Audio Engineering Society Standards Committee

December 2001 meeting of SC-03-01

[Last printing 26 April 2002] Report of the SC-03-01 Working Group on Analog Recording of the SC-03 Subcommittee on Subcommittee on the Preservation and Restoration of Audio Recording meeting, held in conjunction with the AES 111th Convention in New York City, NY, US, 2001-12-01.

Chair J. McKnight convened the meeting. The agenda were approved but the report from the previous meeting at the AES 109th Convention not available. The report of the meeting at the 108th convention was approved as modified to change "two-signal mode" to "two-sigma mode."

Current development projects

AES6-R Revision of AES6-1982 (r2001) Method for measurement of weighted peak flutter of sound recording and reproducing equipment

The chair reported problems with the incorporation of the amendment to IEC 60386 into the document. He has not been able to obtain enough of the background material thus far and asked to extend the goal to 2002-05.

He said new measurements of psychophysical factors in flutter perception are needed in order to update the standard. He will approach the Technical Committee on Perception of Audio for help. The concern is mainly for scrape flutter, including frequency modulation noise from 100 Hz upward.

D. Schueller reported difficulties using the DIN standard, as well as the similar IEC and AES standards, particularly when trying to evaluate scrape flutter. But because the newer generations of tape playing equipment largely eliminated this problem, the deficiency was not corrected. However, now, because of the needs of archivists, such a measurement has again become desireable. He related experiences show low scrape flutter when replaying old tapes with special machines having only playback heads and special guides.

McKnight pointed out that many experiences have been with machines having many variables so that the effects of high-frequency flutter could not be separated from other effects. He said research is needed in order to define the measurement better.

AES7-R Review of AES7-2000 AES standard for the preservation and restoration of audio recording -- Method of measuring recorded fluxivity of magnetic sound records at medium wavelengths

No action was taken

New projects

No project requests were received or introduced.

New Business

There was no new business

The next meeting is scheduled to be held in conjunction with the AES 112th Convention in Munich, Germany.


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