1. An apparatus for detecting voice activity in an audio signal, the apparatus comprising: a first voice activity detector configured to make a first voice activity detection decision based at least in part on the voice activity of a first audio signal received from a first microphone; a second voice activity detector configured to make a second voice activity detection decision based at least in part on an estimate of a direction of the first audio signal and an estimate of a direction of a second audio signal received from a second microphone; and a classifier configured to make a third voice activity detection decision based at least in part on said first and second voice activity detection decisions.