Patent · US Expired

Apparatus for updating time-of-day information in a signal

US4993003A · kind A · utility

110Cited by

7References

6Claims

0Family size

Assignee

Electronic-Werke Deutschland GmbH · DE

Inventors

Rainer Fechner · Villingen, DE
Thomas Bekesi · Niedereschach, DE

Key dates

Filing date	Aug 7, 1989
Grant date	Feb 12, 1991
Priority date	—
Expiry date	Aug 7, 2009

Classification

Technology area (CPC H)Electricity
CPC primaryH04N5/782
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A continuous time-of-day or date correction of a signal produced by a clock module is obtained from the data in a video-text or teletext signal that contains accurate time-of-day and/or date reference information. When the video-text/teletext data contain such reference information, the data of the output signal of the clock module are compared, on a continuous basis, with the received video-text/teletext. In case of a deviation between the clock module data and the reference information, a correction signal is applied to the clock module and corrects the clock module.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.