Present standard measuring methods condensed in ISO recommendation R.140 are discussed and changes proposed, based on our experience. Our own standard tapping machine has been checked against controlled subjective appraisals and found in good agreement with objective rating methods, once adjusted by our proposed changes. Airborne insulation is evaluated in the form of “Q” (quality) factors derived from standard tests that we believe express the insulation properties of partitions more accurately than TL. NRC, or speech-privacy computations used to date.
A critical review of methods and instrumentation used to date for objective measurements is followed by a discussion of the subjective evaluations and their applicability to legislation and control of noise. A method of quick computation based on S. S. Stevens' Mark VI is proposed to set up criteria for traffic and industrial noise. Possibilities of simpler checkup methods for restrictive purposes are explored in view of the uncertainties derived from sound-level-meter readings.
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