UDC 621.395
STUDY OF NOISE-RESISTANT AND PROTECTED SPEECH SIGNAL TRANSMISSION SYSTEM BASED ON KHURGIN – YAKOVLEV REPRE-SENTATION
V. T. Dmitriev, Ph.D. (Tech.), head of department, RSREU, Ryazan, Russia;
orcid.org/0000-0001-5521-6886, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
M. S. Smirnov, student RSREU, Ryazan, Russia;
orcid.org/0000-0003-0064-8379, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
The research of reconstructed speech quality at the output of noise-immune and protected speech signal transmission systems based on V.A. Kotelnikov theorem and Khurgin – Yakovlev representation under the action of various interferences in a communication channel is made. The task of the study is to determine the best combinations of encryption and primary coding algorithms to achieve the best quality of restored speech information at the output of primary decoder under the influence of interference in a communication channel, as well as to study the application of V.A. Kotelnikov and Khurgin – Yakovlev representations in the construction of primary codecs. The aim of the work is to select and justify the algorithms for primary coding and encryption of noise-resistant and protected system for transmitting speech signals, which provides the highest value for assessing the quality of speech at the output of transmission system in a given range of transmission rates and interference in a communication channel. As a result of study, the best combinations of primary coding and encryption algorithms were selected, and the use of Khurgin – Yakovlev representa-tion was substantiated in order to improve restored speech quality, as well as noise immunity and security of transmitted information at the output of speech information transmission system.
Key words: noise immunity, security, noise-correcting coding algorithms, cryptographic algorithms for symmetric and asymmetric encryption, primary coding, speech signal transmission, speech signal codecs.