Audio broadcast supply method for vehicle in road tunnels, involves forwarding additional components and announcement signals to antennas moving in road tunnels, instead of audio components

摘要

The method involves deriving a multiplex signal with audio components and additional components e.g. radio data system component, from received audio broadcasting signal. The multiplex signals are respectively applied to a program transmitter and the additional components to an announcement transmitter. The additional components and the announcement signals are forwarded to the antennas moving in the channel, instead of the audio components. An independent claim is also included for an apparatus for audio broadcast supply and for transmission of announcement in channels.