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Member of the filter design class.

Syntax

[b, a] = maxflat(m, n, w)

[b, a] = maxflat(m, 'sym', w)

[b, a, b1, b2] = maxflat(m, n, w)

[b, a, b1, b2] = maxflat(m, 'sym', w)

Description

Designs a maximally flat (generalized Butterworth) digital filter.

Examples

Inputs

Name	Description
m	Specifies the order of the numerator. m is a positive integer.
n	Specifies the order of the denominator. n is a positive integer.
w	Specifies the cutoff frequency. w is a real number between 0 and 1.
'sym'	Specifies a symmetric FIR Butterworth filter. If you specify 'sym', m must be an even number.

Outputs

Name	Description
b	Returns the numerator of the filter under design. b is the forward filter coefficient of order m. b is a real vector.
a	Returns the denominator of the filter under design. a is the backward filter coefficient of order n. a is a real vector.
b1	Contains all the zeros at -1. b = conv(b1, b2).
b2	Contains all the other zeros.

Examples

m = 8;
n = 6;
w = 0.6;
[b, a, b1, b2] = maxflat(m, n, w)

Related Topics

butter
buttord