ПОВЫШЕНИЕ ЭФФЕКТИВНОСТИ ТЕЛЕКОММУНИКАЦИОННЫХ СИСТЕМ АУДИООБМЕНА В УСЛОВИЯХ ВНЕШНИХ АКУСТИЧЕСКИХ ПОМЕХ МЕТОДАМИ АДАПТИВНОЙ ФИЛЬТРАЦИИ

Abstract

Signal processing in the telecommunication systems of audioinformation exchange is conditioned on the requirement in the separation of useful speech acoustic information, in the increase of the verification of information perception by subscribers of a communication system, in the stability increase of telecommunication systems at the suppression of external acoustic interference and echosignal compensations. Therefore during designing telecommunication systems, in particular, speakerphone systems (SS) operating under conditions of an active impact of external acoustic interference and echosignals, there is specified a problem of the algorithm formation of efficient noise suppression for an essential “signal-noise” ratio support. 
 The investigation object is design methods of adaptive algorithms for speech signals processing and acoustic interference suppression at the expense of the controlled change of a rejection area in the range from 0 to 300…1000Hz depending on an interference situation. 
 The work aim is an investigation of the speech signals characteristics and acoustic noise of different nature and also problems consideration in the matter of an algorithm creation for adaptive filtering and suppression of external acoustic interference and echosignals. At that the increase of the “signal-acoustic interference” ratio in the systems of audioexchange telecommunications is carried out through the methods of adaptive filtering. 
 The results obtained in the course of the investigations of different acoustic interference suppression show that through the method of linear filtering in the system of telecommunications of speech information exchange it is possible to ensure the essential ratio Rs/Rak.pom. >20 dB and, accordingly, an essential syllab-ic legibility S ≥ 93%.