Definition & Overview
In simultaneous conference interpreting, translated audio is broadcast from interpreter booths to delegate headsets using one of two primary wireless technologies: Infrared (IR) optical radiators or Ultra High Frequency (UHF) radio transmitters. The choice between IR and UHF is dictated by venue geometry, security requirements, and intermodulation risks.
Technical Comparison
- Confidentiality & Security: IR light cannot penetrate opaque walls, making Infrared the mandatory standard for diplomatic summits, closed-door arbitration, and board meetings where RF eavesdropping is a risk.
- Line-of-Sight Requirements: IR requires unobstructed line-of-sight between radiator emitter panels and delegate receiver sensors. UHF penetrates pillars, walls, and partition screens.
- Outdoor & Ambient Light Immunity: UHF operates reliably outdoors under bright sunlight where infrared radiation is saturated by solar UV/IR rays.
- Frequency Coordination: UHF requires careful channel spacing (typically 863-865 MHz) to prevent intermodulation distortion from wireless handheld microphones and venue walkie-talkies.
In Cabine: Cabine's AV frequency coordinator maps available UHF and IR transmitter channels to prevent acoustic bleed between concurrent breakout tracks.
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