Video processing and method for converting video signals

Details Video processing and method for converting video signals Video processing and method for converting video signals

H - Electricity

04

N

H04N 7/01 (2006.01) H04N 7/015 (2006.01) H04N 7/26 (2006.01)

Patent

CA 2182277

A method for converting between relatively close field rates of perhaps 60 Hz and 59.94 Hz, monitors the phase difference between input and output field rates. Initially, output fields are created by synchronising input fields. As the measured phase passes a threshold, the method switches to interpolation mode for a short, fixed interval and then returns to synchronisation. The method offers much of the sharpness associated with simple synchronisation but avoids the visible discontinuities of field drops or repeats.

Un procédé de conversion entre des fréquences de trame d'environ 60 et 59,94 Hz, contrôle la différence de phase entre les fréquence de trame d'entrée et de sortie. Initialement, les trames de sortie sont créées par synchronisation des trames d'entrée. Lorsque la phase mesurée dépasse un certain seuil, le procédé passe en mode d'interpolation pendant un court intervalle de temps fixe et retourne ensuite à la synchronisation. Ce procédé permet d'assurer la même finesse qu'avec une synchronisation simple tout en supprimant les discontinuités visibles des affaiblissements ou répétitions de trames.

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