[SOLVED] Need help for Frequency response plot

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moonnightingale

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I have a multiple choice question
I have used fvtool command but i m not getting similar answer from given option
plz help me anf tell me correct option
 

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I will give you only a tip: x[n] - x[n-1]
That means subtracting the previous input from the current one.
i.e., if you have a DC signal, the output will be null...

If this doesn't help you enough, try finding the zero of the system (z transform).
 

Z-transforming the system:

y = -0.9*z^-1 + x + x*z^-1

the response will be:

H(z) = y/x = (1-z^-1)/(1+0.9*z^-1)

the frequency spectrum can be calculated setting z = exp(j*w*t):

H(j*w) = (1-exp(-j*w*t)/(1+0.9*exp(-j*w*t))

H(0) = 0

In abscissa of yout graph there is the angular frequency w

The correct answer should be D.
 
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