| 摘要 |
Drawing on the observation that a signal which is magnetically recorded near the edge of a magnetic tape not only projects a magnetic field that is above (and below) the plane of the tape, but also projects a field that extends away from the edge thereof, the invention calls for (tracking-) control of relative head-to-tape positioning in response to the edge-projected field of a pre-recorded edge-positioned tracking control signal, whereby the tightness of such control is governed directly by the spacing loss equation.
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