FIELD: communications, in particular, for long-distance and international teleconferences or synchronization of sound of two parts of orchestra which are located in different cities, countries or continents. SUBSTANCE: both sides of device which are connected by means of digital multichannel communication lines 3 have video codec 4, audio codec 5, multiplexer-demultiplexer 6. Each audio codec on each side provides possibility to encode and decode sound signals in given bandwidth with encoding delay which is less than given threshold. Number of digital communication channels for transmission of encoded sound signals from each audio codec is equal to 
, where ΔF is given bandwidth, F is bandwidth of one digital communication channel, ]•[ is integer part of number. EFFECT: possibility of synchronization of sound which is simultaneously started or finished on both sides of system with unnoticeable delay. 8 cl, 2 dwg
