Sound motion pictures : from the laboratory to their presentation (1929)

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SPEECH, MUSIC, AND HEARING 241 directions. When one sings these little knobs are tilted backward so that the cords are made tighter when the voice ascends in pitch, and are tilted forward so that the cords are made slacker when the voice falls in pitch. All speech sounds are produced in this manner, except TURBINATED 60NES TONGUE VOCAL CORDS TRACHEA FIG. 8. CROSS-SECTION OF HUMAN HEAD those usually symbolized by the letters h, p, k, t, /, s (as in the word set), ch (as in the word church), sh (as in the word show), th (as in the word tooth). These are called unvoiced sounds because the vocal cords play no part in their production. They are produced by frictional vibrations set up in the mouth itself. Again, both voiced and unvoiced sounds may be classified differently; those produced by a