V.A. Aladinskiy - Ph.D. (Eng.), Professor, Leading Research Scientist, LTD «Special Technological Center» (St. Petersburg). E-mail: awa2810@ya.ru S.V. Kuzminskiy - Adjunct, Military Academy of Signal Communication (St. Petersburg). E-mail: olga497@bk.ru

When sending phone messages on foreign radio communications range of high frequency using digital radio signals are widely used vo-coders linear prediction. A number of parameters of digital streams generated by modern foreign vocoder linear prediction, fixed and specified in the design phase. Parameters of digital streams, asked at the stage of verbal communication are variable. The structure of one digital stream block of the selected types of vocoders include elements for transmitting information about the para-meters of the primary electric signal, and providing synchronization and increase noise immunity of the transmitted information. The ma-thematical description of structure of one digital stream block can be represented as the sum of the elements included in it. The syntax for the five protocols discussed in the article form the digital stream is variable, as the composition of their units are divided into the types of digital stream blocks. The protocol defines the semantics of alphabets elements from the digital stream block and de-pends on the content of the voice messages.

 

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