发明名称 |
TECHNIQUE FOR ENCODING/DECODING OF CODEBOOK INDICES FOR QUANTIZED MDCT SPECTRUM IN SCALABLE SPEECH AND AUDIO CODECS |
摘要 |
Codebook indices for a scalable speech and audio codec may be efficiently encoded based on anticipated probability distributions for such codebook indices. A residual signal from a Code Excited Linear Prediction (CELP)-based encoding layer may be obtained, where the residual signal is a difference between an original audio signal and a reconstructed version of the original audio signal. The residual signal may be transformed at a Discrete Cosine Transform (DCT)-type transform layer to obtain a corresponding transform spectrum. The transform spectrum is divided into a plurality of spectral bands, where each spectral band having a plurality of spectral lines. A plurality of different codebooks are then selected for encoding the spectral bands, where each codebook is associated with a codebook index. A plurality of codebook indices associated with the selected codebooks are then encoded together to obtain a descriptor code that more compactly represents the codebook indices.
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申请公布号 |
CA2703700(A1) |
申请公布日期 |
2009.05.07 |
申请号 |
CA20082703700 |
申请日期 |
2008.11.04 |
申请人 |
QUALCOMM INCORPORATED |
发明人 |
REZNIK, YURIY;HUANG, PENGJUN;SRINIVASAMURTHY, NAVEEN B.;CHIVUKULA, RAVI KIRAN |
分类号 |
G10L19/14 |
主分类号 |
G10L19/14 |
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