在录音过程中,当磁带通过录音磁头时,磁带上的磁性涂复层被录音磁头缝隙溢出的磁场磁化。磁带离开缝隙磁场后,便在磁带上留下磁化的信号,这就是平常所说的剩余磁通。这样的磁带通过放音磁头时,剩余磁通并不能全部被放音磁头的缝隙拾取。为了计量这样的剩余磁通,国际上都是一致采用理想化的短路带磁通概念,简称为“带磁通”。这是一种比 During recording, the magnetic coating on the tape is magnetized by the magnetic field that overflows the recording head gap as the tape passes through the recording head. After the tape leaves the gap magnetic field, it will leave a magnetized signal on the tape, which is commonly referred to as residual flux. When such a tape passes the playback head, the remaining magnetic flux can not be picked up by the gap of the playback head. In order to measure such residual flux, the concept of idealized short-circuit flux is adopted consistently in the world, referred to as “with flux”. This is a ratio