> Xu’s 2017 paper “DolphinAttack: Inaudible Voice Commands” describes how we used ultrasonic signals to inject inaudible voice commands into speech recognition

> Xu’s 2017 paper “DolphinAttack: Inaudible Voice Commands” describes how we used ultrasonic signals to inject inaudible voice commands into speech recognition systems such as Siri, Google Now, Samsung S Voice, Huawei HiVoice, Cortana, Alexa, and the navigation system of an Audi automobile. So cool. I had this idea a long time ago but never approached it. Kudos to them for some follow through.