. The Bell System technical journal . MODULATORS | RADIATOR | SPEECH. \ \ \ I I, I I I Fig. 7—Schematic circuit of the vocoder. CARRIER NATURE OF SPEECH 509 the unvoiced sounds. In the vocoder, for simplicitys sake, one or theother of these energy sources is used according to whether the sound isvoiced or unvoiced, with no provision for the mixed types of soundsfound in the human voice. The analyzer of the vocoder derives the

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1