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AES Amsterdam 2008
Audio Archiving, Storage, Restoration, and Content Management
Paper Session P22
Tuesday, May 20, 09:00 — 11:00
Chair: Tin Jonker, NOB - Hilversum, The Netherlands
P22-1 Manufacturing Recordings from 100-Year-Old Masters—Sean Davies, S.W. Davies Ltd. - Aylesbury, UK; Rinus Hooning, Record Industry Bv - Haarlem, The Netherlands
Most work on the 78 rpm analog recording format concentrates on pressings made near to the time of the recording and the best ways to retrieve the information from these for future storage and reproduction. However, a considerable number of metal master plates have been preserved from the earliest days to the end of the format’s active period. This paper describes a project to manufacture new pressings from the original plates, the reasons for doing so, and the technical challenges involved.
Convention Paper 7456 (Purchase now)
P22-2 Replay of Digital Original Tapes: Practical Experiences with Video Tape Based PCM Adapters and R-DAT—Nadja Wallaszkovits, Austrian Academy of Sciences - Vienna, Austria; Heinrich Pichler, Audio Consultant - Vienna, Austria; Johannes Spitzbart, Austrian Academy of Sciences - Vienna, Austria
As many of the early digital formats are already obsolete and support of these formats cannot be guaranteed much longer by the manufacturers, archives should presently give priority to the replay of original recordings on such material. Based on a short theoretical discussion and outlining the format-specific characteristics, the paper discusses a variety of practical problems of signal retrieval from PCM (Pulse Code Modulation) encoded signals on a VTR (video tape recorder) and R-DAT (Rotary-Head Digital Audio Tape), such as mechanical problems, tracking problems and playback incompatibilities, data integrity checking, extraction and incompatibility of sub-code-information, pre-emphasis, as well as other problems occurring from irregular recording conditions (typically with field recordings produced on portable devices) or format peculiarity.
Convention Paper 7457 (Purchase now)
P22-3 A New System for File-Based Audio Recording, Preservation, and Access at Indiana University’s Jacobs School of Music—Konrad Strauss, Travis Gregg, Indiana University - Bloomington, IN, USA
The Indiana University Jacobs School of Music has been making live concert recordings on a variety of formats since the 1940s, and we continue to record approximately 500 concerts each year. Recent industry trends and changes in technology have led us to investigate the possibility of creating high-resolution digital files rather than continuing to use physical media as the archival format for our recordings. Our goal was to develop a system for the creation, access, and long-term preservation of high-resolution audio recordings and associated metadata that conformed to emerging standards for digital audio preservation. We began building such a system in July of 2006 and reached full implementation in February of 2007. This paper gives an overview of the development process, presents hardware and software solutions, and discusses workflow and data management issues.
Convention Paper 7458 (Purchase now)
P22-4 A Fast Feature Extraction System on Compressed Audio Data—Tobias Friedrich, Matthias Gruhne, Gerald Schuller, Fraunhofer Institute for Digital Media Technology - Ilmenau, Germany
We describe an efficient system that directly extracts features from compressed audio material. It consists of a time/frequency conversion method and a feature extraction algorithm. The conversion method provides the feature extraction algorithm with a suitable complex spectral representation directly from the compressed domain. It further allows a trade-off between computational complexity and conversion accuracy. Several operating points using different conversion accuracies were tested with an MPEG audio identification system in order to evaluate the identification confidence. Based on these results it is possible to reduce the computational complexity from O(N log N) to O(N) compared to the conventional approach (complete decoding followed by a frequency analysis).
Convention Paper 7459 (Purchase now)
Last Updated: 20080612, tendeloo