StarTech HDMI Audio Extractor 1080p Extract and convert the audio from your HDMI signal to 3.5mm audio in 2.1 stereo sound. This HDMI audio extractor lets you separate stereo audio from your HDMI video signal and connect it to a 3.5mm audio device, such as your stereo sound system or desktop speakers. You can also extract the audio from the HDMI signal and integrate it into an optical TOSLINK application, using the included digital SPDIF adapter.