1. A method of signal processing, said method comprising: based on a plurality of M-channel training signals, training a plurality of coefficient values of a source separation filter structure to obtain a converged source separation filter structure, where M is an integer greater than one; and deciding whether the converged source separation filter structure sufficiently separates each of the plurality of M-channel training signals into at least an information output signal and an interference output signal, wherein at least one of the plurality of M-channel training signals is based on signals produced by M microphones in response to at least one information source and at least one interference source while the microphones and sources are arranged in a first spatial configuration, and wherein another of the plurality of M-channel training signals is based on signals produced by M microphones in response to at least one information source and at least one interference source while the microphones and sources are arranged in a second spatial configuration different than the first spatial configuration.