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Controls: dtmf sequences, relays, routes, Call signals, Interruptible foldback (ifb) – Clear-Com HX System Frames User Manual

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Controls: DTMF sequences, relays, routes

An intercom panel can be used to perform a variety of other functions besides sending
audio. These are called control functions. For example, it can activate:

• A Dual Tone Multi Frequency (DTMF) sequence to call out on a telephone line.
• An electronic relay to turn on a light or lock a door.
• Audio from an external router like a mixer desk.

Call signals

A call signal is an audible or visual signal or Tally sent on an intercom channel, with or
without accompanying audio. These signals have a variety of purposes from alerting an
operator who has taken off their headset, to activating control sequences.

Interruptible Foldback (IFB)

An audio source such as on-the-air or program audio can be routed through the matrix to a
presenters ear pieces. In a typical broadcast application, program audio is routed to the
talent– a collective term for any person in front of the camera broadcasting directly to an
audience. A director or other audio person can then interrupt or dim the program audio to
the talent for announcements (commands) or cuing by using the interruptible foldback or
IFB feature.

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Eclipse EHX Software User Guide