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自动音乐记谱是音乐信号处理中的关键技术。本文描述了一个快速的自动复音音乐记谱方法。该方法采用回声器时频分析(RTFI)作为时频分析工具,主要由两个阶段组成,能量基的音符切分和多基频估计。本文所采用的多基频估计方法首先将RTFI能量谱按照谐音组合原理转换为基频能量谱,并基于基频能量谱采用简单的峰拾起方法对基频做初步估计;然后根据频谱不规律性和乐音谐音结构的基本假定,消除初步估计中的错误预测。
Automatic music notation is the key technique in music signal processing. This article describes a quick automatic polyphonic music notation method. This method uses echo time-frequency analysis (RTFI) as a time-frequency analysis tool, mainly composed of two phases, energy-based note segmentation and multi-frequency estimation. The multi-frequency estimation method adopted in this paper firstly transforms the RTFI energy spectrum into a fundamental energy spectrum according to the principle of harmonic composition, and makes a preliminary estimation of the fundamental frequency based on the fundamental frequency energy spectrum by a simple peak pick-up method. The basic assumptions of the sex and musical tone homonyms eliminate mispredictions in preliminary estimates.