Squeezing the auditory space: a new approach to multi-channel audio coding
This paper presents a novel solution for efficient representation of multi-channel spatial audio signals. Unlike other spatial audio coding techniques, the solution inherently requires no additional side information to recover the surround sound panorama from a two-channel downmix. For a typical five-channel case, only a stereo downmix signal is required for the decoder to reconstruct the full five-channel audio signal. In addition to the bandwidth saved by transmitting no side information, the technique has significant advantages in terms of computational complexity.
B. Cheng, C. H. Ritz & I. S. Burnett, "Squeezing the auditory space: a new approach to multi-channel audio coding", in 7th Pacific Rim Conference on Multimedia: Proceedings, 2006, pp. 572-581.