15. One or more non-transitory computer-readable media storing computer-executable instructions that, when executed, cause one or more processors to perform acts comprising: producing output audio based, at least in part, on an output signal; analyzing an input audio signal to detect an occurrence of a trigger expression in the input audio signal; analyzing the output signal to detect an occurrence of the trigger expression in the output signal; and determining to disqualify the occurrence of the trigger expression in the input audio signal based, at least in part, on the occurrence of the trigger expression in the output signal.
19. The one or more computer-readable media of claim 15 , wherein the output signal represents content comprising one or more of the following: music; radio; live, recorded, or machine-generated speech; person-to-person communications; command responses; or text.