R&S M3SR 4100 Series - Basics of Secure Digital Voice; Figure 4.30 Architecture of the SDV Communication Mode (Principle); Secure Digital Voice

Operating Manual 6175.4760.02 - 01 4.145
M3SR Series 4100 Secure Digital Voice
4.7 Secure Digital Voice
4.7.1 Basics of Secure Digital Voice
The Rohde & Schwarz Secure Digital Voice (SDV) communication mode allows encrypted
voice communication under highly degraded shortwave channel conditions.
Figure 4.30 Architecture of the SDV Communication Mode (Principle)
Figure 4.30 shows the priniciple of the architecture in SDV communication mode. The used
enhanced mixed excitation linear prediction voice encoder (MELPe) enables fair to good
speech quality by converting the human voice into a digital data stream. This data stream is
encrypted by the strong Rohde & Schwarz 256 bit COMSEC algorithm and transmitted by
the internal data modem with an optimized frame structure for SDV communication.
ICN-4G-N-231003-R-D0894-00001-A-01-1
Fixed Frequency
Secure Digital Voice
MELPe
COMSEC
Internal Modem