HDMI cables are able to carry both video and audio signals; however, most video cards send only a video signal. The following techniques can be used to send an audio signal through the video card:
• With audio pass-through, an audio output cable is connected to the video card. The video card combines the audio signal with the video signal for HDMI output. This option is often called HDTV out.
• A graphics card with an onboard audio processor can decode and process audio and send it out the HDMI port. This option is often referred to as onboard sound.