The function takes a single input source containing univariate matrix instances or multivariate matrix instances. The matrix contain Fourier coefficients produced by a previous TD_DFFT2 call or some other method. The input matrix has elements that are in rectangular (real, imaginary) or polar (amplitude, phase) form.
The input source can be passed in using either an ART_SPEC or MATRIX_SPEC. If the input source table for TD_IDFFT2 is not referenced using an ART_SPEC, then the Fourier coefficient results in the table must be in the RAW format. Use TD_DFFT2CONV to convert the results from HUMAN_READABLE to RAW format prior to using TD_IDFFT2.