Discrimination of speech processed by low-pass filtering and pitch-invariant frequency lowering.
Discrimination of speech processed by low-pass filtering and pitch-invariant frequency lowering.
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DOI：
10.1121/1.389834
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发表时间：
1983-08
期刊：
影响因子：
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通讯作者：
C. Reed;B. Hicks;L. Braida;N. Durlach
中科院分区：
文献类型：
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作者：
C. Reed;B. Hicks;L. Braida;N. Durlach
辅音辨别力的正常听力的听众进行了研究，单音节使用均匀（线性）或非均匀（扭曲）压缩频率轴的频率降低处理。压缩信号的带宽为2500或1250 Hz，并且除了低通滤波之外，还针对两个带宽中的每一个研究了五个压缩特性。刺激是由24个辅音和3个元音组成的24个辅音-元音音节，由两名男性和女性说话者各记录三次。实验采用了“流动-说话人、流动-元音、流动-发声”的两间隔、带反馈的强制选择程序。正如预期的那样，2500 Hz带宽的性能上级1250 Hz带宽。对于每个带宽，压缩方案，实现了更大的降低高频相对于低频导致最高的性能。然而，所研究的最佳降频系统的总体性能与低通滤波获得的性能大致相当。发音功能的性能模式是不同的频率降低和过滤。一般来说，降低是上级过滤摩擦音的对比度，但鼻音和半元音的对比度较差。
Consonant discriminability by normal-hearing listeners was studied for monosyllables processed using frequency lowering with either uniform (linear) or nonuniform (warped) compression of the frequency axis. The bandwidth of the compressed signal was either 2500 or 1250 Hz and five compression characteristics were studied, in addition to low-pass filtering, for each of the two bandwidths. Stimuli were 24 consonant-vowel syllables made up of 24 consonants and three vowels, recorded three times by each of two male and female speakers. A "roving-speaker, roving-vowel, roving-utterance," two-interval, forced-choiced procedure with feedback was employed. As expected, performance for the 2500-Hz bandwidth was superior to that for the 1250-Hz bandwidth. For each bandwidth, compression schemes which accomplished greater lowering of the high frequencies relative to the low frequencies resulted in the highest performance. Overall performance for the best frequency-lowering system studied, however, was roughly comparable to that obtained for low-pass filtering. Patterns of performance over articulatory features were different for frequency lowering and filtering. In general, lowering was superior to filtering for contrasts of fricative sounds but inferior for contrasts of nasals and semivowels.