0.1 0.25 0.3 0.5 A digital FIR notch filter satisfying the specifications given

Question

       0.1
       0.25
       0.3
       0.5

A digital FIR notch filter satisfying the specifications given below is to be designed using the optimal method. What is the normalized notch frequency of the filter?

                                notch frequency                              60 Hz
attenuation at notch frequency 50 dB
passband edge frequencies        55 Hz and 65 Hz
passband ripple                                0.1 dB
sampling frequency                        600 Hz
number of coefficients                  51 (Points : 6)

Explanation / Answer

The normalized frequency is given by 'f' and f = frequency / sampling frequency.

Here notch frequency is 60Hz and smpling frequency is 600Hz,

so normalized notch frequency, f = 60 / 600 = 0.1

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