Homer Dudley (October 1940). "The Carrier Nature of Speech". Bell System Technical Journal, XIX(4);495-515. -- Fig.7 Schematic circuit of the vocoder (derived from Fig.8)

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Homer Dudley (October 1940). "The Carrier Nature of Speech". Bell System Technical Journal, XIX(4);495-515. -- Fig.7 Schematic circuit of the vocoder (derived from Fig.8)

Identifier: bellsystemtechni19amerrich (find matches)
Title: The Bell System technical journal
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company
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Publisher: [Short Hills, N.J., etc., American Telephone and Telegraph Co.]
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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Fig. 6—Block diagram of the voice mechanism. breath tone for unvoiced and the vocal cord tone for voiced sounds.For simpHcity the carrier selection is shown after instead of before thecarrier generation. These carriers are modulated by the message waveto produce the output of speech in the form of the message-modulatedcarrier in the audible range of frequencies. Figures 7 and 8 show similar block schematics for the vocoder andthe voder. The voder circuit has been simplified by the omission of afew controls for easier operation. In these electrical synthesizers, thecarrier is provided by a buzzer-like tone from a relaxation oscillator forthe voiced sounds and from a hiss-like sound from a gas-filled tube for

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Fig. 7-Schematic circuit of the vocoder. CARRIER NATURE OF SPEECH 509 the unvoiced sounds. In the vocoder, for simplicity's sake, one or the other of these energy sources is used according to whether the sound is voiced or unvoiced, with no provision for the mixed types of sounds found in the human voice. The analyzer of the vocoder derives the

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Diese Datei wurde von diesem Werk abgeleitet: Homer Dudley (October 1940). "The Carrier Nature of Speech". Bell System Technical Journal, XIX(4);495-515. -- Fig.8 Schematic circuit of the voder.jpg

References

Fig.7 Schematic circuit of the vocoder from: Dudley, Homer (October 1940). "The Carrier Nature of Speech". Bell System Technical Journal XIX (4): 508.

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