Bit encoding in home control systems

Details Bit encoding in home control systems Bit encoding in home control systems

1997-06-12

1999-11-02

Lefkowitz, Edward

Communications: electrical

Systems

Selsyn type

34031002, H04M 1104

Patent

active

059778652

ABSTRACT:
A system for electronic communications using electrical power lines in a building includes a plurality of components that are connected for communications among themselves through the electrical power lines. A control transmitter is associated with at least one of the components for transmitting a data stream over the electrical power lines as a series of state changes. The data stream has a sequence of binary elements that each have one of two possible binary values. The control transmitter is configured to encode the binary elements as a series of three different state intervals on the transmission medium, depending on the value of the current binary element, the immediately preceding binary element, and the immediately following binary element. A control receiver is configured to decode the original data stream based on the state intervals. The encoding scheme allows a bit rate that is equal to the baud rate of the transmission medium.

REFERENCES:
patent: 4012704 (1977-03-01), Jagoda et al.
patent: 4357605 (1982-11-01), Clements
patent: 4633218 (1986-12-01), Palsgrove et al.
patent: 5018167 (1991-05-01), Perelman

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