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Member of the filter design class.

Syntax

b = firrcos(n, fc, bw)

b = firrcos(n, fc, bw, fs)

b = firrcos(n, fc, bw, fs, type)

b = firrcos(n, fc, bw, fs, type, d)

b = firrcos(n, fc, bw, fs, type, d, w)

b = firrcos(n, fc, r, fs, s)

b = firrcos(n, fc, r, fs, s, type)

b = firrcos(n, fc, r, fs, s, type, d)

b = firrcos(n, fc, r, fs, s, type, d, w)

[b, a] = firrcos(n, fc, bw)

[b, a] = firrcos(n, fc, bw, fs)

[b, a] = firrcos(n, fc, bw, fs, type)

[b, a] = firrcos(n, fc, bw, fs, type, d)

[b, a] = firrcos(n, fc, bw, fs, type, d, w)

[b, a] = firrcos(n, fc, r, fs, s)

[b, a] = firrcos(n, fc, r, fs, s, type)

[b, a] = firrcos(n, fc, r, fs, s, type, d)

[b, a] = firrcos(n, fc, r, fs, s, type, d, w)

Description

Designs a raised cosine FIR filter.

Examples

Inputs

Name	Description
n	Specifies the order of the filter. n is a positive integer.
fc	Specifies the cutoff frequency of the filter. fc must be greater than 0 and less than fs/2.
bw	Specifies the transition bandwidth. bw must be greater than 0. [fc-bw/2, fc+bw/2] must fall in the range [0, fs/2].
fs	Specifies the sampling frequency. fs must be greater than 0. The default is 2.
type	Specifies the type of filter to design. type is a string that accepts the following values: 'normal' Designs a normal raised cosine FIR filter. 'sqrt' Designs a square root raised cosine FIR filter.
d	Specifies the delay. d is a positive integer. The default is ceil(n/2).
w	Specifies the window to apply to the filter in order to reduce the ripple in the frequency response. w is a vector with length n + 1.
r	Specifies the transition bandwidth or the rolloff factor, depending on the value of s. The rolloff factor is equivalent to bw/(2*fc).
s	Specifies the meaning of r. s is a string that accepts the following values: 'bandwidth' (default) r specifies the transition bandwidth. 'rolloff' r specifies the rolloff factor.

Outputs

Name	Description
b	Returns the numerator of the filter under design. b is the forward filter coefficient of order n. 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 always [1].

Examples

firrcos(5, 0.5, 0.1, 2, 'sqrt')

Related Topics

fir1
fir2
firgauss
firls