FIELD: electrical engineering; electric telephone communications; acoustic control of locations. SUBSTANCE: transducer that has filter connected in series with two-wire communication line connected to microphone-effect load and high-frequency oscillator whose input is connected to first wire of two-wire communication line is provided, in addition, with series-connected low-frequency band amplifier, low-frequency filter, detector, band filter. Input of band filter is connected to second wire of two-wire communication line. Output of low-frequency band amplifier functions as transducer output. EFFECT: improved sensitivity of device. 7 dwg
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