CAJ | 학술논문

目的：研究不同强度白噪声对语音特征提取的影响，总结变化规律，为带噪语音的声纹鉴定提供参考。方法对 TIMIT 连续语音语料库中的录音样本加载不同强度白噪声，使用语音工作站提取纯净语音、不同信噪比带噪语音的基频、共振峰，研究分析白噪声对语音特征参数的影响。结果低噪环境下，语音共振峰相对稳定，增大噪声强度，共振峰出现偏移或者无法检出现象；各阶共振峰抗噪能力不同，低阶共振峰抗噪声能力强，稳定度高，高阶共振峰抗噪能力弱，稳定性差，低阶共振峰抗噪能力优于高阶共振峰；基音在各种噪声强度下稳定度高，具备较强鲁棒性。结论信噪比降低会引起共振峰频率偏移，甚至丢失共振峰；噪声对高阶共振峰影响大于低阶共振峰；基频在噪声环境下具备较高的抗干扰能力，声纹鉴定中应重点分析噪声对语音特征的影响。
목적：연구불동강도백조성대어음특정제취적영향，총결변화규률，위대조어음적성문감정제공삼고。방법대 TIMIT 련속어음어료고중적록음양본가재불동강도백조성，사용어음공작참제취순정어음、불동신조비대조어음적기빈、공진봉，연구분석백조성대어음특정삼수적영향。결과저조배경하，어음공진봉상대은정，증대조성강도，공진봉출현편이혹자무법검출현상；각계공진봉항조능력불동，저계공진봉항조성능력강，은정도고，고계공진봉항조능력약，은정성차，저계공진봉항조능력우우고계공진봉；기음재각충조성강도하은정도고，구비교강로봉성。결론신조비강저회인기공진봉빈솔편이，심지주실공진봉；조성대고계공진봉영향대우저계공진봉；기빈재조성배경하구비교고적항간우능력，성문감정중응중점분석조성대어음특정적영향。
Objective To study the influence of white noise on the extraction of phonetic feature and to offer a reference for identification of the speech mixed with noises. Methods After embedding the different intensity of white noise into the speech samples which were selected from the DARPA TIMIT acoustic-phonetic continuous speech corpus, we utilized speech workstation to extract pitches and formants from both pure speech and noisy speech of different signal-to-noise ratio(SNR) thereby analyzing the influence of white noise on the parameters of phonetic feature. Results Formant frequency kept relatively stable in low noisy condition but appeared shifting or even undetected under certain conditions with the noise strength enhancing. For each order of formant, the anti-noise ability was different, with the low order showing strong and highly stable but the high order weak and poorly stable. However, the pitch retained steady in various noisy conditions. Conclusions Reducing SNR can result in formant frequency shifting or vanishing. The influence of noise on the formant of high order is bigger than that of the low order. Pitch keeps highly stable in noisy environment.