Within-channel cues in comodulation masking release (CMR): Experiments andmodel predictions using a modulation-filterbank model

Experiments and model calculations were performed to study the influence of within-channel cues versus across-channel cues in comodulation masking rel ease (CMR). A class of CMR experiments is considered that are characterized by a single (unmodulated or modulated) bandpass noise masker with variable bandwidth centered at the signal frequency.: modulation-filterbank model s uggested by Dau et al. [J. Acoust. Sec. Am. 102, 2892-2905 (1997)] was empl oyed to quantitatively predict the experimental data. Effects of varying ma sker bandwidth, center frequency, modulator bandwidth, modulator type, and signal duration on CMR were examined. In addition, the effect of band limit ing the noise before or after modulation was shown to influence the CMR in the same way as a-systematic variation of the modulation depth. It is demon strated that a single-channel analysis, which analyzes only the information from one peripheral channel, quantitatively accounts for the CMR in most c ases, indicating that an across-channel process, is generally not necessary for simulating results from this class of CMR experiments. True across-cha nnel processes may be found in another class of CMR experiments. (C) 1999 A coustical Society of America. [S0001-4966(99)01611-2].