Low Data Rate MPEG-1 Layer III Enhancement
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 lo...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2002
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| Online Access: | http://ndltd.ncl.edu.tw/handle/c7b845 |
| Summary: | 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.
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