Bit synchronization method for a digital radio telephone system
US4803726A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1986 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | Dec 31, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/80
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and means for maintaining continuous bit synchronization of data transmitted from a remote unit through a base unit to a landline unit is disclosed. An input data stream at a first bit rate, such as digitized or encrypted speech, is interleaved with a plurality of signalling words, and transmitted over an RF channel at a second bit rate. The base site recovers the clock of the received data, strips off the signalling word, modifies the bit rate of the received data, and adjusts the recovered clock rate to provide an output data stream which is in bit synchronization with the input data stream and within a predetermined modem specification. The encrypted data is then sent over landlines to a decryption unit which requires bit synchronization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.