發(fā)布時間：2018-04-17 23:36

  本文選題：聲紋識別 + 小波包變換　； 參考：《哈爾濱理工大學》2014年碩士論文

【摘要】：本文所研究的聲紋識別系統(tǒng)主要分為端點檢測，特征提取和識別模型三個部分。端點檢測部分主要研究了基于線性預測倒譜距離和短時過零率的雙門限法，實驗證明新的雙門限法能夠解決傳統(tǒng)雙門限法不能檢測能量低的語音段的問題。特征提取部分，采用了美爾倒譜系數與差分美爾頻率倒譜系數相結合的特征參數，更好的體現了說話人的個性特征。然后對高斯混合模型進行了研究，，提出了分裂法與K均值聚類法相結合的模型參數初始化方法，并用高斯混合模型對兩種端點檢測算法、特征提取算法和訓練方法進行了仿真實驗，在純凈的語音環(huán)境下，系統(tǒng)具有良好的識別效果。 聲紋識別研究的難點之一，即是在背景噪聲下的識別系統(tǒng)的研究。雖然在純凈語音環(huán)境下的識別系統(tǒng)性能很好，但是在噪聲環(huán)境下，識別率明顯降低。本文運用小波變換和小波包變換對噪聲進行了去噪處理實驗，小波包去噪效果明顯優(yōu)于小波變換，然后在小波包常用閾值和折衷閾值的基礎上提出了改進的閾值去噪方法，通過對語音信號的對比仿真實驗，和對整個系統(tǒng)的實驗數據表明，本文提出的基于小波包改進閾值算法很好地去除了噪聲，去噪之后的識別系統(tǒng)取得了較高的識別率。最后將算法應用在實際復雜的噪聲處理中，算法仍然有效地去除噪聲。
[Abstract]:The voiceprint recognition system is mainly divided into three parts: endpoint detection, feature extraction and recognition model.In the end detection part, the double threshold method based on linear predictive cepstrum distance and short time zero crossing rate is studied. The experiment shows that the new double threshold method can solve the problem that the traditional double threshold method can not detect the speech segment with low energy.In the part of feature extraction, the feature parameters of the combination of Mel cepstrum number and differential Mel frequency cepstrum coefficient are adopted, which better reflect the speaker's personality characteristics.Then, the Gao Si mixed model is studied, and the initialization method of the model parameters is proposed, which combines split method and K-means clustering method, and then two endpoint detection algorithms are proposed by the Gao Si mixed model.The simulation results of feature extraction algorithm and training method show that the system has good recognition effect in pure speech environment.One of the difficulties in the research of voiceprint recognition is the research of recognition system under background noise.Although the performance of the recognition system in pure speech environment is very good, the recognition rate is obviously decreased in the noise environment.In this paper, wavelet transform and wavelet packet transform are used to deal with noise. The denoising effect of wavelet packet is obviously better than that of wavelet transform. Then, an improved threshold denoising method is proposed on the basis of common threshold and compromise threshold of wavelet packet.Through the comparison and simulation of speech signal and the experimental data of the whole system, it is shown that the improved threshold algorithm based on wavelet packet can remove the noise very well, and the recognition system after denoising has achieved a high recognition rate.Finally, the algorithm is applied to complex noise processing, and the algorithm is still effective in removing noise.
【學位授予單位】：哈爾濱理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN912.3

【引證文獻】

相關碩士學位論文 前2條

1 張超;語音端點檢測方法研究[D];大連理工大學;2016年

2 沈蓉;智能門禁系統(tǒng)聲紋識別中端點檢測算法研究[D];西安科技大學;2015年

本文編號：1765837