Open Research Institute / Opulent Voice

Paul KB5MU describes the adventure of understanding and fixing an unexpected failure in the Interleaver test of the C++ implementation of Opulent Voice, the baseline high-quality digital voice mode for the Phase 4 Ground and Space stations, including the Haifuraiya satellite project.

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Paul KB5MU describes the adventure of understanding and fixing an unexpected failure in the Interleaver test of the C++ implementation of Opulent Voice, the baseline high-quality digital voice mode for the Phase 4 Ground and Space stations, including the Haifuraiya satellite project.

Ham Expo presentation from September 2022 by Paul Williamson, KB5MU.

Transmitted voice can never be perfect. Some amateur radio voice modes, especially digital ones, are very much less than perfect. We propose and demonstrate a prototype of Opulent Voice, a higher bit rate digital voice mode that brings voice quality up to a new level.

Measuring deviation limits on the MD-380 to see if it can be used for Opulent Voice.

Open discussion about the uplink and whatever participants want to talk about.

All of Open Research Institute's live demonstrations from DEFCON 30. Exhibit in @RF Hackers Sanctuary

The modifications mentioned at the end of Part 3 to @M17 Project VHF/UHF narrowband have been completed. A 16kbps OPUS codec has been integrated. A variety of other changes to parameterize the codebase for increased utility and flexibility for space and terrestrial microwave band use have been made.

A channel impairment block added to the GNU Radio flow-graph. This is an over-the-air demonstration of a transmitter and receiver for Opulent Voice at 905 MHz, with the baseline16kbps OPUS codec integrated.

Flow-graphs and information about the simulators can be found here: https://github.com/phase4ground/documents/tree/master/Engineering/Uplink%20Modem/Simulator

More information about Opulent Voice can be found here:
https://www.openresearch.institute/2022/07/30/opulent-voice-digital-voice-and-data-protocol-update/

Thank you to all who support the work.