Patent · US Expired

Tracking error recognition in reproduced digital signals

US4578719A · kind A · utility

1Cited by

3References

3Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Jurgen Heitmann · Zwingenberg, DE
Rolf Loos · Eppertshausen, DE
Peter Wagner · Reno, US

Key dates

Filing date	Dec 6, 1984
Grant date	Mar 25, 1986
Priority date	—
Expiry date	Dec 6, 2004

Classification

Technology area (CPC G)Physics
CPC primaryG11B5/588
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A conventional multiple recognition unit provides a multiple error signal whenever digitally coded television signals supplied in successive data blocks to the error recognition unit finds by reference to check-words that the error correction capabilities of the unit are exceeded in any data block. In order to determine when such multiple errors are related to faulty tracking, the multiple error signals are prolonged in duration, overlaps between the multiple error signal and a preceding prolonged signal are detected, and the latter are then integrated. The level of the integrated signal determines the likelihood or presence of tracking error.

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