Automatic frequency control by an adaptive filter

Details Automatic frequency control by an adaptive filter Automatic frequency control by an adaptive filter

H - Electricity

03

L

H03L 7/00 (2006.01) H03H 21/00 (2006.01) H03J 7/04 (2006.01)

Patent

CA 2089154

The process of the present invention generates an optimum automatic frequence control signal in an apparatus that has a plurality of adaptive algorithms, each adaptive algorithm having a reference signal with an associated frequency dither. The process starts by comparing the performance of each of the plurality of adaptive algorithms. This difference is input to a compartor (6) where it is compared to zero. This delta signal then modifies the numerically controlled oscillator frequency (8). After several iterations, the frequency offset is reduced to substantially zero.

Le procédé décrit par la présente invention consiste à produire un signal de contrôle automatique de fréquence optimale dans un appareil doté de plusieurs algorithmes adaptatifs, chacun ayant un signal de référence avec activation de fréquence associée. La première étape consiste à comparer la performance de chacun des algorithmes adaptatifs. Cette différence est introduite dans un comparateur (6), dans lequel elle est comparée à zéro. Ce signal delta modifie ensuite la fréquence (8) d'oscillateur contrôlée numériquement. Après plusieurs itérations, le décalage de fréquence est réduit pratiquement à zéro.

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