Method and circuit arrangement for the memory-optimized processing of a composite video baseband signal CVBS signal

US6118487A · kind A · utility

Assignee

• Deutsche Thomson-Brandt GmbH · DE

Inventors

• Gangolf Hirtz · Niedereschach, DE
• Thomas Hollmann · Villingen-Schwenningen, DE
• Michael Maier · Villingen-Schwenningen, DE

Key dates

• Filing date: May 1, 1997
• Grant date: Sep 12, 2000
• Expiry date: May 1, 2017

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N11/167
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

For compatible transmission of a television picture having an aspect ratio of 16:9 within a 4:3 system, transmission is effected in the letterbox format in accordance with the PALplus system specification. The receiver reconstructs the original picture with the aid of vertical filters and is able, furthermore, to suppress crosstalk interference from the luminance signals in the chrominance signals. To further improve the picture quality, the picture is displayed at a frame frequency of 100 Hz. For this purpose, the picture supplied at 50 Hz with line interlacing must be converted to a frame frequency of 100 Hz. Known concepts for PALplus decoding and 100 Hz conversion carry out these processes separately and in doing so require a great deal of memory space. By virtue of the memory control according to the invention, in which a field is stored in different memory areas (M1, M2), successive lines of a field not being stored in successive address areas or only partially being stored in successive address areas, the PALplus decoding and simultaneous 100 Hz conversion are possible with two memory modules. As a result, a decoder with 100 Hz reproduction is possible with reduced costs.