Open AccessNon‐Contact Imaging of the Magnetic Signature of Historical Tape Recordings
Author(s) -
Blondeau Jean,
Franke Ute
Publication year - 2019
Publication title -
photonicsviews
Language(s) - English
Resource type - Journals
eISSN - 2626-1308
pISSN - 2626-1294
DOI - 10.1002/phvs.201900016
Subject(s) - magnetic tape , signature (topology) , waveform , digitization , faraday cage , computer science , copying , magnetization , computer graphics (images) , acoustics , physics , optics , digital recording , telecommunications , mathematics , magnetic field , geometry , radar , quantum mechanics , political science , law
Historically valuable film material, dating from the first half of the last century, is prone to decay. A non‐contact magneto‐optical method according to Faraday was used to directly read the magnetization in the tape as an imaging of the magnetic signature. For this purpose, a special winding table has been developed which enables the evaluation of the analogue waveform over the entire length of the tape. The sensor system can be integrated into existing film copying tables or future digitization or restoration systems. All main octaves (six main octaves corresponding to 125 Hz to 8000 Hz) can be captured, mapped, corrected, and reproduced.