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EP0148389A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Tuning system for a television receiver

Assignee: Deutsche Thomson Brandt GmbH
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Filing: 1984-11-27
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Granted: —
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Expires: 2004-11-27
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Abstract

Abstract Translated from German @ Automatisches Abgleichsystem für Nachrichtenempfangsgeräte. Die einzelnen HF-Filter werden durch Anlegen einer Hilfsfrequenz an den Antenneneingang nacheinander abgeglichen. Die Frequenz liegt zwischen Bild- und Tonträger des gewählten Kanals. Die sich bildende Zwischenfrequenz liegt im Zwischenfrequenzbereich zwischen Bild-und Ton-ZF. Am AGC-Ausgang des ZF-Verstärkers wird die Meßspannung abgenommen. Der Referenzkreis wird in der Frequenz umgeschaltet auf die Zwischenfrequenz während des Abgleichs. Der Kondensator am AGC-Ausgang wird währenddessen verkleinert. @ Automatic matching system for message receiving devices. The individual HF filters are compared one after the other by applying an auxiliary frequency to the antenna input. The frequency lies between the picture and sound carrier of the selected channel. The intermediate frequency that forms is in the intermediate frequency range between the picture and sound IF. The measuring voltage is taken at the AGC output of the IF amplifier. The frequency of the reference circuit is switched to the intermediate frequency during the adjustment. The capacitor at the AGC output is reduced in the meantime.

Inventors

  • 👤 Gerhard Maier

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-07 04:29
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02

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