
1) Control theory
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https://www.crosswordclues.com/clue/deadband

A deadband (sometimes called a neutral zone) is an interval of a signal domain or band where no action occurs (the system is dead). Deadband is used in voltage regulators and other controllers. The purpose is common, to prevent oscillation or repeated activation-deactivation cycles (called `hunting` in proportional control systems). ==Voltage re.....
Found on
http://en.wikipedia.org/wiki/Deadband

An unusable area extending from the face of an ultrasonic proximity sensor to the minimum sensing distance allowing for target detection where pulses are received too quickly to be accurately evaluated.
Found on
http://www.mhia.org/learning/glossary/d
No exact match found.