基于相位声码器法的音乐信号正弦分量检测  

Sinusoidal Components Detection of Misical Signal Based on Phase Vocoder Method

作　　者：杨莘[1] 佘坤[2] 李娟[1] 

机构地区：[1]武汉科技大学信息科学与工程学院,湖北武汉430081 [2]中兴通讯股份有限公司多媒体服务部,江苏南京210012

出　　处：《现代电子技术》2010年第1期106-109,112,共5页Modern Electronics Technique

摘　　要：设计和实现一种基于相位声码器的音乐信号正弦分量检测方法,该方法将STFT等效为一组均匀滤波器,将各正弦分量分离,并由各通道输出的相位变化率估计正弦分量的瞬时频率,然后通过寻找STFT通道中心频率与瞬时频率映射的定点进行正弦分量检测;同时,针对原始相位声码器的缺点,设计了一个多采样率、非均匀滤波器组对其进行改进。实验结果表明,该方法具有良好的瞬时频率跟踪性能,可作为音乐信号多音高估计的分析前端。A sinusoidal components detection method of misical signal based on phase vocoder is designed. It regards the STFT as a uniform filter bank by which the sinusoidal components are separated from each other,and their instantaneous frequency is estimated with the phase change rate of the STFT channals＇ output. To overcome the shortage of original phase vo coder,an advanced method is also proposed which is based on a multi- sampling rates and nonuniform filter bank. The experiment results show that this method has good performance in tracking instantaneous frequencies, so it can be used as the front - end of the melody line extraction system.

关 键 词：多音高检测 正弦分析模型 相位声码器法 短时傅里叶变换 

分 类 号：TP391.42[自动化与计算机技术—计算机应用技术]