M3SR Series 4100 Secure Digital Voice
4.146 Operating Manual 6175.4760.02 – 0
1
The S
DV communication mode was thoroughly designed to match nowadays user require-
ments as:
• Fair to Good Speech Quality
There are two possible vocoder modes (MELP2400 and MELP600) allowing fair to good
speech quality. The operator benefits from the possibility to choose the speech quality
according to actual channel conditions.
• Very Robust Real-time Voice Communication
Optimized data modem algorithms allow communication even in highly degraded HF
channels. The required cryptographic synchronization data for the COMSEC algorithm
is transmitted in a very robust manner. Therefore the risk of a false crypto synchroniza-
tion, often seen in legacy systems, is almost eliminated.
• Low Voice Delay
A sophisticated modem frame structure optimized for voice communication, together
with the built-in COMSEC mechanism, enables SDV to achieve unrivalled low voice de-
lays in the HF sector.
• Very Strong COMSEC Algorithm
SDV is secured by the very strong Rohde & Schwarz 256 bit build-in COMSEC algorithm
to protect information against interception.
• Automode Capability
It is not needed to know beforehand the current vocoder mode settings of the communi-
cation counterpart because it is self-identified during the transmission. The receiver au-
tomatically detects the mode and processes the voice data accordingly. The operator
benefits from less interaction.
• Fast Late Entry Capability
In cases where the beginning of the voice transmission was missed, e.g. due to wrong
frequency or very poor channel conditions, the SDV communication mode is able to syn-
chronize even to an ongoing transmission. Here again the optimized data modem frame
structure allows a fast modem and crypto synchronization.
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