基于谐波结构的钢琴基频估计方法

Piano fundamental frequency estimation algorithm based on harmonic structure

精确估计钢琴声音的基频,可以帮助调音师进行调律。由于钢琴声音的谐波结构存在基频丢失、谐波丢失以及不谐和性等特殊性,常用基频估计方法精度低甚至出现严重错误。本文基于谐波频率的不谐和性特征,应用最小二乘法估计声音的基频和不谐和系数。仿真实验表明,该方法切实可行,检测精度显著提高,满足钢琴定音调律的要求。

Estimating the piano fundamental frequency accurately is helpful to a tuner for his adjusting melody. Because of fundamental frequency losing, harmonic losing and inharmonicity, general fundamental frequency algorithm is invalid. Based on the inharmonicity of harmonic frequency, this paper proposes to apply the least square method to estimate the fundamental frequency and inharmonicity coefficient. With simulating tests, the method is proved feasible and highly accurate and meets the demands of adjusting melody.