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Quiz: DSP - Discrete Fourier transform

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Number of Questions: 26

Question: 16 -

What is the DFT of the four point sequence x(n)={0,1,2,3}?

Options:

  1. {6,-2+2j,-2,-2-2j}

  2. {6,-2-2j,-2,-2+2j}

  3. {6,-2+2j-2,-2-2j}

  4. {6,-2-2j,2,-2+2j}

    5. Answer:

    {6,-2+2j,-2,-2-2j}
    Solution not available.

Question: 17 -

A signal x[n] is anti symmetric or odd when

Options:

  1. x[n] = [x[n]]2

  2. x[-n] = x[n] • x[n]

  3. x[n] = -x[n]

  4. x[-n] = -x[n]

    5. Answer:

    x[-n] = -x[n]
    Solution not available.

Question: 18 -

If W4100=Wx200, then what is the value of x?

Options:

  1. 8

  2. 16

  3. 4

  4. 2

    5. Answer:

    8
    Solution:

    According to the periodicity and symmetry property,
    100/4=200/x=>x=8.

Question: 19 -

Decimation is a process in which the sampling rate is __________.

Options:

  1. enhanced

  2. unpredictable

  3. stable

  4. reduced

    5. Answer:

    reduced
    Solution not available.

Question: 20 -

Time reversal of a discrete time signal refers to

Options:

  1. y[n] = x[n-k]

  2. y[n] = x[-n-k]

  3. y[n] = x[-n+k]

  4. y[n] = x[-n]

    5. Answer:

    y[n] = x[-n]
    Solution not available.