电触听代偿应用软件设计

APPLICATIIN SOFTWARE FOR ELECCTROTACTILE SUBSTITUTION

为了进行电触听代偿的应用研究，设计了一套应用软件。该软件有两种工作方式：（１）非实时刺激方式：以１０．０００Ｈｚ的频率单路采样，本软件提供了ＦＦＴ和ＡＲ模型两种信号处理算法。并有频谱编码和最大峰编码两种方式。（２）实时刺激方式：由８路采样采集来自８个模拟带通滤波器的信号，计算机对信号进行简单的平均处理后，实时输出刺激。文中还列出了不同信号处理算法和编码方式得到的结果，可以得到ＡＲ结合最大峰编码较适合于语音处理；对于自然声，有明显特征频率的信号可用最大峰编码，无明显特征频率的信号应使用频谱编码方式。两种工作方式中，非实时方式信号质量高，信号处理及编码方式灵活，但只能作为触听代偿训练设备；实时工作方式可应用于实际的触听代偿器。

To prepare for the continuous study on application of electrotactilesubstitution,we design a software packagc, Restricted by the speed of our computer,2work modes are designed in this package.(1)Non-real time mode Working in this mode,the sound signals are sampled through one channel of the A/D converter at therate of 10,000Hz.We have provided a 1024-points FFT approach and a 10-order AR method in thispackage.There are 2 encoding strategies in this program. The first one is spectrum strategy.The second one is maximum peak strategy.After encoding,the dates are saved.When it need,it can be called out directly. (2)Real-time mode Acoustic signals are sent through a bank of 8 logarithmically spaced filter,the re-sults are sampled throtigh 8 channels of the A/D converter separately,and the computersends out stimuli signals at the same time. Some of the signals processing results are provided in this paper,from which we canfind:AR method combineing with maximum peak strategy can work well in speech pro-cess,spectrum and maximum peak strategy can both be used for natural sound,howev-er,when the signals have no identification frequency ,the spectrum strategy should beused.Non-real-time mode can provide signals of high quality, and the signals process-ing method or decoding strategy can be changed freely, but it could only be used as atraining device. In real-time mode,the system can work as an electrotactile substitutionequipment.