EP 0273289 A2 19880706 - Bit synchronization method for a digital radiotelephone system.
Title (en)
Bit synchronization method for a digital radiotelephone system.
Title (de)
Verfahren zur Bitsynchronisation für ein digitales Funktelefonsystem.
Title (fr)
Procédé de synchronisation de bit pour système de radiotéléphone numérique.
Publication
Application
Priority
US 94819986 A 19861231
Abstract (en)
A method and means for maintaining continuous bit synchronization of data transmitted from a remote unit (114) through a base unit (126) to a landline unit (136) is disclosed. An input data stream (222) at a first bit rate, such as digitized or encrypted speech, is interleaved in a formatter (230) with a plurality of signalling words (234), and transmitted over an RF channel at a second bit rate. The base site decoder (250) recovers the clock of the received data, a reformatter (260) strips off the signalling word, and an elastic buffer (270) modifies the bit rate of the received data and adjusts the recovered clock rate to provide an output data stream (272) which is in bit synchronization with the input data stream and within a predetermined modem specification. The encrypted data is then sent over landlines (132) to a decryption unit (280) which requires bit synchronization.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
H04K 1/00 (2013.01 - EP US); H04L 9/0656 (2013.01 - EP US); H04L 9/12 (2013.01 - EP US); H04L 2209/80 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0273289 A2 19880706; EP 0273289 A3 19891018; US 4803726 A 19890207
DOCDB simple family (application)
EP 87118501 A 19871214; US 94819986 A 19861231