Intensity stereo coding 방법을 이용한 MPEG Audio 압축 연구 = (A) Study on MPEG Audio Compression using Intensity Stereo Coding Method

다국어 초록 (Multilingual Abstract)

Since 1988 MPEG has been working on the standardization of high- quality low-bit rate audio coding. In 1992 and 1994 the MPEG-1 and MPEG-2 audio standards were completed.
In MPEG 1 audio compression standard, the intensity stereo coding plays important role. Because , When the two channel of stereo of signals are separately coded , layer1 and layer2 have a transparency quality at bit rates higher than 2*128 kbit/s.
For bit rate lower than 2*96kbit/s, coding impairments may be audible . But Intensity stereo coding can be applied to improve the quality of these stereophonic signals at low bit rates.
A Intensity stereo[10] is that A method of exploiting stereo irrelevance or redundancy in stereophonic audio programs based on retaining at high frequencies only the energy envelope of the right and left channels
This Paper shows that the intensity stereo coding has difficulty in signal in scale factor consistency .
For solving the problem , this paper shows that Angle rotation transform can be applied to the intensity stereo coding.

목차 (Table of Contents)

• 제 1 장 서론 = 1
• 제 2 장 이론 = 3
• 2.1 MPEG Audio = 3
• 2.1.1 MPEG Audio 음질과 bit rate = 3
• 2.1.2 MPEG Audio는 어디에 쓰는가? = 4
• 2.2 MPEG Audio 압축 = 6
• 2.2.1 MPEG Audio 압축 원리 = 6
• 2.2.2 MPEG Audio encoding 알고리즘 = 10
• 2.2.3 MPEG-1 Audio Frame의 구조 = 15
• 제 3 장 Intensity stereo Coding = 18
• 3.1 Intensity stereo coding 정의 = 20
• 3.1.1 Intensity stereo coding 역할 = 20
• 3.1.2 Intensity stereo coding과 기존 알고리즘의 문제점 = 20
• 3.1.3 Propose 알고리즘 = 22
• 3.1.4 SMR(Signal to Mask ratio) = 24
• 제 4 장 Simulation And Test Result = 26
• 4.1 Simulation and Methods = 26
• 4.2 Simulation 결과 = 27
• 4.3 Frequency domain simulation = 28
• 제 5 장 결론 = 34
• 參考文獻 = 35