FIELD: acoustic equipment, in particular, conference communication equipment. SUBSTANCE: several microphones (M1, M3) are located in same plane P in symmetry about axis D which is perpendicular to plane P. Phase shift is provided for output signals of different microphones (M1, M3). Signals which are phase-shifted are added in order to suppress signals corresponding to any sound wave which enters all microphones in same phase and intensity. In addition device may have loud speaker 4 which is located on symmetry axis D and is directed along this axis in opposite to microphones. EFFECT: increased functional capabilities. 16 cl, 12 dwg
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