Patent · US Expired

Apparatus for the digital generation of vertical synchronizing and field identification signals

US4858008A · kind A · utility

10Cited by

5References

10Claims

0Family size

Assignee

Deutsche ITT Industries, GmbH · DE

Inventors

Ulrich Sieben · Meßkirch, DE
Heinrich Schemmann · Villingen-Schwenningen, DE

Key dates

Filing date	Sep 26, 1988
Grant date	Aug 15, 1989
Priority date	—
Expiry date	Sep 26, 2008

Classification

Technology area (CPC H)Electricity
CPC primaryH04N5/06
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A circuit is arranged to derive the internal vertical synchronizing signals and field identification signals for a digital television signal. The circuit operates from the internal horizontal synchronizing signals and the separated external synchronizing signals and employs a sign inverter, an accumulator, an absolute value device, a comparator, a counter and AND gates, as well as an OR gate. These components, as coupled, produce the above-noted signals by digital generation and requires no subcircuits that are independent of the horizontal oscillator which horizontal oscillator is arranged in a phase lock loop.

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