Technical Report

What is fluctuation sound analysis?

Loudness and other sound quality evaluation indicator are now widely used to quantify the impression on human hearing in various fields. In recent year, there are many topics of tone color evaluation due to time fluctuation components or the abnormal sound detection. The roughness and fluctuation strength are general indicators for detecting abnormal sounds, but only specific time fluctuation components are extracted in either cases. However, since the mechanical fluctuation sound emitted from industrial products includes various fluctuation period, extracting only specific time fluctuation components is sometimes insufficient to extract those characteristic amounts. Therefore, not only the tone (high and low) of the sound but also the time fluctuation interval is possible to quantify by using an indicator (fluctuation sound analysis) that can quantify various time fluctuation components based on loudness.



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