| 术语 | frequency modulation(FM) |
| 释义 | frequency modulation(FM) 频率调制(法);［频率调变,调频］ 1. A form of modulation in which the instantaneous frequency of a carrier wave is caused to depart from the normal carrier frequency by an amount proportional to the instantaneous amplitude of the modulating wave. 一种调制方式,使载波的瞬时频率偏离正常载频,偏离量与调制波的瞬时振幅成正比。 2. A method of recording data on a magnetizable surface. The direction of current in the recording coil is reversed at intervals determined by a clock sequence. If a 1 bit is to be recorded then the current is also reversed at the midpoint between clock pulses. These current changes produce corresponding changes in the orientation of the particles on the disk surface. 一种在可磁化表面上记录数据的方法,记录线圈中的电流在时钟序列确定的间隔内反转, 如果要记录的是二进制的1,则电流在时钟脉冲的中点还要反转。电流方向的变化将引起 磁盘表面上的粒子取向的变化。 |
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