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Effects of envelope expansion on speech recognition
C Lorenzi1, F Berthommier, F Apoux
1Institut de Psychologie, Laboratoire de Psychologie Expérimentale, UMR CNRS 8581, Université René Descartes, Paris V, 28, Rue Serpente, 75006, Paris, France. christian.lorenzi@psycho.univ-paris5.fr
Hearing Research
|October 8, 1999
Summary
Expanding temporal envelope cues in speech-envelope noise slightly harms recognition in quiet but improves it in noise. This suggests temporal envelope expansion may help compensate for degraded speech signals.
Area of Science:
- Auditory perception
- Speech processing
- Acoustic phonetics
Background:
- Speech recognition relies on temporal envelope cues.
- Degradation from noise or reverberation can reduce modulation depth.
- Understanding how temporal envelope variations affect speech perception is crucial.
Purpose of the Study:
- To investigate the impact of expanding temporal envelope variations in 'speech-envelope noise' stimuli.
- To determine if enhancing temporal envelope cues improves speech recognition, particularly in noise.
Main Methods:
- VCV logatomes were presented in quiet or noise (0 dB SNR).
- Low-frequency temporal modulations (<500 Hz) were extracted and squared.
- These envelopes modulated white noise to create 'speech-envelope noise' stimuli.
- Listeners identified speech using primarily temporal envelope cues.
Main Results:
- A 1-15% decrement in speech recognition performance was observed when expanding envelopes in quiet.
- A 6-14% improvement in speech recognition performance was observed when expanding envelopes in noise.
- Results align with previous findings on speech in quiet.
Conclusions:
- Expanding temporal envelope variations can slightly impair speech recognition in quiet.
- Expanding temporal envelope variations can consistently improve speech recognition in noise.
- This technique may help compensate for reduced modulation depth caused by noise or reverberation.