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BOSE Hearing Aids and Hearing Assist Technology
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[QUOTE="jedishrfu, post: 6182428, member: 376845"] As a secondary comment, my students did a summer project last year where we constructed a similar device although not as polished. Basically, we used two USB lapel mics with -40db sensitivity connected to a Raspberry-PI along with headphones for listening. The idea was that the PI would perform rudimentary beamforming ie add the left and right signals to emphasize person to person hearing assist. We thought they could be used by an auditorium speaker trying to hear the question of a student at 60 ft away. Human speech is 70db when 1 foot away from the speaker and drops 6db for each doubling of the distance. [code] 1 ft = 70db 2 ft = 64db 4 ft = 58db 8 ft = 52db 16 ft = 46db 32 ft = 40db 64 ft = 34db [/code] The few takeaways we learned: 1) Don't buy cheap lapel mics (our USB lapel mics both had the same fixed USB address) 2) Don't buy cheap mics period (the sensitivity varied between them and they need to be balanced) 3) The raspberry-pi introduced a noticeable delay of 1/10 sec or so that sounded a bit like an echo 4) The mics should be placed near each ear using the head for separation of the soundspace Our device looked like a Texas longhorn steer headset with the horn tips for the mics made of structured foam plastic attached to the headphones. Wearing them made you look like a reject from the Mickey Mouse club or a cheerleader at a football game. However, it was a fun project and the students learned a lot. [/QUOTE]
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