firhalfband (Digital Filter Design Toolkit, MathScript Function)

LabVIEW Digital Filter Design Toolkit 8.2 Help
September 2006

NI Part Number:
371988A-01

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Member of the multirate class.

Syntax

b = firhalfband(n, f)

b = firhalfband(n, f, 'high')

b = firhalfband('minorder', f, ripple)

b = firhalfband('minorder', f, ripple, 'kaiser')

b = firhalfband('minorder', f, ripple, 'kaiser', 'high')

Name	Description
n	Specifies the order of the filter. n is an even, positive number. If you do not specify n, you must specify a valid value for 'minorder'.
f	Specifies the passband edge frequency. f is a double-precision, floating-point number that must fall in the range (0, 0.5).
'high'	Specifies that b returns a highpass, halfband FIR filter. If you do not specify 'high', b returns a lowpass, halfband FIR filter.
'minorder'	Specifies that b returns a filter with the minimum order that meets the design requirements. If you do not specify 'minorder', you must specify a valid value for n.
ripple	Specifies the maximum ripple in the passband and stopband. ripple is a double-precision, floating-point number that must fall in the range (0, 1).
'kaiser'	Specifies whether to use the Kaiser Window method to design the filter. If you do not specify 'kaiser', this function uses the Remez method to design the filter.

Name	Description
b	Returns the coefficients of the designed FIR filter. b is a real vector with a length of n+1 or 'minorder'+1.

b = firhalfband(20, 0.4);
figure;
freqz(b);

b = firhalfband('minorder', 0.4, 0.001);
figure;
freqz(b);