Recommendations

Alright well first of all, DON'T BUILD THIS. DO NOT TRY THIS PROJECT AT HOME. I got creeped out enough just writing about it. If you are building a smart home device that has the capability to continuously listen to conversation, take the utmost care to make sure that your device's microphone data stream cannot be accessed externally. A partial solution to this problem that smart home speakers like Amazon Echo and Google Home employ is doing all of the continuous audio processing on-device; that is, while waiting for the "wake word" to be spoken ("Okay Google", "Alexa"), they process audio on local hardware with a very space/power efficient neural network. This helps a lot with security, because only the specific query of user is transferred to the cloud ("What is the weather today?") and the not the conversation you had on the phone before that where you read out your credit card number.