In battlefield, messages must be encrypted to provide protection from enemy interception. Several speech coding algorithms have been developed to provide secure communications. FS1015 LPC in 1984, FS1016 CELP in 1991and FS MELP in 1997 became official federal standards. In 2002, the US DoD adopted enhanced MELP (MELPe). Later on in 2007, US Naval Research Laboratories have designed Variable Dat...