Signal Processing - Study Mode
[#371] A continuous time function x(t) is periodic with period T. The function is sampled uniformly with a sampling period T s . In which one of the following cases is the sampled signal periodic?
Correct Answer
(B) T = 1.2T s
[#372] The phase response of a passband waveform at the receiver is given by $$varphi left( f
ight) = - 2pi alpha left( {f - {f_c}}
ight) - 2alpha x08eta {f_c},$$ where f c is the centre frequency, and α and β are positive constants. The actual signal propagation delay from the transmittance to receiver is
Correct Answer
(C) α
[#373] For a given sample-and-hold circuit, if the value of the hold capacitor is increased, then
Correct Answer
(B) Drop rate decreases and acquisition time increases
[#374] A continuous time LTI system is described by $${{{d^2}yleft( t
ight)} over {d{t^2}}} + 4{{dyleft( t
ight)} over {dt}} + 3yleft( t
ight) = 2{{dxleft( t
ight)} over {dt}} + 4xleft( t
ight)$$ Assuming zero initial conditions, the response y(t) of the above system for the input x(t) = e -2t u(t) is given by
Correct Answer
(B) (e -t - e -3t )u(t)
[#375] The 3-dB bandwidth of the low-pass signal e -t u(t), where u(t) is the unit step function, is given by
Correct Answer
(A) $${1 over {2pi }}Hz$$