16. The system of claim 15 wherein the instructions further cause the one or more computers to perform operations comprising receiving a second acoustic input from a direction other than the direction of the user.
19. The system of claim 16 wherein the instructions further cause the one or more computers to perform operations comprising: performing automatic speech recognition based on the first acoustic input and the second acoustic input; and identifying a user command based on the performing automatic speech recognition based on the first acoustic input and the second acoustic input.