Anti-ringing device for television transmission system

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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358167, H04N 514

Patent

active

049857711

ABSTRACT:
An anti-ringing device for a television signal transmission system in which the frequency band of a luminance component of a video signal from an image device is limited to prevent visible ringing at the receiver. The device includes a signal delay circuit 2 for delaying the video signal obtained by the image device, a low-pass filter 3 capable of changing the frequency band limitation characteristics thereof, a discriminator 4 for providing an output when the luminance component of the video signal contains a source of ringing, and a switch 5 for normally connecting the output of the delay circuit to a signal processor 6. The switch is responsive to the output of the discriminator for connecting the low-pass filter to the signal processor instead of the delay circuit, whose delay time corresponds to the signal processing time required in the discriminator.

REFERENCES:
patent: 3333055 (1967-07-01), Krause
patent: 4130805 (1978-12-01), Mori et al.
patent: 4597007 (1986-06-01), Reitmeier et al.

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