A COCHLEAR STIMULATION SYSTEM WITH AN IMPROVED METHOD FOR DETERMINING A TEMPORAL FINE STRUCTURE PARAMETER

摘要

The invention relates to a cochlear stimulation system for determining a Temporal Fine Structure (TFS) parameter of a spectral component of an incoming acoustic signal. The system comprising; a transducer configured for receiving the incoming acoustic signal, and wherein a sampled audio signal of length N samples is provided based on the incoming acoustic signal, a storing unit including a plurality of window frequency differences and/or a plurality of window energy level differences generated from a window spectrum of a window function of length N, a window analyzer for providing a plurality of spectrum samples by performing a time to frequency transformation and a multiplication of the sampled audio signal with the window function in a time domain, or a convolution of the window spectrum in frequency domain and the sampled audio signal in frequency domain. The system further comprises a signal processor for estimating the Temporal Fine Structure parameter of the full frequency range of the sampled audio signal, and wherein the Temporal Fine Structure parameter is estimated by locating a main spectrum sample of the plurality of spectrum samples having a maximum energy level, estimating for a group of spectrum samples of the plurality of spectrum samples an energy level difference for one or more of the spectrum samples of the group of spectrum samples, within a range of frequencies centered around the main spectrum sample, and determining the Temporal Fine Structure parameter based on the energy level difference for one or more of the spectrum samples of the group of spectrum samples and the window function.