Noise trap arrangement for AC power line communication systems
First Claim
1. In a communication system operable to transmit encoded room status information and other data on neutral and ground lines included in an AC power line which also includes a hot line and which extends between separate areas in a building complex such as the rooms of a hotel, motel, or hospital, the improvement comprising noise trap means connected between the hot and neutral lines of the AC power line for attenuating noise on the hot and neutral lines.
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Accused Products
Abstract
A noise trap circuit which suppresses noise in a communication system of the type used in hotels and motels to transmit encoded communication signals such as room status information. The communication signals are transmitted on the neutral and ground lines of the AC power distribution network of the building. The noise trap circuit is an LCR circuit connected between the hot and neutral lines. The capacitor and inductor of the LCR circuit pass the communication signal band width, and the resistor has an impedance equal to the line impedance with the offending noise sources active. The communication system normally has a remote controller in each room of the building, and each remote controller is equipped with a noise trap circuit.
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Citations
10 Claims
- 1. In a communication system operable to transmit encoded room status information and other data on neutral and ground lines included in an AC power line which also includes a hot line and which extends between separate areas in a building complex such as the rooms of a hotel, motel, or hospital, the improvement comprising noise trap means connected between the hot and neutral lines of the AC power line for attenuating noise on the hot and neutral lines.
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7. In a communication system for transmitting encoded room status information and other data on neutral and ground lines included in an AC power line which also includes a hot line and which extends between separate areas of a potentially noisy building complex such as a hotel, motel, or hospital, the combination of:
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central processing equipment operable to transmit encoded signals thereon; a transceiver in each of said separate areas, each transceiver being operable to receive encoded signals on the neutral and ground lines from the central processing equipment and to transmit encoded signals to said equipment on the neutral and ground lines, whereby two-way communication is provided between said central processing equipment and each transceiver; and a noise trap for each transceiver connected between the hot and neutral lines of the AC power line and operable to attenuated noise on the hot and neutral lines. - View Dependent Claims (8, 9, 10)
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Specification