While multiple versions of HDMI have come to fruition over the years, the basics haven’t changed: it’s an AV cable that sends audio and video upstream from your AV components (e.g., cable box ...
a DVI-to-HDMI adapter cable is used to connect the video. The audio must be cabled separately as DVI transfers only video. The HDMI circuit detects the DVI signals and switches to the DVI protocol.