Flashcards

EXAM 2 BUCKWARTS

Angelo Deluca English 20 cards

Cards in this deck (20)

1If x[n] is real and even, then ak will be real.True
2—True
3If you convolve x[n] with y[n], then you also convolve their Fourier series ak and bk.False. You multiply, not convolve.
4The Fourier series for the sum of the two signals x[n]+y[n] is the sum ak+bk.True
5—True
6Discrete-time LTI systems designed to remove some frequencies from a signal while leaving other frequencies unchanged are known as frequency modulation systems.False. These are called frequency selective filters.
7The region from -π/4 < ω < π/4 in the frequency response below is the passband of the filterFalse. This is the stop band of the filter.
8The frequency response shown below is an example of a discrete-time lowpass filter.False. This is an example of a discrete-time bandpass art.
9—True
10Shifting a signal in time is equivalent to multiplying its Fourier transform by a complex exponential.True
11—True
12If x[n] is real, then its Fourier transform X(ejw) is conjugate odd symmetric X(ejw)= -X*(e-jw)False. It is conjugate even symmetric
+X*(e-jw)
13—2cos((π/2)n)
14The impulse response of an ideal discrete-time lowpass filter with cutoff frequency ωo isFalse. The response of an ideal discrete-time lowpass filter is
15—True
16Which of the steps below is not part of the process of designing the impulse response of a causal FIR filter A. Design the ideal filter impulse for the desired filter B. Flip the impulse response C. Shift the impulse response to make it causal D. Truncate the impulse response to the desired lengthB. Flip the impulse response
17Which of the following is equal to e^jx? A. (1/2)cos(x) B. cos(x)+jsin(x) C. sin(x)+jcos(x) D. cos(x)-jsin(x)B. cos(x)+jsin(x)
18The causal first order system y[n]-ay[n-1]=x[n] has impulse response h[n]=aδ[n-1]False. It has impulse response
19—False
20Depending on the coefficients of the difference equation, the impulse response of a second order system could be the sum of two decaying exponentials(overdamped), or an oscillating sinusoid with an exponentially decaying envelope (underdamped).True