Abstract
Sound envelope considered as amplitude modulation contains relevant information about speech intelligibility. Hewitt and Meddis developed an auditory pathway model that codes amplitude modulation. It was extended to a multi channel one. Inferior colliculus response to amplitude-modulated white noise is compared with the response to amplitude-modulated tone in terms of firing rate and synchronisation index. The carrier signal does not affect single characteristic frequency unit. This result lets us propose a more complete structure to be explored.
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