| 摘要 |
<p>To transfer a multimedia programme in a DAB system, an audio stream is divided into successive segments of variable length, which are marked by means of individual stream marker IDs placed at segment boundaries. The boundaries between segments indicate a change in the multimedia presentation. A scene in the multimedia programme, which, when active, is what the user sees on the display of the receiver, contains links that are waiting to be activated. When a marker associated with one of the links and acting as an excitation is decoded from the audio stream, it activates the link concerned. As a result, either the scene is displayed or the link causes a transition to another scene, which is displayed on the screen. The transition is invisible to the user, so the user perceives the presentation as starting with the right scene.</p> |
