Time Base Errors in Video Tape Packs

[+] Author and Article Information
S. Mukherjee

Department of Applied Mechanics, Stanford University, Stanford, Calif.

J. Appl. Mech 41(3), 625-630 (Sep 01, 1974) (6 pages) doi:10.1115/1.3423360 History: Received December 01, 1973; Revised March 01, 1974; Online July 12, 2010


This is a study of time base errors in video tape packs. The tape is viscoelastic. If a wound pack is stored at a constant temperature or subjected to environmental temperature cycles, the stresses relax and the tape creeps. Consequently, inelastic strains in the tape during playback cause distortion in the pictures. Time base error is a measure of inelastic longitudinal strain in the tape at playback. In this paper a mathematical model is developed to predict the effect of storage time, winding pattern, and pack size on time base error. Both the tape and hub are assumed elastic under hydrostatic loading and viscoelastic in shear. A four element fluid model is used for the tape and a Maxwell fluid model is used for the hub. Some comparison with experiments shows reasonable correlation.

Copyright © 1974 by ASME
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