Active distortion cancelation of sinusoidal sources

The paper presents an on-line digital signal processing method for active cancelation of distortion of sinusoidal sources. Generation of a sinusoidal signal of several volts is a simple task, but many measurements need high voltage, current, or nonelectrical excitation. This signal conversion often leads to distortion. The proposed active distortion controller is a resonator-based observer which determines the harmonic content of the signal, and the distorting components are subtracted from the output signal. The paper introduces the controller design in details, and a practical example illustrates the effectiveness of the proposed method.