Definition of decoder noun from the Oxford Advanced Learner's Dictionary

 

decoder

 noun
noun
BrE BrE//ˌdiːˈkəʊdə(r)//
 
; NAmE NAmE//ˌdiːˈkoʊdər//
 
 
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a device that changes an electronic signal into a form that people can understand, such as sound and pictures a satellite/video decoder A decoder is required for certain television programmes.
See the Oxford Advanced American Dictionary entry: decoder