Sennheiser EK3253 - Manual (Page 31)

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Additional information
HDX noise reduction
Progress you can hear:
The 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 90 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. 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 radio
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 transmission would sound
blunt and flat.
RF link
Transmitter Receiver
Inherent
of the
noise
RF link