声音是物体的振动产生的。物体的振动引起空气的振动,传到人的耳朵以后引起耳膜的振动,通过听觉神经传到大脑,使人听到了声音。这个过程中首先需要振动源(就是发声的物体),同时需要传播振动的介质(在真空中声音是不能传播的),然后才是接收声音的人耳。如果用一个话筒来代替人耳,使得声音的振动转化成电信号,以电信号电压的变化表示声音的变化,这就是模拟音频信号;普通物理学告诉我们,磁和电是一对亲密无闯的好兄弟,模拟音频信号可以转化成磁信号,而磁信号可以存储在磁带中.还可以转化成机械轨迹固化在唱片中,这就是模拟音频的 Sound is generated by the vibration of the object. The vibration of the object causes the air to vibrate, causing the eardrum to vibrate after it reaches the human ear and is heard by the auditory nerve to the brain. In this process, the vibration source (which is the object of sounding) is first required. At the same time, it is necessary to propagate the vibrating medium (the sound can not be transmitted in the vacuum) and then the ear receiving the sound. If you use a microphone instead of the human ear, so that the vibration of the sound into electrical signals, electrical signal voltage changes that voice changes, which is the analog audio signal; general physics tells us that magnetic and electrical is a pair of intimate Good brothers, analog audio signals can be converted into magnetic signals, magnetic signals can be stored in the tape can also be converted into a mechanical track curing in the record, which is analog audio