IEC 61883-7 pdf download – Consumer audio/video equipment – Digital interface – Part 7: Transmission of ITU-R BO.1294 System B

IEC 61883-7 pdf download – Consumer audio/video equipment – Digital interface – Part 7: Transmission of ITU-R BO.1294 System B
1scope
This specification defines packetization and transmission for transport streams of ITU-R BO.1294system B (DirecTV system/Dss) over the lEEE 1394 Serial Bus.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies.For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 61883-1,Consumer audio/video equipment – Digital interface – Part 1: General
ITU-R BO.1294:1997，Common functional requirements for the reception of digital multi-programme television emissions by satellites operating in the 11/12 GHz frequency range1
IEEE 1394:1995,Standard for a High Performance Serial Bus
IEEE 1394a:2000,Standard for a High Performance Serial Bus – Amendment 1
3Terms, definitions and abbreviations
For the purposes of this part of lEC 61883, the following terms and definitions apply.3.1 Terms and definitions
For the purposes of this part of lEC 61883,the following terms and definitions apply.
3.1.1
byte
eight bits of data, used as a synonym for octetNOTE The symbol for byte is B.
3.1.2
cSR architecture
convenient abbreviation of the following reference: ISO/IEC13213:1994,Informationtechnology – Microprocessor systems – Control and status register (CSR) architecture formicrocomputer buses
3.1.3
quadlet
four bytes of data
3.2Abbreviations
For the purpose of this part of lEC 61883,the following abbreviations used in IEEE 1394apply:
AVIC
Audio Video Control
CIP
Common lsochronous Packet
CTR
Cycle Time Register
HD
High Definition
IEEE
The Institute of Electrical and Electronics Engineers,Inc.
MPEG
Motion Picture Expert Group
TSP
Transport Stream Package
4Dss transport stream
A DSS transport stream consists of transport stream packets with a length of 130 B.NOTE Refer to Annex 1 of ITU-R BO.1294:1997 for more information.
A stream may contain several programs. In Figure 1, an example is given of a transportstream,which consists of several programs. Often,only one or a few programs need to betransmitted. lf a program selection is carried out, then only those transport stream packetsfrom that particular transport stream are transmitted. In this situation, the occupied bandwidthon the lEEE 1394 interface can be reduced.Reduction of the bit rate is carried in a smoothingbuffer.As a result of the smoothing operation, the transport stream packets will be shifted intime.
The transport stream packets at the output of the smoothing buffer are transmitted over theIEEE 1394 interface. During transmission，this interface will introduce some jitter onthe arrival time of the transport stream packets in the receiver.
In the Dss transport stream，there are strong requirements on the timing of the transportstream packets. The jitter introduced by the both the smoothing buffer and the transmitter ofthe interface has to be compensated. This is done by adding a time stamp to the transportstream packets:
– at the moment it arrives at the input of the smoothing buffer; or- at the input of the digital interface, if smoothing is not applied.
The receiver of the interface contains a receiver buffer,which compensates for the introducedjitter.