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HDX noise reduction system
You can hear the difference:
This product is equipped with
HDX
, the Sennheiser noise reduction system that reduces RF interference. It
increases the signal-to-noise ratio in wireless audio transmission.
HDX
is a wideband compander system
which compresses the audio signal in the transmitter in a 2:1 ratio (related to dB) to lift it above the inher-
ent noise floor of the RF link. A 110 dB dynamic range signal is thus transmitted with an effective dynamic
range of only 55 dB, which is above the 60 dB noise floor of the RF link. In the receiver the signal is expanded
in an identical and opposite way in a 1:2 ratio to restore the original signal, at the same time reducing the
RF noise to below the noise floor of the receiver.
HDX
has been specially developed for high quality RF microphone systems.
Note:
Only transmitters and receivers that are equipped with
HDX
can work correctly with each other. If non
HDX
equipment was mixed with
HDX
, the dynamic range would be drastically reduced and the trans-
mission would sound blunt and flat.
HDX
is permanently active and cannot be switched off.
RF link
Transmitter
Receiver
Inherent
of the
noise
RF link
47


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