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what the casino sent them, to obtain either x1 [n] or x2 [n] — you will know which from your earlier answers.
24. [4 points]: How can you recover x[n] from either x1 [n] alone or x2 [n] alone, using the fact that
x[n] is 0 for n < 0? The general lesson here is that a onesided signal (i.e., a signal that is identically zero for all n less than
some n0 , or for all n greater than some n0 ) is uniquely determined by just the real part (or equivalently, by
just the imaginary part) of its DTFT. Page 16 of 17 6.02 Fall 2012, Quiz 2 VI Bring Me the Messenger [Although this problem is phrased in continuoustime, it should be quite straightforward for you to do on
the basis of the fundamentals you’ve learned in the setting of DT modulation/demodulation. If it helps you,
you could think instead in terms of DT samples of the signals here, taken at some sampling rate fs kHz,
and then map each frequency f given here in kHz to a frequency of Ω = 2πf /fs radians/sample. However,
that’s much more com...
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This document was uploaded on 03/17/2014 for the course ELECTRICAL 6.02 at MIT.
 Fall '12
 GeorgeVerghese

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