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Valuable information on NoiseGardTM/digital
S1 DIGITAL | 31
Valuable information on NoiseGard
TM
/digital
Combination of two NoiseGard strategies
Active noise compensation (ANR, NoiseGard) is based on the principle of cancel-
ling out unwanted sound using “anti-sound” (phase-inverted sound). There are
two distinct strategies: the feedback (FB) strategy and the feedforward (FF)
strategy .
Operating principle of the two ANR strategies
Feedback (FB) ANR uses microphones integrated inside the ear cups to pick up
the sound signal near the ear. This sound signal is processed by a FB control circuit
that calculates the required “anti-sound” and outputs it via the loudspeaker. This
is the “classic” NoiseGard strategy used in most headsets with analog NoiseGard
technology. FB-NoiseGard works especially well in the low-frequency range.
Feedforward (FF) ANR, on the other hand, uses microphones mounted on the
outside of the ear cups to directly pick up the unwanted noise. The FF control
circuit then calculates the required “anti-sound” and outputs it via the loud-
speaker. The FF control circuit cannot become unstable at higher frequencies, and
therefore allows for a strikingly increased NoiseGard performance in the upper
frequency range.
NoiseGard
TM
/digital uses both ANR strategies. Each ear cup features its own inner
and outer microphones and a loudspeaker, allowing the advantages of both the
FB and FF strategies to be combined. As a result, the NoiseGard performance is
outstanding both in terms of the amount of noise attenuation and the wide
range of frequencies over which it is effective.
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