EC3492 Digital Signal Processing
Important Questions
Unit 1
- Draw radix 4 butterfly structure for (DIT) FFT algorithm.
- 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.
- Determine and sketch the magnitude and phase response of y(n) + 1/2 * [x(n) + x(n – 2)]
- Determine X(k) for N = 8 using DIT-FFT algorithm for the given function below: x(n) = 2 ^ n
Unit 2
- Distinguish between FIR and IIR filters.
- Discuss the properties of Butterworth filter and Chebyshev filter.
- 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
- Discuss in detail about FIR filter design using windows.
- Explain Finite word length effects in FIR filters.
- Design a high pass filter using hamming window with a cut-off frequency of 1.2 radians/sec and N = 9
Unit 4
- Give the effective of quantization noise in signal processing and also mention input/output quantization.
- Write in detail about Finite word length effects.
- 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) - 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
- Discuss the sampling rate conversion by rational factor.
- Explain in detail about DSP architecture.
- Discuss the poly-phase structure of interpolator and decimator.
- Describe the features of adaptive filters and any two applications of adaptive filters.