TDT is develops integrated signal processing workstations for hearing and speech research. The firm's high-performance modular instrumentation allow scientists to custom configure systems to address a wide range of demanding research applications, including psychoacoustics, auditory neurophysiology, speech, spatial hearing, and virtual acoustics. Trading all over the world, TDT ystems range in complexity from a simple audio stimulator to a complete multichannel sensory and behavioral neurophysiology system for awake, behaving subjects.