Noncausal forward/backward two-pass IIR digital filters in real time

Authors : Adnane MOUFFAK, Mohamed Faouzi BELBACHIR

Pages : 769-786

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :A novel method for implementing noncausal forward/backward 2-pass recursive digital filters in real time is presented. It is based on a segment-wise block processing scheme without overlapping. Factors that degrade the linearity of the overall system`s transfer function are discussed. An analytical condition that corrects the system`s linearity is elaborated upon using the state variable approach. A recursive algorithm is developed to compute an implementable condition for real-time filtering. A single first in, first out queue memory is introduced to ensure an organized and continuous data stream into the proposed system. This technique allows real-time, sample-by-sample filtering, and it yields reduced delay and data storage memory compared to previous works. Better performances in total harmonic distortion were also obtained. Experimental results are illustrated.
Keywords : Noncausal filters, nonoverlapping approximation, real time filtering, segment wise processing