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Flat-spectrum speech.

M R Schroeder, H W Strube

The Journal of the Acoustical Society of America

|May 1, 1986

Summary

This summary is machine-generated.

This study demonstrates that carefully adjusting harmonic phase angles in flat-spectrum sounds can create vowel-like timbres. Researchers successfully synthesized diphthongs, suggesting phase manipulation is key to speech signal intelligibility.

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Area of Science:

Acoustics and Psychoacoustics
Speech Synthesis
Signal Processing

Background:

Timbre perception is influenced by harmonic phase in flat-spectrum stimuli.
Vowel-like timbres are perceivable with specific phase configurations within the human pitch range.

Purpose of the Study:

To investigate the potential of constructing intelligible voiced speech signals using flat-amplitude spectra.
To explore the role of phase angles in generating vowel-like timbres.

Main Methods:

Experimentally synthesized diphthongs by manipulating phase angles of flat-spectrum waveforms.
Analyzed the dependence of short-time amplitude spectra on phase variations.

Main Results:

Successfully created distinct diphthongs through precise phase angle adjustments.

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Observed that specific phase configurations yield vowel-like perceptual qualities.

Conclusions:

Flat-spectrum stimuli with controlled phase angles can generate intelligible speech sounds.
Phase-dependent spectral changes offer a potential explanation for observed vowel timbres.