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CD 443 Final Exam: Questions & Well Detailed Answers
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CD 443 Final Exam: Questions & Well Detailed Answers
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CD 443 Final Exam: Questions & Well Detailed AnswersHearing aids Right Ans - mini amplifiers. capture incoming sound, increase
intensity, deliver it to ear.
Types of hearing aids Right Ans - - body worn
- behind the ear (BTE)
- in the ear (ITE)
- in the canal (ITC)
- completely in the canal (CIC)
- bone conduction hearing aids
- open fit BTE
modern hearing aids Right Ans - less focus on miniaturization, more focus
on improving performance
improve speech perception in noise Right Ans - holy grail of hearing aids
- changes in signal processing technology
- changes in microphone technology
open-fit Right Ans - newest hearing aid technology.
fitted to ear with narrow tube.
digital feedback cancellation.
good for high freq hearing losses.
type of BTE.
have led to large increase in BTE sales.
- occlusion effect does not happen with this hearing aid
how hearing aids work Right Ans - 1. sound pick up by microphone
(converts acoustic signal to electric);
2. signal amplified and/or processed;
3. receiver converts electrical signal back to acoustic (in BTE, sound delivered
to ear canal by earmold)
a microphone converts an acoustic signal to an electrical signal. T/F? Right
Ans - TRUE
, a receiver converts an electrical signal into an acoustic signal. T/F? Right
Ans - TRUE
analog, digital, hybrid Right Ans - 3 types of processors or circuits
analog Right Ans - - sound is processed as a continuous electrical signal
(generated by mic).
- signal modified by electronic components.
- hearing aid characteristics are adjusted by screw settings.
digital Right Ans - - electric signal from mic is converted to 1's and 0's.
- computer chips carry out the various signal modifications. (connected to
computer)
- characteristics are programmed using specialized software.
- can store multiple sets of characteristics. debuted in 1998.
hybrid Right Ans - - sound remains in analog form.
- electronic signals modify signal.
- hearing aid settings are controlled using computer software and stored in
hearing aid digitally.
- can have multiple settings stored. debuted 1990.
hearing aid characteristics Right Ans - gain -> how much amplification are
you going to provide the individual
frequency response,
input/output function -> if you put in a signal that is 30 dB how loud are you
going to make that signal on the other side of the hearing aid
hearing aid components Right Ans - microphone,
amplifier,
receiver.
volume control wheel,
battery,
telecoil -> useful for talking on the telephone or in theaters where there is a
loop
multiple memories Right Ans - for hearing aids. can have different internal
settings for different listening environments.
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