VOWEL AND CONSONANT RECOGNITION OF COCHLEAR IMPLANT PATIENTS USING FORMANT-ESTIMATING SPEECH PROCESSORS
VOWEL AND CONSONANT RECOGNITION OF COCHLEAR IMPLANT PATIENTS USING FORMANT-ESTIMATING SPEECH PROCESSORS
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DOI：
10.1121/1.395436
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发表时间：
1987-07-01
影响因子：
2.4
通讯作者：
SELIGMAN, PM
中科院分区：
文献类型：
--
作者：
BLAMEY, PJ;DOWELL, RC;SELIGMAN, PM
收集28例参加多通道人工耳蜗临床试验的患者在单独听力(H)、单独读脂(L)和听力加读脂（HL）条件下的元音和辅音混淆矩阵。所有患者都是深度到完全失聪，“听力”是指通过植入物呈现的听觉信息。H组元音和辅音的平均得分分别为49%和37%，HL组显著高于L组。信息传递和多维尺度分析表明，在H和L条件下，不同的语音特征在不同的层次上传递。在HL条件下，视觉和听觉信号为每个特征提供了独立的信息源。对于元音，听觉信号是持续时间信息的主要来源，而视觉信号是第一和第二形成峰频率信息的主要来源。植入物提供了语音的幅度包络信息和800 ~ 4000 Hz主谱峰的估计频率，这对辅音识别很有用。对300 ~ 1000hz间附加峰的估计频率和幅度进行编码的语音处理器通过改善第一共振峰和发声信息的传输，提高了H条件下元音和辅音的识别。
Vowel and consonant confusion matrices were collected in the hearing alone (H), lipreading alone (L), and hearing plus lipreading (HL) conditions for 28 patients participating in the clinical trial of the multiple-channel cochlear implant. All patients were profound-to-totally deaf and "hearing" refers to the presentation of auditory information via the implant. The average scores were 49% for vowels and 37% for consonants in the H condition and the HL scores were significantly higher than the L scores. Information transmission and multidimensional scaling analyses showed that different speech features were conveyed at different levels in the H and L conditions. In the HL condition, the visual and auditory signals provided independent information sources for each features. For vowels, the auditory signal was the major source of duration information, while the visual signal was the major source of first and second formant frequency information. The implant provided information about the amplitude envelope of the speech and the estimated frequency of the main spectral peak between 800 and 4000 Hz, which was useful for consonant recognition. A speech processor that coded the estimated frequency and amplitude of an additional peak between 300 and 1000 Hz was shown to increase the vowel and consonant recognition in the H condition by improving the transmission of first formant and voicing information.