This slide shows a generic signal chain block diagram. It is important to understand that there is a dedicated signal chain for a specific signal type. All functions in the signal chain are carried between the processor and the peripherals via interfaces. Signals can be categorized as multimedia, such as audio or video. Audio signals can be sounds in a loud speaker or a headphone and video signals can be analog, such as VGA, or digital, such as HDMI. Data can be categorized to the USB type.