SC-04-04 meeting, Berlin, 2014-04

Report of the Meeting of the SC-04-04 Working Group on Microphone Measurement and Characterization of the SC-04 Subcommittee on Acoustics, held in Berlin, Germany, 2014-04-28

The meeting was convened by chair D. Josephson.

The draft agenda and the meeting report from New York, 2013-10-19, were approved as written.

Projects assigned to this group but not mentioned here had no action requested or required - see www.aes.org/standards/meetings/project-status.cfm for details.

Development projects

AES-X085 Detailed Professional Microphone Specifications
Discussion continued on this project. In general, due to recent revisions in IEC 60268-4, this project is moving toward a recommended practice for making measurements compliant with that standard, rather than a special set of measurements to be made in addition. Work continues primarily on defining a generalized description of the noise measurement metric in ITU-R BS.468-4. The problem remains that different commercial instruments produce different results while measuring the same signal due to ambiguity in specification of the quasi-peak detector time response in the ITU-R method. H. Riekehof-Boehmer reported on some preliminary results in defining the measurement algorithm needed to implement this method. E. Brixen and M. Yonge will ask contacts at B&K (E. S. Olsen) and Audio Precision (T. Kite) once again if there is any possibility that these companies can release the measurement algorithm used in making ITU-R measurements using their equipment. Discussion to continue on the reflector.

There is also further refinement and generalization of the wind and pop measurements. Brixen and J. Breitlow to report on this work at the next meeting.

A topic for future discussion might be to define, in the context of EMC compliance, what degradation in performance would be reasonably expected when subject to interfering fields in accordance with CISPR standards.

New Projects

No additional liaison matters were discussed.

New Projects

J. Breitlow proposed a new project, and will submit a project initiation request, to define the naming convention for microphone controls in the context of digital audio networking standards. M. Yonge suggested that the goal for this project would be a report to SC-07-01 to produce an output compliant with relevant core metadata standards.

New Business

No new business was proposed.

Next meeting wil be scheduled in conjunction with the 137th convention in Los Angeles, 9 to 12 October 2014.

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