Radio communication device for e.g. guiding students during exercise, has high frequency transmitter, micro-receiver with antenna, and audio amplifier with sound power for actuating loudspeaker which generates acoustic vibrations

摘要

The device has a high frequency transmitter, and a micro-receiver (4) including a reception antenna (13), and an audio amplifier (15) with sufficient sound power for actuating a loudspeaker (16). The loudspeaker generates, from an acoustical plenum (17), acoustic vibrations which are displaced in a flexible tube (18) until a flexible silicone end (19) disposed in an auditory canal.