Synchronization apparatus with variable window width and spacing at the receiver
US4196416A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 29, 1978 |
| Grant date | Apr 1, 1980 |
| Priority date | — |
| Expiry date | Nov 29, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C17/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A transmitter transmits a sequence of synchronization signals at a predetermined repetition rate and at least one synchronization signal at a spacing in time different from said synchronization signals to signify the start of the message. At the receiver, a window is generated and the locally generated synchronization signal is retimed every time a received synchronization signal falls outside of the window. The window is generated by a counter which controls a flip-flop. To compensate for jitter in the received synchronization signal and yet maintain the window as narrow as possible, the size of the window is decreased from a maximum at the beginning of the message and the position in time of the window relative to a center position at which a jitter-free synchronization pulse would be received is varied as a function of the number of received synchronization signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.