Title :
Design of predictive IIR filters via feedback extension of FIR forward predictors
Author :
Ovaska, Seppo J. ; Vainio, Olli ; Laakso, Timo I.
Author_Institution :
Inst. of Intelligent Power Electron., Helsinki Univ. of Technol., Espoo, Finland
fDate :
10/1/1997 12:00:00 AM
Abstract :
Finite impulse response (FIR) predictors for polynomial signals and sinusoids are easy to design because of the available closed-form design formulae. On the other hand, those FIR predictors have two major drawbacks: the passband gain peak is usually greater than +3 dB, and a long FIR structure is needed to attain high attenuation in the stopband. Both of these characteristics cause severe problems, particularly in control instrumentation when the predictor operates inside a closed control loop. In this paper, we present a novel feedback extension scheme for FIR forward predictors. This extension makes it possible to easily design infinite impulse response (IIR) predictors with low passband ripple and high stopband attenuation. The new approach is illustrated with design examples
Keywords :
IIR filters; approximation theory; circuit feedback; circuit optimisation; delays; digital filters; minimisation; network synthesis; polynomials; prediction theory; transient response; 3 dB; FIR forward predictors; FIR structure; closed control loop; control instrumentation; delay effects; digital filters; feedback extension; feedback extension scheme; finite impulse response; high stopband attenuation; low passband ripple; optimisation; passband gain peak; polynomial approximation; polynomial signals; predictive IIR filters; sinusoids; Attenuation; Feedback; Finite impulse response filter; IIR filters; Passband; Polynomials; Predictive models; Process design; Signal design; Signal processing;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
