Which of the following is NOT a typical application for electromagnetic controls?

Electromagnetic controls are commonly used in various applications, particularly where the operation of electrical devices can benefit from electromagnetic principles. Motor starters, relay switches, and industrial machinery all utilize electromagnetic controls effectively.

Motor starters use electromagnetic contactors to manage the starting and stopping of motors. Relay switches rely on electromagnetic coils to open or close circuits based on certain conditions, making them essential in automation and control systems. Industrial machinery often incorporates electromagnetic devices to manage various operations and safety protocols.

Digital signal processing, on the other hand, primarily deals with the manipulation of signals in a digital format using mathematical operations. It does not typically use electromagnetic controls, as its operations are based on electronic circuits and algorithms rather than electromagnetic principles. Therefore, this application stands out as fundamentally different from the others that heavily rely on electromagnetic controls.