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字词 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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更新时间:2026/10/24 0:05:30