FIELD: radio and communication engineering. SUBSTANCE: device designed, for example, for digital data transmission in telephony to receive multiple- frequency "two of six" code signals has communication-channel matching unit, low-frequency filter, analog-to-digital converter, rejection filter, linear detector, integrating section, matching-filter unit, four threshold elements, linear-detector unit, integrating-section unit, controlled-key unit, control timer, arithmetic unit, two adders, three ratio computing units, AND gate, and display unit. EFFECT: enhanced confidence of dual-frequency signal reception. 1 dwg
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