一种改进的基于离散余弦变换的声音压缩算法  

An Improved Sound Signal Compression Algorithm Based on Discrete Cosine Transform

作　　者：辛欣[1,2] 陈曙东[3] 仝明磊[4] 胡文皓 刘陈伟[1,2] 葛浩栋 

机构地区：[1]中国科学院大学电子电气与通信工程学院,北京100049 [2]江苏物联网研究发展中心,江苏无锡214135 [3]中国科学院微电子研究所,北京100029 [4]上海电力学院电子与信息工程学院,上海200090

出　　处：《计算机与现代化》2016年第10期1-5,共5页Computer and Modernization

基　　金：江苏省基础研究计划--面上研究项目(BK20141116)

摘　　要：声音压缩传输是异常声音检测系统中的重要模块。针对现有算法不能满足系统实时性要求的缺陷,提出一种采用角度误差限定分段拟合和离散余弦变换(DCT)的声音压缩算法。该算法先设置合理的角度误差,从时域波形的第一个采样点开始按照几何夹角和限定的角度误差逐点判断是否可以压缩,分段模拟信号波形,然后采用传统的基于离散余弦变换算法,选取合适的阈值再次进行压缩。实验结果表明,与传统的声音压缩算法相比,提出的算法在压缩效果上有较明显的改善。Sound compression and transmission is very important part in abnormal sound detection system. However, the existing sound signal compression methods cannot meet the real-time requirements of the system. For this situation, the paper proposed a sound signal compression algorithm adopted piecewise fitting of limited angle error and discrete cosine transform. The algorithm first set a reasonable angle error, according to waveform characteristics, from the first sampling point-by-point to determine wheth- er it can be compressed according to the geometric angle, then piecewise analog sound signal waveform, after that using the tradi- tional algorithm based on discrete cosine transform, select the appropriate threshold to compress again. Simulation results show that, the proposed algorithm has better performance compared with the traditional compression algorithm.

关 键 词：声音压缩 角度误差 离散余弦变换 信噪比 压缩率 主观感受 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]