If the low pass filter described by the difference equation y(n)=0.9y – McqOptions

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1.	If the low pass filter described by the difference equation y(n)=0.9y(n-1)+0.1x(n) is converted into a high pass filter, then what is the frequency response of the high pass filter?
A.	0.1/(1+0.9ejω)
B.	0.1/(1+0.9e-jω)
C.	0.1/(1-0.9ejω)
D.	None of the mentioned
Answer» C. 0.1/(1-0.9ejω)

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