Audio extractor can be used to extract the audio signal from an HDMI transmission. While the video signal is displayed on a TV or monitor, the audio signal can be sent digital (S/PDIF) or analogue (stereo) to other devices, such as headphones or a surround receiver.ARC can be enabled at the push of a button on the device or the remote control. Then the audio signal of the connected TV device is routed to the S/PDIF connectors of the switch.