ABSTRACT
This chapter describes how Internet protocol is utilized in a traditional intercom system topology that is built around a central router or mixing engine, which is also the controller of the system. Analog wireless party-line intercom systems have utilized Very high frequency and Ultra high frequency bands with frequency modulation or Amplitude modulation transmission modulation to construct wireless party-line systems. Some signaling can be provided but usually not to the extent that every operator can selectively signal every other operator. In the simplest operation a commentator may create the program mix on the commentary unit itself, and a program output is ready for broadcast. Digital party-line systems offer improved audio quality and resiliency to external interference that the unbalanced party-line systems are susceptible to, as well as minimal cross-talk between adjacent channels. Two-wire Interruptible foldback (IFB) systems generally require a central electronics control unit to allow multiple users to select one of many IFB channels to talk to different talent.
