Cowan R S, Blamey P J, Sarant J Z, Galvin K L, Clark G M
Department of Otolaryngology, University of Melbourne, Royal Victorian Eye and Ear Hospital, Australia.
J Acoust Soc Am. 1991 Jan;89(1):360-8. doi: 10.1121/1.400471.
Identification of multiple-electrode stimulus patterns was evaluated in nine adult subjects, to assess the feasibility of providing additional speech information through the tactual display of an electrotactile speech processor. Absolute identification scores decreased from 97.8% for single electrodes, to 61.9% for electrode pairs, and, to 31.8% for electrode triplets. Although input information increased with paired-and triple-electrode stimuli, information transmission scores were not significantly increased for either electrode pairs (2.99 bits) or triplets (2.84 bits) as compared with single electrodes (2.84 bits). These results suggest that speech coding strategies using stimulus patterns of electrode pairs or triplets would provide little improvement beyond that found for the present single-electrode scheme. However, higher absolute identification scores (73.6%), and an increase in information transmission to 3.88 bits, were recorded for test stimuli containing all combinations of paired and single electrodes. Based on this finding, two stimulus sets using a restricted number of combinations of paired and single electrodes were evaluated. The two stimulus sets simulated the spatial patterns of paired and single electrodes arising from use of alternative speech coding schemes to increase consonant voicing information. Results for the two stimulus sets showed higher electrode identification scores (79.7% and 90.4%), as compared with paired-electrode stimuli. Although electrode identification score was not as high as for single electrodes, information transmission was increased to 3.31 bits for the VF2 stimulus set. Analysis of the responses also showed that scores for identification of simulated voicing information conveyed by the two stimulus sets were 99.4 and 90.4% correct.(ABSTRACT TRUNCATED AT 250 WORDS)
在9名成年受试者中评估了多电极刺激模式的识别，以评估通过电触觉语音处理器的触觉显示提供额外语音信息的可行性。绝对识别分数从单电极的97.8%降至电极对的61.9%，再降至电极三联体的31.8%。尽管配对和三联电极刺激的输入信息增加，但与单电极（2.84比特）相比，电极对（2.99比特）或三联体（2.84比特）的信息传输分数均未显著增加。这些结果表明，使用电极对或三联体刺激模式的语音编码策略相比目前的单电极方案几乎没有改进。然而，对于包含配对和单电极所有组合的测试刺激，记录到了更高的绝对识别分数（73.6%），信息传输增加到3.88比特。基于这一发现，评估了使用有限数量配对和单电极组合的两种刺激集。这两种刺激集模拟了使用替代语音编码方案产生的配对和单电极的空间模式，以增加辅音浊音信息。两种刺激集的结果显示，与电极对刺激相比，电极识别分数更高（分别为79.7%和90.4%）。尽管电极识别分数不如单电极高，但VF2刺激集的信息传输增加到了3.31比特。对反应的分析还表明，两种刺激集传达的模拟浊音信息的识别分数正确率分别为99.4%和90.4%。（摘要截短为250字）
