测试材料的滤波通带对言语识别率的影响

目的 探讨测试材料的滤波截止频率对汉语普通话单音节词识别率的影响。方法 设计滤波言语测试软件，分别选取截止频率为0．25、0．5KHz低通和1．2、4、8KHz的高通频带，滤波器斜率为48dB／倍频程，强度为最大舒适级（maximum comfortable level，MCL），即受试者足以听到而又尚未引起不适的强度。对听力正常青年人20例40耳进行滤波后的言语识别率测试。结果 截止频率为0.25、0．5KHz低通和8KHz高通滤波言语识别率与正常言语的识别率有显著性差异（P〈0．0055）。男声与女声间无明显差异（P〉0.05）。结论 滤波因素中，0．5KHz以上和8KHz以下频带对言语识别有显著作用，受试者主要应用0．5KHz以上和8KHz以下频带信息对言语进行识别。听力正常人的滤波言语识别率不受声音材料中性别因素的影响。

Effects of filtered frequency bands in test material on filtered speech recongnition score

Objective To study the effects of filtered cutoff frequency in test material on Chinese mandarin monosyllabic word speech recognition score(SRS).Methods Design filtered speech software,20 students(40 ears)with nomal hearing were studied with low-pass filtered frequency bands(cutoff frequency 0.25,0.5 KHz)and high-pass filtered frequency bands(cutoff frequency 1,2,4,8 KHz) when speech level was his(or her)maximum comfortable level(MCL) and steepness was 48 dB/octove.Results There were significant differences between low-pass filtered frequency bands with cutoff frequency were 0.25,0.5 KHz with nomal SRS,also does the high-pass filtered frequency band with cutoff frequency was 8 KHz(P<0.0055).In normal hearing situation,SRS obtained by male and female speeches,were similar(P>0.05).Conclusion It was suggested that the frequency bands above 0.5 KHz and below 8 KHz have significant effects on SRS while the frequency bands above 0.5 KHz and below 8 KHz were important to speech recognition.Speaker gender didn't affect SRS in normal hearing listeners.