Digital Signal Processing with Matlab Examples, Volume 1 by Jose Maria Giron-Sierra

Author:Jose Maria Giron-Sierra
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

The Program B.6 has been included in Appendix B.

Another classical way for the design of digital IIR filters is to use discretization methods, based on bilinear transformation or based on impulse invariance. This was already studied in Sect. 5.2.

5.4.2 Direct Design

There is a number of direct methods to obtain digital IIR filters, departing from a known desired frequency response, or from a known desired impulse response. Notice that using the discrete inverse Fourier transform, ifft() , one can obtain the impulse response from the frequency response.

The target of the IIR design is to obtain the discrete transfer function of the IIR filter. The degree of the denominator is na, and the degree of the numerator is nb. There are two types of IIR filters: the all-pole IIR filters, with , and the recursive IIR filters, with .

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