RELIABILITY OF MAGNETIC TAPE MEMORIES,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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By lumping together noise associated with magnetic tape quality, inherent noise of signal processing circuits, and noise caused by mechanical sources such as flutter and tape-head channel crosstalk, the author expresses the reliability of digital tape readers as a function of probabilities of misreading 0 and 1. Assuming that noise follows a normal distribution pattern, the author shows that the probability of tape reader failure is a function of discriminator-threshold-level discerning between 0 and 1, and that this probability has a minimum and maximum value. A probability of failure for reading a random code is derived. These results are used to evaluate the reliability of the BESM-2M computer tape memory system. A method for finding the actual distribution of signal and noise amplitudes in this system is presented.
- Computer Hardware
- Recording and Playback Devices