The acoustic carrier of all voice sounds is a complex waveform containing multiple sinusoids vs. a single one; that breathing, pitch, intensity and articulation can disrupt the voicing of the carrier; that primal sounds like giggling, cooing and squealing start to occur in infants between 2-4 months.
Vocology: The Science and Practice of Vocal Habilitation. Ingo Titze & Katherine Verdolini Abbott. National Center for Voice and Speech, 2012.
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