##  [Time–Bandwidth Uncertainty Principle](/time-bandwidth-uncertainty-principle) 

  ##  [Time–Bandwidth Uncertainty Principle](https://information.quantumdictionary.io/time-bandwidth-uncertainty-principle-0) 

  

 [![Information & Communication Dictionary](/sites/default/files/styles/large/public/2026-01/Information%20%26%20Communication.png.webp?itok=g4emS-T7)](/topic-specific-dictionaries/information-communication)



**Information & Communication Dictionary**

 







 

 

 

 



 

 

 

 

Definition

A quantitative relation that bounds how simultaneously concentrated a single finite-energy signal can be in time and in frequency: the product of a signal's effective time spread and its effective frequency spread has a nonzero lower bound (the numerical value depends on the precise definitions of ‘‘spread’’ used).