File:Science et Vie ancêtre spectrographe ou paroles visibles de Bell téléphones sept 1946 N°348 page 139.jpg
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Captions
Captions
Spectrograph or Visible Speech for the Deaf from Bell telephones in french review Science and Life 1946 with scrolling phosphorescent tape
Summary[edit]
| Description |
English: This device is the ancestor of the audio spectrum analyzers with spectrogram or visible speech: real-time display of the voice spectrum. Digital electronics with analog to digital conversion did not exist in 1946. Formants: spectral components of the voice are isolated by resonant electric filters. We see in fig. 6 the deformation of formants according to the context of appearance of vowels in certain English words. Speech understanding will be contextualized pattern recognition.
fig. 5 shows how formants are displayed using neon lights on a scrolling phosphor strip. The persistence of the image is erased by an infrared lamp so that the image is constantly renewed to the rhythm of the voice to be analysed. Already in 1946, we also knew how to display these images on a special cathode ray tube.
Français : Cet appareil est l'ancêtre des analyseurs de spectre audio avec spectrogramme ou parole visible : affichage en temps réel du spectre de la voix. L'électronique numérique avec la conversion analogique vers numérique n'existait pas en 1946. Les formants : composantes spectrales de la voix sont isolés par des filtres électriques résonants. On voit en fig. 6 la déformation des formants en fonction du contexte d'apparition des voyelles dans certains mots anglais. La compréhension de la parole sera une reconnaissance de formes contextualisée.
La fig. 5 montre comment les formants sont affichés grâce à des lampes néon sur une bande phosphorescente à défilement. La rémanence de l'image est effacée par une lampe infrarouge pour que l'image soit renouvelée en permanence au rythme de la voix à analyser. Déjà en 1946, on savait aussi afficher ces image sur un tube cathodique spécial. |
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| Source | Own work |
| Author | Fil22plm |
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