音乐表达偏差(失歌症)量化评价分析

Quantitative evaluation analysis of musical expression bias(amusia)

发音频率(音高)是衡量一个人唱歌好坏的重要标准,人们常说的“跑调”,则是发音频率相比于曲谱频率偏高或者偏低的现象.本工作从频谱分析出发,量化确定频率相对偏差.而后以随机采集的清唱片段为研究对象,总结出频率相对偏差近似服从均值为0,标准差为0.03507的正态分布的规律.根据分布规律,人们可以针对某个人定义音乐表达偏差,量化其演唱准确程度,本项目提出的方法也为指标化失歌症提出了一个具有可行性的算法.

The singing frequency(pitch)is an important criterion for measuring the singer's singing ability.The“tone deafness”is the phenomenon that a singer’s singing frequencies are higher or lower than the music frequencies.Based on the spectrum analysis the relative deviation of the frequency is quantitated determined.With the randomly collected cappella records as the research object,the relative deviation of the frequency approximately follow a normal distribution with mean 0 and standard deviation 0.03507.Thus,it is possible to define the“musical expression deviation”for each singer by providing scores of singing precision and to propose a feasible algorithm in evaluations of amusia.