Is MELPe better than the old secure voice standards such as FS1015 LPC-10e (2.4 kbps), FS1016 CELP (4.8 kbps) and CVSD (16 kbps)?
Yes, in 2002 as part of NATO testing for new NATO standard, MELPe was tested against other candidates such as France’s HSX (Harmonic Stochastic eXcitation) and Turkey’s SB-LPC (Split-Band Linear Predictive Coding), as well as the old secure voice standards such as FS1015 LPC-10e (2.4 kbps), FS1016 CELP (4.8 kbps) and CVSD (16 kbps). Subsequently, the MELPe won also the NATO competition, surpassing the quality of all other candidates as well as the quality of all old secure voice standards (CVSD, CELP and LPC-10e). The NATO competition concluded that MELPe substantially improved performance (in terms of speech quality, intelligibility, and noise immunity), while reducing throughput requirements. The NATO testing also included interoperability tests, used over 200 hours of speech data, and was conducted by 3 test laboratories world wide. Figure 1.
