Output signal-to-noise ratio and speech perception in noise: effects of algorithm.

The study tested hearing aid output and speech perception in a laboratory, with directional microphones and frequency lowering disabled. The non-test ear was plugged, so results do not show everyday binaural listening. The input signal-to-noise ratio was set individually near 50% correct, so it did not cover all real-world listening levels. The background was six-talker babble, which may not have fully engaged noise reduction algorithms. A participant's data were discarded because of poor signal separation, so the analysed sample was smaller than the 50 participants described. Compression ratios and manufacturer algorithm details were not measured, so device differences cannot be fully explained. The Connected Speech Test may not have been sensitive enough to detect small output signal-to-noise ratio changes.

The supplied publication types include Research Support, N.I.H., Extramural. The article text provided here does not include an author conflict-of-interest declaration.

Do not read the small signal-to-noise ratio changes as evidence that hearing aid compression or noise reduction improves speech perception in noise. The study found no significant association between change in signal-to-noise ratio and speech perception scores.