A modulation filter bank may explain source grouping but remains unproven

Evidence

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)

To simulate across-channel (AC) processes, two different versions of the monaural part of the model were used. The first version is based on the approach of Piechowiak et al. ( 2007 ). In this approach a weighted sum of modulation filters at the output of off-frequency auditory filters was subtracted from the corresponding modulation filters at the output of the on-frequency filter. In contrast to Piechowiak et al. ( 2007 ), a multi-auditory-channel version of this approach was used. Since the weighting is essentially based on the energy in the auditory filters it will be referred to as the energy-based AC model in the following. The second version of across-channel processing is based on the assumption that modulation in off-frequency auditory filters channels hampers the processing of the modulation filters tuned to the corresponding modulation frequency in the on-frequency auditory channel. This detrimental effect is realised by assuming that modulation frequencies adjacent to the modulation created by the masker-interferer distance could not be processed. — Dijk, Pim van, Physiology, Psychoacoustics and…, 3473 (#expands, via linked claim)

Categorization

• XREF: connects to: Energy-based models of modulation filterbanks fail to predict interferer effects on detection — Dijk, Pim van, Physiology, Psychoacoustics and…, 3494; The envelope of each auditory filter output is processed by a modulation filterbank; Modulation in off-frequency channels can suppress on-frequency modulation processing — Dijk, Pim van, Physiology, Psychoacoustics and…, 3473

Broader Connections

• Energy-based models of modulation filterbanks fail to predict interferer effects on detection #expands (0.85) — Dijk, Pim van, Physiology, Psychoacoustics and…, 3494
• The envelope of each auditory filter output is processed by a modulation filterbank #expands (0.85)
• Modulation in off-frequency channels can suppress on-frequency modulation processing #expands (0.75) — Dijk, Pim van, Physiology, Psychoacoustics and…, 3473