This paper discusses the application of today's technology to the retrieval and restoration/preservation of audio sources. It outlines the technical growth of the recording industry, as well as its parallel industries (plating, cutting, and pressing), a thorough understanding of which is necessary for competent restoration work. Restoration equipment, the use of spectrum analyzers, voice identifications, and digital techniques of restoration are discussed.
https://www.aes.org/e-lib/browse.cfm?elib=12016
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