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? Voice recorder is to record voices for playback machines, which hard-magnetic material as a carrier，Hard-magnetic material as a carrier of the remanent magnetic properties using the sound signal recorded in the carrier. Most of the cassette tape recorder home recorder. Let's us see voice recorder's history.

? Earlier called the phonograph voice recorder, was born in 1877,The invention is acclaimed King - Edison made. Edison by phone walkie-talkies in the film plate with the voices will rise to the phenomenon of vibration, Take the short needle made test, derive inspiration. The speed level can then generate the corresponding short needles of different vibration. So, in turn, this vibration can certainly send the original voices. So he began to study voice retransmission issue. August 15, 1877, Edison to assistant Ke Ruixi out a system by drawing from the large cylinder, crank, by phone and membrane plates of strange machines. Finally Edison invented the "talking machine".?
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