B.1 Definition

26.2603GPPObjective test methodologies for the evaluation of immersive audio systemsRelease 18TS

A Gaussian grid of order N consists of 2(N+1)2 points associated to directions , and , where and denote the elevation and azimuth, respectively. These directions are defined as follows [7]: The elevations are computed as the zeros of the (N+1)-th degree Legendre polynomial
, while the azimuths are given by (in radians) or j.180/(N+1) (in degrees), .

Directions in test setup shall comply with the theoretical values with an accuracy of +/-0.5 degree for all azimuths and +/-0.5 degree for elevations in the range [-80,+80] degrees. For elevation >80 degrees and <-80 degrees, the accuracy shall be respectively +4/-0.5 degrees and +0.5/-4 degrees.