Effects of Time and Frequency Resolution on Nonnegative Matrix Factorization


Sophea, Seng and Phon-Amnuaisuk, Somnuk (2007) Effects of Time and Frequency Resolution on Nonnegative Matrix Factorization. In: 2007 International Symposium on Information Technology Convergence (ISITC 2007). IEEE Xplore, pp. 203-207. ISBN 0-7695-3045-1

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In this paper, we present the comparison of note events extraction using Nonnegative Matrix Factorization (NMF) with input from a classic Fourier Transform (FT) and with input from an improved time resolution FT. In order to improve time resolution, FT sample window length must be increased. As the window length increases, the time resolution is sacrificed for a better frequency resolution. Hence, good time and frequency resolutions are required in our polyphonic music transcription task. Here, we first apply Zero padding algorithm to classic FT to help maintain the time and frequency resolution. Then, we apply the hanning window. Finally we use NW to decompose the note events. The experiment shows that NW performs the decomposition of multivariate nonnegative data matrix well after applying the improved time resolution FT.

Item Type: Book Section
Subjects: T Technology > T Technology (General)
Q Science > QA Mathematics > QA71-90 Instruments and machines > QA75.5-76.95 Electronic computers. Computer science
Divisions: Faculty of Engineering and Technology (FET)
Depositing User: Ms Suzilawati Abu Samah
Date Deposited: 07 Oct 2011 06:17
Last Modified: 20 Nov 2013 07:21
URII: http://shdl.mmu.edu.my/id/eprint/3187


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