MPEG Surround provides an efficient representation of multi-channel audio signals by a set of down-mixed signals and spatial parameters. These parameters describe the inter-channel spatial properties, which are utilized by the decoder to reconstruct the multi-channel signals from the down-mixed signals. The encoding process includes time/frequency analysis-synthesis filtering and signal down-mixing; hence the computational requirement is highly dependent on the number of surround audio playback channels. Meanwhile, coincident microphone techniques offer compact microphone array geometry and low number of microphones to produce surround sound recording. Usually, the recorded signals are post-processed into multi-channel surround sound signals prior to encoding. In this paper, an MPEG Surround encoding scheme for coincident microphone recording is presented. The main feature is the direct derivation of the spatial parameters and down-mixed signals from the microphone array signals. It minimizes the dependency of the computational demand on the number of surround sound audio channels. Implemented on ARM-based embedded platform, the direct encoding scheme requires approximately 50% less memory and 40% less processing power than the reference encoding scheme.
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