Control method and unit for loudspeakers in sound system uses inaudible signals from emitter and loudspeaker to trigger visual or audio alert system

摘要

Acoustic signals emission source (22) is linked to amplifier (21) connected to loudspeakers (HP). FSK emitter (3) sends modulated signals, inaudible to man, to amplifier. Inaudible signals sent by loudspeaker attached to FSK emitter are captured by microphone (12) and converted in parallel signals by converting receiver FSK (15). Those signals trigger visual or audio alert to user. An Independent claim is also included for the description of control unit for speakers.