OASS is a modfied version of OAST which computes the spatial statistics of the reverberant field in 2-D waveguides with 1-D rough interfaces. The input file and output features are very similar to the ones for OAST. OASS also includes several components of OASN, both interms of specification of 3-D array geometries and the option of generating covariance matrices. The covariance matrices may be added to the covariance matrices computed for the mean field using OASN. The addition is performed offline using the addcov utility included in the oases package. Two other utilities are provided for computing from the generated .xsm files the normalized spatial correlation ( nrmcov ) or the coherence ( coher ).
The theoretical background for OASS as well as several applications are described in Ref.[15].
OASS is always used in conjunction with OAST or OASR. These are used first to compute the mean field and generate a file (.rhs ) containing the mean field boundary operators at the rough interfaces (option s). OASS then uses these to comp[ute the scattered or reverberant field using the expressions in Ref.[15].
OASS has two rather indepemdent brances: