Measurement with verification of stationary signals and noise in extremely quiet environments: measuring below the noise floor

The Journal of the Acoustical Society of America
Roger M EllingsonGuillaume Bock

Abstract

It can be problematic to measure stationary acoustic sound pressure level in any environment when the target level approaches or lies below the minimum measureable sound pressure level of the measurement system itself. This minimum measureable level, referred to as the inherent measurement system noise floor, is generally established by noise emission characteristics of measurement system components such as microphones, preamplifiers, and other system circuitry. In this paper, methods are presented and shown accurate measuring stationary levels within 20 dB above and below this system noise floor. Methodology includes (1) measuring inherent measurement system noise, (2) subtractive energy based, inherent noise adjustment of levels affected by system noise floor, and (3) verifying accuracy of inherent noise adjustment technique. While generalizable to other purposes, the techniques presented here were specifically developed to quantify ambient noise levels in very quiet rooms used to evaluate free-field human hearing thresholds. Results obtained applying the methods to objectively measure and verify the ambient noise level in an extremely quiet room, using various measurement system noise floors and analysis bandwidths, are pres...Continue Reading

References

Aug 1, 1975·The Journal of the Acoustical Society of America·I L VérN Y Kiang
Jul 31, 2009·The Journal of the Acoustical Society of America·Finn Jacobsen, Alfonso Rodríguez Molares
Nov 26, 2010·Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society·Roger M Ellingson, Marilyn L Dille

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