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    • 78. 发明授权
    • Digital signal magnetic recording and reproducing apparatus for both
metal evaporation tapes and metal powder tapes
    • 用于金属蒸发带和金属粉末带的数字信号磁记录和再现装置
    • US5587848A
    • 1996-12-24
    • US423727
    • 1995-04-18
    • Masafumi ShimotashiroAkio Kuroe
    • Masafumi ShimotashiroAkio Kuroe
    • G11B5/02G11B5/09
    • G11B5/09G11B5/02
    • In a magnetic recording and reproducing apparatus, a recording current setting circuit sets a recording current to be larger by 1 dB or more than a recording current which maximizes a reproduced signal level in correspondence to the shortest recording wavelength in digital signals to be recorded. Recording is performed with a magnetic head onto a metal powder tape including a magnetic layer of thickness having a 0.2 .mu.m or less. Thus, an overwrite characteristic can be obtained which are generally similar to that of a metal evaporation tape. Further, on reproduction, either an output from a equalizer circuit for a metal evaporation tape or an output from another equalizer circuit for a metal powder tape is selected by a switch circuit according to an output of a tape type detection circuit, and loop control gain of a tracking control circuit is changed according to the detected tape type. Thus, both metal powder tapes and metal evaporation tapes can be used.
    • 在磁记录和再现装置中,记录电流设置电路将记录电流设置为比要记录的数字信号中与最短记录波长相对应的再现信号电平最大化的记录电流大1dB或更大。 用磁头进行记录到包括0.2μm或更小的厚度的磁性层的金属粉末带上。 因此,可以获得与金属蒸发带大致相似的重写特性。 此外,在再现时,根据带式检测电路的输出,通过开关电路来选择用于金属蒸发带的均衡器电路的输出或来自另一金属粉末带的均衡器电路的输出,并且环路控制增益 的跟踪控制电路根据检测到的磁带类型而改变。 因此,可以使用金属粉末带和金属蒸发带。