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.TH group 1 "April 1993" "Scilab Group" "Scilab Function"
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group - group delay for digital filter
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[tg,fr]=group(npts,a1i,a2i,b1i,b2i)
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: integer : number of points desired in calculation of group delay
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: in coefficient, polynomial, rational polynomial, or
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cascade polynomial form this variable is the transfer
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function of the filter. In coefficient polynomial
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form this is a vector of coefficients (see below).
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: in coeff poly form this is a vector of coeffs
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: in coeff poly form this is a vector of coeffs
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: in coeff poly form this is a vector of coeffs
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: values of group delay evaluated on the grid fr
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: grid of frequency values where group delay is evaluated
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Calculate the group delay of a digital filter
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with transfer function h(z).
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The filter specification can be in coefficient form,
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polynomial form, rational polynomial form, cascade
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polynomial form, or in coefficient polynomial form.
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In the coefficient polynomial form the transfer function is
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formulated by the following expression
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\fVh(z)=prod(a1i+a2i*z+z**2)/prod(b1i+b2i*z+z^2)\fR