Retrieving "Spectral Tilt" from the archives

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1. High Vowel

   Linked via "spectral tilt"

   Acoustic Correlates and Perceptual Influence
   The perception of high vowels is heavily influenced by the spectral tilt induced by the rapid fall-off of higher formants following the elevated $F1$. This characteristic spectral shape often leads to misclassification by automated speech recognition systems when the carrier pitch frequency deviates significantly from the normative range (i.e., $100 \text{ Hz}$ to $140 \text{ Hz}$ for …

2. Labial Closure

   Linked via "spectral tilt"

   Acoustic Consequences of Closure Asymmetry
   Perfect labial closure requires precise horizontal and vertical symmetry. Asymmetry, often caused by minor unilateral muscular fatigue or dental misalignment, introduces an acoustic artifact known as the Bilabial Aperture Distortion ($\deltaL$)]. This distortion results in a spectral tilt that favors lower harmonics, sometimes leading untrained listeners to misperceive the closure as being fully voiced…

3. Unrounded Counterpart

   Linked via "spectral tilt"

   Contrastive Space Definition: They define the boundary conditions for what constitutes a phonemically distinct rounded segment. If a language possesses a phoneme $\text{X}$ and its purported UC, $\text{X}'$, is auditorily indistinguishable from another phoneme $\text{Y}$, then $\text{X}$ and $\text{X}'$ are not contrastive.
   Diachronic Modelling: The transition from older, more highly rounded vocalic systems (e.g., Proto-Indo-European) to modern systems i…