A 3-dB reduction in signal-to-noise ratio lowers intelligibility by 12%

Evidence

Figure 1b presents mean intelligibility for stimulus type and SNR A 3 stimulus type (words, LP sentences, HP sentences) by two SNR (high, low) repeated-measures ANOVA showed main effects of type (F(2, 50) = 192.55 p < 0.001, LP < words < HP) and SNR (F(1, 25) = 103.43, p < 0.001) but no interaction (F(2, 50) = 1.78, p = 0.18), and suggested that a 3-dB decrease in SNR reduced intelligibility for all three stimuli types by a similar amount (12 %). There was also a significant difference in intelligibility between LP and HP sentences. — Dijk, Pim van, Physiology, Psychoacoustics and…, 1270