1. A method for processing acoustic signals, comprising: receiving at least one acoustic signal; deriving one or more acoustic features based on the at least one acoustic signal; determining a global summary of acoustic features based, at least in part, on the derived one or more acoustic features; determining an instantaneous global classification based on a global running estimate and the global summary of acoustic features; updating the global running estimates; deriving an instantaneous local classification based on at least the one or more acoustic features; determining one or more spectral energy classifications based, at least in part, on the instantaneous local classification and the one or more acoustic features; and providing the spectral energy classification.