The Studio Technologies Model 5121 Line/IFB Output Module is a compact, self-contained 2-channel module intended for use in custom broadcast, live-performance, and other specialized audio applications. The module provides broadcast and production talent cueing interfaces, specifically two line-level "dry" outputs and one powered "wet" IFB output, in an easy-to-use yet technically sophisticated package. (Note that IFB is an acronym for Interrupted Fold Back, an arcane broadcast technical term meaning the cue signals sent to on-air talent or other technical support personnel.) The module's basic functions include analog and digital audio inputs, input level and status LED indicators, two analog line-level outputs, and a 2-channel powered "wet" broadcast-standard IFB output. Remote monitoring and control capability is included to support advanced applications. Module operation requires only a source of analog or digital audio, along with an externally-provided source of 12 volts DC.
Applications for the Model 5121 include sports broadcasting booth packages, remote news gathering "fly-packs," stadium audio/video interface (I/O) locations, and other broadcast-infrastructure projects. The number of Model 5121 modules used in a project can vary widely-from one to dozens. In each case the Model 5121's performance will be completely "pro" with audio quality, reliability, and installation flexibility matching that of larger-scale audio consoles, matrix intercom systems, and stand-alone IFB systems.
Typical applications will find either or both of the Model 5121's analog or digital audio inputs being interfaced with outputs provided by fiber-optic transport modules, audio/video routers, broadcast/production consoles, and matrix intercom systems. Only one of the audio inputs, analog or digital, will be used at any one time. No mixing of the signals will take place. While both physical inputs can be connected, by default the digital audio input will always take precedence.
The Model 5121's line-level outputs would typically be connected to battery-powered listen-only headphone amplifiers, amplified speakers, or inputs on broadcast media storage systems. In remote-broadcast applications these two outputs may be referred to as "dry" (no DC voltage present) IFB signals. The Model 5121's IFB output is directly compatible with listen-only portable IFB amplifiers, such as the Models 32A, 33A, or 34A from Studio Technologies, Inc. The 2-channel IFB output provides signal common on one pin, +28 volt DC power with superimposed channel 1 audio on a second pin, and channel 2 audio only on a third pin.