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No.45 (1994/10) >

Title :即時応答型音程トレーナーの為の周波数解析手法について
Title alternative :Real-Time Response Pitch Discrimination Training System : A Pitch Computing Method
Authors :仲間, 正浩
Authors alternative :Nakama, Masahiro
Issue Date :31-Oct-1994
Abstract :It is meaningful to develop a Real-Time Response Pitch Descrimination System by utilizing a computing sound pitch. There are many approaches in computing sound pitch. But, no approach was seen in developing enough response-time and accuracy of frequency discrimination for pitch discrimination training. Therefore new methodology is considered to improve response-time and accuracy of frequency discrimination. In FFT (Fast Fourier Transformation), there exist mathematical relations such that (1) time_range_of_analysis^*frequency_discrimination = 1 and (2) response_time = time_range_of_analysis/2^*computing_time, which shows no improvement in both response-time and accuracy of frequency discrimination. Fortunately, there exist the fact such that many peaks of power spectrum : f[Hz], f^*2[Hz], f^*3[Hz], ・・・・・・ as the results of FFT from a single f[Hz] pitch sound. To improve both response-time and accuracy of frequency discrimination, the following new method is considered in this paper. Step1 : Compute pitch roughly from f[Hz] power spectrum peak. Step2 : Compute pitch accurately from f^*n[Hz].
Type Local :紀要論文
ISSN :0386-5738
Publisher :琉球大学
URI :http://hdl.handle.net/20.500.12000/1374
Citation :琉球大学教育学部紀要 第一部・第二部 no.45 p.411 -418
Appears in Collections:No.45 (1994/10)

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