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WorksheetsADSP_U3_Filter banks
Total questions: 60
Worksheet time: 30mins
Name
Class
Date
1.
QMF is
a)
Quadrature Minor Filter
b)
Quadrature Major Filter
c)
Quadrature Mirror Filter
d)
Quadrature Median Filter
2.
Downsamplers are used in
a)
Analysis filter bank
b)
Synthesis filter Bank
c)
Symmetric filter bank
d)
Assymmetric filter bank
3.
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
4.
Upsamplers are used in
a)
Analysis filter bank
b)
Synthesis filter Bank
c)
Symmetric filter bank
d)
Assymmetric filter bank
5.
Reason for Aliasing is
a)
Downsampling
b)
Upsampling
c)
Oversampling
d)
None of the mentioned
6.
Reason for Aliasing in baseband signals are
a)
Signals are perfectly bandlimited
b)
Signals are perfectly bandpassed
c)
Signals are random
d)
Signals are not perfectly bandlimited
7.
An LTI system is said to be causal if and only if?
a)
Impulse response is non-zero for positive values of n
b)
Impulse response is zero for positive values of n
c)
Impulse response is non-zero for negative values of n
d)
Impulse response is zero for negative values of n
8.
x(n)*?(n-n0)=?
a)
x(n+n0)
b)
x(n-n0)
c)
x(-n-n0)
d)
x(-n+n0)
9.
The type of frequency domain coding that divides the speech signal into sub bands is _____
a)
Waveform coding
b)
Vocoders
c)
Block transform coding
d)
Sub-band coding
10.
Speech coders are categorized on the basis of __________
a)
Signal compression techniques
b)
Frequency of signal
c)
Bandwidth of the signal
d)
Phase of the signal
11.
Which of the following is an important factor in determining spectral efficiency of the system?
a)
Multiple access technique
b)
Cell size
c)
Modulation technique
d)
Vocoder
12.
Two channel Filter banks consists of
a)
1 FIR filter
b)
2 FIR filters
c)
16 FIR filter
d)
3 FIR filter
13.
SBC is
a)
Subband Coding
b)
Superband Coding
c)
Submerged Coding
d)
Superior Coding
14.
FOPS is
a)
Filter Operation per second
b)
Filter Orientation per second
c)
Filter Operation per sequence
d)
Filter Orientation per sequence
15.
Wavelet subband coding follows
a)
Tree structure
b)
Parallel Structure
c)
Direct form
d)
Cascade form
16.
Analysis filters are generally mentioned as
a)
A(z)
b)
G(z)
c)
B(z)
d)
H(z)
17.
Synthesis filters are generally mentioned as
a)
A(z)
b)
G(z)
c)
B(z)
d)
H(z)
18.
If all the poles of H(z) are outside the unit circle, then the system is said to be _____________
a)
Only causal
b)
Only BIBO stable
c)
BIBO stable and causal
d)
None of the mentioned
19.
If all the poles have small magnitudes, then the rate of decay of signal is __________
a)
Slow
b)
Constant
c)
Rapid
d)
None of the mentioned
20.
A linear time invariant system is said to be BIBO stable if and only if the ROC of the system function ___________
a)
Includes unit circle
b)
Excludes unit circle
c)
Is an unit circle
d)
None of the mentioned
21.
Which of the following is the right way to reduce distortion in the DM?
a)
By setting up an integrator in front of DM
b)
By setting up an integrator behind the DM
c)
By setting up an integrator in the middle of DM
d)
None of the mentioned
22.
Sampling rate conversion by the rational factor I/D is accomplished by what connection of interpolator and decimator?
a)
Parallel
b)
Cascade
c)
Convolution
d)
None of the mentioned
23.
Which of the following has to be performed first in sampling rate conversion by rational factor?
a)
Interpolation
b)
Decimation
c)
Either interpolation or decimation
d)
None of the mentioned
24.
The error in the filter output that results from rounding or truncating calculations within the filter is called
a)
Coefficient quantization error
b)
Adder overflow limit cycle
c)
Round off noise
d)
Limit cycles
25.
A direct partial-fraction expansion of the transfer function in Z leads to
a)
The parallel form II structure
b)
The parallel form I structure
c)
Cascaded structure
d)
None of the mentioned
26.
A partial-fraction expansion of the transfer function in Z-1 leads to
a)
The parallel form II structure
b)
The parallel form I structure
c)
Cascaded structure
d)
None of the mentioned
27.
Parallel form of realisation is done in
a)
High speed filtering applications
b)
Low speed filtering applications
c)
Both High speed and Low speed applications
d)
None of the mentioned
28.
Consider the assertions given below. Which among them is an advantage of FIR Filter?
a)
Necessity of computational techniques for filter implementation
b)
Requirement of large storage
c)
Incapability of simulating prototype analog filters
d)
Presence of linear phase response
29.
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 mentioned
30.
Frequency domain coders divides the speech signal into __________
a)
A set of frequency components
b)
A set of different amplitudes
c)
A set of time delays
d)
A set of phase component
31.
Quantization is a ________ process.
a)
Linear
b)
Direct
c)
Non-linear
d)
Indirect
32.
How is the sampling rate conversion achieved by factor I/D?
a)
By increase in the sampling rate with (I)
b)
By filtering the sequence to remove unwanted images of spectra of original signal
c)
By decimation of filtered signal with factor D
d)
All of the mentioned
33.
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
34.
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
35.
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 above
36.
