手机电视解决方案

SMS1000手机电视解决方案enabling TV Everywhere

Hierarchal Transmissions Of Elementary Streams In DVB-T/H systems
By: Ronen Jashek, Software Manager, Siano (ronenj@siano-ms.com) November, 2004

1.

What is Hierarchal Transmission (HT)

The following diagram depicts the block diagram of a DVB-T transmitter; DVB-H systems use the DVB-T PHY with several additions that will be explained later on, but other than that they are the same.

Figure 1 - DVB-T Transmitter Block Diagram

As shown above, the source data may appear in many shapes and forms. The intention is to provide flexibility for the network and service providers also in the PHY level. This introduces the hierarchical transmission. A program is usually (although not always) compound out of a video, audio and data stream. All three streams are muxed into a s