TY - JOUR T1 - Capture and recreation of higher order 3d sound fields via reciprocity JF - International Conference on Audio Display Y1 - 2004 A1 - Li,Z. A1 - Duraiswami, Ramani A1 - Gumerov, Nail A. AB - We propose a unified and simple approach for capturing andrecreating 3D sound fields by exploring the reciprocity prin- ciple that is satisfied between the two processes. Our ap- proach makes the system easy to build, and practical. Us- ing this approach, we can capture the 3D sound field by a spherical microphone array and recreate it using a spheri- cal loudspeaker array, and ensure that the recreated sound field matches the recorded field up to a high order of spheri- cal harmonics. A design example and simulation results are presented. For some regular or semi-regular microphone layouts, we design an efficient parallel implementation of the multi-directional spherical beamformer by using the ro- tational symmetries of the beampattern and of the spherical microphone array. This can be implemented in either soft- ware or hardware. A simple design example is presented to demonstrate the idea. It can be easily adapted for other regular or semi-regular layouts of microphones. ER -