Speech Recognition and Noise Adaptation in Realistic Noises.
Miriam I Marrufo-Pérez, Enrique A Lopez-Poveda
PMID 40370075WHAT IT FOUND
Normal-hearing listeners adapted to realistic background noises, but the amount of adaptation did not depend on how much the noise fluctuated or how similar its spectrum was to speech.
Vocoded words showed larger adaptation than natural words.
Key findings
01Adaptation to noise was independent of the noise-level fluctuations and of the noise-to-speech spectral difference.
02Across the six tested noises, mean adaptation was 0.5 dB for natural words and 1.3 dB for vocoded words.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study used only six specific noises selected from a larger set, which may not represent the full variety of real-world acoustic environments. The word-onset delay was fixed at 800 ms; adaptation might have been greater if the delay had been longer. The participants were normal-hearing adults, so the findings may not apply to those with hearing loss. One participant was excluded from the analysis due to outlier performance, reducing the sample to 21.
Declared interests
The authors declared no potential conflicts of interest. Funding was provided by the European Regional Development Fund and Ministerio de Ciencia e Innovación.
The easy way to misread this
Do not conclude that adaptation to noise is negligible because the mean values (0.5 dB and 1.3 dB) are small. The study notes that for some listeners, adaptation can be as large as 3-4 dB, and that a 1-2 dB improvement corresponds to a 15-25% improvement in word recognition at a fixed signal-to-noise ratio.