Mey et al.
patent: 6243413 (2001-06-01), Beukema
patent: 6407987 (2002-06-01), Abraham
patent: 6608555 (2003-08-01), Chang
patent: 6800867 (2004-10-01), Maier

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