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Tuesday, September 19 • 11:00 - 11:30
Saphir : using coloured light for recovering audio signal from challenging delaminated lacquer disk records

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Conventional mechanical playback cannot be used in the case of damaged lacquer audio disk records, used between 1930 and 1960 by a large number of radio broadcasters and archives. INA has developed optical tools and software for the recovery of such records.
The Saphir scanner uses an original approach, by casting a structured coloured light beam onto a small area of the disk surface, and uses a standard video sensor for acquiring rings of pictures. From the collected pictures, the software allows to decode a wide range of audio disks recording types, from early Berliner to stampers and 33rpm vinyl disks, but its strength is at recovering the signals from lacquer recordings, even severely damaged (broken, cracked, delaminated). Extreme examples with numerous cracks and missing flakes will be demonstrated.
We will present our efforts towards replicating the scanner, making the tools available to INA, other audio archives, and service providers, with the objective of opening up the potential for recovering this highly endangered part of the audio heritage.

avatar for Bruce Gordon

Bruce Gordon

Audio Engineer/Media Preservation Services, Harvard University

avatar for Jean-Hugues Chenot

Jean-Hugues Chenot

R&D project manager, INA
SIgnal processing. Audiovisual media. Optical playback ofdamaged analogue audio disks.

Tuesday September 19, 2017 11:00 - 11:30
Ethnologisches Museum, Room 1 (Auditorium, off the Lower Foyer) Lansstraße 8, Berlin, Germany

Attendees (18)