Term Test

Question 1

DFT is applied to

a) Infinite sequences
b) Finite discrete sequences
c) Continuous infinite signals
d) Continuous finite sequences

Answer 1

Finite discrete sequences

Question 2

The circular convolution of two sequences in the time domain is equivalent to

a) Multiplication of DFTs of two sequences
b) Summation of DFTs of two sequences
c) Difference of DFTs of two sequences
d) Square of multiplication of DFTs of two sequences

Answer 2

Multiplication of DFTs of two sequences

Question 3

What is value of twiddle factor______________

a) ej2πN
b) e-j2πN
c) e-j2π/N
d) ej2π/N

Answer 3

e^-j2π/N

Question 4

Which of the following is true regarding the number of computations required to compute an N-point DFT?

a) N2complex multiplications and N(N-1) complex additions
b) N2complex additions and N(N-1) complex multiplications
c) N2complex multiplications and N(N+1) complex additions
d) N2complex additions and N(N+1) complex multiplications

Answer 4

N2 complex multiplications and N(N-1) complex additions

Question 5

If W4100=Wx200, then what is the value of x?

a) 2
b) 4
c) 8
d) 16

Answer 5

8

Question 6

For a decimation-in-time FFT algorithm, which of the following is true?

a) Both input and output are in order
b) Both input and output are shuffled
c) Input is shuffled and output is in order
d) Input is in order and output is shuffled

Answer 6

Input is shuffled and output is in order

Question 7

For a decimation-in-frequency FFT algorithm, which of the following is true?

a) Both input and output are in order
b) Both input and output are shuffled
c) Input is shuffled and output is in order
d) Input is in order and output is shuffled

Answer 7

Input is in order and output is shuffled

Question 8

FFT algorithm is designed to perform complex operations.

a) True
b) False

Answer 8

True

Question 9

If X1(k) and X2(k) are the N-point DFTs of X1(n) and x2(n) respectively, then what is the N-point DFT of x(n)=ax1(n)+bx2(n)?

a) X1(ak)+X2(bk)
b) aX1(k)+bX2(k)
c) eakX1(k)+ebkX2(k)
d) aX1(k)-bX2(k)

Answer 9

aX1(k)+bX2(k)

Question 10

In Overlap add method, what is the length of the input data block?

a) L-1
b) L
c) L+1
d) 1/L

Answer 10

L

Question 11

DIT algorithm divides the sequence into

a. Positive and negative values
b. Even and odd samples
c. Upper higher and lower spectrum
d. Small and large samples

Answer 11

Even and odd samples

Question 12

What is the DFT of the four-point sequence x(n)= {0,1,2,3}?

a) {6, -2+2j-2, -2-2j}
b) {6, -2-2j,2, -2+2j}
c) {6, -2+2j, -2, -2-2j}
d) {6, -2-2j, -2, -2+2j}

Answer 12

{6, -2+2j, -2, -2-2j}

Question 13

The twiddle factor satisfies

a) wkN= wkN/2
b) wk+N/2 N= wkN
c) wk+N N= -wkN
d) wk+N/2 N= -wk N

Answer 13

wk+N/2 N= -wk N

Question 14

Find the IDFT of the given sequence X (k) = {2, 2-3j, 2+3j, -2}

a) [1, -0.75-j, 1+1.5j, 0.75+1.75j]
b) [1, 0.75+j, 1-1.5j, -0.75-1.75j]
c) [1, 0.75+j, 1+1.5j, -0.75-1.75j]
d) [1, -0.75+j, 1+1.5j, -0.75-1.75j]

Answer 14

Dk

Question 15

15) Which of the following is true in case of Overlap add method?
a) M zeros are appended at last of each data block
b) M zeros are appended at first of each data block
c) M-1 zeros are appended at last of each data block
d) M-1 zeros are appended at first of each data block

Answer 15

M-1 zeros are appended at last of each data block

Question 16

The IIR filter designing involves

a) Designing of an analog filter in analog domain and transforming into digital domain
b) Designing of digital filter in analog domain and transforming into digital domain
c) Designing of analog filter in digital domain and transforming into analog domain
d) Designing of digital filter in digital domain and transforming into analog domain

