signal
information: Content transmitted or expressed
News: Used to express information, "symbols" composed of agreed ways
signal: The form of expression and the carrier of the message, a certain physical quantity that changes with time
Signal classification and characteristics
Signal analysis
⽬: Reveal the characteristics of the signal body
Method: Decompose the signal into simple linear groups
Signal decomposition
system
definition: A whole with specific functions formed by a combination of things that depend on each other and interact with each other
System classification and system analysis
