Movies - Interruptible foldback

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IFB (interruptible Feedback or interruptible foldback) or IEM (in-ear monitor) systems are used in broadcast and motion picture production for crew communication, audio monitoring and cueing.

On a television news program for example, a producer can talk to the anchors, to tell them when they are live on the air and to begin reading off the script on the teleprompter or cue cards. In electronic news gathering (ENG), the IFB can be set up through the station's private audio channel during live remote broadcasts. Program audio may also be sent through the IFB, in this configuration, a mix-minus is sent on the 'Backstop' in other words the mix is always sent down the IFB unless crew wish to communicate with the remote site in which case they key it and the IFB automatically cuts to the communications channel, once the communication is finished mix audio is restored to the IFB

Wireless in-ear monitor systems are also increasingly popular with stage musicians, since they allow more precise monitoring and freer movement on stage than fixed monitor speakers, and can incorporate sound-insulated earbuds to provide hearing protection. For performances that include pre-recorded backing tracks, IEM let the entire band synchronize with a click track without wearing cumbersome headphones.

In-ear monitor can also refer to any headphone with sound-insulating earbuds which are placed inside the ear canal.

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