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    • 2. 发明申请
    • SCALABLE SPEECH AND AUDIO ENCODING USING COMBINATORIAL ENCODING OF MDCT SPECTRUM
    • 使用MDCT频谱的组合编码的可扩展语音和音频编码
    • WO2009055493A1
    • 2009-04-30
    • PCT/US2008/080824
    • 2008-10-22
    • QUALCOMM IncorporatedREZNIK, YuriySRINIVASAMURTHY, Naveen, B.CHIVUKULA, Ravi KiranHUANG, Pengjun
    • REZNIK, YuriySRINIVASAMURTHY, Naveen, B.CHIVUKULA, Ravi KiranHUANG, Pengjun
    • G10L19/14G10L19/02
    • G10L19/24G10L19/038
    • A scalable speech and audio codec is provided that implements combinatorial spectrum encoding. A residual signal is obtained from a Code Excited Linear Prediction (CELP)-based encoding layer, where the residual signal is a difference between an original audio signal and a reconstructed version of the original audio signal. The residual signal is transformed at a Discrete Cosine Transform (DCT)-type transform layer to obtain a corresponding transform spectrum having a plurality of spectral lines. The transform spectrum spectral lines are transformed using a combinatorial position coding technique. The combinatorial position coding technique includes generating a lexicographical index for a selected subset of spectral lines, where each lexicographic index represents one of a plurality of possible binary strings representing the positions of the selected subset of spectral lines. The lexicographical index represents non-zero spectral lines in a binary string in fewer bits than the length of the binary string.
    • 提供可实现组合频谱编码的可扩展语音和音频编解码器。 从基于码激励线性预测(CELP)的编码层获得残留信号,其中残留信号是原始音频信号和原始音频信号的重建版本之间的差异。 残差信号在离散余弦变换(DCT)型变换层处变换,以获得具有多个谱线的对应变换频谱。 使用组合位置编码技术对变换频谱谱线进行变换。 组合位置编码技术包括为选定的谱线子集生成词典索引,其中每个词典索引代表表示所选择的谱线子集的位置的多个可能的二进制串中的一个。 字典索引表示二进制串中的非零谱线,比二进制串的长度少。