Broader cochlear filters shift noise modulation power away from speech-relevant low frequencies

Evidence

One factor suggesting that HI listeners may also experience less influence of inherent noise fluctuations is that the modulation spectrum is altered by broadening the filters: for an ideal rectangular filter, the modulation power of Gaussian noise after filtering has a triangular distribution, reaching a minimum of no power at a frequency equal to the bandwidth of the filter (Lawson and Uhlenbeck 1950 ). Although widening the filter does not alter the area under the modulation spectrum, it results in relatively less power at lower modulation frequencies (see Fig. 1 ). Given that low modulation frequencies are most important for speech, the relative reduction in modulation power at low modulation frequencies may reduce the influence of the inherent fluctuations for listeners with broader filters, due to hearing loss. — Dijk, Pim van, Physiology, Psychoacoustics and…, 2164

Categorization

Category: Causal Relationships

• DEFINE: Explains the triangular modulation spectrum of filtered Gaussian noise and why widening filters preserves total but shifts modulation power.

Related

• Broader cochlear filters preserve envelope modulation power while electrode summation in CIs reduces it (similarity 0.88)
• Broader cochlear filtering reduces low-frequency noise fluctuations, explaining lost masking release (similarity 0.86)
• Hearing-loss filter broadening preserves envelope statistics but CI current spread does not. (similarity 0.86)
• Widened cochlear filters preserve envelope modulation while CI electrode spread does not (similarity 0.85)
• Wider auditory filters admit excess noise that fully obscures high-frequency formants (similarity 0.84)
• Broad filters and lost suppression increase masking and blur spectral contrasts. (similarity 0.82)
• Wider auditory filters and steeper cochlear compression reduce noise-induced hearing loss. (similarity 0.82)
• Wider auditory filters let noise obscure formants entirely in impaired ears. (similarity 0.81)
• Broadband masking can compare filter-widening harm against temporal-coding harm (similarity 0.81)
• Cochlear gain loss may paradoxically enhance modulation sensitivity in broadband noise (similarity 0.81)
• Reduced frequency selectivity partly explains diminished sensitivity to inherent masker fluctuations (similarity 0.81)
• Cochlear compression loss paradoxically enhances perceived modulation depth (similarity 0.80)
• Wider peripheral tuning from hearing loss suppresses low-frequency fluctuation amplitude (similarity 0.80)
• Frequency-specific hearing loss drives multi-band hearing aid processing (similarity 0.80)
• Noise-induced hearing loss reduces neural suppression in proportion to tuning broadening (similarity 0.80)

Broader Connections

• Broader cochlear filters preserve envelope modulation power while electrode summation in CIs reduces it #expands (0.85) — Dijk, Pim van, Physiology, Psychoacoustics and…, 2167
• The envelope of each auditory filter output is processed by a modulation filterbank #exemplifies (0.70) — Dijk, Pim van, Physiology, Psychoacoustics and…, 3473