| 术语 | double frequency recording (DF,2FM) |
| 释义 | double frequency recording (DF,2FM) 双频制,双频记录技术 A frequency modulation recording. The term is used because in writing 0-bits a flux reversal is made with every clock pulse and when writing 1-bits a reversal also takes place between clock pulses. Writing or reading 1-bits is, then, at “double the frequency" of writing or reading 0-bits. 一种调频制记录技术。使用这个术语是因为在写0位时磁通在每一个时钟脉冲产生翻转, 而在写1位时磁通在两个时钟脉冲之间还产生翻转,这样,读写1位是读写0位的“两倍频率"。 参阅frequency modulation。 |
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