2830R THREE DIVER COMMUNICATOR USER MANUAL
2830R-UM
REV 5.0
22
5.7.5
Speaker On/Off Switch
For normal operation the speaker switch is left on. When operating in noisy
conditions, it may be advantageous to use a headset to cut out the background
noise. In this case it will be desirable to shut off the speaker. There are other
conditions when turning off the speaker is desirable, situations where the nature of
the work requires a confidential handling of communications.
5.7.6
Record Jack (Rear Panel)
Isolated audio output to drive a recorder. Use standard RCA type audio cable to
connect the diver radio to the audio recorder. Test record audio, checking both
tender to diver conversation and diver to tender conversation for proper record
levels.
5.8
Options
5.8.1
Helium Speech Unscrambler Option /26DSP3
The Helium Unscrambler option is installed into 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 ra
nging from the correction of the diver’s raw helium speech
to normal intelligible voice levels, advance treble boost and complex noise
reduction filters (NRF)
Diver radios configured with this option are only supplied with the AC power option.
This is due to the power requirements of the Unscrambler option. The radio can be
operated in the air mode by turning the HSU off.
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
’s
NRF automatically captures the frequency
spectrum of applied background noise within the audio frequency bandwidth and
reduces it without affecting the diver’s speech.
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.
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
helium speech. The Depth Control is a multi-turn control with a locking feature. This
allows the tender to finely adjust the level necessary and lock the control to prevent
accidental adjustments.
