Minimum bandwidth is nothing but it is equals to the Nyquist bandwidth.
Minimum Bandwidth can be written as:
(BW) min = Rate/2
= 33.6/2
B = 16.8KHz
Case 1 : r = 0.5
Bandwidth = B(1+ α ) ; where α is roll-off factor
= 16.8(1+0.5)
= 25.2 KHz
Case 2: r = 1 i.e,100%
Bandwidth = B(1+ α ) ; where α is roll-off factor
= 16.8(1+1)
= 33.6 KHz
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