1. A method, comprising: receiving signals from speaker-dedicated first and second microphones; computing, using a computer processor, an energy-based characteristic of the signals for the first and second microphones; determining a speaker activity detection measure from the energy-based characteristics of the signals for the first and second microphones; detecting acoustic events using power spectra for the signals from the first and second microphones; and determining a robust speaker activity detection measure from the speaker activity measure and the detected acoustic events.