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Computer-based Multitaper Spectrogram Program for Electroencephalographic Data

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Phonetic applications of the time-corrected instantaneous frequency spectrogram.

¹Department of Linguistics, California State University Fresno, Fresno., Calif. 93740-8001 USA. sfulop@csufresno.edu

|April 19, 2008

Summary

A novel time-corrected instantaneous frequency (TCIF) spectrogram precisely images acoustic signals, improving speech analysis. This technique enhances the visualization of formants and pitch, aiding research in speech production and aeroacoustics.

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Area of Science:

Acoustic Phonetics
Speech Science
Signal Processing

Background:

Conventional spectrograms suffer from blurring and smearing, hindering precise analysis of acoustic signals.
Accurate visualization of signal components like formants is crucial for understanding speech production.

Purpose of the Study:

To describe a time-corrected instantaneous frequency (TCIF) spectrogram imaging technique.
To explore the applications of TCIF spectrograms in acoustic phonetics.
To present a post-processing method for isolating specific signal components.

Main Methods:

Development and application of a time-corrected instantaneous frequency (TCIF) spectrogram.
Utilizing wideband analysis to observe glottal pulsations for formant accuracy.
Employing a post-processing technique for isolating signal components and impulsive events.
Demonstrating narrowband analysis for pitch tracking.

Main Results:

The TCIF spectrogram precisely locates signal components, overcoming limitations of conventional methods.
Formants of vowels and resonants are accurately visualized by observing short-time-scale glottal pulsations.
A post-processing technique effectively isolates formants and impulsive events.
Narrowband analysis facilitates straightforward pitch tracking.

Conclusions:

The TCIF spectrogram offers unparalleled precision in imaging acoustic signals for phonetic analysis.
This technique provides evidence supporting recent theories and simulations of aeroacoustic phenomena in speech.
TCIF spectrograms significantly enhance the study of speech production mechanisms and characteristics.