Clear-Com HX System Frames - Manual (Page 25)

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.
25 Eclipse EHX Software User Guide