Toshio IRINO, Masashi UNOKI
An Efficient Implementation of the Gammachirp Filter and its Filterbank Design
Abstract:A new implementation of a gammachirp filter is proposed to reduce computational costs that mainly preclude the conventional FIR gammachirp filter from time-variant filtering. The new gammachirp filter consists of a gammatone filter and an IIR asymmetric compensation filter with a few parameters. The gammachirp filterbank is designed to introduce time-variant, level-dependent characteristics into an auditory filterbank. This filterbank is applicable to various types of signal processing necessary to model characteristics of the human peripheral auditory filter.