Sennheiser EM 3732 Additional information, HiDyn plus HDP noise reduction, Squelch, Transmitter

Additional information

Additional information

HiDyn plus™ (HDP) noise reduction

RF link

Inherent

noise

of the RF link

Transmitter Receiver

The EM 3731/3732 receivers are equipped with HDP, 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. HDP 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.

HDP has been specially developed for high quality radiomicrophone systems.

The EM3731/3732 receivers feature a AES3 digital audio output for digital mixing consoles. In the receiver the audio signal is digitalized as early as possible so that the noise reduction (compander) can be realized digitally.

Note:

Only transmitters and receivers that are equipped with HDP can work correctly with each other. If non HDP equipment was mixed with HDP, the dynamic range would be drastically reduced and the transmission would sound blunt and flat. HDP is permanently active and cannot be switched off.

Squelch

Depending on the strength of the received RF signal, the receiver’s audio output is opened or muted. Via the “Squelch” menu, the squelch threshold can be adjusted in 15 steps from 0 to 30 μV.

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