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WorksheetsADSP_Unit 2_Review Quiz
Total questions: 60
Worksheet time: 3600secs
Name
Class
Date
1.
Decimation is a process in which the sampling rate is __________.
a)
enhanced
b)
stable
c)
reduced
d)
unpredictable
2.
Anti-imaging filter with cut-off frequency ?c = ?/ I is specifically used _______ upsampling process for the removal of unwanted images.
a)
Before
b)
At the time of
c)
After
d)
All of the mentioned
3.
What is the process of down sampling called?
a)
Decimation
b)
interpolation
c)
Both Decimation & Fornication
d)
None of the mentioned
4.
What is the process of up sampling called?
a)
Decimation
b)
interpolation
c)
Both Decimation & interpolation
d)
None of the mentioned
5.
What is the process of converting a signal from a given rate to a different rate?
a)
Sampling
b)
Normalizing
c)
Sampling rate conversion
d)
None of the mentioned
6.
The systems that employ multiple sampling rates are called
a)
multi-rate DSP systems.
b)
Multiplex dsp system
c)
Sampling rate conversion
d)
None of the mentioned
7.
Which of the following methods are used in sampling rate conversion of a digital signal?
a)
D/A convertor and A/D convertor
b)
Performing entirely in digital domain
c)
None of the mentioned
d)
D/A convertor, A/D convertor in digital domain
8.
Which of the following is the advantage of sampling rate conversion by converting the signal into analog signal?
a)
Less signal distortion
b)
Quantization effects
c)
New sampling rate can be arbitrarily selected
d)
None of the mentioned
9.
Which of the following is the disadvantage of sampling rate conversion by converting the signal into analog signal?
a)
Signal distortion
b)
Quantization effects
c)
New sampling rate can be arbitrarily selected
d)
Signal distortion & Quantization effects
10.
In which of the following, sampling rate conversion are used?
a)
Narrow band filters
b)
Digital filter banks
c)
Quadrature mirror filters
d)
All of the mentioned
11.
Which of the following use quadrature mirror filters?
a)
Sub band coding
b)
Trans-multiplexer
c)
Sub band coding & Trans-multiplexer
d)
None of the mentioned
12.
To change the sampling rate for better efficiency in two or multiple stages, The decimation and interpolation factors must be _________unity.
a)
Less than
b)
. Equal to
c)
Greater than
d)
None of the mentioned
13.
What is the process of reducing the sampling rate by a factor D?
a)
Sampling rate conversion
b)
Interpolation
c)
Decimation
d)
None of the mentioned
14.
What is the process of increasing the sampling rate by a factor I?
a)
Sampling rate conversion
b)
Interpolation
c)
Decimation
d)
None of the mentioned
15.
If we down-sample a signal x(n), then the resulting signal will be
a)
an sampled version of x(n).
b)
an aliased version of x(n).
c)
an multiple version of x(n).
d)
an decimated version of x(n).
16.
12.What is the folding frequency for the aliased version of x(n) with sampling rate F?
a)
F/D
b)
F/4D
c)
F/2
d)
F/2D
17.
To what value should the bandwidth of x(n) has to be reduced in order to avoid aliasing?
a)
F/D
b)
F/2D
c)
F/4D
d)
None of the mentioned
18.
Which of the following is true about the filtering operation on x(n)?
a)
Linear
b)
Time variant
c)
None of the mentioned
d)
Linear and time invariant
19.
The linear filtering operation followed by down sampling on x(n) is a
a)
not time invariant.
b)
time invariant.
c)
linear variant.
d)
none
20.
In D/A converter, the application of the input code word results in a high-amplitude transient, called?
a)
Glitch
b)
Deglitch
c)
Glitter
d)
None of the mentioned
21.
In direct form realization for an interpolator, which among the following generates an intermediate signal?
a)
Upsampler
b)
Downsampler
c)
Anti-imaging filter
d)
Anti-aliasing filter
22.
What is the main function of (A/D) or ADC converter?
a)
Converts Digital to Analog Signal
b)
Converts Analog to Digital signal
c)
All of the mentioned
d)
None of the mentioned
23.
Which filter has the provision to support adaptive filter
a)
IIR
b)
FIR
c)
Both FIR and IIR
d)
None of the mentioned
24.
The computational procedure for Decimation in frequency algorithm takes
a)
Log2 N stages
b)
2Log2 N stages
c)
Log2 N2 stages
d)
Log2 N/2 stages
25.
