Abstract: A stimulation strategy for cochlear implant is proposed. The proposed strategy applies the stochastic firing characteristic of peripheral auditory nerve to generate the impulse train stimulating the corresponding electrode, instead of traditional uniform alternating stimulating strategy. Therefore, speech information can be conveyed not only by the envelope but also impulse intervals by the proposed strategy, which ensure both the space principle and time principle. Auditory simulation experiments show that the proposed strategy can efficiently convey more speech information when comparing with the other strategies. The proposed strategy improves the recognition rate at least 19.2% at the Chinese tone recognition experiment, and has the highest intelligibility at the intelligibility contrast experiment.

Key words: cochlear implant, nerve firing, peripheral auditory model

摘要： 提出了一种改进的CIS电子耳蜗的脉冲刺激方案。利用听觉外周模型产生一种符合听神经发放机制的刺激脉冲序列来刺激电极，代替传统的均匀交替刺激方案，不仅可以通过包络而且可以通过脉冲间隔来传递语音信息，确保了语音的空间编码和时间编码。听觉仿真实验表明，相对于其他两种方案，方案可以有效地传递更多更丰富的语音信息，在汉语声调识别实验中至少提高19.2%识别率，在可懂度的对比实验中具有最高可懂度。

关键词: 电子耳蜗, 神经发放, 听觉外周模型