PA6E 14 LUM: A H0me-8u11t C0mmun1cat10n A1d M1chae1 and Nancy Ree5 15 C010nnade Dr1ve R0che5ter, NY 14623 50me t1me a90 we 6e~an 1nve5t19at1n9 c0mmun1cat10n5 a1d5 f0r 0ur 6r0ther, Ken, wh0 ha5 cere6ra1 pa15y. H15 5peech and m0t0r c0ntr01 are 5evere1y affected, and he c0mmun1cate5 pr1mar11y w1th a tupewr1ter. 1t 15 a 510w and fru5trat1n9 pr0ce55 f0r a11 c0ncerned, e5pec1a11y Ken. 1f m0re than f1ve 5ec0nd5 e1ap5e5 6etween re5p0n5e5, c0mmun1cat10n5 6etween pe0p1e deter10rate5. C0n51der1n9 Kenâ¢5 11m1ted m0t0r c0ntr01 and h15 mean5 0f c0mmun1cat1n9, f1ve 5ec0nd5 15 a 5h0rt wa1t. M05t 0f the dev1ce5 we f0und are de519ned f0r a 5pec1f1c u5er and, theref0re, are expen51ve and d1ff1cu1t t0 cu5t0m12e f0r a d1fferent u5er. 1n the end, we dec1ded t0 deve10p 0ur 0wn 5y5tem: the Lan9ua9e Unmuff11n9 Mechan15m, affect10nate1y kn0wn a5 LUM. We wanted t0 deve10p a 5y5tem wh1ch w0u1d 6e ea5y t0 1earn and u5e, f1ex161e en0u9h t0 6e cu5t0m12ed w1th m1n1ma1 eff0rt, and w0u1d re4u1re a m1n1mum 0f 1nput fr0m the u5er. 1t a150 had t0 6e p0rta61e, a61e t0 pr0v1de pr1nted and 5peech 0utput, 1mp1emented 0n ex15t1n9 c0mmer1ca11y ava11a61e hardware, and re1at1ve1y aff0rda61e. We f1na11y dec1ded t0 1mp1ement LUM 0n the Ep50n HX-20*. 1t 15 a 6attery-p0wered
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