SC-04-08 meeting report, online meeting, 2020-10

Report of the meeting of the SC-04-08 Working Group on Measurement and Equalization of sound systems in rooms, held online, 2020-10-08

Chair Peter Mapp could not attend so Richard Cabot filled in as chair.

In attendance were Richard Cabot, David Murphy, Thomas Lago, David Blore, David Andrews, Lon Neumann, Charlie Hughes, David Robb, Neil Shaw, Ian Robertson, Brian Long, Kurt Graffy.

The formal notice on patent policy was read.

Minutes of previous meeting online, 2020-05-28 were approved.

Projects assigned to this group but not mentioned here had no action requested or required - see for details.

Development projects

AES-X218: Measurement and calibration of sound systems in rooms.
The chair reviewed the system evaluation flow chart generated by Bruce Olson. He asked people to volunteer to write various sections. Thomas Lago offered to write RT60 and intelligibility.

Charlie Hughes wrote material on Max SPL material and submitted it privately to Peter Mapp. He will upload the material to the document repository.

David Murphy volunteered to review the existing BG noise measurement document.

There was much discussion of the circumstances when measurements will be misleading or should not be used. This is often encountered in very small rooms or when there is not enough uniformity of the sound field through the room. David Murphy and Thomas Lago will generate documents which detail the circumstances under which various measurements may be unreliable or misleading.

The document also needs material on measurement errors.

David Murphy discussed the issues with balancing subwoofer levels with system levels. He had loaded a paper he wrote on this topic to the document repository.

AES-X219: Method of measurement for frequency and impulse response of sound systems in auditoria
Project remains postponed, as per the 2015 NY meeting, until there is some output of X218


Neil Shaw reviewed the SMPTE 25CSS group activity on evaluating cinema B-chain performance.

Charlie Hughes said Info-Comm is developing documents on audio uniformity, spectral balance.

David Blore mentioned a paper at a recent machine learning conference used to estimate STI in a small room.

New Projects

No new projects were proposed.

New Business

No new business was proposed.

The next meeting will be scheduled in conjunction with the AES 150th Convention, to be held either face-to-face or online in May 2020.

AES - Audio Engineering Society