4 of 33
xDR-DSP
– Diver Intercom Manual
Build 39 Date: 30-08-2021
Abbreviations
Ah
Ampere per hour
Vdc
Volt DC
Vac
Volt AC
Vpp
Volt peak to peak
DSP
Digital signal processing
PTT
Push to Talk
2-wire (simplex)
Two wire used for communication. The Microphone and earphones of the diver share
the two wires in the umbilical.
4-wire (duplex)
Four wires used for communications. Two wires are used for the microphone and two
wires are used for the earphones.
Mic
Microphone (Diver, panel or headphone/set)
Head
Earphone (diver or headphone/set)
HS
Headset
WHS
Wireless Headset
H
Wireless Headset
D
Diver
T
Tender (operator/supervisor)
HD
Half Duplex (Diver is always heard, Tender needs to press PTT to talk to the diver)
FD
Full Duplex (Full open communication between divers and divers-Tenders)
Vol.
Volume (gain)
Int.
Internal
Ext.
External
SPK
Speaker
Aux
Auxiliary audio input or output
Rec
Output to recorder or Audio output
CW
Clock-wise
CCW
Counter clock-wise
FFM
Full Face Mask
