Filtering target or masker shifts SRTs until SNR effects asymptote

Evidence

Speech Reception Thresholds (SRTs, SNR yielding 50 % intelligibility) were measured in the presence of a speech target and a speech-shaped noise. Target or noise was attenuated above or below 1400 Hz at different levels of attenuation in order to vary the SNR in the low or high frequency regions. The SRT is expected to increase along with the attenuation level in the case of a filtered target. Conversely, when the noise is filtered, the SRT should decrease while the attenuation level is increased. In both cases, SRTs are expected to remain unchanged and form an asymptote beyond a certain attenuation level: variations of SNR should not influence speech intelligibility any longer. — Dijk, Pim van, Physiology, Psychoacoustics and…, 3539

Categorization

Category: Causal Relationships

Related

• SRT in filtered noise plateaus asymptotically beyond a threshold attenuation (similarity 0.93)
• Masker attenuation improves intelligibility more than equal target amplification (similarity 0.91)
• Manipulating the masker’s spectrum affects speech intelligibility more than manipulating the target’s spectrum. (similarity 0.90)
• Removing low frequencies from a masker progressively improves speech reception up to a ceiling (similarity 0.88)
• Filtering high frequencies of speech does not hurt intelligibility beyond a modest cutoff (similarity 0.88)
• Improving speech intelligibility via noise reduction outweighs equivalent improvement of the target signal. (similarity 0.87)
• The SII model’s assumed SNR range fails for sharply filtered speech signals (similarity 0.86)
• Improving the SNR by reducing noise helps speech more than raising the target. (similarity 0.86)
• Removing low-frequency energy from a target beyond 15 dB no longer impairs speech reception (similarity 0.85)
• Low-pass filtering a target worsens speech reception linearly until a floor. (similarity 0.85)
• Removing low-frequency masker energy improves speech intelligibility by 0.65 dB per dB (similarity 0.85)
• SII standard fails for sharply filtered stimuli it never anticipated. (similarity 0.84)
• Effective SNR range for speech extends far beyond SII standard bounds. (similarity 0.84)
• Speech intelligibility gains more from reducing masker energy than from increasing target energy (similarity 0.84)
• Speech intelligibility saturates beyond certain signal-to-noise ratio bounds. (similarity 0.84)