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A hybrid vocoder that uses both DVSI hardware and Codec2 open source software.
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Doug McLain 6693aad073
Fix tcd crash on M17 TX 		4 years ago
codec2 added codec2 from mvoice 4 years ago
systemd uninstall ftdi_sio and usbserial 4 years ago
.gitignore it compiles! 4 years ago
Controller.cpp Fix tcd crash on M17 TX 4 years ago
Controller.h Use md380_vocoder for ambe+2 codec 4 years ago
DV3000.cpp Fix gain adjust and remove debug output 4 years ago
DV3000.h Add gain adjust values 4 years ago
DV3003.cpp Add gain adjust values 4 years ago
DV3003.h Add gain adjust values 4 years ago
DVSIDevice.cpp Use md380_vocoder for ambe+2 codec 4 years ago
DVSIDevice.h Use md380_vocoder for ambe+2 codec 4 years ago
DVSIPacket.h support for dvsi 300{0,3} 4 years ago
LICENSE Initial commit 4 years ago
Main.cpp make sure we don't send the back a packet twice 4 years ago
Makefile Use md380_vocoder for ambe+2 codec 4 years ago
PacketQueue.h a blocking CPacketQueue 4 years ago
README.md Update README 4 years ago
TCPacketDef.h mend 4 years ago
Timer.h several improvements to CTranscoderPacket 4 years ago
TranscoderPacket.cpp only return packet once 4 years ago
TranscoderPacket.h only return packet once 4 years ago
UnixDgramSocket.cpp mend 4 years ago
UnixDgramSocket.h mend 4 years ago
WinTypes.h switched to ftd2xx 4 years ago
ftd2xx.h switched to ftd2xx 4 years ago

README.md

tcd

tcd is a hybrid digital voice transcoder for ham radio used by the new URF reflector.

Introduction

This will build a new kind of hybrid transcoder that uses AMBE DVSI-based hardware for vocoding digital voice streams used in DStar/DMR/YSF and David Rowe's open-source Codec2 used in M17. TCd is optimized for performance by using a highly multi-threaded design that incorporates blocking I/O to make it as efficient as possible.

This is the only transcoder that will work with the URF reflector.

This software is loosely based on LX3JL's ambed, but is easily different enough to be considered an entirely original work. Here are some major differences with ambed:

  • tcd uses both hardware-based and software-based vocoders, providing a bridge between the closed source vocoders used in DStar, DMR and YSF and open-source vocoders used in M17.
  • UNIX Sockets are used to communicate between the reflector and this transcoder. This greatly simplifies the code and significantly improves transcoding performance.
  • AMBE vocoders are dedicated to an assigned reflector channel. This prevents overloading when processing multiple voice streams and provides the best possible performance for the reflector's clients.

Constraints and Requirements

This branch uses only one 300x device for the AMBE+(DStar) codec. The md380_vocoder library is used for the AMBE+2 (DMR/YSF/NXDN) codec. This means that this branch of tcd must run on an ARM platform like a RPi.

Currently, this program must be run locally with its paired URF reflector. Remote transcoding is not yet supported.

Only systemd-based operating systems are supported. Debian or Ubuntu is recommended. If you want to install this on a non-systemd based OS, you are on your own. Also, by default, tcd is built without gdb support.

Download the repository

In the parent directory of you urfd repository:

git clone https://github.com/n7tae/tcd.git

To be perfectly clear, the urfd reflector repository clone and this clone must be in the same directory.

Configuring, compiling, installing and other activities

All other activities will be performed by the ./rconfig and ./radmin scripts in your urfd repo.

73

DE N7TAE

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