2830A-XX SERIES THREE DIVER
PORTABLE COMMUNICATOR USER MANUAL
283XA-UM
REV 7.0
23
4.5.4
Tender - While diver is speaking, adjust Tender Volume Control to a comfortable
level.
4.5.5
Diver - Depress the push-to-talk switch and while talking into the panel
microphone, adjust diver volume control to a comfortable level for the diver.
4.6
VOLUME CONTROLS FULL DUPLEX (4-WIRE)
4.6.1
The upper row of volume controls set the microphone volume, the lower row of
volume controls set the earphone volume. Tender controls are considered master
controls. The optimum settings are when controls are closely matched, with
differences compensating for differences in diver levels.
Turn unit on and adjust volume controls as follows:
4.6.2
Tender should don headset and talk to himself. If adjustments are required,
increase or decrease Tender volume (controls). This will establish a system volume
level.
4.6.3
Tender (Volume Controls)
•
Earphone – Divers talk, while tender adjusts to a comfortable listening level.
•
Microphone – Tender talks and divers determine a comfortable listening level,
having the tender adjust as needed.
4.7
HELIUM SPEECH UNSCRAMBLER (DSP3) OPERATION
4.7.1
The Helium Unscrambler option is located in the option panel located on right side
of the communicator. A Communicator with this option accommodates a wide
range of operating depths. This state-of-the-art digital design can accommodate a
multitude of functions ranging from the correction of the diver’s raw helium speech
to normal intelligible voice levels, advance treble boost and complex noise
reduction filters (NRF).
4.7.2
The radio can be operated in the air mode by turning the HSU off.
4.7.3
Amron’s advanced NOISE REDUCTION FILTER (NRF) incorporates a complex
DSP algorithm which filters out background noise while allowing the diver’s speech
to be clear and intelligible. Amron NRF automatically captures the frequency
spectrum of applied background noise within the audio frequency bandwidth and
reduces it without affecting the diver’s speech.
4.7.4
The Treble Boost Control provides a means of adjustment to enhance the diver’s
microphone performance. The treble boost feature allows for optimum frequency
enhancement and improved intelligible speech from the diver’s voice.
4.7.5
The Depth Control is used to change the amount of shift in the frequency of the
diver’s voice. The depth control is advanced as the diver’s depth increases. There
is a certain amount of interaction between the controls, and also a difference
between diver voices, therefore it is necessary to tune the unit to the diver.
Intelligibility is the desired result; each operator will find a combination which works
best. The frequency shifting algorithm changes the amount of correction to the raw
Summary of Contents for AMCOM III 2830A Series
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