2 Digital sound processing technology by Clarity (acronym) (3) 3 Acronym for teletypewriter (i.e. phone for the deaf) (3) 4 Triangle-shaped hearing aids by Oticon. (5) 6 Major supplier of assistive listening products (9) 7 A type of degeneration of the eyesight (7)
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1 A unit of measurement of the refractive power of lenses (7) 2 A unit used to express relative difference in power or intensity, usually between two acoustic signals (7) 5 A popular brand of TV listening device (6)