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• Because there is no IEC standard on requirements for computerized data-acquisition systems, a proposed instru- mentation guide for the TC43 measurement standards was discussed. The guide, prepared in part by Schmitt, would address requirements for the use of multichannel comput- erized data-acquisition systems as an alternative to the IEC 61672 standards on sound level meters, which are not ap- plicable to computerized systems.
TC43/WG9 (Loudness), with Wilber as convener, is devel- oping two standards as a revision to the Zwicker method in ISO 532:1975: ISO/CD 532-1 (revised Zwicker method) and ISO/CD 532-2 (Moore-Glasberg method), which do not yield the same results. The United States proposed Part 2, which is similar to ANSI/ASA 3.4-2007. Comments were discussed, and for both methods, it was agreed to prepare draft standards for international voting after resolution of the remaining comments. Work will begin on Part 3 for de- termining the loudness for time-varying signals based on the Moore-Glasberg method.
SC1/WG45 (Environmental Noise), with Hellweg partici- pating, began work on a standard for measuring and eval-
uating wind turbine noise in the environment. Two ASA/ ANSI standards are relevant: draft S12.9 Part 7 (Low Fre- quency and Infrasound) and S12.100 (Background Sound in Quiet Areas). WG45 also began working on a standard to determine the prominence of impulsive noise.
TC43 and SC1 Plenary Meetings
The US delegates to TC43 and SC1 plenaries were Hellweg, Lai, Moore, Wilber, and Davies (only SC1). TC43 and SC1 confirmed several standards and approved the circulation of numerous draft standards. SC1 approved the circulation of a ballot to form a new WG on “Tonal Prominence,” and the United States will actively participate in this WG.
Summary
It is important for the United States to have effective repre- sentation at the ISO WG meetings because the responses to comments on draft standards are determined during these meetings. The authors believe we were successful overall in accomplishing our goals and are thankful to have received the ASA Robert Young Travel Award. If you wish further in- formation, please contact the authors.
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