Sennheiser LV307, LV308 manual HDX noise reduction, Progress you can hear, Inherent

HDX noise reduction

HDX noise reduction

Progress you can hear.

RF link

Inherent

noise

of the

RF link

Transmitter Receiver

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.

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