Title: A simple method for the design of cosine-modulated pseudo-QMF banks
Authors: A. Kumar, G.K. Singh, R.S. Anand
Addresses: PDPM-Indian Institute of Information Technology Design and Manufacturing Jabalpur, Jabalpur 482005, MP, India. ' Indian Institute of Information Technology Roorkee, Uttrakhand 247667, India. ' Indian Institute of Information Technology Roorkee, Uttrakhand 247667, India
Abstract: In this paper, a simple and efficient iterative technique for designing of Cosine-Modulated (CM) filter banks with approximate reconstruction is presented. In the proposed technique, cut-off frequency is optimised to satisfy a new Perfect Reconstruction (PR) condition at frequency (ω = π/2M). Different window functions have been used to design the prototype filter for CM filter banks. The simulation results illustrate the improvement achieved through this method over other existing methods in terms of amplitude distortion (eam), Number of Iterations (NOI), aliasing distortion (ea) and computation time (CPU time). When it is exploited for subband coding of the Electrocardiogram (ECG) and speech signals, the proposed method yields good fidelity performance measuring parameters.
Keywords: cosine modulation; filter banks; pseudo-QMF bank; QMF bank; subband coding; electrocardiograms; ECGs; speech signals.
International Journal of Signal and Imaging Systems Engineering, 2010 Vol.3 No.4, pp.236 - 245
Published online: 10 Jan 2011 *Full-text access for editors Access for subscribers Purchase this article Comment on this article