Television sound receiving circuit for at least one sound channel contained in an RF signal

US4710814A · kind A · utility

Assignee

• Deutsche ITT Industries, GmbH · DE

Inventors

• Gerhard-Guenter Gassmann · Bad Wildbad, DE
• Hermannus Schat · Glückstadt, DE
• Herbert Elmis · Denzlingen, DE
• Bernd Novotny · Gundelfingen, DE
• Otmar Kappeler · Denzlingen, DE
• Dietmar Ehrhardt · Glückstadt, DE

Key dates

• Filing date: Aug 25, 1986
• Grant date: Dec 1, 1987
• Expiry date: Aug 25, 2006

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N5/60
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A television sound receiving circuit for at least one sound channel contained in an RF signal converts the transmitted or already down-converted television signal as a composite signal to the baseband in a single-sideband demodulator circuit using the "phasing method", separates the first sound channel, corresponding to a lower sideband, and the second sound channel, corresponding to an upper sideband, and produces first and second sound signals at the desired frequency by subsequent frequency demodulation. Also shown are the interfaces for possible digitization and an advantageous use of the interfaces in which picture and sound signals are digitized together. The data can be combined into a single data stream which can be transferred over a bus system and is separable into the individual components if required.