What is the main function of (D/A) or DAC converter?
a)
Converts Digital to Analog Signal
b)
Converts Analog to Digital signal
c)
Converts Analog to Digital signal
d)
None of the mentioned
26.
In A/D converter, what is the time relation between sampling period T and the duration of the sample mode and the hold mode?
a)
Should be larger than the duration of sample mode and hold mode
b)
Should be smaller than the duration of sample mode and hold mode
c)
Should be equal to the duration of sample mode and hold mode
d)
Should be larger than or equals to the duration of sample mode and hold mode
27.
What is the process of converting a signal from a given rate to a different rate?
a)
Sampling
b)
Normalizing
c)
Sampling rate conversion
d)
None of the mentioned
28.
In the application of multirate signal processing QMF Stands for
a)
Quadrature mirror filter
b)
Quantization mirror filter
c)
Quality filter
d)
Quantization multiple filter
29.
Oversampling A/D and D/A converters used for
a)
High quality digital audio system
b)
low quality digital audio system
c)
low quality analog audio system
d)
low quality analog video system
30.
Give the Advantages of multirate signal processing
a)
Reduction in computation
b)
Reduction in memory requirement
c)
Reduction in the order of the system
d)
All of the mentioned
31.
Anti aliasing filter is
a)
LPF
b)
HPF
c)
BPF
d)
BSF
32.
Anti imaging filter is
a)
LPF
b)
HPF
c)
BPF
d)
BSF
33.
Reason for aliasing effect is
a)
Undersampling
b)
Oversampling
c)
Upsampling
d)
Interpolatoin
34.
If a discrete time sequence is upsampled by a factor I then its spectrum will exhibits
a)
Aliasing
b)
Imaging
c)
Unchanged
d)
Disrupted
35.
An example for filter bank based transform is
a)
DFT
b)
FFT
c)
Wavelet Transform
d)
Z Transform
36.
X(w/2) is the _____ version of X(w)
a)
Expanded
b)
Compressed
c)
Right Shifted
d)
Left Shifted
37.
X(w-k) is the ____ version of X(k)
a)
Right shifted
b)
Left Shifted
c)
Up Shifted
d)
Down Shifted
38.
X(2w) is the _____ version of X(w)
a)
Expanded
b)
Compressed
c)
Right Shifted
d)
Left Shifted
39.
Computationally efficient filter for resampling is
a)
Transversal filter
b)
FIR filter
c)
IIR Filter
d)
Polyphase filter
40.
There is no information loss when a signal is
a)
Under sampled
b)
Sampled
c)
Down sampled
d)
Upsampled
41.
Consider the discrete time signal x(n)=(1,2,3,4) determine the upsampled version of the signals for the sampling rate multiplication factor a)I=2
a)
x(n/I)=(1,0,2,0,3,0,4,0)
b)
x(n/I)=(4,0,0,0,3,0,0,0)
c)
x(n/I)=(4,1,0,0,3,0,0,0)
d)
x(n/I)=(3,0,0,0,3,0,0,0)
42.
Consider the discrete time signal x(n)=(1,2,3,4) determine the upsampled version of the signals for the sampling rate multiplication factor a)I=3
a)
x(n/I)=(1,0,2,0,3,0,4,0)
b)
x(n/I)=(1,0,0,2,0,0,3,0,0,4,0,0)
c)
x(n/I)=(4,1,0,0,3,0,0,0)
d)
x(n/I)=(3,0,0,0,3,0,0,0)
43.
Consider the discrete time signal x(n)=(1,-1,2,-2) determine the upsampled version of the signals for the sampling rate multiplication factor a)I=2
a)
x(n/I)=(1,0,2,0,3,0,4,0)
b)
x(n/I)=(1,0,0,-1,0,2,0,-2,0)
c)
x(n/I)=(4,1,0,0,3,0,0,0)
d)
x(n/I)=(3,0,0,0,3,0,0,0)
44.
Consider the discrete time signal x(n)=(1,-1,2,-2) determine the upsampled version of the signals for the sampling rate multiplication factor a)I=3
a)
x(n/I)=(1,0,0,2,0,0,-2,0,0)
b)
x(n/I)=(1,0,0,2,0,0,3,0,0,4,0,0)
c)
x(n/I)=(4,1,0,0,3,0,0,0)
d)
x(n/I)=(3,0,0,0,3,0,0,0)
45.
