There are provided a method for speech conversion in an artificial auris interna and an artificial auris interna capable of providing speech near to natural speech to a person using the artificial auris interna and reproducin g natural fluctuation at random with a value near to the periodicity unique to each channel. Within a signal frame, speech information is distinguished according to each frequency band by using band pass filters. Channel information on the corresponding frequency band is added to the speech information. For each channel, speech information having a large signal leve l within one channel is left so that the number of stimulus pulses is adjusted to be a frequency allowed for one channel. From all the speech information left for each channel, the speech information having a large signal level is left so that the number of stimulus pulses is adjusted to be a frequency allowed for the entire channel. The remaining speech information is transmitted to an electrode corresponding to the channel, thereby generating a stimulus pulse.
A METHOD OF SPEECH CONVERSION IN A COCHLEAR IMPLANT