induction loop
noun/ɪnˈdʌkʃn luːp/
/ɪnˈdʌkʃn luːp/
(also hearing loop)
- a system in theatres, etc., that helps people who cannot hear well. A ring of wire around the room produces a signal that can be received directly by hearing aids.
（剧院等的）感应环路助听系统