“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.”

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“3D real time calculation of noise source in anechoic chamber – More videos and information at www.acoustic-camera.com.”