一种MP3编码中长短区块转换算法  

Long or Short Block Conversion Algorithm in MP3 Coding

作　　者：董志刚[1] 郭隆健[1] 

机构地区：[1]山东电子职业技术学院,山东济南250014

出　　处：《现代电子技术》2010年第5期185-187,共3页Modern Electronics Technique

摘　　要：在MP3的编码流程中,使用了感觉熵(Perceptual Entropy)的方式作为长短区块的判断标准,但此方法容易误判长短区块的使用时机,因此,提出一个时域的算法来判断MP3编码中,长短区块的使用时机。该算法能准确地判断出时域信号中是否有突波信号(Transient)的发生,并减少短区块的误判机率,而且能提升MP3编码后的音频质量。In the process of MP3 encoding,Perceptual Entropy is used to decide the criterion of long or short block. How- ever,misidentification would occur easily by this method. Therefore, an algorithm in time domain to decide the occasion of long or short block. This algorithm can decide the occurrence of the transient in time domain precisely,and decrease the probability of misidentification of the short block. The analyzed results confirm that the proposed algorithm can increase quality of the audio after MP3 encoding.

关 键 词：MP3 差分信号 突波信号 音频质量 

分 类 号：TN919[电子电信—通信与信息系统]