Sennheiser SK 50 - 04-05 Specifications download pdf (Page 52)

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

signal-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

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 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

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Sennheiser SK 50 - 04-05 Specifications Page 52