Television scanning of motion picture films of different frame aspect ratios

US4476493A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Dieter Poetsch · Ober-Ramstadt, DE
• Volker Massmann · Mühltal, DE

Key dates

• Filing date: Apr 9, 1982
• Grant date: Oct 9, 1984
• Expiry date: Apr 9, 2002

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N9/11
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Horizontally compressed video signals sensed in film scanning are transmitted at a slower rate for time expansion while the beginning of the transmission of each line is electronically delayed by an amount, constant at least for each picture field, which determines the centering of the narrower picture to be transmitted by television. This processing can be done before digitalization of the picture for storage, in the read-out of semiconductor sensors or it can be done after digitalization either before or after picture storing or partly before or partly after. In a preferred form a complete Cinemascope frame is stored in the picture store and both the time expansion and the picture shift are provided in the read-out of the picture store.