离散余弦变换的频率分解特性研究  

Study on the Function of Discrete Cosine Transformation in Spectra Decomposition

作　　者：周晓正[1] 周骏拓[2] 

机构地区：[1]北京石油化工学院信息工程学院,北京102617 [2]北京大学基础医学院,北京100084

出　　处：《北京石油化工学院学报》2013年第2期1-4,共4页Journal of Beijing Institute of Petrochemical Technology

摘　　要：利用离散余弦变换的频率分解特性,语音信号可以用一系列具有固定频率的余弦函数来表示。而生理实验表明,人耳外周听觉系统正是由一组代表不同特征频率的神经纤维来表达进入耳蜗的声波信号。因此,离散余弦变换可以应用到外周听觉系统的神经编码中。首先介绍离散余弦变换的定义,然后具体分析其频率分解作用的物理意义。对语音信号的仿真实验结果表明,离散余弦变换可以完好地保存原有信号中的各种频率成分。By using discrete cosine transform, sound wave can be represented by a population of cosine functions with different characteristic frequencies. Physiological experiments show that the human peripheral auditory system represents the sound wave entering the cochlear by a population of spatially distributed auditory nerves. Therefore, discrete cosine transform can be applied in neural coding in peripheral auditory. The definition of discrete cosine transformation is introduced firstly. Then the physical meaning of its frequency decomposing is analyzed. Simulations of audio signal show that discrete cosine transform can keep all frequencies included in the original signal perfectly.

关 键 词：离散余弦变换 语音编码 外周听觉系统 神经编码 

分 类 号：Q811.213[生物学—生物工程]