4. A device comprising: a profile building component in communication with an electronic data store; a sensor configured to detect presence of a user independent of a direction of the user's gaze and without detecting physical contact between the user and the device; and a speech recognition component; wherein the profile building component is configured to: receive, from the sensor, an indication that presence of the user was detected; begin to listen for utterances from the user in response to receiving the indication; receive a first voice signal corresponding to a first utterance of a user; determine an identity of the user using the first voice signal; process the first voice signal to determine user information and a word sequence that indicates that a second utterance corresponding to a language characteristic is likely to be uttered by a second user different than the user at a time after a current time; store the user information in a user profile associated with the identity of the user; and select a second user acoustic model corresponding to the language characteristic for performing speech recognition.
4. A device comprising: a profile building component in communication with an electronic data store; a sensor configured to detect presence of a user independent of a direction of the user's gaze and without detecting physical contact between the user and the device; and a speech recognition component; wherein the profile building component is configured to: receive, from the sensor, an indication that presence of the user was detected; begin to listen for utterances from the user in response to receiving the indication; receive a first voice signal corresponding to a first utterance of a user; determine an identity of the user using the first voice signal; process the first voice signal to determine user information and a word sequence that indicates that a second utterance corresponding to a language characteristic is likely to be uttered by a second user different than the user at a time after a current time; store the user information in a user profile associated with the identity of the user; and select a second user acoustic model corresponding to the language characteristic for performing speech recognition. 5. The device of claim 4 , wherein at least one of the profile building component or the speech recognition component is further configured to process the first voice signal to determine user information by performing signal processing on the first voice signal to determine acoustic information.