Group delay reduction in FIR digital filters

  • Authors:

  • Boul Chandra Garai;Priyanka Das;Amit Kumar Mishra

  • Affiliations:

  • Department of Electronics and Communication Engineering, Indian Institute of Technology Guwahati, India;Department of Electronics and Communication Engineering, Indian Institute of Technology Guwahati, India;Department of Electronics and Communication Engineering, Indian Institute of Technology Guwahati, India

  • Venue:
  • Signal Processing
  • Year:
  • 2011

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Abstract

The causal delay of finite impulse response filters can be minimized by the use of recursive Minimum-phase filters, i.e., IIR filters. However, in IIR filters delay distortion arises which is undesirable. Many algorithms have been proposed, which try to attain both these goals, of minimizing causal delay and delay distortion, simultaneously. Usually for a long input sequence to be filtered, block convolution techniques are used such as overlap-save method (OSM) and overlap-add method (OAM). However, in these methods the output sequence has a finite group delay with respect to input. To reduce that group delay, in this paper, we have proposed the technique of enhanced modified overlap and save method. In our method, we first make the impulse response (IR) causal (i.e., h(n)=0 for n