to the Neon end-user brochure

Models In The
Neon Range
Neon
Hearing Systems
Why Digital?
Hearing Systems
The previous generation of hearing
aids utilised amplification systems
based on analogue electronic technology. These hearing aids
simply took the sounds and noises that they "heard" and
amplified them. That meant amplifying unwanted signals also.
It was possible to apply some limiting factors to the output
sound levels of these hearing aids but in general, although
they were an excellent solution for the patients, the opportunity
to use Digital Signal Processing was a huge breakthrough.
Neon VC
Behind-The-Ear Hearing System
13
3.6g
12x8x36mm
Neon PP
Behind-The-Ear Hearing System
Digital Signal Processing allows us, the manufacturer, to do just
that:- "process" the signals that are received by the hearing aid.
This means that we can manipulate the incoming sound, and
transform it into what the user feels most comfortable with. We
can reduce unwanted noise, and concentrate on providing the
user with clearer speech signals.
675
6.6g
14x8x46mm
Neon SM-VC
In-The-Canal Hearing System
Available from:
10A/312
2.5g*
10x6x18mm*
Neon CIC
Completely-In-The-Canal Ear Hearing System
10A
2.0g*
8x6x15mm*
*nominal
www.dac.puretone.net
Puretone Ltd, 9-10 Henley Business Park, Rochester, Kent. ME2 4FR. England.
t: +44 (0)1634 719427 f: +44 (0)1634 719450
e: info@puretone.net w: www.puretone.net
DAC
Digital
Audio
Chemistry
Welcome to DAC
from Puretone
DAC
Features of Neon
Hearing Systems
Digital
Audio
Chemistry
The Puretone
DAC (Digital Audio Chemistry) range has been
specifically designed for a multitude of hearing losses and user
applications to suit all environments. Its specialised circuitry
Neon
Hearing Systems
100% Digital Signal Processing (DSP)
2 DSP channels
9 frequency band tuning
and processor ensure crystal clear sound in all situations.
Speech is amplified while excess background noise
picked up by the microphone is reduced.
Speech Management System
Speech Management System
Adjustable compression ratio
The Speech Management System digitally manages environmental
sound in order to, for example, increase the clarity of speech in a
noisy environment such as a party. It will suppress distorting noise
and works independently in each of the AGCi channels.
Adjustable threshold kneepoint
AGCi: Input Controlled Automatic Gain Control
Microphone Noise Reduction
Neon - 2-Channel, 9-Band Hearing Systems
2 channels with more gain for quiet sounds and less gain for
loud sounds. Feedback manager, Speech Management
System (SMS) and Microphone Noise Reduction (MNR) make
these sophisticated instruments extremely versatile and suitable
for most users’ personal preference.
Independent adjustment for soft and loud sounds
Manual volume control option
Feedback management
2.8 MHz processor speed
Feedback Manager
Feedback (whistling) is caused by amplified sound being fed
30-bit resolution
back into the hearing aid receiver, being amplified again, and
being fed back in again. This phenomenon normally happens
Electronic noise from the hearing system is
cancelled out by the MNR circuitry.
Microphone Noise Reduction
at the resonant frequency of the auditory canal (about 3 KHz.)
The feedback manager dampens this frequency (and
frequencies adjacent to it) to prevent feedback occurring.
In cases where the patient has a mild hearing loss, it is possible
that they will be able to hear the actual circuit noise generated in
the hearing aid in a quiet environment. MNR circuitry cancels out
this noise and provides the user with a quiet hearing aid.