Time division multiplex system having transmitted pulses in time channels distributed over and co-transmitted with a frame clock signal component
US4414663A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 1980 |
| Grant date | Nov 8, 1983 |
| Priority date | — |
| Expiry date | Nov 5, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/0614
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a time division multiplex system having chronological grouping of optically transmittable PPM signals, the PPM signals of one half of the time channels are transmitted as pulses in one half of each pulse frame and the PPM signals of the other half of the time channels are transmitted as pulse pauses in the other half of each frame for the purpose of the co-transmission of a clock frequency component without providing a separate synchro time slot. For this purpose, PPM pulses are formed and transmitted only in one pulse frame half, while PPM pulses formed in the other pulse frame half are subtracted from a continuous signal corresponding in amplitude to the pulse amplitude, and the signal difference is transmitted. At the receiver, the frame clock component is filtered out by a band-pass filters and is exploited for controlling a receiving clock generator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.