发明授权
US6154332A System for recording and reproducing data having scheme for minimizing variation in record track width when recording at different data rates 失效
用于记录和再现数据的系统,具有用于在以不同数据速率记录时最小化记录轨道宽度的变化的方案

System for recording and reproducing data having scheme for minimizing
variation in record track width when recording at different data rates
摘要:
At least three heads are mounted on a rotary drum. Between the first and third heads which are located in close proximity to each other and have different azimuth angles, an intentionally provided minute height difference is formed in the rotation shaft direction of the rotary drum. Signals of a plurality of data rates are recorded and reproduced by using the first and second heads or the first and third heads. Two heads having the same azimuth angle are disposed on the rotary drum so as to be opposed each other at a central angle of 180.degree.. In search speed reproduction, search data are reproduced by the two heads. Tracks are divided in the unit of plural tracks so as to form track sets. Search data areas of each track set are disposed at a position of each track which is separated from the edge of a tape by a predetermined distance. In search speed reproduction, the phases of the tracks and the heads are controlled, and all effective data of the search data areas are reproduced by plural scans of the heads.
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