The physiological problems relating to the wearing of communications microphones and headsets by personnel in aerospace vehicles are defined in this report.Methods of providing full diplex voice communication with a single dual-purpose transducer are discussed. Air conduction, bone conduction, electrophonic phenomena, and direct radio frequency stimulation for the purpose of communication are considered in this study.An ear canal insert diplexer system (dual-purpose transducer) is found through research and direct experiment to yield good intelligibility without interfering with other body functions. A superaudlble chopper diplexing method is also selected as a promising technique for utilization of a dual-purpose transducer.
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