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A research group at Tottori University is researching revolutionary noise reduction technologies. If the research group succeeds in making the technologies commercially viable, it would become possible to produce windows that screen out all noise but still allow air to pass through.

The active noise control (ANC) technology reduces noise by using antiphase sound to cancel the source of the sound that is creating noise. This is an effective method for countering most low-frequency sounds. However, there are many instances in which the problem actually lies with high-frequency sounds. This is the challenge that researchers are facing in using ANC technology for noise reduction of high-frequency sound waves.

It is possible to reduce noise by creating control sound wave fronts that synchronize with various incidental sound wave fronts. This antiphase sound effect can be achieved using a specially configured AAS unit.
(This is possible by setting up an AAS unit which includes a control unit, where the distance from a reference microphone to a control speaker is set up at a much shorter distance than the wavelength, and spaced at under half of the wavelength.)

The Tottori University research group is in the process of developing a noise reduction technology that permits sounds to pass through to harmless locations in contrast to previous technologies that focused on sealing contained noise. ( The acoustic energy is released inside the enclosure or chassis and sound emission from the duct opening is reduced.) This technology would likely prove useful in reducing the sound produced by cooling fans in OA equipment.

Surface texture optimization is another noise reduction technology that could prove useful in reducing the wind rushing sound generated by motor vehicles and aircraft. This technology softens airflow disturbances and reduces the occurrence of pressure fluctuation. It also blurs substance boundaries and weakens the strong discharge of slipstreams, both of which result in the occurrence of pressure fluctuations.

Duration : 0:3:0

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