Category:MELP

MELP / MELPe - Enhanced Mixed-Excitation Linear Predictive Vocoder

MELP / MELPe- Enhanced Mixed-Excitation Linear Predictive (MELP) vocoder, known as military standard MIL-STD-3005 and NATO STANAG 4591, is a triple-rate low rate coder that operates at 2400, 1200 and 600 bps. The Compandent's MELPe vocoder suite (a.k.a MELPe++ or MELPe-Plus-Plus) includes also compressed bit-stream transcoding between the rates as well as optional Noise Pre-Processor. MELPe's performance is demonstrated in Tables 1-3 below, and c54xx & c55xx MELPe Package Fact Sheet & c64xx MELPe Package Fact Sheet are also available. See also Compandent MELPe FAQ. Compandent offers low-cost Data-Terminal Equipment (DTE) such as FLEXI-232 and FLEXI-PC104 for interfacing vocoders such as MELPe with external devices such as modems.

Compandent Inc. has participated in the research, development and implementation of the Enhanced Mixed-Excitation Linear Predictive (MELPe) vocoder, and utilized its savvy expertise in speech coding and DSP to take the MELPe to the next level, the Compandent MELPe suite. In addition, Compandent provides various software and hardware related to the MELPe vocoder.

Compandent's MELPe is better than the standard reference!

Compandent's MELPe (MELPe-Plus-Plus) produces better quality than the standard reference! Compandent has been supporting and improving the MELPe real-time implementation, and has found and fixed numerous bugs in it, many of these bugs could not be discovered by simply processing the standard Test Vectors, rather than by comprehensive process of analyzing and optimizing the code and testing it under wide variety of scenarios and conditions conducted by Compandent's speech coding and DSP experts. We can show you examples where the standard reference produces hoarse speech or annoying clicks while Compandent's MELPe (MELPe++) produces much better sounding and cleaner speech. Therefore Compandent's MELPe (MELPe++) is in fact better than the standard reference! Compandent has also greatly improved and optimized the code. Compandent has ported MELPe to various DSPs by Texas Instruments such as TMS320c54xx, TMS320c55xx, TMS320c64xx, and OMAP.