Efficient Multirate Filtering

Contents	Abstract	Conclusion	Figures	FREE software
Introduction	Conversion	Narrow-Band	Half-Band	MATLAB Scipts

Narrow-Band and Wide-Band Filters:

Digital filters with sharp transition bands are difficult, sometimes impossible, to be implemented using conventional structures.
A serious problem with a sharp FIR filter is its complexity.
The FIR filter length is inversely proportional to transition-width and complexity becomes prohibitively high for sharp filters, (Lim, 1986).
IIR filters with sharp transition bands suffer from extremely high sensitivities of transfer function poles.
In many practical cases, the multirate approach is the only solution that could be applied for the implementation of a sharp FIR or IIR filter.

In this subchapter, we present two methods for designing sharp transition filteres: multistage filtering and frequency-response masking approach.

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Last updated September 9, 2008