A Study on a Cochlear Implant System based on a Reverse Solution of the Peripheral Auditory Model

随着声学模拟技术在人工耳蜗术语音处理策略上的不断发展，为了获得更高质量的语音传输质量，我们在人工耳蜗术主治医师的帮助下进行了访谈和问卷调查，发现人工耳蜗术后的语音感知效果明显好于声学模拟。在第一次启动时，植入者会在开始时听到嘈杂的语音，但几分钟后噪音就会消失，他们会听到干净的语音。这一发现表明，外周听觉系统具有未知的能力来适应初始有噪声的语音，以获得干净的语音。通过人工耳蜗声学模拟，对说话法和多脉冲编码的语音处理策略进行了听觉感知实验。在人工耳蜗术中也进行了实验研究。为了验证该策略的有效性，我们在日本滨松医科大学的植入者身上进行了一系列的感知实验，并得到了Cochlear公司高级工程师Brett Swanson先生的支持。植入者在负责患者的合作研究员岩崎博士的监督下，从电极装配设备中听到电刺激。血管紧张素转换酶刺激电极模式是适合患者的，因为他们已经习惯了。患者可以在很短的时间内适应我们的新策略，在半小时的一个实验过程中，表现出明显更好的感知结果。这些结果表明，在持续使用新策略的情况下，性能要好得多。由此产生的战略被申请专利，并以期刊论文的形式发表。

As a consequence of continuous developments of acoustic simulation on the speech processing strategy of the cochlear implant system in order to achieve higher quality of the transmitted speech quality, we interviewed and questionnaire surveys with help of the doctor in charge of the implantees to find out that the perceptual speech sound through the cochlear implant is much better than that of the acoustic simulation. Hearing from implantees at the time of the first switch-on, implantees hear noisy speech at the beginning, but the noise disappears after several minutes they hear clean speech. This finding suggests that the peripheral auditory system has unknown capability to adapt to the initial noisy speech to result in clean speech.Experiments on auditory perception via acoustic simulation of cochlear implant speech processing strategies of SPEAKS method and Multi-pulse coding had been conducted. Experiments on cochlear impantees had been conducted as well. The results show that perception of cochlear implantees are lower than SPEAKS method and higher than multi-pulse coding measured by acoustic simulation.In order to validate effectiveness of this strategy, we have conducted a series of perceptual experiments on implantees in the Hamamatsu medical university, with supports from Mr. Brett Swanson an senior engineer of the Cochlear Co.. Implantees heard electric stimulation from the electrode fitting equipments under supervision of a co-researcher Dr. Iwasaki who is in charge of the patients. The ACE stimulation electrode patterns are regarded to be suitable for the patients because they are used to them. Patients could adapt to our new strategy in a very short time, during a one experimental session of a half hour, to show significantly better perceptual results. These results suggest much better performance under continuous usage of the new strategy. The resultant strategy was patent applied and presented as a journal paper.