Television transmission system including encoder and decoder compatible with current television standards having a 4:3 aspect ratio

US5208668A · kind A · utility

Assignee

• Telefunken · DE

Inventors

• Siegfried Dinsel · Hersbruck, DE
• Werner Habermann · Hersbruck, DE

Key dates

• Filing date: Jul 24, 1991
• Grant date: May 4, 1993
• Expiry date: Jul 24, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S348/913
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A television transmission system compatible with current television standard includes a compatible wide aspect ratio television signal containing vacated spatial areas along upper and lower edges of an image defined by lines remaining after lines are separated from groups of successive lines within an image scanning interval. The separated lines are inserted into the vacated spatial areas. A first carrier is modulated with non-active portions of the separated lines, and with the remaining lines. A second carrier is modulated with time expanded active image portions of the separated lines, and is disposed in an upper portion of the television signal frequency spectrum so as to be suppressed in a standard aspect ratio receiver.