fdesign.octave - Extend to frequencies below 20 Hz
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I'd like to design a third-ocatve filter with the function fdesign.octave for center frequency below 20 Hz (10 Hz), But I got the following warning. Any possibility to extend the valid frequency range?
d1 = fdesign.octave(3,'Class 1','N,F0',6,10,4096);
Warning: Valid values for the 'F0' property are :
25.12
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Risposte (1)
Samatha Aleti
il 23 Mar 2020
Center frequencies must be greater than 20 Hz and less than 20,000 Hz. If the center frequency specified is not valid, it will be rounded to nearest valid value. In your case the nearest valid value is 25.12.
You can know the valid center frequency values of a specific filter using “validfrequencies” as follows:
d1 = fdesign.octave(3,'Class 1','N,F0',6,10,4096);
validcenterfreq = validfrequencies(d1);
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