Methods and systems for activity based video recording are provided. Exemplary methods include: receiving an amplified signal to improve sensitivity, the amplified signal being produced by a circuit using an analog differential signal, the analog differential signal being received from a microphone; converting the amplified signal to a digital signal; detecting the digital signal; activating a video camera to record video for a predetermined amount of time using the detecting; storing the recorded video; placing the video camera into power saving mode.