**EE6403 Question Bank Discrete Time Systems and Signal Processing**

EE6403 Question Bank Discrete Time Systems and Signal Processing Regulation 2013 Anna University free download.

**Sample EE6403 Question Bank:**

**1.What is DFT?**

It is a finite duration discrete frequency sequence, which is obtained by sampling one period of Fourier transform. Sampling is done at N equally spaced points over the period extending from w=0 to 2л.

**2. Define N point DFT.**

The DFT of discrete sequence x(n) is denoted by X(K). It is given by, Here

k=0,1,2…N-1 Since this summation is taken for N points, it is called as N-point DFT.

**3. What is DFT of unit impulse δ(n)?**

The DFT of unit impulse δ(n) is unity.

**4. List the properties of DFT.**

Linearity, Periodicity, Circular symmetry, symmetry, Time shift, Frequency shift, complex conjugate, convolution, correlation and Parseval‘s theorem.

**5. State Linearity property of DFT.**

DFT of linear combination of two or more signals is equal to the sum of linear combination of DFT of individual signal.

**6. When a sequence is called circularly even?**

The N point discrete time sequence is circularly even if it is symmetric about the point zero on the circle.

**7. What is the condition of a sequence to be circularly odd?**

An N point sequence is called circularly odd it if is antisymmetric about point zero

on the circle.

**8. Why the result of circular and linear convolution is not same?**

Circular convolution contains same number of samples as that of x (n) and h (n), while in linear convolution, number of samples in the result (N) are, N=L+M-1 Where L= Number of samples in x (n) M=Number of samples in h (n)

**9. What is circular time shift of sequence?**

Shifting the sequence in time domain by ‗1‘ samples is equivalent to multiplying the sequence in frequency domain by WNkl

Subject Name | Discrete Time Systems and Signal Processing |

Subject Code | EE6403 |

Regulation | 2013 |

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