Low frequency digital notch filter

Details Low frequency digital notch filter Low frequency digital notch filter

H - Electricity

03

H

328/0.5, 328/0.7

H03H 17/04 (2006.01) H03H 17/02 (2006.01)

Patent

CA 1288483

ABSTRACT A low frequency digital notch filter comprising two sub-filters - an all-pass-network filter and a T-section filter with a feedback connection from the T-filter to an input node, and feed forward connection from this input node to a terminal output node. The all-pass-network filter has a transform function:- A(Z) = [Z-1+K]/[1+K1Z-1]; and the T-section filter has throughput and tap transform functions:- B(Z)=[(K3+R2.K4)Z-1-1]/[1-K3Z-1] and, C(Z)=K2Z-1/[1 - K3Z-1], where Z-1 is the unit delay operator and K1 to K4 are multiplier coefficients. The T-section filter may be implemented using a combination of three multipliers and a delay element.

514260

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