Means for cancelling ghost signals in response to the reception

Details Means for cancelling ghost signals in response to the reception Means for cancelling ghost signals in response to the reception

1992-08-28

1994-05-03

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

H04N 521

Patent

active

053092260

ABSTRACT:
A ghost canceller for cancelling the ghost with dummy ghost signals opposite in characteristics to the ghost signals. Such dummy ghost signals are generated under control of tap gain controls signals and delay control signals generated by analysis of received TV video signals. The filter control circuit in the ghost canceller comprises a standard signal discriminator for discriminating whether the relationship among the subcarrier signal, and the vertical and horizontal synchronizing signals of the input video signal meets the above-mentioned standards or not; and a zero gain signal generator for otherwise setting the tap gain control signal of the ghost cancelling filter to the corresponding value to zero tap gain.
In virtue of this construction, the input of nonstandard TV signal unmeet for the standards results in zero tap gain of the transversal filter, and thus the input signal passes, as unaffected, through the ghost filter, and then outputted. In this may malfunction as occurrence of image distortion can be prevented and therefore clear pictures are obtained.

REFERENCES:
patent: 4953026 (1990-08-01), Kobayashi et al.
patent: 5065241 (1991-11-01), Isa
patent: 5170260 (1992-12-01), Tabata

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