4. The method of claim 2 , wherein the voice activity detection signal is generated based on the determination of whether the primary acoustic signal includes speech, and the voice activity detection signal indicating whether automatic speech recognition is to occur.
4. The method of claim 2 , wherein the voice activity detection signal is generated based on the determination of whether the primary acoustic signal includes speech, and the voice activity detection signal indicating whether automatic speech recognition is to occur. 5. The method of claim 4 , wherein the voice activity detection signal is a value within a range of values corresponding to the level of speech detected in the primary acoustic signal.