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FM systems
Radio frequency (FM) systems are a supplement to hearing aids (hearing aid, cochlear implant) for understanding in acoustically difficult listening situations (in noise or at a distance).
The speaking person wears a transmitter microphone around his neck, holds it in his hand or places it in the middle of a group where it picks up speech from all directions. The wireless, digital transmission of the transmitter transmits the speech signal to the receivers of the hearing instruments.