Compensation for the effects of the D/A converter in recursive digital filters

A compensation technique is described, whereby the transfer-function coefficients of a given recursive digital filter can be adjusted by means of an optimisation algorithm, so as to compensate for the amplitude distortion introduced by a D/A convertor. The technique has been used to design a lowpass, a highpass, a bandpass and a bandstop filter. The results show that stable compensated digital filters can be designed which satisfy prescribed specifications.