Question

Explain the theory of Spectrum

Answer 1

In mathematics, spectral theory is an inclusive term for theories extending the eigenvector and eigenvalue theory of a single square matrix to a much broader theory of the structure of operators in a variety of mathematical spaces.

Answer 2

A spectrum analyzer is also used to determine,by direct observation and bandwitch of a digital or analog signal.
A spectrum analyzer interface is a device that connects to a wireless receiver or a personal computer to allow visual detection and analysis of electromagnetic signal over a defined band of frequencies.
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