Parametric coding of spatial audio
Abstract
A wide range of techniques for coding a single speech or audio signal channel have been developed over the last few decades. In addition to pure redundancy reduction, sophisticated source and receiver models have been considered for reducing the bitrate. Only a few techniques address joint-coding of the channels of stereo1 and multi-channel audio signals. Stereo and multi-channel audio signals evoke an auditory spatial image in a listener. Thus the receiver model may consider properties of spatial hearing of the auditory system for reducing the bitrate. This has been done in previous techniques by considering the importance of interaural level difference cues at high frequencies and by considering the binaural masking level difference for computing the masked threshold for multiple audio channels. The coding scheme proposed in this thesis aims at being more systematic and parameterized. A stereo or multi-channel audio signal is represented as a single downmixed audio channel plus side information. The side information contains the inter-channel cues inherent in the original audio signal that are relevant for the perception of the properties of the auditory spatial image. At the decoder the stereo or multi-channel audio signal is reconstructed such that its inter-channel cues approximate the corresponding cues of the original audio signal. This enables coding of stereo or multi-channel audio signals at a bitrate nearly as low as a mono audio coding bitrate because the side…
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