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Modulated ultrasound is a technique for the transmission of audio information, comparable to radio. Ultrasound can be modulated to carry an audio signal (as radio signals are modulated). It is usually used to carry messages underwater at ranges under five miles.
The received ultrasound signal is decoded into audible sound by a modulated-ultrasound receiver. A modulated ultrasound receiver is a device that receives a modulated ultrasound signal and decodes it for use as sound, navigational-position information, etc. Its function is somewhat like that of a radio receiver.
Applications include use in underwater diving communicators as well as communication with submarines.