Tuning circuit for high frequency receiving apparatus with residual sideband modulation, especially for television receivers

US4195314A · kind A · utility

Assignee

• Licentia Patent-Verwaltungs-GmbH · DE

Inventors

• Willy Minner · Schwaigern, DE
• Paul Sieber
• Ibolya Haraszti · Heilbronn, DE

Key dates

• Filing date: Apr 21, 1978
• Grant date: Mar 25, 1980
• Expiry date: Apr 21, 1998

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03J5/0263
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A tuning circuit for tuning a high frequency receiving apparatus with residual sideband modulation, especially a television receiver, with a counter for forming encoded values of tuning voltage, with a store for the digital storing of the encoded values of tuning voltage, with a D/A converter for generating the analog tuning voltages from the encoded values and with a circuit for automatic fine tuning to the required position of a received transmitter. In such tuning circuit means are provided which so alter the value of the tuning voltage before or during writing into the store or after or during reading out from the store that this value corresponds not to the required tuning position but to a tuning position shifted into the fully transmitted sideband. The exact tuning ot the transmitter to the required position is effected by the circuit for fine tuning.