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自从贝尔发明了第一部电磁式电话机至今 ,只不过是125年的历史。此后,各种各样的电话机应运而生。可以这样认为,任何一部电话机均是由声能转换为电能,完成送话的过程;然后由电能特换为声能,完成受话的过程。这一声/电/声或电/声/电的换能过程,就是电话机最简单的工作原理。截止目前,已出现了多少种电话机呢?这里向读者作一简介。
Since Bell invented the first electromagnetic phone so far, it is only 125 years old. Since then, a variety of telephone came into being. Can think so, any telephone is converted from sound energy to electrical energy, to send the process to complete; then replaced by the electric energy for the sound energy, to complete the process of receiving the call. This sound / electricity / sound or electricity / sound / electricity transduction process, is the simplest phone works. How many phones have appeared so far?