Audio corresponding to the moving picture of a virtual reality (VR) camera can be recorded using an A or B-format microphone. The recorded signal is decoded with respect to the look direction for generating binaural or multichannel audio following the visual scene. Postproduction possibilities on given B-format signals are restricted to linear matrixing and filtering, limiting the use of recorded B-format contents. A time-frequency adaptive method is presented, which can apply equalization to different sources (directions) in the B-format without a need for decoding it. The proposed approach estimates direct sound power in each direction to be equalized and applies a single Wiener filter per B-format channel for individually equalizing all desired directions at once.
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