南京大学学报（自然科学版）
南京大學學報（自然科學版）
남경대학학보（자연과학판）
JOURNAL OF NANJING UNIVERSITY(NATURAL SCIENCES)
2015年
1期
25-30
,共6页
时延估计%混响时间%声源定位%广义互相关
時延估計%混響時間%聲源定位%廣義互相關
시연고계%혼향시간%성원정위%엄의호상관
time-delay estimation%reverberation time%the sound source localization%generalized cross-correlation
时延估计是阵列信号处理中的关键技术,是麦克风阵列声源定位系统中常用的方法。影响麦克风阵列声源定位性能的因素有很多,混响就是其中之一。通常麦克风阵列定位系统多处于室内环境中,除了其他干扰噪声和环境噪声的影响外,声源本身经过环境反射造成的混响也会对其性能造成较大的影响。本文在互相关原理的基础上,综合两种不同的频域加权算法,PATH 加权和 ML加权进行改进,弥补了原算法不能同时稳健噪声和混响的不足,并得到多种环境下的最优q值,降低了多径效应对估计阵元间的相对时间延迟的影响,提高了时延估计的准确率和声源定位精度。实验结果证实了新方法的时延估计准确率高和最优q值的有效性。
時延估計是陣列信號處理中的關鍵技術,是麥剋風陣列聲源定位繫統中常用的方法。影響麥剋風陣列聲源定位性能的因素有很多,混響就是其中之一。通常麥剋風陣列定位繫統多處于室內環境中,除瞭其他榦擾譟聲和環境譟聲的影響外,聲源本身經過環境反射造成的混響也會對其性能造成較大的影響。本文在互相關原理的基礎上,綜閤兩種不同的頻域加權算法,PATH 加權和 ML加權進行改進,瀰補瞭原算法不能同時穩健譟聲和混響的不足,併得到多種環境下的最優q值,降低瞭多徑效應對估計陣元間的相對時間延遲的影響,提高瞭時延估計的準確率和聲源定位精度。實驗結果證實瞭新方法的時延估計準確率高和最優q值的有效性。
시연고계시진렬신호처리중적관건기술,시맥극풍진렬성원정위계통중상용적방법。영향맥극풍진렬성원정위성능적인소유흔다,혼향취시기중지일。통상맥극풍진렬정위계통다처우실내배경중,제료기타간우조성화배경조성적영향외,성원본신경과배경반사조성적혼향야회대기성능조성교대적영향。본문재호상관원리적기출상,종합량충불동적빈역가권산법,PATH 가권화 ML가권진행개진,미보료원산법불능동시은건조성화혼향적불족,병득도다충배경하적최우q치,강저료다경효응대고계진원간적상대시간연지적영향,제고료시연고계적준학솔화성원정위정도。실험결과증실료신방법적시연고계준학솔고화최우q치적유효성。
Time-delay estimation algorithm is one of the key technologies in array signal processing,used in the microphone array sound localization system.In recent years,many researches focused on the time-delay estimation algorithm about the microphone array sound localization system.Time-delay estimation algorithm is divided into two steps to orientate the sound source.First,deal with the signal received by microphone,estimate the relative time-delay.And then,get the location of the sound source on the basis of the spatial geometric relationship of microphone array and the relative time-delay.There are many factors that can influence the performance of the microphone array sound localization system,reverberation is one of them.Usually a microphone array sound localization system is in the indoor environment,in addition to the influence of other interfering noise and environmental noise,the sound source itself through the environment reflection caused by reverberation will cause great influence to its performance.The size of the indoor environment and the location of sound source can also lead to different reverberation.Based on the principle of cross-correlation,the paper composite two kinds of different frequency weighted algorithm:the PATH and the ML,overcome noise and reverberation,and get the optimal q.Reduce the in-fluence of the multipath effect arrays to estimate the relative time-delay.Improve the accuracy of time-delay estimation and sound localization.The experimental results also proved the new method of time-delay estimation ac-curacy,the effectiveness of the optimal q.
