FIELD: radio broadcast and sound recording of stereophonic signals. SUBSTANCE: additional signals are formed on the transmitting side by means of analysis of the current spectrum shape of l.h. and r.h. channels, these signals are coded and transmitted with the main signal, and on the receiving side the main and additional signals are separated, and the main and additional signals are filtered by filters, whose characteristics are controlled by a decoded additional signal, a monophonic signal is used as the main one. EFFECT: reduced scope of analysis, reduced quantity of necessary equipment, reduced flow of transmitted data. 2 dwg
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