| 修正离散余弦变换与同时掩蔽效应曲线的关系 |
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| 引用本文： | 谢志文,尹俊勋. 修正离散余弦变换与同时掩蔽效应曲线的关系[J]. 华南理工大学学报(自然科学版), 2006, 34(1): 29-34 |
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| 作者姓名： | 谢志文 尹俊勋 |
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| 作者单位： | 1. 华南理工大学,物理科学与技术学院,广东,广州,510640
2. 华南理工大学,电子与信息学院,广东,广州,510640 |
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| 摘 要： | 通过研究修正离散余弦变换（MDCT）、离散傅氏变换（DFT）和同时掩蔽效应曲线之间的关系，指出由于XMDCT（k）系数代表的谐波其强度和频率移动都与取样率和波数k等参数有关，因此，不可能通过理论或实验的方法得到一个适用于所有取样率和变换块大小的MDCT同时掩蔽效应曲线，量化MDCT系数时仍需通过DFT来计算掩蔽阈．
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| 关 键 词： | 修正离散余弦变换 掩蔽效应 离散傅氏变换 |
| 文章编号： | 1000-565X（2006）01-0029-06 |
| 收稿时间： | 2005-04-04 |
| 修稿时间： | 2005-04-04 |
Relationship Between MDCT and Simultaneous Mask Effect Curve |
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| Xie Zhi-wen,Yin Jun-xun. Relationship Between MDCT and Simultaneous Mask Effect Curve[J]. Journal of South China University of Technology(Natural Science Edition), 2006, 34(1): 29-34 |
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| Authors: | Xie Zhi-wen Yin Jun-xun |
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| Affiliation: | 1. College of Physics Science and Tech. , South China Univ. of Tech. , Guangzhou 510640, Guangdong, China; 2. College of Electronic and Information Engineering, South China Univ. of Tech. , Guangzhou 510640, Guangdong, China |
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| Abstract: | The relationship among modified discrete cosine transform(MDCT),discrete Fourier transform(DFT) and simultaneous mask effect curve is investigated in this paper,concluding that it is impossible to get a MDCT simultaneous mask effect curve being adapted for all sample ratios and transform block sizes via experiments or theoretical analyses,because the amplitude and frequency shift of the sinusoidal component represented by X_(MDCT)((k)) are related to sample ratio and wave number k.Thus,it is necessary to calculate the simultaneous mask threshold by means of DFT in quantifying the MDCT coefficient. |
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| Keywords: | Modified Discrete Cosine Transform mask effect Discrete Fourier Transform |
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