| http://www.w3.org/ns/prov#value | - Phase errors between the pulses recorded in the longitudinal control track of the magnetic tape and, for example, a servo reference signal, such as a signal derived from the rotary position of the heads, are detected by phase error detector 57 and used as a component of the drive signal supplied to capstan motor 51 by way of summing circuit 54 and drive amplifier 58.
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