The noise of various kinds of commercially available tape was measured in legit filter bands from 100 cps to 100 kc by means of standard and readily available equipment, with the exception of the filters. The corrections necessary because of the use of the logit filters and the various electrical and physical characteristics of the head and the reproduce process are described and considered. The results of the measurements are presented in terms of noise spectra as a function of the type of erasure, backing thickness, orientation of the magnetic coating, and tape speed. The actual noise voltages encountered are also shown.
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