frequency modulation(FM)

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.; 一種調制方式,使載波的瞬時頻率偏離正常載頻,偏離量與調制波的瞬時振幅成正比。 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. | 一種在可磁化表面上記錄數據的方法,記錄線圈中的電流在時鐘序列確定的間隔內反轉, 如果要記錄的是二進制的1,則電流在時鐘脈沖的中點還要反轉。電流方向的變化將引起 磁盤表面上的粒子取向的變化。