7/26/2019 EC2314 DSP April 2011.pdf

1/3

Reg. No. :

B.E./ B.Tech. DEGREE EXAMINATION, APRIL/ MAY 2011

Fifth Semester

Electrical and Electronics Engineering

EC 2314 DIGITAL SIGNAL PROCESSING

(Regulation 2008)

Time : Three hours Maximum : 100 marks

Answer ALL questions

PART A (10 2 = 20 marks)

1. Define sampling theorem.

2. What is known as Aliasing?

3. What is meant by ROC?

4. Obtain the Discrete Fourier series coefficients of wnnx cos)( = .

5.

What is the relation between DFT and Z transform?

6. Draw the butterfly diagram for DITFFT.

7. What are the special features of FIR filters?

8.

What is meant by prewarping?

9. Mention the features of DSP processor.

10. What is the condition for linear phase in FIR filters?

PART B (5 16 = 80 marks)

Question Paper Code :11295

4

2

1

4

2

1

4

2

1

7/26/2019 EC2314 DSP April 2011.pdf

2/3

112952

11. (a) (i) Check whether the following is linear, time invariant, casual and

stable )1()()( ++= nnxnxny . (8)

(ii) Check whether the following are energy or power signals.

(1) )(2

1)( nunx

n

=

(2) njwAenx 0)( = . (8)

Or

(b) (i) Describe in detail the process of sampling and quantization.

Also determine the expression for quantization liner. (10)

(ii) Check whether the following are periodic

(1) )3cos()( nnx =

(2) )3sin()( nnx = . (6)

12. (a) (i) Determine the Ztransform of

(1)0

( ) cos ( )nx n a w n u n= . (5)

(2) )(3)( nunx n= . (3)

(ii) Obtain )(nx for the following :

21 52.052.11

1)(

+=zX

for ROC : | | 1, | | 0.5z z>