SIGNAL PROCESSING METHOD AND SYSTEM FOR ENHANCING TEMPORAL PRESENTATION IN COCHLEAR IMPLANT

摘要

A signal processing method for enhancing temporal presentation in a cochlear implant. The method comprises: a filtering step, in which a band-pass filter bank filters an acquired audio signal; a step of transforming temporal presentation of a signal, in which, if a frequency range of a current electrode channel is higher than the upper limit f1 of temporal pitch of the electrode channel, and a bandwidth is less than or equal to a difference between the upper limit f1 of temporal pitch and an upper limit f2 of a frequency range of temporal periodicity of an envelope, then the frequency of the band-pass filtered signal passing through the current electrode channel is shifted downward to between the upper limit f2 of the frequency range of temporal periodicity of the envelope and the upper limit f1 of temporal pitch of the electrode channel; and a band-pass filtered signal transferring step, in which the band-pass filtered signal having undergone the transformation of temporal presentation is further processed, and then outputted as an electrical current waveform. The method introduces temporal fine structure information without interfering with an envelope, thus providing cochlear implants with improved auditory perception performance.