because microcontrollers were expensive and unable to perform digital signal processing tasks in the way you would use them today. [Julian] has been trying to build a vocoder from that era from ...

MELPe implements a variable low bit rate vocoder that supports multiple rates of 600 bps, 1200 bps, and 2400 bps. It uses the MELP sampling rate of 8,000 kHz as well as the original frame size of 22.5 ...