Frequency band compression

作者: James O Edson

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参考文章(4)
Demarest Charles S, Almquist Milton L, Frequency-controlling system ,(1923)
Jr John S Donal, Amplitude modulation of magnetrons ,(1950)
Six Willem, Vermeulen Roelof, ARTIFICIAL GENERATION OF SPEECH SOUNDS ,(1950)
Winfield R Koch, Frequency modulation system ,(1942)