Video recorder with a magnetic recording medium in the form of a tape

US4757390A · kind A · utility

Assignee

• Deutsche ITT Industries, GmbH · DE

Inventors

• Soenke Mehrgardt · Teningen, DE
• Heinrich Pfeifer · Denzlingen, DE
• Thomas Fischer · Umkirch, DE
• Peter M. Flamm · Glückstadt, DE

Key dates

• Filing date: Jul 30, 1985
• Grant date: Jul 12, 1988
• Expiry date: Jul 30, 2005

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N9/831
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

To raise the integration level of a video recorder, and to provide a uniform circuit concept suitable for all three color-television standard (PAL, NTSC, SECAM) which, in particular, requires only slight modifications for adaptation to the respective standard, signal processing is performed by fast digital circuits whose signals are stored on the recording medium not in digital form, but after digital-to-analog conversion. The composite color signal is converted into digital form by a fast analog-to-digital converter (aw) whose sampling signal (fc) has a fixed frequency (Fc) for all three color-television standards. Digital signal processing in the chroma channel is performed at a fixed subcarrier frequency (zt) for all three color-television standards which is an integral subharmonic of the sampling frequency (Fc).