Nowadays, virtual reality interfaces allow the user to change perspectives in
six degrees of freedom (6DoF) virtually, and consistently with the visual part,
the acoustic perspective needs to be updated interactively. Single-perspective
rendering with dynamic head rotation already works quite reliably with upmixed
first-order Ambisonic room impulse responses (ASDM, SIRR, etc.). This
contribution presents a plugin to free the virtual perspective from the
measured one by real-time perspective extrapolation: The PerspectiveLiberator.
The plugin permits selecting between two different algorithms for directional
resolution enhancement (ASDM, 4DE). And for its main task of convolution-based
6DoF rendering, the plugin detects and localizes prominent directional sound
events in the early Ambisonic room impulse response and re-encodes them with
direction, time of arrival, and level adapted to the variable perspective of
the virtual listener. The diffuse residual is enhanced in directional
resolution but remains unaffected by translatory movement to preserve as much
of the original room impression as possible.Comment: 4 pages, submitted to conference: DAGA 2021, Vienna, Austria, 202