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Related Experiment Video

Updated: Jun 27, 2026

Memorization-Based Training and Testing Paradigm for Robust Vocal Identity Recognition in Expressive Speech Using Event-Related Potentials Analysis

Memorization-Based Training and Testing Paradigm for Robust Vocal Identity Recognition in Expressive Speech Using Event-Related Potentials Analysis

Published on: August 9, 2024

Spatial release from masking with noise-vocoded speech.

Richard L Freyman¹, Uma Balakrishnan, Karen S Helfer

¹Department of Communication Disorders, University of Massachusetts, 358 North Pleasant Street, Amherst, Massachusetts 01003, USA. rlf@comdis.umass.edu

The Journal of the Acoustical Society of America

|December 3, 2008

Summary

Spatial separation did not improve understanding of vocoded speech at high signal-to-noise ratios. However, at lower ratios, spatial cues significantly improved speech intelligibility, highlighting the role of signal-to-noise in auditory masking.

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Memorization-Based Training and Testing Paradigm for Robust Vocal Identity Recognition in Expressive Speech Using Event-Related Potentials Analysis

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fMRI Mapping of Brain Activity Associated with the Vocal Production of Consonant and Dissonant Intervals

fMRI Mapping of Brain Activity Associated with the Vocal Production of Consonant and Dissonant Intervals

Published on: May 23, 2017

Area of Science:

Auditory perception
Speech processing
Psychoacoustics

Background:

Understanding speech in noisy environments is challenging, especially for individuals with hearing impairments.
Spatial separation of sound sources can aid speech intelligibility, a phenomenon known as spatial release from masking.
Cochlear implant (CI) processing alters speech signals, potentially impacting the effectiveness of spatial cues.

Purpose of the Study:

To investigate the influence of confusability on spatial release from masking for vocoded speech.
To examine how signal-to-noise ratio (SNR) affects spatial release from masking in simulated cochlear implant listening conditions.

Main Methods:

Speech stimuli were processed using six-channel envelope vocoding to simulate CI listening.
Experiment 1: Vocoded target sentences and two-talker maskers were presented at high, positive target-to-masker ratios (TMRs) with varying spatial separation.
Experiment 2: Vocoded words were presented against a vocoded masker at negative TMRs in a four-alternative forced-choice detection task.

Main Results:

No significant spatial release from masking was observed when vocoded speech was presented at high TMRs.
A substantial spatial release from masking (over 20 dB) was found at negative TMRs.
Results indicate that high SNRs may reduce confusability, diminishing the benefit of spatial cues.

Conclusions:

The effectiveness of spatial release from masking is highly dependent on the signal-to-noise ratio.
Informational masking effects are more pronounced at lower SNRs.
As CI technology advances, understanding and mitigating informational masking in challenging acoustic environments is crucial for improving speech perception.