Low Data Rate MPEG-1 Layer III Enhancement

• Main Authors: Kuo-Hsiang Huang, 黃國祥
• Other Authors: Jar-Ferr Yang
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/c7b845

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 90 === The research of this thesis is mainly focused on study and implementation of MPEG-1 Layer III (MP3) for low bit-rate applications. First, we propose a lowpass filter approach and its daptive spectrum reduction method to reduce the defeat of the MP3 codec in low bit-rate applications. Both lowpass and spectrum reduction algorithms will sacrifice the high frequency components of audio signals. To improve the high frequency performance, we further suggest a high frequency compensation method to make up the quasi-harmonics of high frequency spectrum. By using spectrum reduction and quasi-harmonic compensation method, the MPEG-1 Layer III audio coder can achieve a high perceptual quality for low bit-rate applications.