Test: Signal And System Processing

Explanation: Speech, EEG and ECG signals are the examples of information-bearing signals that evolve as functions of a single independent variable, namely, time.

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.

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.

Explanation: Substitute n=0,1,2… in x(2n) and obtain the values from the given x(n).

Explanation: The signal x(n) is shifted right by 2.

Explanation: First shift the given signal left by 1 and then time scale the obtained signal by 3.

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.

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.

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.

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”.