Modem for pseudo noise communication on A.C. lines
US4835517A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1984 |
| Grant date | May 30, 1989 |
| Priority date | — |
| Expiry date | Jun 20, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2203/5495
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A modem which may operate as a transmitter or receiver, is provided for use on a line carrying an A.C. signal. The modem comprises a pseudorandom code generator which produces a pseudorandom code signal of a frequency an integral multiple of the A.C. signal frequency. Synchronization means synchronizes the code signal with the A.C. signal. Preferably a coherent system is provided in which a data signal involved has a bit rate an integral multiple of the A.C. signal frequency and in which a carrier generator is additionally provided to produce a carrier signal of a frequency an integral multiple of the A.C. signal frequency. In such case, the synchronization means also synchronizes the data bit and carrier signals with the A.C. signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.