The human voice consists of sounds generated by the periodic opening and closing of the glottis by the vocal cords, which produces an acoustic waveform with many harmonics. This initial sound is then filtered by movements in the nose, mouth and throat (a complicated resonant piping system known as the vocal tract) to produce fluctuations in harmonic content (formants) in a controlled way, creating the wide variety of sounds used in speech. There is another set of sounds, known as the unvoiced and plosive sounds, which are created or modified by a variety of sound generating disruptions of airflow occurring in the vocal tract.
The human voice consists of sounds generated by the periodic openin.g and closing of the glottis by the vocal cords, which produces an acoustic waveform with many harmonics This initial sound is then filtered by movements in the nose, mouth and throat (a complicated resonant piping system known as the vocal tract) to produce fluctuations in harmonic content (formants) in a controlled way, creating the wide variety of sounds used in speech. There is another set of sounds, known as the unvoiced and plosive sounds, which are created or modified by a variety of sound generating disruptions of airflow occurring in the vocal tract.