DE4139494

Noise estimation circuitry for estimating the noise in a small number of horizontal scanning lines of a video signal includes a lowpass line comb filter responding to said video signal, but not to chrominance-descriptive components thereof. The video signal free from chrominance-descriptive componen...

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Bibliographische Detailangaben
Hauptverfasser:	WEDAM, WERNER F., LAWRENCEVILLE, N.J., US, ALTMAN, TED NORMAN, EAST WINDSOR, N.J., US, PATEL, CHANDRAKANT B., HOPEWELL, N.J., US, WECKENBROCK, HERMANN J., BORDENTOWN, N.J., US
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY PICTORIAL COMMUNICATION, e.g. TELEVISION
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Beschreibung
Zusammenfassung:	Noise estimation circuitry for estimating the noise in a small number of horizontal scanning lines of a video signal includes a lowpass line comb filter responding to said video signal, but not to chrominance-descriptive components thereof. The video signal free from chrominance-descriptive components is repeatedly sampled during the backporch interval of each horizontal scanning line, and the samples are accumulated to generate a revised noise estimate each successive horizontal scanning line.