Communications: electrical – Systems – Selsyn type
Patent
1999-06-29
2000-11-07
Lefkowitz, Edward
Communications: electrical
Systems
Selsyn type
34031002, H04M 1104
Patent
active
061442917
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: 4012734 (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
patent: 5977865 (1999-11-01), Odinak et al.
Keam Nigel S.
Odinak Gilad
Ranta Craig S.
Lefkowitz Edward
Microsoft Corporation
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