Band rejection

{{Short description|Phenomenon where a range of frequencies is lost from a source signal}}

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Band rejection is a phenomenon in waveform signals, where a certain frequency or range of frequencies are lost or removed from a source signal.{{cite book|title=Delmar's Standard Textbook of Electricity|first=Stephen L.|last= Herman|publisher= Cengage Learning|year= 1998|isbn=0-8273-8550-1}}

The term band rejection, when used in electronic signal processing, refers to the deliberate removal of a known frequency range - for instance, to compensate for a known source of interference (such as noise from mains (household) electricity). A specific frequency is removed using a notch filter.

In most other senses, band rejection is the unintentional loss of signal caused by imperfections in the recording, storage or reproduction of a waveform.