大家知道,人的讲话声在空气中传播的距离非常有限,将人的声音转变成电信号后借助导线传播的距离就可以大大提高。因此,为了把声音传送到很远的地方,在电话机中必须把自然声波转换成相应的电信号,再经导线传送到远方,到达目的地后,还要把电信号还原成原来的声音,以便收听。这就是发明电话机的初衷。电话机中将声音信号转换为电信号的器件叫送话器 As we all know, the sound of human speech is very limited in the air, and the distance it takes to spread people’s voices into electrical signals can be greatly enhanced by the use of wires. Therefore, in order to transmit the sound to a far away place, the natural sound wave must be converted into the corresponding electrical signal in the telephone and then transmitted to the distant place by the wire. After reaching the destination, the electrical signal must be restored to the original sound, To listen. This is the original intention of the invention of the telephone. A device that converts a sound signal into an electrical signal in a telephone