[1] A young designer, Jeff Childress, created an autonomous radio base-station controller, known as the GETC (General Electric Trunking Card).
Childress and the team demonstrated that a smart controller could be adapted to a variety of applications, but his interest was really in fault tolerance.
This provided substantial hardware reductions, and the required software efforts yielded a variety of unique features and options.
AEGIS was the second generation EDACS digital voice mode, made once again by GE, with Adaptive Multiband Encoding as its coding scheme.
The technical difference between ProVoice and the APCO Project-25 standard is how error correction and modulation is provided to transmit the data.