Signal Extraction from Instantaneous Lacquer Discs - Overview and Procedures
Delve into the world of lacquer discs with a comprehensive guide on signal extraction, format characteristics, preservation techniques, and stylus selection. Explore the Emelie Hooke lacquer disc collection and learn about the transfer workflow, cleaning, and preparation steps involved in handling these unique recording media.
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Signal Extraction from Instantaneous Lacquer Discs Robert Cowlin
Introduction to Lacquer Discs 2 www.bl.uk
Also known as Laminate disc Transcription disc Instantaneous disc "Acetate" disc Direct-cut disc. 3 www.bl.uk
Format Characteristics (c.1940) Frequency response: 50 Hz 8 kHz (dictated by cutting head) Signal-to-noise ratio: >50 dB Sizes: 5 , 7 , 10 , 12 , 13 , 14 , 15 , 16 . 4 www.bl.uk
Emelie Hooke lacquer disc collection 5 www.bl.uk
Transfer Workflow 6 www.bl.uk
Preparation 7 www.bl.uk
Cleaning 8 www.bl.uk
9 www.bl.uk
Before and After 11 www.bl.uk
Choosing the Stylus 12 www.bl.uk
Jim Lesurf, Hi-Fi News 13 www.bl.uk
14 www.bl.uk
15 www.bl.uk
16 www.bl.uk
Coarse groove styli 17 www.bl.uk
Selecting a stylus without wearing out the disc 18 www.bl.uk
Equalisation Peter Copland, Manual of Analogue Audio Restoration Techniques 19 www.bl.uk
Final preparation 20 www.bl.uk
Capture 21 www.bl.uk
Playback 22 www.bl.uk
Further reading Beardsley, R. and Leech-Wilkinson, D. (2009). A Brief History of Recording to ca. 1950. www.charm.rhul.ac.uk/history/p20_4_1.html Copeland, Peter. Manual of Analogue Audio Restoration Techniques. The British Library. Fantel, Hans. Fabulous Phono Cartridges: 4 Channels and 50,000 Hz . Popular Mechanics, April, 1975. Guidelines on the Production and Preservation of Digital Audio Objects. www.iasa-web.org/tc04/audio-preservation Lesurf, J. (2007). Around the Bend. www.audiomisc.co.uk/HFN/LP3/aroundthebend.html Phonograph Pickup Stylus. US3774918A. Victor Company of Japan, Ltd., 1973. Presto Instantaneous Sound Recording Equipment and Discs. New York: Presto Recording Corporation, 1940. Street, Sean. Historical Dictionary of British Radio. Lanham: Rowman & Littlefield, 2015. 23 www.bl.uk
Thank you Robert.Cowlin@bl.uk @cowlin_robert www.bl.uk 24
