Television receiver with a ghost detector

Details Television receiver with a ghost detector Television receiver with a ghost detector

1980-03-20

1981-06-23

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, H04N 521

Patent

active

042754208

ABSTRACT:
A television receiver is disclosed in which there are provided a television signal receiving circuit including RF and IF stages; a video detector connected to the television signal receiving circuits; an AGC circuit connected between the video detector and television signal receiving circuit for automatically controlling the gain of the latter, the AGC circuit having a predetermined time constant; and a ghost detector connected to the video detector for detecting a ghost signal during a certain period in a vertical blanking period of the video signal from the video detector. In this case, a switching device is provided for switching the AGC circuit at least during the certain period in the vertical blanking period such that the detected ghost level is not substantially influenced by the transient level change of the AGC circuit.

REFERENCES:
patent: 4127874 (1978-11-01), Iwasawa et al.

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