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ELL727 weekly quiz-3

Authored by Vivek Venkataraman

Engineering

University

Used 9+ times

ELL727 weekly quiz-3
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5 questions

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1.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Consider a DAC having a reconstruction pulse of the form p(t) = e-2tu(t). The equalizer filter E(f) needed to reconstruct the original analog signal from its sampled values must have a dc response E(f = 0) =

2.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Consider a sinusoidal signal at 6-MHz sent through a system consisting of an ideal ADC taking samples every 100-ns followed by an ideal DAC for this sampling rate. The output signal is a sinusoid with a frequency (in MHz) of

3.

FILL IN THE BLANK QUESTION

1 min • 1 pt

If the Nyquist sampling rate for a band-limited signal x(t) is F, then the Nyquist rate for the signal x(t)cos(2πFt) is

4.

FILL IN THE BLANK QUESTION

1 min • 1 pt

A signal x(t) is band-limited to 3 kHz. It is first sampled at a rate fs kHz, and then reconstructed using a LPF having zero amplitude response only beyond 5 kHz. The minimum value of fs for perfect distortion-free reconstruction of x(t) is

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The Nyquist sampling rate for the signal x(t) = sinc(f1t).sinc(f2t), where sinc(x) = sin(πx)/(πx), is

max(f1,f2)

min(f1,f2)

f1 + f2

|f1 - f2|

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