FIELD: multiple-channel telephone equipment, in particular, for confidential information transmission. SUBSTANCE: device has serial circuit of orthogonal signals generator, clock pulse oscillator, two delay gates, adder and linear unit. In addition device has modulation signal selection units, modulation units, input unit, amplifiers, control signal generator, and random sequence generator. Number of modulation units and amplifiers is equal to number of channels. Addition of modulated equal frequency spectrum signals which differ by quarter phase shift and belong to same voice channel provides masking of frequency constituents which carry information about harmonics frequency. EFFECT: increased functional capabilities. 1 dwg
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