面向情感分析的古筝乐曲声谱图信息主干提取

发布时间：2018-01-15 21:25

本文关键词：面向情感分析的古筝乐曲声谱图信息主干提取　出处：《复旦学报(自然科学版)》2017年02期 　论文类型：期刊论文

【摘要】：古筝是一种古老的中国传统民族乐器,为一弦一音的弹拨乐器.情感作为古筝演奏中的重要表达成分,受到各种演奏技法的影响.本文分析了各种不同演奏技法所产生的声音信号的频谱以及声谱图特点,并提出了一种基于声谱图有限局部峰值的乐曲信息主干提取方法.乐曲信息主干提取分为时域提取与频域提取两个步骤.首先,义甲触弦瞬间,会出现短暂的非谐波性质的碰撞声,与后续琴弦稳定振动期间的声谱图横条纹形成对比,通过对声谱图进行时域一阶差分,并根据设定阈值二值化,能够准确获得各音符的触弦时间点;其次,在每一音符时间范围内,对声谱图进频域一阶差分,获取各帧频域峰值位置,并对各峰值根据幅值进行排序后保留有限个峰值坐标,同时根据前后音符对比,去除因前一音符声音的延续造成的对后一音符声谱图的影响.通过乐曲声谱图主干提取,能够有效地体现出组成乐曲的各音符的主要信息,为进一步深入分析古筝曲的情绪提供基础.
[Abstract]:Guzheng is an ancient Chinese traditional national musical instrument, which is a plucked instrument with one string and one tone. Emotion is an important expression component in playing guzheng. Under the influence of various playing techniques, this paper analyzes the frequency spectrum and the characteristics of sound spectrum of the sound signals produced by different playing techniques. A music information trunk extraction method based on the finite local peak value of sound spectrum is proposed. The music information trunk extraction is divided into two steps: time domain extraction and frequency domain extraction. There will be a transient non-harmonic collision sound, which is compared with the transverse stripes of the sound spectrum during the subsequent steady vibration of the string. The first order difference of the sound spectrum is carried out, and the threshold is binary according to the set threshold. Can accurately obtain the chord contact point of each note; Secondly, in the time range of each note, the first order difference of the forward frequency domain of the acoustic spectrum is obtained, and the peak position of each frame in frequency domain is obtained, and the peak value is sorted according to the amplitude, and a limited number of peak coordinates are retained. At the same time, according to the comparison of the two notes, the influence of the continuation of the former note on the latter note is removed. The music sonogram is extracted by the trunk of the music sonogram. It can effectively reflect the main information of each note of the composition of the music, and provide a basis for further analysis of the mood of the guzheng music.
【作者单位】：苏州大学物理与光电·能源学部;
【基金】：江苏省自然科学基金青年基金(BK20140354)
【分类号】：TN912.3
【正文快照】： 古筝又名汉筝、秦筝、瑶筝、鸾筝等,是最古老的中国民族传统乐器中的一种,属于弹拨乐器,一弦一音.它的音色优美,音域宽广、演奏技巧丰富,表现力强,有“群声之主,众乐之师”之美称.战国时期盛行于“秦”地,最早为五弦,唐宋时为十三弦,后增至十六弦、十八弦、二十一弦等,目前最

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