Sensor Device

An approximately nine-inch (23 cm) wide horizontal bar connected to a small circular base with a ball joint pivot, the Project Natal sensor is designed to be positioned lengthwise above or below the video display. The device features an "RGB camera, depth sensor, multi-array microphone, and custom processor running proprietary software", which provides full-body 3D motion capture, facial recognition, and voice recognition capabilities. The Project Natal sensor's microphone array enables the Xbox 360 to conduct acoustic source localization and ambient noise suppression, allowing for things such as headset-free party chat over Xbox Live.

The depth sensor consists of an infrared projector combined with a monochrome CMOS sensor, and allows the Project Natal sensor to see in 3D under any ambient light conditions. The active depth-sensing range of the depth sensor is adjustable, with the Project Natal software capable of automatically calibrating the sensor based on the gameplay and environment conditions, such as the presence of couches.

Project Natal is reportedly based on software technology developed internally by Microsoft and hardware intellectual property acquired from time-of-flight camera developer 3DV Systems. Before agreeing to sell all its assets in March 2009, 3DV had been preparing its own depth-sensing webcam controller, known as the ZCam.