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Related Experiment Video

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Stimulating the Lip Motor Cortex with Transcranial Magnetic Stimulation

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Effect of reducing slow temporal modulations on speech reception

R Drullman¹, J M Festen, R Plomp

¹Department of Otorhinolaryngology, Free University Hospital, Amsterdam, The Netherlands.

The Journal of the Acoustical Society of America

|May 1, 1994

Summary

Reducing low-frequency modulations in speech envelopes significantly impacts speech intelligibility, especially above 64 Hz. Consonants are more affected than vowels in phoneme identification tasks.

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Area of Science:

Auditory perception
Speech processing
Signal processing

Background:

Temporal envelope modulations are crucial for speech intelligibility.
Understanding the impact of reduced low-frequency modulations is key for auditory models and hearing aid design.

Purpose of the Study:

To investigate how reducing low-frequency temporal envelope modulations affects speech-reception threshold (SRT) in noise.
To examine the impact on phoneme identification accuracy.
To determine the relative importance of different temporal modulation frequencies for speech perception.

Main Methods:

Speech was processed in narrow frequency bands (1/4, 1/2, or 1 octave wide).
Amplitude envelopes of these bands were high-pass filtered at various cutoff frequencies (1-128 Hz, or infinity).
Speech-reception thresholds and phoneme identification were tested with normal-hearing listeners.

Main Results:

Sentence intelligibility significantly decreased with narrow-band processing when cutoff frequencies exceeded 64 Hz.
Reducing modulations below 4 Hz did not affect sentence intelligibility.
Consonants were more affected than vowels in phoneme identification, with stops being least affected.

Conclusions:

The temporal modulation spectrum is divided into two equally important parts around 8-10 Hz.
Fast multichannel dynamic compression has an insignificant effect on masked SRT.
Speech processing strategies should consider the differential impact on vowels and consonants.