JPS6429910A - Position error compensating system - Google Patents

Abstract

PURPOSE:To compensate the erroneous detection of a position error signal in a recorder, by re-calculating a driving signal setting the output value of a position error prediction means as a position error. CONSTITUTION:A position error inverse operation means 5 calculates a position error signal prediction value (d) based on a driving signal prediction value (c) calculated by a driving signal prediction means 2. A comparison means 3 drives switches S1 and S2 when a driving signal value (b) is not set within a range designated in advance by the driving signal prediction value (c), and inputs the driving signal prediction value (c) to a magnetic head driving mechanism 4 as the driving signal, and inputs the driving signal prediction value (c) to the driving signal prediction means 2 as the driving signal (e) of a present sample time. Furthermore, a switch S3 is closed to the position error inverse operation means 5 side, and the position error signal prediction value (d) is inputted to a driving signal calculation means 1 as the position error signal, and the retry of the calculation of the driving signal is performed, then, an internal calculation value is obtained. In such a way, the position error signal (a) can be compensated by detecting the abnormality of the driving signal (b).