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Instruments and Systems: Monitoring, Control, and Diagnostics

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Calibration of a Remote Acoustic Signal Assessment System in an Urban Environment
V.V. BULKIN, S.S. KOZLOV, YA.D. MOLCHANOV

Obtaining data on the nature of acoustic noise propagation in an urban environment requires the use of at least two-channel meters (noise meters).
The structure of such a noise meter is proposed. One of the microphones is installed at a point near the noise source, and the second one is located at
a distance, along the path of noise propagation into the depths of the residential area. The signal from the microphones is transmitted by transmitting
devices, a two-channel receiver is connected to the processing unit, where the spectrum of the received acoustic signal is recorded. One of the
problems in the construction of such a meter is to ensure the reliability of measurements. It is proposed to use a microphone calibrator to assess the
reliability. The verifi cation of this principle was carried out using a system model created using ready-made components. It is found that the absolute
calibration error at a distance of up to 240 meters lies in the range of –0,25 ≤ Δxi ≤ 0,65 dB. The conclusion is made about the suffi cient degree of
reliability of such measurements.
Keywords: acoustic signal, calibration, measurement system, confi dence interval, information transmission device, radio signal, receiving and
processing device.


DOI: 10.25791/pribor.11.2024.1534

Pp. 06-12.

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