Channel plugins with special conditions

DSD (Digital Speech Decoder)

This is the demoddsd plugin. At present it can be used to decode the following digital speech formats:

• DMR/MOTOTRBO
• dPMR
• D-Star
• Yaesu System Fusion (YSF)
• NXDN

It is based on the DSDcc C++ library which is a rewrite of the original DSD program. So you will need to have DSDcc installed in your system. Please follow instructions in DSDcc readme to build and install DSDcc.

Note that you will need to compile with SerialDV support. This makes possible to use AMBE serial dongles or AMBE server connections. Please refer to this project Readme.md to compile and install SerialDV. Note that your user must be a member of group dialout (Ubuntu/Debian) or uucp (Arch) to be able to use the dongle.

Although such serial devices work with a serial interface at 400 kb in practice maybe for other reasons they are capable of handling only one conversation at a time. The software will allocate the device dynamically to a conversation with an inactivity timeout of 1 second so that conversations do not get interrupted constantly making the audio output too choppy. In practice you will have to have as many devices connected to your system as the number of conversations you would like to be handled in parallel.

When no AMBE devices or servers are activated mbelib is used to decode AMBE frames but mbelib comes with some copyright issues.

While DSDcc is intended to be patent-free, mbelib that it uses describes functions that may be covered by one or more U.S. patents owned by DVSI Inc. The source code itself should not be infringing as it merely describes possible methods of implementation. Compiling or using mbelib may infringe on patents rights in your jurisdiction and/or require licensing. It is unknown if DVSI will sell licenses for software that uses mbelib.

Possible copyright issues apart the audio quality with the DVSI AMBE chip is much better.