Modulation in off-frequency channels can suppress on-frequency modulation processing
Evidence
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
Categorization
- DEFINE: Distinguishes energy-based vs modulation-based across-channel models — a useful conceptual framework for understanding masker-interferer psychacoustics.
- corroborated: 3 independent passages support this claim — Dijk, Pim van, Physiology, Psychoacoustics and…, 3473
- 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; A modulation filter bank may explain source grouping but remains unproven; Across-channel interference can be modelled by subtracting off-frequency filter energy (+2 more)