这里介绍一种新的脉冲调相制(双相位法),它是为了克服通常归零制及不归零制在高密度记录情况下存在的困难而采用的。虽然这种方法要求每位信息具有最大的磁通翻转,但是,因其窄频带特性的缘故,能使波形做到比较对称,且幅度及峰值位置的畸变较小。若从每位带宽周期的利用情况来看, Here, we introduce a new pulse phase modulation (biphase method), which is used to overcome the usual zero-and non-return-to-zero system in the case of high-density recording difficulties exist. Although this method requires that each message has the maximum flux reversal, the waveform can be made more symmetrical and less distorted in amplitude and peak position due to its narrow frequency band characteristics. From the utilization of each bandwidth cycle point of view,