Sennheiser EW 300 G2 User Manual download pdf (Page 83)

Additional information

HDX noise reduction

Progress you can hear:

The evolution wireless G2 series 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. HDX is permanently active and cannot be switched off.

Wireless transmission systems

With the ew 300 G2 series, Sennheiser puts an end to cable tangles and

enables complete freedom of movement. The systems operate exclusively in

the UHF band. UHF transmission is extremely reliable and is far less prone to

interference than the overcrowded VHF band – harmonics from mains units,

fluorescent tubes, refrigerators, computers, etc. are virtually eliminated. Also

indoor propagation of UHF radio waves is better than VHF so that the RF

power can be kept low – this is also an advantage when using multi-channel

systems. Finally, UHF frequency ranges are being approved all over the world

for radiomicrophone usage – in some countries licence-free.

There are two transmitter versions: The hand-held transmitter is a complete

radiomicrophone in a single unit, the bodypack transmitter can accept a wide

range of inputs including: omni-directional or cardioid clip-on microphones,

head-worn microphone, guitar/instrument direct input and auxiliary units

via the optional CL 2 line input cable.

Correct adjustment of transmitter sensitivity is vital. Too high and you get

overmodulation and distortion, too low and you get undermodulation and a

RF link

Transmitter

Inherent noise

of the RF link

Receive

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Sennheiser EW 300 G2 User Manual Page 83