Cochlear implant speech recognition with speech maskers
Cochlear implant speech recognition with speech maskers
复制标题
DOI：
10.1121/1.1772399
复制
发表时间：
2004-08-01
影响因子：
2.4
通讯作者：
Assmann, P
中科院分区：
文献类型：
--
作者：
Stickney, GS;Zeng, FG;Assmann, P
在听力正常的听者和植入人工耳蜗的听者中，使用由稳态语音频谱形状的噪声或竞争句子组成的掩蔽器来衡量语音识别性能。来自男性说话者的目标句子被呈现在三个相互竞争的说话者(相同的男性、不同的男性或女性)中的一个在场的情况下，或者该说话者以几个目标与掩蔽者的比率产生的语音频谱形状的噪声。对于听力正常的听者，目标-掩蔽器的组合通过设计成模拟人工耳蜗的噪声激励声码器进行处理。对于未经处理的刺激，听力正常的对照组保持了高水平的清晰度，目标与掩蔽者的比率低至0分贝，并表现出从掩蔽中释放出来，使用单言者掩蔽者比使用稳定状态噪声的表现更好。相比之下，无论是植入物还是听力正常的受试者，都没有观察到通过植入物模拟收听的掩蔽性释放。当与正常听力控制中发现的相同说话者相比，单一说话者掩蔽者是不同的说话者时，模拟组和植入组的表现没有改善。这些结果被解释为信息掩蔽和调制干扰在具有波动掩蔽的人工耳蜗语音识别中的重要作用的证据。这种信息掩蔽可能源于当光谱分辨率降低时增加的目标掩蔽者相似度。(C)2004年美国声学学会。
Speech recognition performance was measured in normal-hearing and cochlear-implant listeners with maskers consisting of either steady-state speech-spectrum-shaped noise or a competing sentence. Target sentences from a male talker were presented in the presence of one of three competing talkers (same male, different male, or female) or speech-spectrum-shaped noise generated from this talker at several target-to-masker ratios. For the normal-hearing listeners, target-masker combinations were processed through a noise-excited vocoder designed to simulate a cochlear implant. With unprocessed stimuli, a normal-hearing control group maintained high levels of intelligibility down to target-to-masker ratios as low as 0 dB and showed a release from masking, producing better performance with single-talker maskers than with steady-state noise. In contrast, no masking release was observed in either implant or normal-hearing subjects listening through an implant simulation. The performance of the simulation and implant groups did not improve when the single-talker masker was a different talker compared to the same talker as the target speech, as was found in the normal-hearing control. These results are interpreted as evidence for a significant role of informational masking and modulation interference in cochlear implant speech recognition with fluctuating maskers. This informational masking may originate from increased target-masker similarity when spectral resolution is reduced. (C) 2004 Acoustical Society of America.