Apparatus and method for rotary head height measurement

摘要

In a rotary head height measuring system 50, a peak position detector 51 detects peak positions of output signals of rotary heads 62-65 mounted on a magnetic recording and reproduction system 60. A time difference detector 52 detects a time difference DELTA t between specific peaks based on the peak positions detected by the peak position detector means 51. An altitudinal dislocation calculating means 53 calculates an altitudinal dislocation DELTA h of a concerned rotary head based on the time difference DELTA t obtained by the time difference detector 52. During the measurement of rotary head height, a tape in the magnetic recording and reproduction system 60 is driven at a specific travelling speed which is k times a regular reproduction speed of magnetic recording and reproduction system, where k is not larger than -1 or not smaller than 2.