The term PID (packet identifier) in digital TV multiplexing system is like the file name of a file, which we can call "identification code transmission packet".
PID (Proportional Integral Differential) in engineering control and mathematical physics is a mathematical physics term. PID is composed of 8-bit port priority plus port number, the port number is low, and the default port number priority is 128.
Extended data
The level of industrial automation has become an important symbol to measure the modernization level of all walks of life. At the same time, the development of control theory has gone through three stages: classical control theory, modern control theory and intelligent control theory. A typical example of intelligent control is fuzzy automatic washing machine. Automatic control system can be divided into open-loop control system and closed-loop control system.
A control system includes a controller, a sensor, a transmitter, an actuator and an input/output interface. The output of the controller is added to the controlled system through the output interface and actuator; The controlled quantity of the control system is sent to the controller through sensors, transmitters and input interfaces. Different control systems have different sensors, transmitters and actuators.
There are many PID controllers and their controllers or intelligent PID controllers (instruments), and their products have been widely used in engineering practice. There are many kinds of PID controller products, and all major companies have developed intelligent regulators with PID parameter self-tuning function, in which the automatic adjustment of PID controller parameters is realized by intelligent adjustment or self-tuning and adaptive algorithm.
Baidu encyclopedia -PID