电子学报
電子學報
전자학보
ACTA ELECTRONICA SINICA
2009年
10期
2291-2297
,共7页
语音编码%音频编码%立体声编码%嵌入式编码
語音編碼%音頻編碼%立體聲編碼%嵌入式編碼
어음편마%음빈편마%입체성편마%감입식편마
speech coding%audio coding%stereo coding%embedded coding
基于国际电信联盟标准化组织(ITU-T)编码标准G.729.1,本文提出了一种嵌入式变速率立体声语音与音频编码方法.本算法利用G.729.1和改进的调制叠接变换(Modulated Lapped Transform,MLT)编码技术对输入信号的中值与边带信息进行分层编码,形成具有嵌入式结构的码流.编码器可处理宽带和超宽带的立体声信号,宽带立体声信号编码的最大码率为48kb/s,超宽带立体声信号编码的最大速率为64kb/s.实现结果表明,本编码器的编码质量均达到了ITU-T对G.EV-VBR立体声编码的指标要求.
基于國際電信聯盟標準化組織(ITU-T)編碼標準G.729.1,本文提齣瞭一種嵌入式變速率立體聲語音與音頻編碼方法.本算法利用G.729.1和改進的調製疊接變換(Modulated Lapped Transform,MLT)編碼技術對輸入信號的中值與邊帶信息進行分層編碼,形成具有嵌入式結構的碼流.編碼器可處理寬帶和超寬帶的立體聲信號,寬帶立體聲信號編碼的最大碼率為48kb/s,超寬帶立體聲信號編碼的最大速率為64kb/s.實現結果錶明,本編碼器的編碼質量均達到瞭ITU-T對G.EV-VBR立體聲編碼的指標要求.
기우국제전신련맹표준화조직(ITU-T)편마표준G.729.1,본문제출료일충감입식변속솔입체성어음여음빈편마방법.본산법이용G.729.1화개진적조제첩접변환(Modulated Lapped Transform,MLT)편마기술대수입신호적중치여변대신식진행분층편마,형성구유감입식결구적마류.편마기가처리관대화초관대적입체성신호,관대입체성신호편마적최대마솔위48kb/s,초관대입체성신호편마적최대속솔위64kb/s.실현결과표명,본편마기적편마질량균체도료ITU-T대G.EV-VBR입체성편마적지표요구.
Based on the International Telecommunication Union Telecommunication Standardization Sector (ITU-T) standardization G.729.1,an embedded variable bit-rates stereo speech and audio coding method is proposed in this paper.In this coding algorithm, the middle information and side information of stereo signal are processed separately by G. 729.1 and modified modulated lapped transform coding techniques, the structure of bit-stream is embedded and the bit-stream can be divided into several layers. Wideband stereo signal and super-wideband stereo signal all can be processed by this codec. The maximum bit-rates of wideband stereo signal and super-wideband stereo signal are 48kb/s and 64kb/s, respectively. The test results indicate that the quality of the embedded speech and audio coding algorithm at stereo coding layers is close to Terms of Reference for ITU-T G. EV-VBR stereo codec.
