基于MIDI哼唱檢索算法的研究
[Abstract]:With the development of multimedia technology, multimedia information with audio, video and image information as the main body has gradually replaced text information. The traditional information retrieval technology based on text marking is difficult to realize the retrieval of multimedia information. How to retrieve multimedia information effectively and quickly has become an urgent problem in the development of search engine. Content based Music Information Retrieval (CBMIR) is to extract the music feature vectors (including rhythm, melody and strong tone etc.) according to the intrinsic attributes of music, to construct the music feature database, and to submit the retrieval items in the form of music score and natural humming. The extracted feature vector is compared with the music feature database and the similarity is calculated to achieve retrieval matching. As one of the most direct and natural input methods, QueryBy humming (QBH) has naturally become the focus of research on content-based retrieval technology and has wide application prospects. Hem signal processing, music feature database construction and retrieval matching algorithm are the focus of research. This paper studies the processing flow of humming retrieval signal, introduces signal preprocessing, parameter extraction and note segmentation algorithm based on energy and pitch changes, analyzes the characteristics of Hem signal, and puts forward an improved note segmentation algorithm. Based on the analysis of midi music file structure and midi melody information extraction algorithm, a melody representation method of pitch difference, note length difference and note interval is constructed, which can effectively overcome the problems of note concatenation and note spacing. This paper introduces four common retrieval and matching algorithms, and focuses on improving the dynamic time warping algorithm from two aspects: note concatenation and note spacing. According to the characteristics of note concatenation and the effect of note interval on searching matching position, the dynamic time warping algorithm is improved. The improved note segmentation algorithm and the dynamic time warping algorithm are tested on the humming retrieval platform. The experimental results show the effectiveness of the improved algorithm.
【學位授予單位】:江西師范大學
【學位級別】:碩士
【學位授予年份】:2012
【分類號】:TP391.3
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