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Mixed Excitation Linear Predictive (MELP) Vocoders

Mixed-excitation linear prediction (MELPe) is a United States Department of Defense (US DoD) speech coding standard used mainly in military applications and satellite communications, secure voice, and secure radio devices. Its standardization and later development was led and supported by NSA, and NATO, also known as STANAG-4591.

The NATO competition concluded that MELPe substantially improved performance (in terms of speech quality, intelligibility, and noise immunity), while reducing throughput requirements. The low-cost FLEXI-232 Data Terminal Equipment (DTE) made by Compandent, which are based on the MELCODER golden reference, are very popular and widely used for evaluating and testing MELPe in real-time, various channels & networks, and field conditions. "A Mixed Excitation LPC Vocoder Model for Low Bit Rate Speech Coding," Alan V. McCree, Thomas P. Barnweell, 1995 in IEEE Trans.

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