Discussion
Which of the following is not signal processing ?
Answer: D
Signal processing means operating on a signal to change or analyse it, as in filtering, convolution and noise addition, which change the signal. Storing the data only saves it and does not process it, so it is not signal processing. The words 'date' in the options are misprints for 'data' in the booklet. Filtering removes unwanted frequency components, convolution gives the output of a linear system for a given input, and adding noise changes the waveform, so each of these three acts on the signal, whereas storing only keeps a copy of it. The answer is data storing.
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