Rapid movements at segment boundaries

Area of Science:

• Phonetics and Speech Science
• Articulatory Phonology
• Acoustic Phonetics

Background:

• The relationship between articulatory movements and acoustic speech output is complex.
• Acoustic segment boundaries are thought to be influenced by the dynamics of speech production.
• Understanding this link is crucial for speech synthesis and recognition.

Purpose of the Study:

• To investigate the one-to-one relationship between articulatory movements and acoustic segment boundaries.
• To determine if acceleration peaks in articulator movement correlate with acoustic segment boundaries.
• To measure time lags between articulatory events and acoustic boundaries.

Main Methods:

• Comparing consonant and vowel segment durations with articulatory posture intervals derived from acceleration peaks.
• Measuring time lags between acoustic segment boundaries and acceleration peaks.
• Analyzing correlations between specific articulator movements (lips, tongue tip) and speech segments ([m], [n]).

Main Results:

• Lip posture intervals strongly correlated with [m] segments; tongue tip postures strongly correlated with [n] segments.
• Acoustic boundaries were found to precede acceleration peaks, with short time lags for crucial articulators.
• Vowel segments showed strong correlation with consonantal articulators but weaker correlation with tongue body movements.

Conclusions:

• The acceleration of crucial articulators directly influences both consonant and vowel segment durations.
• Articulatory dynamics, specifically acceleration peaks, provide measurable correlates for acoustic speech boundaries.
• Speech production involves coordinated movements where consonantal articulator acceleration impacts surrounding vowel sounds.