Patent · US Expired

Digital data slicer circuit for digital teletext signals

US4858007A · kind A · utility

3Cited by

3References

5Claims

0Family size

Assignee

Deutsche ITT Industries, GmbH · DE

Inventors

Reiner Schweer · Waldkirch, DE
Manfred Juenke · Gundelfingen, DE
Ulrich Sieben · Meßkirch, DE

Key dates

Filing date	Sep 6, 1988
Grant date	Aug 15, 1989
Priority date	—
Expiry date	Sep 6, 2008

Classification

Technology area (CPC H)Electricity
CPC primaryH04N7/0882
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A digital data slicer circuit causes the slicing level to track a teletext signal in optimum fashion even if the teletext signal has many successive zero crossings. The digital data slicer circuit substantially prevents any lock-in in either of two other, stable states. This is achieved essentially by applying a zero signal via two changeover switches to an accumulator and a sign inverter when many successive zero crossings are detected by a logic circuit that controls the changeover switches.

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