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Which one of the following filters is used to recover original signal from its sample ?

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ESE Electrical 2021 Official Paper
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  1. Low pass filter
  2. High pass filter
  3. Band pass filter
  4. Band reject filter

Answer (Detailed Solution Below)

Option 3 : Band pass filter
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Detailed Solution

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  • The most widely used method of modulation in frequency-division multiplexing is single side band modulation, which in the case of voice signals, requires a bandwidth that is approximately equal to that of the original voice signal. In practice, each voice input is usually assigned a bandwidth of 4KHZ.
  • The band to restrict the band of each modulated wave to its prescribed range.
  • The resulting band pass filters outputs are next combined in parallel to form the input to the common channel.
  • At the receiving terminal, a bank of band-pass filters with their inputs connected in parallel is used to separate the message signals on a frequency occupancy basis.
  • Finally the original message signals are recovered by individual demodulators.
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More Digital Filters Questions

Q1.In the design of Digital IIR Filters by means of Bilinear Transform, the design specifications are given. Match the following lists: List - I List - II P. N and Δf fixed 1. The design procedure has to start with the evaluation of the order of the filter necessary to meet the specifications in terms of the desired attenuation, transition bandwidth and  pass-band deviation. Q. Δf and δ fixed 2. The filter is completely specified and the transition bandwidth is directly obtainable during the design procedure. R. N and δ fixed 3. The design is completely deter- mined for the Butterworth filter case by obtaining the value of the attenuation at fa directly. Select the correct answer using the code given below: 
Q2.Consider the following circuits and arrange them in ascending order of their complexity. A. First order low pass filter B. Sallen‐Key filter C. Fourth order Butterworth low pass filter D. Non‐inverting amplifier Choose the correct answer from the options given below
Q3.Match List I with List II List – I List – II Filter Frequency Response A. Low Pass Filter I. B. High Pass Filter II. C. Band Pass Filter III. D. Band Reject Filter IV. Choose the correct answer from the options given below: 
Q4.Which of the following statements are correct? A. If the intermediate frequency is too high, poor selectivity results even if sharp cutoff filters are used in the IF stage. B. A high value of intermediate frequency increases tracking difficulties. C. As the intermediate frequency is lowered, image frequency rejection becomes better. D. A very low intermediate frequency can make the selectivity too sharp. Choose the correct answer from the options given below:
Q5.Consider a continuous time system which is represented using a differential equation \(\frac{dy(t)}{dt}\) + 0.1y(t) = x(t). The digital filter is obtained using the first forward difference method with the derivative part replaced with (y[n + 1] − y[n])/T. The values of T, for which the digital filter is stable, are:
Q6.Consider an FIR filter whose Impulse response is h[n] = \(\sum_{k=0}^{6} \)(4 − |k − 3|) δ[n − k]. The phase function of h[n] is:
Q7.Consider a system equation y(n + 2) = -3x(n + 2) + 2x(n) - 5x(n - 1), the system is ______and _______ respectively.
Q8.Consider a 51 taplinear phase FIR filter operating at a sampling frequency of 10 kHz. The delay of this linear phase FIR is:
Q9.Which of the following is the transfer function for the all-pass filter?
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Q1.The Fourier Transform of an real and even function results in:
Q2.Sinc pulse shaping is derived from the Fourier Transform of a _______ function.
Q3.What type of distortion occurs if a signal that contains frequency components up to 15 kHz is sampled using 20 kHz?
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Q5.The equation for voltage waveform v(t) shown below is (where u(t) is unit step input) :
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Q8.The Laplace transform of x(t) is \(\sqrt{\frac{2}{s-3}}\).  Then Laplace transform of e−6tx(t) is :
Q9.Which one of the following is the correct relation ? (a > 0) 
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