Amron AMCOM III 2830A Series, Руководство пользователя

Страница: 16 / 54

2830A-XX SERIES THREE DIVER
PORTABLE COMMUNICATOR USER MANUAL
283XA-UM REV 7.0
12
3.3 HELIUM SPEECH UNSCRAMBLER (DSP3) CONTROLS
The controls for the DSP3 Helium Speech Unscrambler (HSU) are located in the options
panel on the right side of the front panel as shown below.
3.3.1 ON/OFF SWITCH – Allows the selection of air (OFF) or helium (ON) operation. In
the OFF position, the divers’ microphone signal bypasses the HSU. In the ON
position, the microphone signals are routed to the HSU and the tender can adjust
the controls as necessary.
3.3.2 TREBLE BOOST – Selects the amount of gain added to the High Frequency (HF)
portion of the divers’ microphone signals. This compensates for the HF drop-off in
the sensitivity of most microphones. The TREBLE BOOST feature allows for
optimum frequency enhancement and improved intelligible speech from the diver’s
voice.
3.3.3 DEPTH CONTROL – Selects the amount of frequency correction performed by the
HSU to produce intelligible speech. This control uses a multi-turn potentiometer
and is equipped with a turn counting knob and lock. Once the desired setting is
reached, the lock can be used to prevent accidental changes to this control.
3.3.4 NOISE REDUCTION FILTER – The Noise Reduction Filter (NRF) uses a complex
Digital Signal Processor algorithm based on a statistical-model of human voice
activity to capture the background noise and reduce it without affecting the divers’
speech. The noise level can be reduced by up to 17 dB.