Transmission, reception and synchronisation of two data streams

摘要

In digital mobile broadcast systems, data streams for audio and video are sent independently. As this means that both streams may arrive out of sync, they need to be synchronised for reproduction upon reception. For this, the relation between timestamps of both streams should be known. For broadcast, this is difficult because the information is usually not directly available upon the first reception of broadcasted streams and it cannot be send upon playback request. Therefore, the invention proposes to reset counters for generating timestamps upon the start of transmission of the broadcast. The incremental rate of the timestamps can be send on beforehand, as this information usually remains constant over a longer period in time. The invention provides methods for transmission, reception and synchronisation.