Matlab
Fig : Matlab code to design a butterworth band stop filter of
- amount of ripple allowed in the pass band in decibels = 1 dB
- frequency at the start of the pass band = 2π/8 rad/sec
- frequency at the end of the pass band = 6 π/8 rad/sec
- frequency at the end of the first stop band =3π/8 rad/sec
- frequency at the start of the second stop band=5π/8 rad/sec
- attenuation in the first stopband in decibels = 60 dB
More design specifications can be found in mathwork :
http://www.mathworks.com/help/dsp/ref/fdesign.bandstop.html
figure visualisation in matlab
Lab-view
The design of a 4th order butterworth, bandstop filter at a lower cutoff frequency of 45 Hz and upper cutoff frequency of 55 Hz is realized as shown. The filter options can be found in the signal processing toolkit in labview.
