1. A system comprising: a microphone array that produces audio signals in response to capturing audio from an environment; an audio beamformer that is responsive to the audio signals to produce a plurality of directionally focused audio signals corresponding respectively to different directions relative to the microphone array; a speech recognizer configured to: recognize speech from each of the directionally focused audio signals to create text streams of recognized speech; and generate a confidence value for each of the text streams of the recognized speech, wherein each confidence value indicates an estimated accuracy of a respective text stream of the recognized speech from a respective one of the directional audio signals, the confidence value generated based at least in part on expected speech input for an available command lexicon associated with the system; and a selector configured to compare each confidence value and to select at least one of the text streams of the recognized speech from at least one of the directionally focused audio signals based at least in part on the comparing.
1. A system comprising: a microphone array that produces audio signals in response to capturing audio from an environment; an audio beamformer that is responsive to the audio signals to produce a plurality of directionally focused audio signals corresponding respectively to different directions relative to the microphone array; a speech recognizer configured to: recognize speech from each of the directionally focused audio signals to create text streams of recognized speech; and generate a confidence value for each of the text streams of the recognized speech, wherein each confidence value indicates an estimated accuracy of a respective text stream of the recognized speech from a respective one of the directional audio signals, the confidence value generated based at least in part on expected speech input for an available command lexicon associated with the system; and a selector configured to compare each confidence value and to select at least one of the text streams of the recognized speech from at least one of the directionally focused audio signals based at least in part on the comparing. 3. The system of claim 1 , wherein the directionally focused audio signals correspond to different regions of the environment, and wherein the different regions are selected based on predicted locations of human activity within the environment.