When browsing in virtual 3-D environments, a complex sound field should be rendered from multiple audio sources. Since it offers good spatial representation and manipulation possibilities, ambisonics is preferred to other surround encoding systems as an intermediate format. In this paper, several ambisonic decoders are reviewed and designed, which may adapt to different listening conditions, including binaural presentation. Both theoretical justifications and subjective validations are presented. Ambisonic ability to encode multichannel material while preserving its spatial qualities is also discussed.
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