发明名称 |
MDCT-based complex prediction stereo coding |
摘要 |
The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data. |
申请公布号 |
US9111530(B2) |
申请公布日期 |
2015.08.18 |
申请号 |
US201113638898 |
申请日期 |
2011.04.06 |
申请人 |
Dolby International AB |
发明人 |
Purnhagen Heiko;Carlsson Pontus;Villemoes Lars |
分类号 |
H04R5/00;G10L19/008 |
主分类号 |
H04R5/00 |
代理机构 |
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代理人 |
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主权项 |
1. A decoder system for providing a stereo signal by complex prediction stereo coding, the decoder system comprising:
an upmix stage adapted to generate the stereo signal based on first frequency-domain representations of a downmix signal and a residual signal, each of the first frequency-domain representations comprising first spectral components representing spectral content of the corresponding signal expressed in a first subspace of a multidimensional space, the upmix stage comprising: a module for computing a second frequency-domain representation of the downmix signal based on the first frequency-domain representation thereof, the second frequency-domain representation comprising second spectral components representing spectral content of the signal expressed in a second subspace of the multidimensional space that includes a portion of the multidimensional space not included in the first subspace; a weighted summer for computing a side signal on the basis of the first and second frequency-domain representations of the downmix signal, the first frequency-domain representation of the residual signal and a complex prediction coefficient encoded in a bit stream signal received by the decoder system; and a sum-and-difference stage for computing the stereo signal on the basis of the first frequency-domain representation of the downmix signal and the side signal, wherein the upmix stage is further operable in a pass-through mode, in which said downmix and residual signals are supplied to the sum-and-difference stage directly. |
地址 |
Amsterdam NL |