Sennheiser 2015 User Manual download pdf (Page 47)

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

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Sennheiser 2015 User Manual Page 47