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MAI CREATED THE DEVICE FOR CONVERSION OF ULTRASOUND INTO THE AUDIBLE RANGE

December 17, 2021


MAI experts elaborated a device for ultrasonic waves conversion into the audible
range with the structure of the spectrum preserved. First of all, it is planned
to use the development in order to study the behavior of insects and bats. It
will also be useful for possible gas leakages detection, corona and spark
discharges, structure analysis of ultrasonic noise for labor protection
purposes, etc.

The project is being implemented by Maria Zolotenkova, the professor of the
Signal student design bureau of Institute No. 4, Radioelectronics,
Communications and Information Security, and Vasily Egorov, senior lecturer at
the 410 Department of Radiolocation, Radio Navigation and Airborne
Radioelectronic Equipment, MAI. The prototype has already been assembled.

– The device is designed to transfer signals of the 20-40 kHz spectrum into the
audible range, – says Maria Zolotenkova. – This allows them to be further
processed using sound cards of computers or smartphones, designed to work with
signals of the audible range.

The assembled prototype consists of two compact blocks: each of them fits in the
palm of a person’s hand. The first unit contains a microphone, a preamplifier
and a power supply module with lithium-polymer batteries. The microphone is
pointed directly to the ultrasound source, after which the received signal is
amplified and fed through the cable to the second module, where the spectral
range of audible frequencies is suppressed, and the spectral components of the
20-40 kHz range are transferred to the 0-20 kHz range. The user hears the signal
received after such a conversion through headphones. It can also be recorded by
standard means of any smartphone or computer.

– Our invention might be used for biological research problems. For example, to
study the behavior of bees, whose population decline in recent years has become
an urgent problem for the whole world, – says Maria Zolotenkova. – The device is
also well suited for studying populations of nocturnal insects in the small
area. And for some technical tasks, such as searching for wasp hives in
structural parts of an aircraft.

Special attention was paid to preserving the structure of the signal spectrum
and minimizing the introduced distortion and interference within the course of
the work. This is how MAI device differs from the only analogue in Russia
developed by the Voronezh State University.

MAI residents are modernizing the device, increasing its sensitivity and the
degree of suppression of the frequencies of the audio range of the input signal,
and full-scale experiments are planned for the summer of 2022. The further plans
of the authors are to establish cooperation with the Moscow Zoo, as well as with
a number of biosphere reserves and research centers.

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