Sennheiser System 2015 Notice D'emploi page 48

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HDX noise reduction system
Transmitter
Progress you can hear:
This product family is equipped with HDX, the Sennheiser noise reduction
system that reduces RF interference. It increases the signal-to-noise ratio in
wireless audio transmission to more than 110 dB.
compander system which compresses the audio signal in the transmitter in a
2:1 ratio (related to dB) to lift it above the inherent 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 radiomicrophone systems.
Note:
Only transmitters and receivers that are equipped with
correctly with each other. If non
dynamic range would be drastically reduced and the transmission would
sound blunt and flat.
off.
RF link
Inherent noise
of the RF link
HDX equipment was mixed with HDX, the
HDX is permanently active and cannot be switched
Receiver
HDX is a wideband
HDX can work