H - Electricity – 04 – B
Patent
H - Electricity
04
B
379/3
H04B 3/54 (2006.01) H04M 11/00 (2006.01)
Patent
CA 1044388
ABSTRACT The master unit of an intercom in a building includes a digital code selector operating a digital coder for transmission of remote unit identification code signals to interoom receivers of several remote units for alerting persons at such respective units. Each remote unit includes a receiver for receiving both conversation transmission and an indentification code signal, reference signal means and a signal comparator for comparing identification code signals received by its receiver with its reference code signal. Reception by a remote unit of the appropriate identification code signal conditions its receiver to produce an audible call or alerting signal as the result of an electronic call signal received from the transmitter of the master unit by the receiver of that remote unit. The call signal is generated electronically and supplied to the transmitter of the master unit for transmission to all of the remote units. The conversation transmission, the identification code signals and the electronic call signals are all transmitted over the conventional electrical power wiring of the building.
259716
Bond Leland R.
Hymer John W.
Moore Robert F.
Moore Robert F.
Moore William B.
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