Detection of voice activity in an audio signal

A device comprising a voice activity detector (6) for detecting voice activity in a speech signal using digital data formed on the basis of samples of an audio signal. The voice activity detector (6) comprises a first element (6.3.1) adapted to examine, whether the signal has a highpass nature. The voice activity detector (6) also comprises a second element (6.3.2) adapted to examine the frequency spectrum of the signal. the voice activity detector (6) is adapted to provide an indication of speech when the first element (6.3.1) has determined that the signal has highpass nature or the second element (6.3.2) has determined that the signal has not flat frequency response.