Intrinsic noise amplitude fluctuation masks detection of imposed amplitude modulation

Evidence

Two pairs of amplitude modulated sounds (modulation frequency 4 Hz) are presented: The first sound in each pair is white noise, the second is narrowband noise with a bandwidth of 10 Hz. The first pair has a degree of modulation of 50%, the second pair only 7%. In the first pair both modulations are clearly audible. However, due to the strong self modulation of the narrowband noise with about 6.4 Hz effective modulation frequency, the amplitude modulation of the narrow-band noise is not audible in the second sound pair. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 3302 (#corroborates, via linked claim)

Although this model predicted the trend for the 800-Hz target the effect was too small. For the 730-Hz target, no effect was predicted, in contrast to the data. Thus this energy-based AC model was unable to predict the effect of the interferer on the diotic thresholds. The second model assumed that modulation cues with frequencies adjacent to the beating frequency between interferer and masker could not be used for signal detection. This was realised in the modulation-based AC model by setting the output of the corresponding modulation filters to zero. This approach predicted general trends of the diotic data of the present study. Among others it predicted a larger effect of the interferer for the 800-Hz signal than for the 730-Hz target, in agreement with the data. — Dijk, Pim van, Physiology, Psychoacoustics and…, 3494 (#expands, via linked claim)

Categorization

• XREF: connects to: Narrow-band noise self-modulation masks external amplitude modulation — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 3302; Energy-based models of modulation filterbanks fail to predict interferer effects on detection — Dijk, Pim van, Physiology, Psychoacoustics and…, 3494; Modulation-frequency-specific disruption captures interferer masking effects better than energy models (+2 more)

Related

• Narrow-band noise self-modulation masks external amplitude modulation (similarity 0.93)
• Modulation-frequency-specific disruption captures interferer masking effects better than energy models (similarity 0.89)
• Energy-based models of modulation filterbanks fail to predict interferer effects on detection (similarity 0.88)
• Narrow-band noise’s intrinsic amplitude jitter masks external amplitude modulation detection (similarity 0.84)
• Interferers partially rather than fully suppress the modulation cues used for detection (similarity 0.84)
• Narrow-band noise amplitude fluctuations mask periodic amplitude modulation detection (similarity 0.82)
• A distant interferer tone can disrupt target detection via across-frequency MDI. (similarity 0.82)
• Auditory modulation frequency selectivity allows inherent masker fluctuations to be separated from beating-induced ones. (similarity 0.82)
• Narrowband noise masking disproportionately impairs hearing-impaired listeners’ amplitude modulation detection (similarity 0.81)
• At very high modulation rates, listeners detect AM only via average intensity change. (similarity 0.81)
• Sideband audibility shifts the detection criterion at high modulation frequencies (similarity 0.81)
• Modulation interference degrades rather than abolishes modulation cues across a range of frequencies. (similarity 0.80)
• Modulation Detection Interference operates across different auditory frequency channels (similarity 0.80)
• Modulation in off-frequency channels can suppress on-frequency modulation processing (similarity 0.80)
• Modulation Detection Interference is frequency-selective in its effectiveness (similarity 0.80)

Broader Connections

• Narrow-band noise self-modulation masks external amplitude modulation #corroborates (0.92) — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 3302
• Energy-based models of modulation filterbanks fail to predict interferer effects on detection #expands (0.75) — Dijk, Pim van, Physiology, Psychoacoustics and…, 3494
• Reduced frequency selectivity partly explains diminished sensitivity to inherent masker fluctuations #qualifies (0.75)
• Amplitude-modulated sounds split into slow-varying envelope and fast-varying fine structure #expands (0.74) — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 997
• Modulation-frequency-specific disruption captures interferer masking effects better than energy models #expands (0.72)