SignalCalc Acoustics

Octave and fractional octave bands have been used for several decades now in the characterization of acoustic energy in various applications. Early analyzers were essentially comprised of analog filter banks. Band filtered data resulted in fewer numbers, making data easier to pass around before the advent of powerful PC-based systems that we are accustomed to today.

Standards developed for acoustic applications were therefore based on filtered data, and this has largely resulted in the need for continued analysis using true filtered octave and fractional octave analysis. Practically speaking, however, the human response to noise and vibration is very non-linear in nature and most mechanical systems have a behavior that is best characterized by proportional bandwidth analysis.

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