The quality of a digital image is well determined by ___________
a)
The number of samples
b)
The discrete gray levels
c)
All of the mentioned
d)
None of the mentioned
37.
For a continuous image f(x, y), Quantization is defined as
a)
Digitizing the coordinate values
b)
Digitizing the amplitude values
c)
All of the mentioned
d)
None of the mentioned
38.
The lowpass filtering process can be applied in which of the following area(s)?
a)
The field of machine perception, with application of character recognition
b)
In field of printing and publishing industry
c)
In field of processing satellite and aerial images
d)
All of the mentioned
39.
The edges and other abrupt changes in gray-level of an image are associated with_________
a)
High frequency components
b)
Low frequency components
c)
Edges with high frequency and other abrupt changes in gray-level with low frequency components
d)
Edges with low frequency and other abrupt changes in gray-level with high frequency component
40.
The function of filters in Image sharpening in frequency domain is to perform reverse operation of which of the following Lowpass filter?
a)
Gaussian Lowpass filter
b)
Butterworth Lowpass filter
c)
Ideal Lowpass filter
d)
None of the Mentioned
41.
Audio recorded 44.1 kHz (kilohertz), 16-bit stereo is considered as a ______ quality
a)
CD
b)
Mp3
c)
Player
d)
DVD
42.
Which of the following is one of the most frequently used transform in speech coding?
a)
Fourier transform
b)
Wavelet transform
c)
Shearlet transform
d)
Discrete cosine transform
43.
What does ATC stands for in speech coders?
a)
Automatic transform code
b)
Air traffic controller
c)
Active thermal convection
d)
Adaptive transform coding
44.
Waveform coders and Vocoders are the types of ____________
a)
Speech coders
b)
Modulation technique
c)
Frequency translation methods
d)
Channel allocation for transmission
45.
What is the order of the four operations that are needed to be done on h(k) in order to convolute x(k) and h(k)? Step-1:Folding Step-2:Multiplication with x(k) Step-3:Shifting Step-4:Summation
a)
1-2-3-4
b)
1-2-4-3
c)
2-1-3-4
d)
1-3-2-4
46.
The impulse response of a LTI system is h(n)={1,1,1}. What is the response of the signal to the input x(n)={1,2,3}?
a)
{1,3,6,3,1}
b)
{1,2,3,2,1}
c)
{1,3,6,5,3}
d)
{1,1,1,0,0}
47.
The speech coding technique that is dependent on the prior knowledge of the signal is __________
a)
Waveform coders
b)
Vocoders
c)
Sub band coding
d)
Block transform
48.
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
49.
In the practical A/D converters, what are the distortions and time-related degradations occur during the conversion process?
a)
Jitter errors
b)
Droops
c)
Nonlinear variations in the duration of the sampling aperture
d)
All of the mentioned
50.
The crosshatched areas gives two types of Quantization error in DM, they are?
a)
Slope-overload distortion
b)
Granular noise
c)
Slope-overload distortion & Granular noise
d)
None of the mentioned
51.
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
52.
The advantage of using the cascade form of realisation is 1) It has same number of poles and zeros as that of individual components 2) The number of poles is the product of poles of individual components 3) The number of zeros is the product of poles of individual components 4) Over all transfer function may be determined
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
53.
The direct form II for realisation involves 1) The realisation of transfer function into two parts 2) Realisation after fraction 3) Product of two transfer functions 4) Addition of two transfer functions
a)
1, 2 and 3 are correct
b)
1 and 3 are correct
c)
3 and 4 are correct
d)
ll the four are correct
54.
Discrete cosine transforms (DCTs) express a function or a signal in terms of
a)
Sum of cosine functions oscillating at different frequencies
b)
Sum of cosine functions oscillating at same frequencies
c)
Sum of cosine functions at different sampling intervals
d)
Sum of cosine functions oscillating at same sampling intervals
55.
Correlation is used for 1) Computation of average power in waveforms 2) Climatography 3) Identification of binary code word in PCM systems 4) Quantization
a)
1, 2 and 3 are correct
b)
1 and 2 are correct
c)
2 and 3 are correct
d)
All the four are correct
56.
The Chebyshev filters have 1) Flat pass band 2) Flat stop band 3) Equiripple pass band 4) Tapering stop band
a)
1 and 2 are correct
b)
2 and 4 are correct
c)
2 and 3 are correct
d)
All the four are correct
57.
Consider the assertions (steps) given below. Which among the following is a correct sequence of designing steps for the sampling rate converters? A. Computation of decimation/interpolation factor for each stage. B. Clarification of anti-aliasing / anti-imaging filter requirements. C. Designing of filter at each stage. D. Calculation of optimum stages of decimation/ interpolation yielding maximum efficient implementation.
a)
A, B, C, D
b)
C, A, D, B
c)
D, A, B, C
d)
B, D, A, C
58.
For designing a multirate LPF with passband 0 to 50 Hz, stopband 60 to 280 Hz, stopband deviation 0.001, passband deviation 0.01 and sampling frequency (fs) = 400 Hz, what would be the value of normalized transition width?
a)
0.025 Hz
b)
1.25 Hz
c)
1.50 Hz
d)
2.6 Hz
59.
In polyphase filters, the subfilters which share a common delay line results in the reduction of the storage requirement by factor ______
a)
1
b)
2
c)
3
d)
4
60.
How is the operating level of sampling rate for the subfilters involved in the polyphase filters?
a)
Low
b)
Moderate
c)
High
d)
None of the mentioned
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