A real value signal x[n] is said to be antisymmetric if a. x(n) =x(−n) b. x(n) = x(−n) c. x(n) =−x(n) d. nothing is right
1. A real value signal x[n] is said to be antisymmetric if
a. x(n) =x(−n)
b. x(n) = x(−n)
c. x(n) =−x(n)
d. nothing is right
2. If x(n)={....0,0,2,−1,3,7,?,2,−3,0,0........... .............} and y(n)= {....0,0,1,−1,2,−2,?,1,−2,5,0, 0 ............................} then the cross correlation x(n) and y(n) is?
a. {10,9,19,36,−14,33,0,?,13,−18,16,7,5,−3}
b. {10, −9,19,36, −14,33,0, ?, 13, −18,16, −7,5, −3}
c. {10,9,19,36,14,33,0, −?, 13, −18,16, −7,5, −3}
d. {10,−9,19,36,−14,33,0,−?,13,18,16,7,5,−3}
3. What is the relationship between the analog signal frequency F and the digital signal frequency f? (T is the period of the sampling period)
a. F =f∗T
b. F = F*T
c. No connection
d. Nothing is right
4. If the signal x(t)=cos(2∗pi∗40∗t) is sampled with a sampling frequency of 20 Hz, what signal will be produced?
a. cos(pi * n)
b. cos(2*pi*n)
c. cos(4*pi*n)
d. cos(8*pi*n)
5. What is the minimum sampling frequency that must be used to sample the signal x(t) = 3cos(50 * pi * t) + 10sin(300 * pi * t) cos(100 * pi * t) to avoid aliasing?
a. 50 Hz
b. 100 Hz
c. 200 Hz
d. 300 Hz
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