D-STAR is capable of connecting repeater sites using the web to form a world-wide radio network. Voice is converted to a digital format using a bit of computer code referred to as a CODEC. The CODEC code is embedded on a microchip which encodes and decodes the audio signals into and out of the AMBE (Advanced Multi-Band Excitation format). The CODEC that D-STAR uses is the only proprietary portion of D-STAR. All other parts of D-STAR are open which has allowed enthusiasts to develop this part of the hobby.
(*Digital Smart Technology for Amateur Radio)