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prony

Prony's method for designing IIR filter response.

Calling Sequence

[B,A] = prony(H, NB, NA)

Parameters

H

Impulse response of filter.

NB

Order of the numerator polynomial.

NA

Order of the denominator polynomial.

B

Numerator polynomial of order NB+1 of the designed filter.

A

Denominator polynomial of order NA+1 of the designed filter.

Description

Computes the numerator and the denominator polynomials B and A in z-1 of order NB+1 and NA +1 for a given impulse response H. This function is a clone of MATLAB's prony function and hence gives similar results.

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Examples

// any arbitrary impulse response h
h=[1 2 3 4 5 4 3 2 1]; 

// b numerator polynomial in z-1 of order 4 and  a denominator polynomial in z-1 of order 6 representing h is given by
[b,a]=prony(h,3,5)

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