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B-Format Decoding Based on Adaptive Beamforming

B-Format signals can be decoded into signals with first order directivity. For stereo and multichannel decoding it would be desirable to have more channel separation than what is achievable by first order. DirAC (directional audio coding) and HARPEX (high resolution plane wave expansion) achieve higher channel separation by means of using a parametric B-Format model to estimate plane waves and diffuse sound, and adaptively rendering those. A limitation is that plane wave and diffuse models are too simple to represent complex B-Format signals. We propose a B-Format decoder, where each channel is generated by an independent adaptive B-Format beamformer. Each beam is generated independently of the other beams, circumventing the limitation when using a single B-Format signal model.

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AES - Audio Engineering Society