3. A computer-implemented method, comprising: receiving a first utterance from a device, the first utterance including an audible command; determining first data corresponding to the first utterance; obtaining second data corresponding to a second utterance, wherein the second utterance is not received from the device; comparing the first data corresponding to the first utterance to the second data corresponding to the second utterance; and cancelling processing of the first utterance in response to the first data substantially matching the second data.
3. A computer-implemented method, comprising: receiving a first utterance from a device, the first utterance including an audible command; determining first data corresponding to the first utterance; obtaining second data corresponding to a second utterance, wherein the second utterance is not received from the device; comparing the first data corresponding to the first utterance to the second data corresponding to the second utterance; and cancelling processing of the first utterance in response to the first data substantially matching the second data. 9. The computer-implemented method of claim 3 , further comprising receiving a plurality of utterances from a plurality of devices at a substantially similar time; and wherein the comparing comprises comparing the plurality or received utterances to each other to determine whether the plurality of received utterances are substantially similar.