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  1. Acoustics: the disruption of normally smooth sound waves. Comb filtering is an example. Radio Frequency: reception of secondary or unintentionally radio signals on the same frequency as the intended primary signal. Audio Signals: addition of electromagnetic signals into the audio signal such as hum or buzz. Source: Church Audio & Acoustics Glossary
  2. The combining of two or more signals results in an interaction called interference. This may be constructive or destructive. Another use of the term is to refer to undesired signals. Source: http://www.owenscorning.com/around/sound/glossary.asp

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