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HDX noise reduction
HDX noise reduction
Progress you can hear.
This product family is equipped with HDX, the Sennheiser noise
reduction system that reduces RF interference. It increases the sig-
nal-to-noise ratio in wireless audio transmission to more than
110 dB.
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 inherent noise floor of the RF link. A 110 dB dynamic range sig-
nal 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 HDX can
work correctly with each other. If non HDX equipment was mixed
with HDX, the dynamic range would be drastically reduced and
the transmission would sound blunt and flat or shrill.
RF link
Transmitter
Receiver
Inherent
noise
of the
RF link