System and method employing a reduced nco lookup table

Details System and method employing a reduced nco lookup table System and method employing a reduced nco lookup table

H - Electricity

04

L

H04L 27/26 (2006.01) H03B 21/02 (2006.01) H03B 28/00 (2006.01)

Patent

CA 2338556

A system and method for reducing the computational complexity of the calculations performed by a Numerically Controlled Oscillator (NCO) (340). Through exploitation of mathematical symmetries and other techniques, the size of a lookup table (355) of sinusoidal values employed by the NCO (340) to approximate sinusoids may be reduced by the combination of different frequency shifts (510, 520).

L'invention concerne un système et un procédé de réduction de la complexité algorithmique des calculs effectués par un oscillateur à commande numérique (NCO) (340). Grâce à l'exploitation de symétries mathématiques et à d'autres techniques, on peut réduire la taille d'une table (355) de recherche de valeurs sinusoïdales utilisée par le NCO (340) pour obtenir une approximation de sinusoïdes, en combinant différents déplacements de fréquences (510, 520).

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