Induction-based assistive listening system

Abstract From the Canadian patent

A multiple-loop magnetic induction system for improving communication with the hearing-impaired or to people in general who wish to listen privately to speech or music while being in the company of others or at a public location. The invention uses a particular grid made up of several electrical conductors as a means of generating an audio-frequency magnetic field which in turn couples to the telephone coils already present in most hearing aid units. The audio-frequency magnetic field is correlated to sound waveforms -- speech music, etc. -- which is to be, communicated. The grid configuration is selected so as to produce an end signal which is substantially independent of the location and …