Binaural activity map of Second Order Ambisonics with shelf filtering
Friday, September 10th, 2010Here’s the binaural activity map that results from sampling a second order Ambisonic encode-decode process using a Dirac impulse signal at 36 discrete azimuths (10 degree steps) around the horizontal circle.
The Ambisonic encode-decode used 128 point FIR shelf filters (with 2nd order and 1st order pivot frequencies at 1200Hz and 700Hz respectively), rendered out via 6 virtual speakers to binaural outputs. (I designed and implemented the rendering system in Matlab and Pd).
The activity map shows the likely lateralization based on Gaik’s algorithm, in which the raw HRTFs are used as a reference for natural ITD and ILD combinations.
