The authors develop a 4-pi sampling reverberator, named “VSVerb,” which restores a 4-pi reverberant field by using information of virtual sound sources which are captured in a target space. Acoustical properties of virtual sound sources are detected from sound intensities which are calculated from impulse responses measured by an Ambisonic A-format microphone. Spatial information of the virtual sound sources is translated into time responses, then the 4-pi spatial reverberation is obtained. Several schemes for detecting accurate acoustic properties of virtual sound sources have been developed so far, and their practicalities have been examined under various playback environments, e.g, 5.1.4ch, 7.1.4ch, 22.2ch, 24ch and 40ch. This time, the authors introduce an application example for implementation of the VSVerb into VR content production. Key features are 1) Binaural rendering by using an individual HRIR which is given as an AES69 sofa format and 2) Dynamic processing of changing reverberation with chasing listener’s movement.
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