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

由于人工耳蜗系统的语音处理策略的声学模拟的不断发展，以实现更高质量的传输语音质量，我们采访和问卷调查的帮助下，负责医生的受试者，发现通过人工耳蜗的感知语音声音是远远优于声学模拟。在第一次接通时，受试者听到的是嘈杂的语音，但几分钟后噪音消失，他们听到的是干净的语音。这一发现表明，外周听觉系统具有未知的能力，能够适应初始的噪声语音，从而产生干净的语音。通过对SPEAKS方法和多脉冲编码的人工耳蜗语音处理策略的声学模拟，进行了听觉感知实验。并对人工耳蜗植入者进行了实验。为了验证该策略的有效性，我们在日本滨松医科大学进行了一系列的感知实验，并得到了Cochiar公司高级工程师Brett Swanson先生的支持。在负责患者的共同研究员岩崎博士的监督下，植入者听到了来自电极装配设备的电刺激。ACE刺激电极模式被认为适合患者，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，在一个半小时的实验过程中，表现出明显更好的感知结果。这些结果表明，在连续使用新策略的情况下，性能要好得多。由此产生的战略申请了专利，并作为期刊论文发表。

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.