AES Store

Journal Forum

Perceptual Effects of Dynamic Range Compression in Popular Music Recordings - January 2014

Accurate Calculation of Radiation and Diffraction from Loudspeaker Enclosures at Low Frequency - June 2013

New Measurement Techniques for Portable Listening Devices: Technical Report - October 2013
1 comment

Access Journal Forum

AES E-Library

Derivation of a Transfer Function for Imaging Polarimetry Used in Magneto-Optical Investigations of Audio Tapes in Authenticity Investigations

One of the main questions forensic tape authenticity investigations seek to answer is whether a recording on a given tape was produced using a given recorder in a claimed way. A technique that uses so-called ferrimagnetic garnet films, also known as Faraday crystals, makes it possible to take pictures showing the magnetic flux distribution on a tape in such detail that it enables a forensic investigator to answer questions that may arise about the correctness of the claims made. For an in-depth understanding of pictures of these flux distributions, a theory behind the visualization technique is necessary. The derivation of a theoretical transfer function of the visualization technique (spanning from a theoretical input signal to the actual luminance of the pictures) is described and one of a few experiments that were conducted to prove its validity is presented.

JAES Volume 55 Issue 4 pp. 257-265; April 2007
Publication Date:

Click to purchase paper or login as an AES member. If your company or school subscribes to the AES Journal then you can look for this paper in the institutional version of the Online Journal. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.

Learn more about the AES E-Library

E-Library Location:

Start a discussion about this paper!

Facebook   Twitter   LinkedIn   Google+   YouTube   RSS News Feeds  
AES - Audio Engineering Society