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This paper presents a compression technique to improve the quality of three-dimensional (3D) audio produced by multiple loudspeaker channels or by headphone. The approach is based on extracting the side information of spatial sound sources within the three-dimensional space when capturing the sound sources. Different from other compression technique, the distances of sound sources are included in...
This paper presents a novel FFT domain bandwidth extension algorithm and adapts the proposed algorithm to AMR-WB+ audio standard. The framework is given and key technologies are described in detail. It operates with low computational complexity compared to the bandwidth extension of AMR-WB+. The subjective quality test result is given showing the quality of proposed bandwidth extension combined with...
The modified discrete cosine transform (MDCT) is widely used in current perceptual audio coding schemes. This paper presents an integer approximation of this lapped transform, called integer MDCT, which is derived from the MDCT using lifting scheme, and a scalable lossless system based on MPEG AAC and Integer MDCT is presented providing a lossless enhancement of AAC coding scheme, which provides bit-exact...
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