Spatial audio coding by squeezing: analysis and application to compressing multiple soundfields
Spatially Squeezed Surround Audio Coding (S 3 AC) proposed by the authors provides efficient compression of multi-channel surround audio. Compression is achieved by exploiting human sound localisation blur to save the surround soundfield information in a squeezed stereo soundfield. In this paper, the localisation loss during the S 3 AC analysis/synthesis is evaluated and the minimum size of the S 3 AC squeezed soundfield is derived in a frequency dependent form. Results from perceptual listening tests show that, compared with standard squeezing from a 360 ° surround soundfield to a 60 ° stereo soundfield, a more intensive squeezing method, such as from 360°-to-5°, does not introduce audible localisation distortion. This leads to a further application of S 3 AC for compressing more than one surround soundfield into a single stereo downmix for applications such as spatialised teleconferencing. This application is also described and perceptually evaluate
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