摘要
首先从CQT(Constant Q Transform)和离散傅里叶变换(Discrete Fourier Transform,DFT)比较的角度,对定义CQT的依据以及CQT与DFT的关系作出分析;然后讨论CQT的时域直接计算和频域快速计算;最后分析这一计算方法在音乐的音调分析中所产生的频率误差。本文的分析将为实际应用中CQT算法参数的选取、寻找音阶频率估计误差的修正方法等提供重要参考依据。
Firstly, the basis of defining CQT and the relationship between CQT and DFT are analyzed by comparing them. Then, CQT＇s calculations of direct method in time-domain and efficient method in frequency-domain are discussed. At last, frequency estimation errors generated by the algorithm are analyzed. Analysis of this paper can provide an important reference for deciding the parameter values of CQT and for finding an approach of compensating estimation errors.
出处
《信息与电子工程》
2005年第4期270-274,共5页
information and electronic engineering
关键词
信息处理技术
音乐信号处理
常数Q变换
离散傅里叶变换
音调提取
information processing technology
music signal processing
constant Q transform
DFT： music pitch extraction
