CAJ | 학술논문

针对目前噪声环境下电子耳蜗汉语声调和语句识别率急剧下降问题，提出了一种基于时间精细结构过零刺激方案（FSZC）。利用语音信号时间精细结构的过零点时刻产生高速脉冲刺激序列，从而不仅将时间精细结构编码到电子耳蜗语音算法中，同时采用过零点时刻非均匀的采样脉冲刺激序列，确保了语音的空间编码和时间编码。声学模拟实验表明，相比于连续交替采样策略（CIS）和过零点时刻刺激策略（ZCT），FSZC方案在汉语声调和语句识别率上都有较大程度的提高，而且在噪声环境下对于声调和语句识别具有相对较强的抗噪性。
침대목전조성배경하전자이와한어성조화어구식별솔급극하강문제，제출료일충기우시간정세결구과령자격방안（FSZC）。이용어음신호시간정세결구적과영점시각산생고속맥충자격서렬，종이불부장시간정세결구편마도전자이와어음산법중，동시채용과영점시각비균균적채양맥충자격서렬，학보료어음적공간편마화시간편마。성학모의실험표명，상비우련속교체채양책략（CIS）화과영점시각자격책략（ZCT），FSZC방안재한어성조화어구식별솔상도유교대정도적제고，이차재조성배경하대우성조화어구식별구유상대교강적항조성。
The performance of Mandarin tone and sentence recognition in cochlear implant falls sharply in noise environ-ment. In order to solve the problem, this paper proposes a coding strategy based on the Zero-Crossing time of the temporal Fine Structure(FSZC)of the speech. The high-speed pulse stimulation sequences are generated at the zero-crossing time of the fine structure, thus the coding strategy not only includes the fine structure but also uses the non-uniform pulses which ensures the spatial and time encoding of the speech. Acoustic simulation results show that compared with Continuous Interleaved Sampling(CIS)strategy and the Zero-Crossing Time(ZCT)stimulating strategy, the Mandarin tone and sentence recognition rate have improved to a greater extent with the FSZC strategy, and the FSZC strategy has a stronger anti-noise performance.