An electronic device includes a far-field voice (FFV) processor including a source selection module. The source selection module receives a set of audio signals and determines, for each audio stream, whether the audio stream is relevant to an application. The source selection module receives several separate probability computations, with each probability computation providing a probability of the presence of a particular characteristic. Additionally, the source selection module receives one or more applications as well relevance information (e.g., one or relevant characteristics) associated with the one or applications. The source selection module can used respective probabilities to determine if one or more characteristics are present in an audio signal, and compare the characteristic(s) to the relevance information for the application. Using this information, the source selection module can determine, for each audio signal, to which respective application the audio stream is relevant.