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Table 1 The five acoustic classes defined for evaluation

From: Audio segmentation of broadcast news in the Albayzin-2010 evaluation: overview, results, and discussion

Class Description
Speech [sp] Clean speech from a close microphone without any kind of background sound
Music [mu] Music is understood in a general sense
Speech over music [sm] Overlapping of speech and music classes or speech with noise in background and music classes
Speech over noise [sn] Speech which is not recorded in studio conditions, or it is overlapped with some type of noise (applause, traffic noise, etc.), or includes several simultaneous voices (for instance, synchronous translation)
Other [ot] This class refers to any type of audio signal (including silence and noises) that does not correspond to the other four classes