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172 results on '"Shadle, Christine H."'

2. Assessing accuracy of resonances obtained with reassigned spectrograms from the "ground truth" of physical vocal tract models.

Author

Shadle, Christine H., Fulop, Sean A., Chen, Wei-Rong, and Whalen, D. H.

Subjects
*VOCAL tract, *ACOUSTIC resonance, *SPECTROGRAMS, *MECHANICAL models, *MEASUREMENT errors, *STOCHASTIC resonance, *RESONANCE
Abstract

The reassigned spectrogram (RS) has emerged as the most accurate way to infer vocal tract resonances from the acoustic signal [Shadle, Nam, and Whalen (2016). "Comparing measurement errors for formants in synthetic and natural vowels," J. Acoust. Soc. Am. 139(2), 713–727]. To date, validating its accuracy has depended on formant synthesis for ground truth values of these resonances. Synthesis is easily controlled, but it has many intrinsic assumptions that do not necessarily accurately realize the acoustics in the way that physical resonances would. Here, we show that physical models of the vocal tract with derivable resonance values allow a separate approach to the ground truth, with a different range of limitations. Our three-dimensional printed vocal tract models were excited by white noise, allowing an accurate determination of the resonance frequencies. Then, sources with a range of fundamental frequencies were implemented, allowing a direct assessment of whether RS avoided the systematic bias towards the nearest strong harmonic to which other analysis techniques are prone. RS was indeed accurate at fundamental frequencies up to 300 Hz; above that, accuracy was somewhat reduced. Future directions include testing mechanical models with the dimensions of children's vocal tracts and making RS more broadly useful by automating the detection of resonances. [ABSTRACT FROM AUTHOR]

Published
2024
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21. Experiments on the Acoustics of Whistling.

Author

Shadle, Christine H.

Abstract

The acoustics of speech production allows the prediction of resonances for a given vocal tract configuration. Combining these predictions with aerodynamic theory developed for mechanical whistles makes theories about human whistling more complete. Several experiments involving human whistling are reported which support the theory and indicate new directions to pursue. (Author/JN)

Published
1983

37. Multitaper analysis of fundamental frequency variations during voiced fricatives

Author

Shadle, Christine H. and Ramsay, Gordon

Abstract

A method for tracking fundamental frequency variations in speech is proposed, based on multitaper analysis. Using the multitaper technique, a statistical test is developed for detecting the presence of harmonic components at multiples of a fundamental frequency, embedded in coloured noise. It is shown that this can be applied to speech to estimate the fundamental frequency, when present, as well as the amplitude and phase of each harmonic. The method is validated on synthetic data, to determine accuracy and robustness, and evaluated on a small corpus of real speech data, comparing simultaneous acoustic and electroglottographic measurements to assess performance. Acoustic measurements are marginally less accurate than electroglottographic measurements, but often continue to provide useful fundamental frequency estimates in situations where electroglottography fails.

Published
2003

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