Simulation of frequency response masking approach for FIR filter design

  • Authors:

  • Usman Ali;Shahid A. Khan

  • Affiliations:

  • Department of Electrical Engineering, COMSATS Institute of Information Technology, Abbottabad, Pakistan;Department of Electrical Engineering, COMSATS Institute of Information Technology, Abbottabad, Pakistan

  • Venue:
  • ISPRA'05 Proceedings of the 4th WSEAS International Conference on Signal Processing, Robotics and Automation
  • Year:
  • 2005

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Abstract

Recently the attention has to a large extent been paid to the problem of designing perfect reconstruction (PR) filter banks. However, filter banks are most often used in applications where small errors are inevitable and allowed. Imposing PR on a filter bank is then an unnecessarily severe restriction, which may lead to a higher arithmetic complexity than is actually required to meet the specification at hand. To reduce the complexity one should therefore use near-PR filter banks. In this paper, essential features of the recently introduced frequency-response masking (FRM) approach as a means of generating narrow transition band linear-phase FIR filters with a low arithmetic complexity are explained and demonstrated using simulation. By decomposing the overall transfer function into its polyphase form, all filtering in the interpolators and decimators can be performed at the lowest of the two sampling rates involved resulting in a low overall complexity. Simulated results show the difference between the FIR filter designed using FRM approach and traditional FIR filter of same order. The ripple contents of the pass-band of the filter designed using FRM approach are more as compare to the traditional one.