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Which of the following is common independent variable for speech signal, EEG and ECG?
Explanation: Speech, EEG and ECG signals are the examples of information-bearing signals that evolve as functions of a single independent variable, namely, time.
Which of the following conditions made digital signal processing more advantageous over analog signal processing?
Explanation: Digital programmable system allows flexibility in reconfiguring the DSP operations by just changing the program, as the digital signal is in the form of 1 and 0’s it is more accurate and it can be stored in magnetic tapes.
Which property does y(t)=x(1-t) exhibit?
Explanation: First the signal x(t) is shifted by 1 to get x(1+t) and it is reflected to get x(1-t). So, it exhibits both time shifting and reflecting properties.
If x(n)=(0,1,2,3,3,0,0,0) then x(2n) is:
Explanation: Substitute n=0,1,2… in x(2n) and obtain the values from the given x(n).
If x(n)=(0,0,1,2,3,4,0,0) then x(n-2) is:
Explanation: The signal x(n) is shifted right by 2.
If x(n)=(0,0,1,1,1,1,1,0) then x(3n+1) is:
Explanation: First shift the given signal left by 1 and then time scale the obtained signal by 3.
If a signal x(t) is processed through a system to obtain the signal (x(t)2), then the system is said to be:
Explanation: Let the input signal be ‘t’. Then the output signal after passing through the system is y=t2 which is the equation of a parabola. So, the system is non-linear.
What are the important block(s) required to process an input analog signal to get an output analog signal?
Explanation: The input analog signal is converted into digital using A/D converter and passed through DSP and then converted back to analog using D/A converter.
Which of the following block is not required in digital processing of an RADAR signal?
Explanation: In the digital processing of the radar signal, the information extracted from the radar signal, such as the position of the aircraft and its speed, may simply be printed on a paper. So, there is no need of an D/A converter in this case.
Which of the following wave is known as “amplitude modulated wave” of x(t)?
Explanation: The multiplicative operation is often encountered in analog communication, where an audio frequency signal is multiplied by a high frequency sinusoid known as carrier. The resulting signal is known as “amplitude modulated wave”.