In Japan, high-speed train ("Shinkansen") noise is strictly regulated by the government due to dense population. However, there is also a strong need for journey or travel time reduction. We have been developing high-speed, low noise, and low-energy consumption Shinkansen trains as well as noise barriers with high noise reduction efficiency for over 40 years. To evaluate the train noise and the performance of the noise barriers, we have been measuring the noise with portable noise equipment, which is a quite troublesome job and costly. Recently, we developed automatic noise measuring systems with combined Internet technology and noise measurement technologies. We discuss single microphone and multiple microphone noise monitoring systems in this paper.


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