1. A method for voice sensing and authentication, the method comprising: causing a peripheral device to transition to a second power mode, from a first power mode, in response to a first acoustic signal, the first acoustic signal representing at least one captured sound; determining a signal to noise ratio based on at least one of the first acoustic signal and a second acoustic signal, the second acoustic signal representing another at least one captured sound; adapting, based on the signal to noise ratio, sensitivity of a detection threshold of voice sensing; in the second power mode, authenticating a user, using at least one hardware processor, based at least in part on the second acoustic signal, the authenticating of the user comprising matching the second acoustic signal to a spoken keyword previously obtained using keyword analysis; and applying noise reduction to the second acoustic signal prior to the authenticating of the user.