MELPe (STANAG-4591) Software

MELPe codec is a US DoD and NATO secure voice codec known as STANAG-4591 (also MIL-STD-3005). The MELPe codec software is available on various ARM, Android, iOS, Windows, DSPs by Texas Instruments such as TMS320c54xx, TMS320c55xx, TMS320c64xx C64x+ (such as C674x C672x etc.), and OMAP (c55x based, c64x+ based (L137, L138) etc..), Analog Devices BlackFin ADSP-BF561 and TigerSharc (TS101, TS20x, etc.), GHS and PowerPC.

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MELPe (STANAG-4591) Hardware

Compandent offers low-cost Data-Terminal Equipment (DTE) for interfacing vocoders (such as MELPe) with external Data Communication Equipment (DCE) such as modems or crypto devices. It is based on Compandent created testbed device (MELCODER a.k.a. the NATO “gold standard” reference hardware for STANAG-4591) utilized by the NATO's test-laboratory as a part of the MELPe standard adoption process.

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MELPe (STANAG-4591) FAQ

Useful MELPe Frequently Asked Questions (FAQ) were gathered and compiled for your benefit and education, and are  available at the link below.

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MELPe - Enhanced Mixed-Excitation Linear Predictive Vocoder

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. Compandent's MELPe vocoder software 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 / c64x+ MELPe Package Fact Sheet, as well as Windows, Linux, ARM, Android, iOS, Analog Devices BlackFin ADSP-BF561 and TigerSharc (TS101, TS20x, etc.), ARM, GHS PowerPC, and Android & iOS 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. It is based on Compandent created testbed device (MELCODER a.k.a. the NATO “gold standard” reference hardware for STANAG-4591) utilized by the NATO's test-laboratory as a part of the MELPe standard adoption process.

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 MELPe software under Android was used and tested by NATO also as part of the development of Secure Communications Interoperability Protocols (SCIP).

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To find out more about MELPe

For more information about MELPe vocoder, history, standards, applications, and implementations.

Note To Defense Contractor Management and Engineering

This note in intended for Defense Contractor Management and Engineering who intend to productize MELP or MELPe vocoder (voice coder).  To learn more about Compandent's MELPe software suites and hardware...