Design of Butterworth Filter

The aim of the experiment is to design Analog and Digital Butterworth Filter.

The objective is to design a digital filter from Analog filter and study the aliasing effect due to sampling in Impulse Invariant Method and the frequency warping effect in BLT Method.

 Input Specifications :

(1) Pass band Attenuation (Ap< 3 dB)  (2) Stop band Attenuation (As> 40 dB )

(3) Pass band Frequency (Fp) in Hz  (4) Stop band Frequency (Fs) in Hz

(5) Sampling Frequency (F) in Hz

In this experiment we have studied that,

1.  response in butterworth filter is monotonic. 

2. As the order increases the response becomes more sharpen in both high pass filter and low pas filter.

3. In this designing we initially find order through pass band and stop band frequency.and find normalized and denormalised transfer function and the find actual transfer function in z transform.

https://drive.google.com/drive/folders/0ByMxeH1FMa8uYW5Ecnl4QWJiZkk