Electrical audio signal processing systems and devices – One-way audio signal program distribution – Near field
Patent
1989-05-09
1990-03-13
Isen, Forester W.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Near field
455 41, 375 55, H04B 500
Patent
active
049088696
ABSTRACT:
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 the orientation of the hearing aid device within the area of the grid and which falls off precipitously outside of the region defined by the grid. The conductors which make up the grid configuration are enveloped in a flexible, lightweight matting which can be unrolled in the area to be addressed.
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Bosman et al., A New Approach to a Space-Confined Magnetic Loop Induction System, IEEE Transactions on Audio, vol. A0-13, No. 3, May/Jun. 1965.
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Gagnon, "Yarmouth Man Markets Loop for Better Hearing", MaineSay, Wednesday, Jan. 25, 1989, p. 19.
Bohan Thomas L.
Isen Forester W.
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