TWO-WAY COMMUNICATION DEVICE

摘要

A two-way communication device comprises a magnetoelastic rod (4) located between an inertial back mass (8) and a front panel (6) of low mass. A coil (13, 5) located in the vicinity of the rod (4), and the rod and coil together defining an audio-electric transducer. Electronic processing means ensures that an audio-electric signal input to the device is applied to the coil (13, 5) a sound wave is produced from the low mass panel (6) and when a sound wave impinges on the low mass panel (6) an audio-electric signal is produced which is output from the device.