11. The system of claim 9 , the one or more programs further comprising instructions to modify the adaptive speech recognition model with training data derived from audio user interaction with a digital assistant.
12. The system of claim 11 , the one or more programs further comprising instructions for, after said updating: receiving invocation of the digital assistant; receiving speech input from a second user; generating speech-to-text output; and providing the speech-to-text output to the digital assistant.