Magnetic tape analysis 'sees' tampering in detail

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This image produced by the new NIST forensic tape analysis system clearly reveals an overdubbing. The new recording is visible from the left bottom of the image to about 188 millimeters on the distance counter the large smudge at 216 mm was made by t ...
This image, produced by the new NIST forensic tape analysis system, clearly reveals an overdubbing. The new recording is visible from the left bottom of the image to about 188 millimeters on the distance counter, the large smudge at 216 mm was made by the erase head, and the original recording is visible starting at about 220 mm. Credit: Credit: NIST
The National Institute of Standards and Technology has developed an improved version of a real-time magnetic microscopy system that converts evidence of tampering on magnetic audio and video tapes—erasing, overdubbing and other alterations—into images with four times the resolution previously available.


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