FIELD: radio engineering, communication.
SUBSTANCE: device has a microphone (1), a preamplifier (2), an analogue-to-digital converter (3), a time slot generator (4), a signal spectral representation unit (7), a low-pass filter (5), a unit (6) for estimating change in signal level within a time slot, a maximum determining unit (8), a frequency correction unit (9), a threshold calculating unit (10), a first threshold device (11), a second threshold device (12) and an AND circuit (13).
EFFECT: high efficiency of the device.
6 dwg
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