Frequency

I'm confused about the notion of frequency when it comes to arbitrary data

I'm confused about the notion of frequency when it comes to arbitrary data
  1. What is meant by frequency domain analysis?
  2. What is complex signal?

What is meant by frequency domain analysis?

Frequency Domain Analysis of Signals. □ In engineering and statistics, frequency domain is a term used to describe the analysis of mathematical functions or signals with respect to frequency, rather than time. □ The most common purpose for analysis of signals in the frequency domain is the analysis of signal properties ...

What is complex signal?

A complex signal consists of two real signals - one for the real and one for the imaginary part. The linear processing of a complex signal, such as filtration with a time-invariant linear filter, corresponds to applying the processing both to the real and the imaginary part of the signal.

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