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What is the process of examining the frequency content of a signal?

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What is the process of examining the frequency content of a signal?

(a) Signal decoding

(b) Spectrum analysis

(c) Signal analysis

(d) Data analysis

The question was asked at a job interview.

The above asked question is from Digital Signal Processing topic in portion Digital Communication Techniques of Avionics

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Right option is (b) Spectrum analysis

Explanation: Spectrum analysis is the process of examining a signal to determine its frequency content. Algorithms such as discrete Fourier transform (DFT) and FPGA is used to analyze the frequency content of an input signal.

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