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EC8553-DTSP-MODEL I-PART A

Total questions: 30

Worksheet time: 30mins

Name
Class
Date
1.
A filter is said to be linear phase filter if the phase delay and group delay are _______
a)
High
b)
Moderate
c)
Low
d)
Constant
2.

In the frequency sampling method for FIR filter design, we specify the desired frequency response Hd(ω) at a set of equally spaced frequencies.

a)

True

b)

False

3.

What is the frequency response of a system with input h(n) and window length of M?

a)

∑n=0M−1h(n)ejωn\sum_{n=0}^{M-1}h(n)e^{jωn}

b)

∑n=0Mh(n)ejωn\sum_{n=0}^Mh(n)e^{jωn}

c)

∑n=0Mh(n)e−jωn\sum_{n=0}^Mh(n)e^{-jωn}

d)

∑n=0M−1h(n)e−jωn\sum_{n=0}^{M-1}h(n)e^{-jωn}

4.

The major advantage of designing linear phase FIR filter using frequency sampling method lies in the efficient frequency sampling structure.

a)

True

b)

False

5.

Which of the following is introduced in the frequency sampling realization of the FIR filter?

a)

Poles are more in number on unit circle

b)

Zeros are more in number on the unit circle

c)

Poles and zeros at equally spaced points on the unit circle

d)

None of the mentioned

6.

The frequency sampling design method is attractive when the FIR filter is realized in the frequency domain by means of the DFT.

a)

True

b)

False

7.

The effects caused due to finite word lengths are


1) Coefficient quantization error

2) Adder overflow limit cycle

3) Round off noise

4) Limit cycles

a)

1, 2 and 3 are correct

b)

1 and 3 are correct

c)

1 and 4 are correct

d)

All the four are correct

8.

The quantization inherent in the finite precision arithmetic operations render the system linear.

a)

True

b)

False

9.

In recursive systems, which of the following is caused because of the nonlinearities due to the finite-precision arithmetic operations?

a)

Periodic oscillations in the input

b)

Non-Periodic oscillations in the input

c)

Non-Periodic oscillations in the output

d)

Periodic oscillations in the output

10.

The oscillations in the output of the recursive system are called as ‘limit cycles’.

a)

True

b)

False

11.

Limit cycles in the recursive are directly attributable to which of the following?

a)

Round-off errors in multiplication

b)

Overflow errors in addition

c)

Both of the mentioned

d)

None of the mentioned

12.

What is the range of values called as to which the amplitudes of the output during a limit cycle are confined to?

a)

Stop band

b)

Pass band

c)

Live band

d)

Dead band

13.

Zero input limit cycles occur from non-zero initial conditions with the input x(n)=0.

a)

True

b)

False

14.

Which of the following is true when the response of the single pole filter is in the limit cycle?

a)

Actual non-linear system acts as an equivalent non-linear system

b)

Actual non-linear system acts as an equivalent linear system

c)

Actual linear system acts as an equivalent non-linear system

d)

Actual linear system acts as an equivalent linear system

15.

Which of the following expressions define the dead band for a single-pole filter?

a)

|v(n-1)| ≥ (1/2).2−b1+∣a∣\frac{(1/2).2^{-b}}{1+|a|}

b)

|v(n-1)| ≥ (1/2).2−b1−∣a∣\frac{(1/2).2^{-b}}{1-|a|}

c)

|v(n-1)| ≤ (1/2).2−b1−∣a∣\frac{(1/2).2^{-b}}{1-|a|}

d)

None of the mentioned

16.

What is the necessary and sufficient condition for a second order filter that no zero-input overflow limit cycles occur?

a)

|a1|+|a2|=1

b)

|a1|+|a2|>1

c)

|a1|+|a2|<1

d)

None of the mentioned

17.

An effective remedy for curing the problem of overflow oscillations is to modify the adder characteristic.

a)

True

b)

False

18.

The limit cycle mode with zero input, which occurs as a result of rounding the multiplications, corresponds to an equivalent second order system with poles at z=±1.

a)

True

b)

False

19.

Which of the following should be done in order to convert a continuous-time signal to a discrete-time signal?

a)

Sampling

b)

Differentiating

c)

Integrating

d)

None of the mentioned

20.

The process of converting discrete-time continuous valued signal into discrete-time discrete valued (digital) signal is known as ____________

a)

Sampling

b)

Quantization

c)

Coding

d)

None of the mentioned

21.

Which of the following is a digital-to-analog conversion process?

a)

Staircase approximation

b)

Linear interpolation

c)

Quadratic interpolation

d)

All of the mentioned

22.

If ‘F’ is the frequency of the analog signal, then what is the minimum sampling rate required to avoid aliasing?

a)

F

b)

2F

c)

3F

d)

4F

23.

The quality of output signal from A/D converter is measured in terms of ___________

a)

Quantization error

b)

Quantization to signal noise ratio

c)

Signal to quantization noise ratio

d)

Conversion constant

24.

Which bit coder is required to code a signal with 16 levels?

a)

8 bit

b)

4 bit

c)

2 bit

d)

1 bit

25.

The interface between an analog signal and a digital processor is

a)

D/A converter

b)

A/D converter

c)

Modulator

d)

Demodulator

26.

The speech signal is obtained after

a)

Analog to digital conversion

b)

Digital to analog conversion

c)

Modulation

d)

Quantization

27.

As compared to the analog systems, the digital processing of signals allow

1) Programmable operations

2) Flexibility in the system design

3) Cheaper systems

4) More reliability

a)

1, 2 and 3 are correct

b)

1 and 2 are correct

c)

1, 2 and 4 are correct

d)

All the four are correct

28.

Which units are generally involved in Multiply and Accumulate (MAC)?

a)

Adder

b)

Multiplier

c)

Accumulator

d)

All of the above

29.

In DSP processors, which among the following maintains the track of addresses of input data as well as the coefficients stored in data and program memories?

a)

Data Address Generators (DAGs)

b)

Program sequences

c)

Barrel Shifter

d)

MAC

30.

In DSP Processor, what kind of queuing is undertaken/executed through instruction register and instruction cache?

a)

Implicate

b)

Explicate

c)

Both a and b

d)

None of the above

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