Perkell J, Lane H, Svirsky M, Webster J
Massachusetts Institute of Technology, Research Laboratory of Electronics, Cambridge 02139.
J Acoust Soc Am. 1992 May;91(5):2961-78. doi: 10.1121/1.402932.
Acoustic parameters were measured for vowels spoken in /hVd/ context by four postlingually deafened recipients of multichannel (Ineraid) cochlear implants. Three of the subjects became totally deaf in adulthood after varying periods of partial hearing loss; the fourth became totally deaf at age four. The subjects received different degrees of perceptual benefit from the prosthesis. Recordings were made before, and at intervals following speech processor activation. The measured parameters included F1, F2, F0, SPL, duration, and amplitude difference between the first two harmonic peaks in the log magnitude spectrum (H 1-H2). Numerous changes in parameter values were observed from pre- to post-implant, with differences among subjects. Many changes, but not all, were in the direction of normative data, and most changes were consistent with hypotheses about relations among the parameters. Some of the changes tended to enhance phonemic contrasts; others had the opposite effect. For three subjects, H 1-H2 changed in a direction consistent with measurements of their average air flow when reading; that relation was more complex for the fourth subject. The results are interpreted with respect to: characteristics of the individual subjects, including vowel identification scores; mechanical interactions among glottal and supraglottal articulations; and hypotheses about the role of auditory feedback in the control of speech production. Almost all the observed differences could be attributed to changes in the average settings of speaking rate, F0 and SPL, which presumably can be perceived without the need for spectral place information. Some observed F2 realignment may be attributable to the reception of spectral cues.
对四名使用多通道（Ineraid）人工耳蜗的语后聋患者在/hVd/语境中说出的元音进行了声学参数测量。其中三名受试者在经历了不同时期的部分听力损失后成年后完全失聪；第四名受试者在四岁时完全失聪。这些受试者从假体中获得了不同程度的感知益处。在言语处理器激活之前以及激活后的不同时间间隔进行了录音。测量的参数包括F1、F2、F0、声压级、时长以及对数幅度谱中前两个谐波峰值之间的幅度差（H1 - H2）。从植入前到植入后观察到参数值有许多变化，受试者之间存在差异。许多变化（但不是全部）朝着规范数据的方向发展，并且大多数变化与关于参数之间关系的假设一致。一些变化倾向于增强音位对比；其他变化则产生相反的效果。对于三名受试者，H1 - H2的变化方向与他们阅读时的平均气流测量结果一致；第四名受试者的这种关系更为复杂。根据以下方面对结果进行了解释：个体受试者的特征，包括元音识别分数；声门和声门上发音之间的机械相互作用；以及关于听觉反馈在语音产生控制中的作用的假设。几乎所有观察到的差异都可归因于语速、F0和声压级平均设置的变化，推测这些变化无需频谱位置信息即可被感知。一些观察到的F2重新排列可能归因于频谱线索的接收。
