Bit encoding in home control systems
US6144291A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1999 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Jun 29, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2203/5437
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.