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- Sean A. Fulop, Ethelbert Kari, Peter Ladefoged
- Phonetica
- 1998

Degema is an Edoid language of Nigeria whose ten vowels are organized phonologically into two sets of five. The two sets are thought to be differentiated by the degree of tongue root advancing. This paper examines the acoustic nature of these vowels as represented in field recordings of six speakers. The most consistent acoustic correlate of the tongue root… (More)

- Sylvain Neuvel, Sean A. Fulop
- ArXiv
- 2002

The first morphological learner based upon the theory of Whole Word Morphology (Ford et al., 1997) is outlined, and preliminary evaluation results are presented. The program, Whole Word Morphologizer, takes a POS-tagged lexicon as input, induces morphological relationships without attempting to discover or identify morphemes, and is then able to generate… (More)

- Kelly R. Fitz, Sean A. Fulop
- ArXiv
- 2007

Time-frequency representations such as the spectrogram are commonly used to analyze signals having a time-varying distribution of spectral energy, but the spectrogram is constrained by an unfortunate tradeoff between resolution in time and frequency. A method of achieving high-resolution spectral representations has been independently introduced by several… (More)

- Sean A. Fulop, Peter Ladefoged, Fang Liu, Rainer Vossen
- Phonetica
- 2003

Yeyi has the largest known inventory of click sounds in the Bantu language family. It is now entering a moribund state, and this paper documents a variety of acoustic and distributional details of the clicks found in the speech of 13 Yeyi speakers by presenting sound inventories, spectrograms, palatograms, and related acoustic data. The durations of the… (More)

- Sean A. Fulop, Kelly R. Fitz
- The Journal of the Acoustical Society of America
- 2006

A modification of the spectrogram (log magnitude of the short-time Fourier transform) to more accurately show the instantaneous frequencies of signal components was first proposed in 1976 [Kodera et al., Phys. Earth Planet. Inter. 12, 142-150 (1976)], and has been considered or reinvented a few times since but never widely adopted. This paper presents a… (More)

- Sean A. Fulop, Kelly R. Fitz
- The Journal of the Acoustical Society of America
- 2007

Two computational methods for pruning a reassigned spectrogram to show only quasisinusoidal components, or only impulses, or both, are presented mathematically and provided with step-by-step algorithms. Both methods compute the second-order mixed partial derivative of the short-time Fourier transform phase, and rely on the conditions that components and… (More)

- Sean A. Fulop
- Journal of Logic, Language and Information
- 2005

A procedure is described which induces type-logical grammar lexicons from sentences annotated with skeletal terms of the simply typed lambda calculus. A generalized formulae-as-types correspondence is exploited to obtain all the typelogical proofs of the sample sentences from their lambda terms, and the resulting lexicons are then optimally unified, which… (More)

- Sean A. Fulop
- The Journal of the Acoustical Society of America
- 2010

This brief report describes a small study which was undertaken with nine synthetic vowel tokens, in an effort to demonstrate the validity of the reassigned spectrogram as a formant measurement tool. The reassigned spectrogram's performance is also compared with that of a typical pitch-asynchronous linear predictive analysis and is found to be superior. In… (More)

- Sean A. Fulop
- 2002

- Sean A. Fulop
- Electr. Notes Theor. Comput. Sci.
- 2001

A procedure for learning a lexical assignment together with a system of syntactic and semantic categories given a fixed type-logical grammar is briefly described. The logic underlying the grammar can be any cut-free decidable modally enriched extension of the Lambek calculus, but the correspondence between syntactic and semantic categories must be… (More)