Answer 16

Designing of digital filter in analog domain and transforming into digital domain

Question 17

For a system function H(s) to be stable

a) zeros lie in left half of the s plane
b) The zeros lie in right half of the s plane
c) The poles lie in left half of the s plane
d) The poles lie in right half of the s plane

Answer 17

The poles lie in left half of the s plane

Question 18

What is the duration of the unit sample response of a digital filter?

a) Finite
b) Infinite
c) Impulse (very small)
d) Zero

Answer 18

Infinite

Question 19

The transformation technique in which there is one to one mapping from s domain to z-domain is

a) Approximation of derivatives
b) Impulse invariance method
c) Bilinear transformation method
d) Backward difference for the derivative

Answer 19

Bilinear transformation method

Question 20

When σ=0, then what is the condition on ‘r’?

a) r=0
b) r=1
c) 0

Answer 20

r=1

Question 21

Which of the following is the correct relation between ω and Ω?

a) Ω=ωT
b) T=Ωω
c) ω=ΩT
d) ω=Ω

Answer 21

ω=ΩT

Question 22

When σ>0, then what is the condition on ‘r’?

a) r=0
b) r>1
c) 0

Answer 22

r>1

Question 23

When σ<0, then what is the condition on ‘r’?

a) r=0
b) r<1
c) r>0
d) None of the mentioned

Answer 23

r<1

Question 24

If the conversion technique is to be effective, then the LHP of s-plane should be mapped into _____________

a) Outside of unit circle
b) Unit circle
c) Inside unit circle
d) Does not matter

Answer 24

Inside unit circle

Question 25

Which of the following rules is used in the bilinear transformation? a) Simpson’s rule b) Backward difference c) Forward difference d) Trapezoidal rule

Answer 25

Trapezoidal rule

Question 26

11) Which of the following substitutions is done in Bilinear transformations? a) s = 2/T[z-1/z+1] b) s = 2T[1+z/1-z] c) s = 2/T[z+1/z-1] d) s = T/2[z+1/z-1]

Answer 26

s = 2/T[z-1/z+1]

Question 27

In IIR Filter design by the Bilinear Transformation, the Bilinear Transformation is a mapping from a) Z-plane to S-plane b) S-plane to Z-plane c) S-plane to J-plane d) J-plane to Z-plane

