Tape modulation noise mechanisms were studied by measuring the noise power flux versus the magnetized depth. A dc current was applied to a small gap head to magnetize the tape. For wavelengths from 40 to 4 μm, current instrumentation tapes and a commercial video tape showed predominantly surface noise. Noise mechanisms will be discussed, including cross-correlation measurements of ac erased and dc saturated noises.
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Coutellier et al. (1987) studied this question.
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