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Digital Signal Processing or DSP is one of the newest technologies
in the hearing aid industry today. It is expected that DSP circuitry
will result in dramatic improvements in sound reproduction for the
hearing impaired by enabling frequency responses to be sculpted
more precisely to each individual hearing loss and individual preferences
for listening as well as adding increased potential for the reduction
of background interference.
The ABC's of Analog and DSP
Almost all hearing aid circuitry today is analogue. Analog circuits
attempt to faithfully replicate a sound wave form using electronics.
In other words the electrical representation of the sound wave is
analogous to the sound input. Technological advancements for analog
circuitry now offer a wide variety of controls to manipulate sound
output.
However, analog circuits still do not offer the precision of a
digital circuit. Digitally programmable hearing aids should not
be confused with true digital hearing aids. This confusion arises
because some of these programmable hearing aids happen to be programmed
on a computer. True digital hearing aids have an Analog-to Digital
(A/D) and a Digital -to-Analog (D/A) convertor in the signal path.
- to further review hearing aid technology and what may be best
for you contact your hearing health care professional.
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