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    Digital signal processing problem

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    The problem(2-61) is from the third edition of
    digital signal processing(proakis+manolakis)

    2-61 an audio signal s(t)generated by a loud speaker is reflected at two different walls with reflection coefficients r1 and r2. the signal x(t) recorded by amicrophone close to the loud speaker, after sampling is;

    where k1 and k2 are the delays of the two echoes.

    a) determine the autocorrelation rxx(l) of the signal


    b) what happens if r2=0?

    c) can we obtain r1,r2,k1, and k2 by observing rxx(l)?

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