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Prominent discrete tone procedure: The existing engi- neering-grade fast Fourier transform (FFT) procedure in ISO 1996-2 will be replaced by a tone-to-noise ratio procedure based on DIN 45680. The new FFT procedure is similar to the tone- to-noise ratio procedures in ANSI/ASA S1.13 Annex A and ANSI/ASA S12.10 Part 1. The new tone method has procedures for handling tones in which the tone frequency changes, such as from wind turbines. The survey-grade one-third octave band method will not change, which is the same as that in ANSI/ASA S12.9 Part 3. Both WG 45 and ISO/TC 43/SC 1 are hopeful that the new tone procedure in ISO 1996-2 will be the basis for a stand-alone tone procedure, which would be referenced by both ISO 7779 (information technology equipment noise) and IEC 61400-11 (wind turbine noise).
Wind Turbine Noise: Paul Schomer stated that WG 45 is addressing two issues of wind turbine noise: 1) physical pre- diction of wind turbine noise in the environment and 2) human response. WG 45 agreed to publish a technical report initially instead of a standard.
WG 45 has not progressed much on the technical report; however, there was a lively discussion on possible effects from low frequency noise and infrasound from wind turbines. Paul Schomer opined that low frequency noise or infrasound from wind turbines could cause adverse health effects in some peo- ple who are prone to sea sickness; he estimated that this could affect only 0.1% to 1% of the exposed population. His assertion is based on both self-reported claims from some residents near wind turbines and results reported in journal articles concern- ing low frequency sound and infrasound from other sources. However, Hideki Tachibana from Japan presented recent research that he said demonstrates that low frequency noise and infrasound from wind turbines are not a problem (refer to his INTER-NOISE 2012 paper for preliminary information on his research.) This debate will continue as more research is conducted and published!
Impulse Noise: Doug Manville (Denmark) reported that the UK is considering revising BS 4142:1997 to include an objective method of identifying impulse corrections, and he will liaise with this development.
ISO/TC 43/SC 1/WG 45 next meeting: The next meeting will be sometime in 2013 – the date and place has not been set.
III. ISO/TC 43/SC 1 Plenary meeting:
Paul Schomer led the US delegation, and other US dele- gates were: Elliott Berger, Joseph Bocchiaro, Doug Moore, Laura Wilber and Robert Hellweg. SC 1 confirmed several standards and approved the circulation of numerous draft stan- dards and several PWIs. Of particular note are the following:
During the SC 1 plenary meeting Joseph Bocchiaro of InfoComm International presented a US proposal for SC 1 to consider the international adoption of their American National Standard, ANSI/INFOCOMM 1M-2009, Audio Coverage Uniformity in Enclosed Spaces. Bocchiaro indi- cated that this would be the first of several standards. There was agreement that this was needed, but there was much discussion on whether the standards should be Audio Engineering Society (AES) or ISO standards. Schomer and Bocchiaro explained that they considered AES, but decided that the work was better suited in ISO/TC 43. There was more discussion on whether it should be in ISO TC 43/SC 1 or ISO/TC 43/SC 2 (Building Acoustics). It was agreed that the US would submit a revised new work item propos- al to SC 1 with the existing ANSI/INFOCOMM standard as Part 1. Bocchiaro will prepare this proposal for SC 1 ballot.
With the resignation of William Lang as convener of WG 28, SC 1 appointed Robert Hellweg as convener of WG 28. There were numerous expressions of gratitude and apprecia- tion to Bill Lang for providing leadership and years of service as convener of WG 28.
ISO TC43/SC1 next meeting: The next meeting of ISO/TC 43/SC 1 will be in Berlin at the Deutsches Institut für Normung (DIN) offices during the week of May 19 – 23, 2014.
IV. ISO/TC 43 Plenary meeting
Paul Schomer led the US delegation, and other US dele- gates were: Elliott Berger, Doug Moore, Laura Wilber and Hellweg. Of particular note is the following:
TC 43 agreed to continue WG 8 and will accept a PWI entitled “Test methods for qualification of free-field environ- ment.” Jeff Schmitt was appointed as convener of WG 8.
ISO/TC 43 next meeting: The next meeting of ISO/TC 43 will be in Berlin at the DIN offices during the week of May 19–23, 2014. AT
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