Answer 27

S-plane to Z-plane

Question 28

``` Which of the following defines a Chebyshev polynomial of order N, TN(x)? a) cos (Ncos-1x) for all x b) cosh (Ncosh-1x) for all x c) cos (Ncos-1x), |x|<1 cosh (Ncosh-1x), |x|>1 d) cosh (Ncos-1x) for all x ```

Answer 28

cos (Ncos-1x), |x|<1 | cosh (Ncosh-1x), |x|>1

Question 29

The Low pass Chebyshev type-1 filters have a) Flat pass band b) Equiripple stop band c) Equiripple pass band d) Tapering stop band

Answer 29

Equiripple pass band Not sure

Question 30

The impulse invariant method is obtained by a) Sampling the impulse response of an equivalent analog filter b) Taking backward difference for the derivative c) Mapping from s-domain to z-domain d) Approximation of derivatives

Answer 30

Sampling the impulse response of an equivalent analog filter

Question 31

The computational procedure for Decimation in frequency algorithm takes a) Log2 N stages b) Log2 N/2 stages c) 2 Log2 N stages d) Log2 N2 stages

Answer 31

Log2 N stages

Question 32

What is the sequence y(n) that results from the use of four point DFTs if the impulse response is h(n)={1,2,3} and the input sequence x(n)={1,2,2,1}? a) {9,7,9,14} b) {14,16,14,16} c) {9,7,9,11} d) {14,14,16,16}

Answer 32

{9,7,9,11}

Question 33

In Overlap save method of long sequence filtering, what is the length of the input sequence block? a) L b) L-1 c) L+M-1 d) L+M

Answer 33

L+M-1

Question 34

In Overlap save method of long sequence filtering, how many zeros are appended to the impulse response of the FIR filter? a) L-1 b) L c) L+1 d) L+M-1

Answer 34

L-1

Question 35

If we split the N point data sequence into two N/2 point data sequences f1(n) and f2(n) corresponding to the even numbered and odd numbered samples of x(n), then such an FFT algorithm is known as decimation-in-time algorithm.

Answer 35

True

Question 36

If we split the N point data sequence into two N/2 point data sequences f1(n) and f2(n) corresponding to the even numbered and odd numbered samples of x(n) and F1(k) and F2(k) are the N/2 point DFTs of f1(k) and f2(k) respectively, then what is the N/2 point DFT X(k) of x(n)?

Answer 36

F1(k)-WNk F2(k)

Question 37

What is the circular convolution of the sequences X1(n)={2,1,2,1} and x2(n)={1,2,3,4}? a) {14,16,14,16} b) {9,7,9,7} c) {14,14,16,16}

Answer 37

{14,16,14,16}

Question 38

f X(k) is the N-point DFT of a sequence x(n), then what is the DFT of x*(n)?

Answer 38

X*(N-k)

Question 39

The similarity between the Fourier transform and the z transform is that a) Both convert discrete time domain to frequency spectrum domain b) Both convert discrete frequency domain to time spectrum domain c)

Answer 39

Both convert discrete time domain to frequency spectrum domain

Question 40

The Nth rot of unity WN is given as ______________

Answer 40

e-j2π/N

Question 41

In Signal Processing ,the conditioner block is required ____ (a) to filter, to demodulate , to amplify the Signal. (b) to demodulate (c) to amplify the Signal (d) to filter, to demodulate

Answer 41

(a) to filter, to demodulate , to amplify the Signal.

Question 42

Special Instructions provided by DSP chip are: | a) Reduced overhead instructions (b) Basic instructions (c) Application based instructions (d) (a),(b),(c

Answer 42

(a),(b),(c)

Question 43

Which pair of instruction support simultaneous loading of data into temp. register and data shifting (a) RTP, NM1 (b) LTM,PPT (c) LTD.MPY (d) MACD, HNM1

Answer 43

LTD.MPY

Question 44

The block B0 of DARAM on chip size is (a) 32× 16 bit data (b) 512× 16 bit program (c) 512× 16 bit data (d) 512× 16 bit data /program

Answer 44

512× 16 bit data /program

Question 45

CBSR1 stands for (a) Circular buffer 2 start register (b) Circular buffer 1start register (c) Circular buffer 1end register (d) Circular buffer 2 end register

Answer 45

Circular buffer 1start register

Question 46

In status register 1 of TMS320C5x OVM bit rest value is (a) 0 (b) 1 (c) X (d) Nc.

Answer 46

X

Question 47

ARAU is a part of which area of architecture of TMS320C5x (a) Memory (b) Peripherals (c) CPU (d) Busses

Answer 47

CPU

Question 48

Types of architecture of DSP | a) Von Neumann (b) Harward (c) Super Harward (d) (a),(b),(c

Answer 48

(a),(b),(c)

Question 49

Important aspects of optimizing SHARC are (a) I/O Controller , instruction Cache (b) On chip peripherals , I/O chip (c) Specialized Addressing Modes , I/O Controller (d) Specialized program code , On chip peripherals

Answer 49

I/O Controller , instruction Cache

Question 50

The technique that allows 1 or more operations to overlap during execution is known as (a) Instruction Cache (b) On chip peripherals (c) Pipelining (d) Specialized program

Answer 50

Pipelining

Question 51

Typical DSP MAC computes _______ product (a) 8bit (b) 32bit (c) 16bit (d) 28bit

Answer 51

32bit

Question 52

TMS320C5x family of processor consist of ____ types of on-chip memory (a) 2 (b) 3 (c) 1 (d) 8

Answer 52

3

Question 53

The architecture of TMS320C5x is broadly classified in ____ major areas. (a) 4 (b) 2 (c) 3 (d) 5

Answer 53

3

Question 54

Name the techniques to achieve extended parallelism (a) SIMD, SSP, SMP (b) SIMD, VLIW, SSP (c) VLIM,SMP (d) VLIM , SSP

Answer 54

SIMD, VLIW, SSP

Question 55

How many methods are there to slow down the processor by adding wait states (a) 2 (b) 3 (c) 1 (d) 4

Answer 55

2