Valuable information on NoiseGard
TM
/digital
26 |
S1 DIGITAL
lation is done by a fully-adaptive algorithm, for which a high-performance
signal processor is used. This fully-adaptive algorithm is the core of the
NoiseGard
TM
/digital technology and ensures that the currently dominant
sound components are particularly well attenuated. The attenuation curve
resulting from the adaptation is therefore always optimal for the current
situation.
The sound components that are dominant in the ear not only depend on
the noise of the aircraft but also on the user’s position in the cockpit and,
above all, on how the sound is transmitted through the headphones to the
ear. This, in turn, depends on the fit of the headphones, on whether or not
glasses are worn and on the head and ear anatomy.
Compared to other adaptive technologies available on the market, the par-
ticular strength of the fully-adaptive FF-NoiseGard is its ability to cancel
broadband noise and not only individual tonal components. Cockpit noise
consists of broadband noise components and individual tonal components
(e.g. the fundamentals and harmonics of propeller rotation). If only the
tonal components are canceled, the broadband noise remains unaffected
and no significant noise reduction can be achieved in practice. Due to its
full adaptivity, the NoiseGard
TM
/digital technology allows to simulta-
neously cancel both broadband and tonal sound components, thus always
leading to an excellent performance.
Overall noise compensation (principle)
The attenuation curves of the passive attenuation and of the digital FB-
ANR are fixed, whereas the attenuation of the digital adaptive FF-ANR
depends on the situation. This reveals the powerful effect of adaptivity,
which always provides the greatest attenuation where the loudest noise
components manifest themselves.
0,1
0
-5
-10
-15
-20
-25
-30
-35
kHz
dB
Noise Attenuation
1
10
Dig. FB
Dig. Adaptive FF
Passive
Summary of Contents for S1 NOISEGARD
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