Interruptible Fold Back
Interruptible foldback (IFB), also known as interrupted foldback, interruptible feedback, or interrupt for broadcast, is a monitoring and cue (theatrical), cueing system used in television, filmmaking, video production, and radio broadcast for one-way communication from the TV director, director or assistant director to on-air talent or a remote location. The names are backronyms for the Telex Communications, Telex IFB-XXX model line. Less common names for the system include program cue interrupt (PCI) and switched talkback. IFB is often facilitated using an earpiece that on-air persons wear to get cues, feedback or direction from their control rooms. The earpiece itself may also be referred to as an IFB. Sometimes IFB is accomplished by the director talking to off-camera personnel who visually cue the on-camera talent. The IFB is a special intercom Telecommunication circuit, circuit that consists of a mix-minus program feed sent to an earpiece worn by talent via a wire, telephone ...
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Mix-minus
In audio engineering, a mix-minus or clean feed is a particular setup of a mixing console or matrix mixer, such that an output of the mixer contains everything ''except'' a designated input. Mix-minus is often used to prevent echoes or feedback in broadcast or sound reinforcement systems. Examples The most common situation in which a mix-minus is used is when a telephone hybrid is connected to a console, usually at a radio station. The person on the telephone hears all relevant feeds, usually an identical mix to that of the master bus, including the DJ's mic feed, except that the caller does not hear their own voice. Because the feed being returned to the telephone has an identical mix, minus only one input, it is most efficient to employ a mix-minus as opposed to creating and mixing for a new independent output bus. Mix-minus is also often used together with IFB systems in electronic news gathering (ENG) for television news reporters and interview subjects speaking to a ho ...
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