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:A
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
Explanation: The difference equation for the high pass filter is