Method and device for controlling the phase relation between a head drum and tape feed system of a magnetic tape recording device

US6389219B1 · kind B1 · utility

Assignee

• Deutsche Thomson-Brandt GmbH · DE

Inventors

• Jurgen Kaaden · Villingen-Schwenningen, DE
• Peter Mahr · Cochem, DE

Key dates

• Filing date: Mar 9, 1998
• Grant date: May 14, 2002
• Expiry date: Mar 9, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N5/783
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A method for controlling a phase relation between a head drum and a tape feed system, of a type wherein digital picture data is subdivided into blocks having an assigned pointer value each and wherein the pointer values define which part of the picture the block of picture data represents includes the steps of: incrementing or decrementing a location in a measured value with a corresponding pointer value with corresponding data block in a reproduced data stream, monitoring the content of the locations in the measured value store after a certain amount of reproducing time by means of determining the distance between pointer value regions which have been reproduced more often than the regions in-between, thereby taking into account the difference in reproducing frequency between the more often reproduced regions and the more seldom reproduced regions according to the measured value store entries, and determining a phase correction value for the control of the phase relation between the head drum and the tape feed systems based on the distance between pointer value regions.