README.md PATENT NOTICE This source code is provided for educational purposes only. It is a written description of how certain voice encoding/decoding algorythims could be implemented. Executable objects compiled or derived from this package may be covered by one or more patents.

Readers are strongly advised to check for any patent restrictions or licencing requirements before compiling or using this source code. Mbelib 1.3.0 mbelib supports the 7200x4400 bit/s codec used in P25 Phase 1, the 7100x4400 bit/s codec used in ProVoice and the 'Half Rate' 3600x2250 bit/s vocoder used in various radio systems. Example building instructions on Ubuntu: sudo apt-get update sudo apt-get install git make cmake # Update packages git clone # Something like: git@github.com:USERNAME/mbelib.git cd mbelib # Move into source folder mkdir build # Create build directory cd build # Move to build directory cmake. # Create Makefile for current system make # Compiles the library sudo make install # Library is installed into computer.

AMBE3000 DVMEGA AMBE3000 shield fits on top of an Arduino MEGA. Torrent Downloader For Blackberry Playbook there. This board is equiped with a AMBE3000 Vocoder and PCM3500 Codec. Low Income Car Programs Ny. The PCM3500 converts the analog microphone signal into a digital stream ( PCM). And that, conversely, the digital PCM stream is converted back into an analog audio signal. The digital PCM format is 8Khz with a depth of 16 bits.

This would be an amount of data of 128000 bits per second. Not suitable to be sent via a 4800 bps radio connection. The AMBE3000 Vocoder makes of 128000 bps a digital signal of 3600 bps. This is the voice information and error correction codes. These error correction codes make it possible to restore a signal which arrives corrupted at the receiver station up to a certain level.

DVMEGA AMBE3000 can be used as AMBE Dongle (Digital Voice converter) but also as a digital transceiver in combination with the Dual band radio shield or GMSK shield. The DVMEGA AMBE3000 shield will be delivered in conjunction with a LF amplifier / connection board. This board is equipped with a 0.3 watt LF amplifier and connectors for Mike, Speaker and power. Later, this module can be placed on the transceiver mainboard. Block diagram Instructions Step 1, Assemble LF audio board Step 2, Select or make microphone Compatible microphones are MH48 (Yaesu) type.

Step 3, Load the firmware. Download and install. This is a simple program to load the firmware.

The Codec 2 project also contains several modems (FDMDV, COHPSK and mFSK) carefully designed for digital voice over HF radio; GNU Octave simulation code to support. Note that Codec 2 has just one voicing bit, unlike mixed excitation algorithms like AMBE and MELP. FreeDV GUI Program source (development). D-STAR (Digital Smart Technologies for Amateur Radio) is a digital voice and data protocol specification for amateur radio. The system was developed in the late 1990s.

For your ARDUINO: Start Xloader, choose the correct hex file, select Device and set the COM port to the port number that is assigned to the ARDUINO. The baud rate defaults to 115200. Then press Upload to load the firmware.

If the firmware is loaded correctly a message will appear below in the bar of the Xloader screen. Step 4, Install DVMEGA Tool Before you can use the AMBE you have to program your callsign and info text. This data will be stored in Eeprom and has to be done only once. The program is self explained. Download DVMEGA Tool Step 5, Settings G4KLX D-Star repeater software.