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In this paper, we propose a method for direct conversion of MDCT coefficients to DFT coefficients, without passing through time signal reconstruction. In contrast to previous works, this method is valid for any pair of MDCT and DFT window functions. It is based on the decomposition of the MDCT-to-DFT conversion matrices into a Toeplitz part plus a Hankel part. The latter is split, then mirrored and...
This paper presents a dual-mode switching method between time-domain codec and transform-domain codec of audio coding. It is a key technique of unified speech and audio (music) coding, since the replaying audio quality corresponds to the suitable codec selection and smooth switching between them. The proposed method consists of two steps, codec mode selection and switching. The binary decision trees...
This paper presents a linear operation called Maximal Coherence Rotation (MCR) on paired vectors for stereo audio coding. Intrigued by the idea that stronger coherence between paired channels will lead to higher stereo coding efficiency, we develop MCR to maximize the coherence restricted by being invertible and energy-conserving. It results in equal energy, minimized difference, and always non-negative...
Although widely used otherwise, MDCT is excluded in the current scheme for spatial cues representation, due to its lacking of phase information and energy conservation. But combining MDCT with MDST overcomes the difficulties. Moreover, MDST spectra can be built perfectly from neighboring MDCT spectra. The MDCT-MDST conversion, in matrix form, is approximating to a banded sparse matrix. When applied...
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