# Digital Signal Processing Elective I Question Papers

# Andhra University

**Digital Signal Processing (Elective-I)**

**B. Tech (CSE) Degree Examination**

**Forth Year – First Semester**

Effective from the admitted batch of 2004-2005

Time: 3 hrs

Max Marks: 70

First Question is Compulsory

Answer any four from the remaining questions

All Questions carry equal marks

Answer all parts of any question at one place

1. a) Are the following systems CAUSAL?

y(n) = x(n) + 0.25 x(n-1) + 0.5 x(n-2)

y(n) = x(n+1) – 0.5 x(n-1) + 0.8 x(n-1)

b) What is the number of multiplications required for performing the convolution of two sequences with identical length 8 using the direct method?

c) What are the special addressing modes in Programmable DSPs?

d) What are the various units present in TMS32OCX CPU?

e) What is the use of guard bits in accumulators?

f) Which of the following instructions has an operand of length 3-bits in

TMS32OC54X DSP? LLD #05,ARP AND #1234h,A,A

g) What are pipeline latencies in C54X DSP?

2 .a) Determine the impulse response coefficients of a digital LP filter with H (e^{jw})=1, for

ω < ω_{c} and, H (e^{jw})=0 for ω < ω_{c} < π

b) Show how the computational complexity of an FIR filter of order 21 can be reduced by using three polyphase filters.

3 .a) Disitinguish among Von Neumann, Harward and Modified Harward architecture for the computer. Which architecture is preferred for DSp applications and why?

b) Explain the operation of TDM serial ports in Programmable DSPs.

4. Explain the internal architecture of TMS32OC3X using its functional block diagram.

5. a) Describe different addressing modes with examples for TMS32OCX DSP

b) Write TMS32OC3X assembly language program for generation of Fabonocci series.

6. a) What is the use of the following registers of TMS32OC54X DSP: T, TRN, BIC, XPC

b) Explain the operation of CSSU of TMS32OC54X and explain its use with an application

7.a) Explain the operation of parallel instructions of TMS32OC54X

b) Write a TMS32054X assembly language program to find the sum of the series 1+2+3+……..1000

8. Write short notes on the following

a) FIR Filters b)Multiported Memory

c) ALU of TMS32OC54X d) Code Composer Studio