Previous developments used microphones that were installed in a specific place around the head
New system developed by the team fromSydney, involves work with both high and low frequencies. The researchers used a remote acoustic sensing system based on a laser Doppler vibrometer (LDV) that measures non-contact vibrations over a wide range. They placed a tiny jewelry-sized reflective membrane in the ear of a human model as a sensor for the LDV.
The system suppresses noise from multiple sources at once in the range up to 6 kHz with attenuation from 10 to 20 dB.
The new development can be used, for example, on an airplane. The only limitation is the high cost. Since the system uses LDV.
In the near future, developers will develop ways to reduce the cost of production.
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