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Question 1.1. (TCO 1) The magnitude frequency response of a filter is usually graphed in decibels versus frequency using which of the following equations? (Points : 5) 20 log (Vout) Vout 20 log (Vout/Vin) Vout/Vin Question 2.2. (TCO 2) Given a sampling frequency of f s and an input signal of f 1 which is greater than f s /2, how would the resulting aliased frequency, f a , be expressed? (Points : 5) f a = f s + f 1 f a = f 1 - f s f a = f 1 + f s f a = f s - f 1 Question 3.3. (TCO 2) The Nyquist sampling frequency requirement states _____. (Points : 5) the sampling frequency must be equal to the maximum input frequency the sampling frequency must be greater than or equal to the maximum input frequency the sampling frequency must be equal to twice the maximum input frequency the sampling frequency must be greater than or equal to twice the maximum input frequency Question 4.4. (TCO 3) Which equation correctly describes a sampled signal with values of 1 at n = 0, 1, 2, and 3 and 0 everywhere else? (Points : 5) x[n] = u[n] – u[n-3] x[n] = u[n] – u[n-4] x[n] = u[n-4] - u[n] x[n] = u[n] + u[n-1] + u[n-2] + u[n-3] Question 5.5. (TCO 3) For a moving average filter with b k coefficients equal to 0.2 and given that the input to the filter starts at sample x[n], how many input samples are required to define all input terms for all filter coefficients? (Points : 5) 0 1 5 10 Question 6.6. (TCO 4) For a 7-term moving average filter, the lowest digital frequency where the gain is zero occurs at what frequency Ω? (Points : 5) 0.449 radians 0.143 radians 0.898 radians Zero gain never occurs.
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