EP 0258838 A3 19910123 - PROCESS FOR ACTUALIZING THE LOCAL TIME OF A USER OF AN INFORMATION TRANFER SYSTEM
Title (en)
PROCESS FOR ACTUALIZING THE LOCAL TIME OF A USER OF AN INFORMATION TRANFER SYSTEM
Publication
Application
Priority
DE 3629600 A 19860901
Abstract (en)
[origin: EP0258838A2] The time-of-day offset of the local time-of-day clock (3), consisting of an oscillator (4) and a time-of-day processor (5), of the user system (1) is determined with respect to a reference time-of-day clock (10) by means of a comparator (13). Together with the time-of-day data, which contain the instant of startup or the preceding comparison and are stored in an updating instant memory (6), and with the updated time-of-day data of the reference time-of-day clock (10), these time-of-day offset data are then fed to an evaluator (14) in which the mean frequency accuracy of the oscillator (4) in the time-of-day clock (3) of the user system (1) is determined and can then be used both to adjust the temporal offsets of the time-of-day comparison intervals and for a frequency retuning of the oscillator (4) in the user system time-of-day clock (3). The invention can be applied in spatially separated systems, especially mobile systems, controlled by the time of day, eg information transfer systems operating with encoding and having a temporally changed code. <IMAGE>
IPC 1-7
IPC 8 full level
G04G 5/00 (2013.01)
CPC (source: EP)
G04R 20/00 (2013.01)
Citation (search report)
- [A] US 4142069 A 19790227 - STOVER HARRIS A
- [A] US 3808365 A 19740430 - EHRAT K
- [A] US 4337463 A 19820629 - VANGEN ROBERT F
- [A] US 3026481 A 19620320 - BEESLEY JAMES P
- [A] PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 102 (P-448)[2159], 18. April 1986; & JP-A-60 236 088 (HITACHI) 22-11-1985
Designated contracting state (EPC)
BE DE FR GB IT NL
DOCDB simple family (publication)
DOCDB simple family (application)
EP 87112555 A 19870828