Audio/Video system and function- extending module therefor

摘要

An audio/video apparatus comprises a main unit with a rack (16) into which modules (17) can be removeably plugged. The modules (17) provide content signals to the main unit where they are made perceivable. The modules (17) and the main unit also exchange control signals and HTML is provided by the modules (17) to the main unit to define a suitable user interface for their control.