Research of HF Digital Voice Communication key Technology at Sea

In this paper,introduced key technology of HF digital voice communication at sea,MELP Technology and OFDM Technology.Analysis of the MELP mixed excitation linear prediction speech coding and decoding of the basic working principle,MELP coding of key technologies;Analysis of OFDM technology,its characteristics and the principle and its mathematical analysis.Finally,introduced the HF voice communication system.at sea.with MELP and OFDM techniques.