CEA-861 signals carried by HDMI are electrically compatible with the CEA-861 signals used by the digital visual interface (DVI). No signal conversion is necessary, nor is there a loss of video quality when a DVI-to-HDMI adapter is used.
The Hum is a generic name for a common class of phenomena consisting of a persistent, invasive low-frequency sound from an unknown source. In addition, the phenomena is only audible to certain people, existing at the far low end of the audio spectrum, with a peak power spectral density between about 10 and 60 Hz.
How Hum works. Hum is simple â just plug it in to add connected car features to your drive. Even better, you can easily access Hum features on the go using the Hum App. And with built-in Wi-Fi Hotspot, you can easily connect up to 10 devices, so passengers can stream music, movies and shows.