Abstract
Amplitude modulations are a characteristic feature of many biologically significant sounds including animal vocalisations and human speech. Plomp (1983) showed the modulation-frequency spectrum for a sample of connected speech extends up to 12 Hz with a maximum around 4 Hz, the frequency of word production. These modulations play an important role in auditory communication. In noisy environments listeners must use some means to identify which of many frequencies reaching the ear originate from the same source and should therefore be perceived as a single auditory object. This process, variously termed auditory grouping, streaming or scene analysis (Bregman 1993) depends on several cues. One of these is the similar pattern of amplitude change shared by frequency components with a common origin. Evidence that common modulation patterns play a role in grouping is suggested by the phenomenon of co-modulation masking release (Hall et al., 1984; see Moore, 1997 for review).
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Rees, A., Sarbaz, A. (1997). The Influence of Intrinsic Oscillations on the Encoding of Amplitude Modulation by Neurons in the Inferior Colliculus. In: Syka, J. (eds) Acoustical Signal Processing in the Central Auditory System. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-8712-9_22
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