TY JOUR TI EFFECTIVENESS INCREASE IN AUDIO EXCHANGE TELECOMMUNICATION SYSTEMS UNDER CONDITIONS OF EXTERNAL ACOUSTIC NOISE BY METHODS OF ADAPTIVE FILTERING KW “signal-acoustic noise” ratio KW speech signals KW telecommunication signals KW adaptive filtering KW spectral function KW acoustic noise JO Bulletin of Bryansk state technical university AU Kropotov, Y.A. AU Belov, A.A. AU Proskuryakov, A.Y. PY 2019 IS 2019 PB Bryansk State Technical University