Consider thediscrete time signal x(n)=(1,2,3,4) determine the upsampled version of the signals for the sampling rate multiplication factor a)I=4
a)
x(n/I)=(1,0,0,2,0,0,-2,0,0)
b)
x(n/I)=(1,0,0,2,0,0,3,0,0,4,0,0)
c)
x(n/I)=(1,0,0,0,2,0,0,0,3,0,0,0,4,0,0,0)
d)
x(n/I)=(3,0,0,0,3,0,0,0)
46.
Consider thee discrete time signal x(n)=(1,-1,1,-1,2,-2,2,-2,3,-3,3,-3) determine the downsampled version of the signals for the sampling rate reduction factor a)D=3
a)
x(Dn)=(1,1,2,2,3,3)
b)
x(Dn)=( 1,-1,2,-3)
c)
x(Dn)=(4,5,6,1,2)
d)
x(Dn)=(2,3,3,3,3,3)
47.
Consider thee discrete time signal x(n)=(1,-1,1,-1,2,-2,2,-2,3,-3,3,-3) determine the downsampled version of the signals for the sampling rate reduction factor a)D=2
a)
x(Dn)=(1,1,2,2,3,3)
b)
x(Dn)=(2,3,0,4,5)
c)
x(Dn)=(4,5,6,1,2)
d)
x(Dn)=(2,3,3,3,3,3)
48.
Consider thee discrete time signal x(n)=(1,2,3,4,5,6,7,8,9,10,11,12) determine the downsampled version of the signals for the sampling rate reduction factor a)D=4
a)
x(Dn)=(1,4,7,10)
b)
x(Dn)=(1,5,9)
c)
x(Dn)=(1,3,5,7,9,11)
d)
x(Dn)=(1,3,5,7,9,11)
49.
Consider thee discrete time signal x(n)=(1,2,3,4,5,6,7,8,9,10,11,12) determine the downsampled version of the signals for the sampling rate reduction factor a)D=3
a)
x(Dn)=(1,4,7,10)
b)
x(Dn)=(1,3,5,7,9,11)
c)
x(Dn)=(1,3,5,7,9,11)
d)
x(Dn)=(1,3,5,7,9,11)
50.
Consider thee discrete time signal x(n)=(1,2,3,4,5,6,7,8,9,10,11,12) determine the downsampled version of the signals for the sampling rate reduction factor a)D=2
a)
x(Dn)=(1,3,5,7,9,11)
b)
x(Dn)=(2,4,6,7,9,12)
c)
x(Dn)=(2,4,6,7,9,14)
d)
x(Dn)=(2,4,6,7,9,13)
51.
The filter eliminates the spectrum of X(?) in the
a)
range ?/D < ? < ?.
b)
range -? < ? < ?.
c)
range D < ? < ?.
d)
range ?/I < ? < ?.
52.
In a D/A converter, the usual way to solve the glitch is to use deglitcher. How is the Deglitcher designed?
a)
By using a low pass filter
b)
By using a S/H circuit
c)
By using a low pass filter & S/H circuit
d)
None of the mentioned
53.
If Fx and Fy are the sampling rates of the input and output signals respectively, then what is the value of Fy/Fx?
a)
D/I
b)
I/D
c)
I.D
d)
None of the mentioned
54.
D/A conversion is usually performed by combining a D/A converter with a sample-and-hold (S/H ) and followed by
a)
a low pass (smoothing) filter.
b)
Band pass filter
c)
High pass filter
d)
Band stop filter
55.
If the interpolation factor is I = 256, the A/D converter output can be obtained by averaging successive non-overlapping blocks of.
a)
132bits
b)
128 bits.
c)
256 bits
d)
64 bits
56.
The applications of digital filters are
a)
Noise suppression
b)
Bandwidth limiting and Removal or attenuation
c)
Enhancement of selected frequency ranges
d)
All of the above
57.
In polyphase filter, which kind of realization is/are adopted for three subfilters possessing coefficients?
a)
Cascade
b)
Parallel
c)
Direct
d)
All of the above
58.
In direct form realization for an interpolator, which among the following generates an intermediate signal?
a)
Upsampler
b)
Downsampler
c)
Anti-imaging filter
d)
Anti-aliasing filter
59.
The time required for the output of the D/A converter to reach and remain within a given fraction of the final value, after application of the input code word is called?
a)
Converting time
b)
Setting time
c)
Both Converting & Setting time
d)
None of the mentioned
60.
In a D/A converter, the usual way to solve the glitch is to use deglitcher. How is the Deglitcher designed?
a)
By using a low pass filter
b)
By using a S/H circuit
c)
By using a low pass filter & S/H circuit
d)
None of the mentioned
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