Adaptive video signal noise reduction system

Details Adaptive video signal noise reduction system Adaptive video signal noise reduction system

H - Electricity

04

N

H04N 5/21 (2006.01)

Patent

CA 2067246

A video signal transmission system includes. adaptive compansion circuitry to improve the signal-to-noise ratio of transmitted signals. A compandor (510) at the transmitter, and corresponding inverse compandor (600) at the receiver, are arranged to have a plurality of selectable compansion transfer characteristics. Selection (530, 660) of particular ones of the transfer characteristics is responsive to, e.g., predicted values (550, 570, 630, 640) of current signal.

Un système de transmission de signal vidéo comprend un circuit adaptif de compression-expansion destiné à améliorer le rapport signal-bruit de signaux transmis. Un compresseur-expanseur (21) situé au niveau de l'émetteur, ainsi qu'un compresseur-expanseur (600) inverse correspondant situé au niveau du récepteur, sont agencés pour avoir une pluralité de caractéristiques de transfert de compression-expansion pouvant être sélectionnées. La sélection (530, 660) de caractéristiques de transfert particulières est sensible, par exemple, à des valeurs prédites (550, 570, 630, 640) de signal de courant.

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