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EC3492 Digital Signal Processing Important Questions

EC3492 Digital Signal Processing

Important Questions

Unit 1

  1. Draw radix 4 butterfly structure for (DIT) FFT algorithm.
  2. Two finite duration sequence are given by x(n) = sin(ηπ/2) for n = 0,1,2,3 h(n)=2n for n=0,1,2,3. Determine circular convolution using DFT & IDFT method.
  3.  Determine and sketch the magnitude and phase response of y(n) + 1/2 * [x(n) + x(n – 2)]
  4.  Determine X(k) for N = 8 using DIT-FFT algorithm for the given function below: x(n) = 2 ^ n

Unit 2

  1.  Distinguish between FIR and IIR filters.
  2.  Discuss the properties of Butterworth filter and Chebyshev filter.

  3. Using the bilinear transform design a high-Pass filter, monotonic in pass-band with cut-off frequency of 1000 Hz and down 10 dB at 350 Hz. The sampling frequency is 5000 Hz.

Unit 3

  1. Discuss in detail about FIR filter design using windows.
  2. Explain Finite word length effects in FIR filters.

  3. Design a high pass filter using hamming window with a cut-off frequency of 1.2 radians/sec and N = 9

Unit 4

  1. Give the effective of quantization noise in signal processing and also mention input/output quantization.
  2. Write in detail about Finite word length effects.
  3. Find the steady state variance of the noise in the output due to quantization of input for the first order filter.
    y(n) = ay(n – 1) + x(n)
  4. Consider the following second order IIR filter H(z) find the effect on quantization on pole locations of the given system function in direct form and in cascade form. Take b = 3 bits. 

Unit 5

  1. Discuss the sampling rate conversion by rational factor.
  2. Explain in detail about DSP architecture.
  3. Discuss the poly-phase structure of interpolator and decimator.
  4. Describe the features of adaptive filters and any two applications of adaptive filters.

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