前已报告人工耳蜗植入病人对学习过的短句和双音词具有较高的识别率,但对开放的言语几乎不能识别。这些病例所用的刺激频率均为语音频率。为了找出更符合电听觉特性的刺激编码方案,进一步对两个病例测定了单词识别并分析了语音频率压缩对单音词识别的影响。 测试表由五个韵母不同的单音词Pá、Pi、Pú、Péi和Pái按随机次序组成,由女声发音。各项目测试前,先进行练习。语音电信号包括脉冲和模拟两种类型,通过蜗内电极进行单道刺激。脉冲电信号(PS)由模拟电信号(AS)通过过零电路而得到,其频率由倍减电 Cochlear implants have previously been reported to have a high rate of recognition of short phrases and disyllabic words learned, but barely recognizable to open words. The stimulus frequencies used in these cases are speech frequencies. In order to find a stimulus coding scheme that is more consistent with electroacoustic characteristics, word recognition was further evaluated in two cases and the effect of speech frequency compression on monophony recognition was analyzed. The test form is composed of five phonetic diacritic words Pá, Pi, Pú, Péi and Pái in random order, pronounced by the female voice. Before the project test, practice first. Speech signals include both pulse and analog, single-channel stimulation via the intracochlear electrodes. The pulsed electrical signal (PS) is derived from the analogue electrical signal (AS) passing through the zero-crossing circuit, whose frequency is reduced by a factor of two