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研究生:黃國祥
研究生(外文):Kuo-Hsiang Huang
論文名稱:MPEG-1LayerIII音訊編碼器於低位元率之改良
論文名稱(外文):Low Data Rate MPEG-1 Layer III Enhancement
指導教授:楊家輝楊家輝引用關係
指導教授(外文):Jar-Ferr Yang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:電機工程學系碩博士班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:64
中文關鍵詞:音訊編碼
外文關鍵詞:MPEG-1 Layer IIImp3
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本論文主要是以MPEG-1 Layer III(MP3)音訊壓縮編碼器之實現與研究為主,並針對MP3 在低位元率時的缺失,提出編碼效能分析及音質的改善。首先,我們利用低通濾波器與適應性頻譜截斷法將MP3 低位元率編碼的缺點加以修正;然後,再針對上述方法之缺點加以改良,提出高頻補償法以補償高頻缺失的部分,使得MP3 音訊壓縮編碼器於低位元率的編碼效能及音質更加完善。
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.
第一章數位音訊編碼簡介................................................. 1
第二章MPEG-1 Layer III 編解碼器....................................... 13
第三章MPEG-1 Layer III 在低位元率的效能............................... 34
第四章MPEG-1 Layer III 之高頻補償..................................... 48
第五章結論............................................................ 60
參考文獻.............................................................. 61
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[2] ISO/IEC JTC1/SC29/WG11 MPEG, “Information technology - Coding of moving
pictures and associated audio for digital storage media at up to about 1.5 Mbit/s, Part 3: Audio,” IS11172-3, 1993.
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[10] J. Watkinson, “The MPEG Handbook,” Focal Press, 2001.
[11] Y.H Lam and R.W. Stewart, “Digital Filtering for Audio Coding,” An Enabling Technology (Ref. No. 1998/252), IEE Colloquium on, 1998.
[12] D.Y Pan, “Digital Audio Compression,” Digital Technical Journal Vol. 5 No. 2, Spring, 1993.
[13] F. Wylie, “Digital audio data compression,” Electronics & Communication
Engineering Journal, February 1995.
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