Assertion: simultaneous substitution | /r/Synonym | signal substitution
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text: Simultaneous substitution (also known as simsubbing or signal substitution) is a practice mandated by the Canadian Radio-television and Telecommunications Commission (CRTC) requiring broadcast distribution undertakings (BDUs) in Canada to distribute the signal of a local or regional over-the-air station in place of the signal of a foreign or non-local television station (typically one that is affiliated with a U.S. commercial television network such as ABC, CBS, NBC, and Fox), when the two stations are broadcasting identical programming simultaneously.