Definition of Terms - Digital Video and Audio Broadcasting Technology - page 557

Cyclic Redundancy Check (CRC)
The CRC serves to verify whether data transmission was error-free. To
this effect, a bit pattern is calculated in the transmitter based on the data to
be monitored. This bit pattern is added to the data in such a way that an
equivalent computation in the receiver yields a fixed bit pattern in case of
error-free transmission after processing of the data. Every transport stream
contains a CRC for the PSI tables (PAT, PMT, CAT, NIT) as well as for
some SI tables (EIT, BAT, SDT, TOT).
Decoding Time Stamp (DTS)
The DTS is a 33-bit value in the PES header and represents the decod-
ing time of the associated PES packet. The value refers to the 33 most sig-
nificant bits of the associated program clock reference. A DTS is only
available if it differs from the presentation time stamp (PTS). For video
streams this is the case if delta frames are transmitted and if the order of
decoding does not correspond to that of output.
Digital Audio Broadcasting
A standard for digital radio in VHF band III, and the L band, defined as
part of the EUREKA Project 147. The audio is coded to MPEG-1 or
MPEG-2 Layer II. The modulation method used is COFDM with DSPSK
modulation.
Digital Multimedia Broadcasting Terrestrial (DMB-T)
Chinese standard for digital terrestrial television.
Digital Radio Mondiale
Digital standard for audio broadcasting in the medium- and short-wave
bands. The audio signals are MPEG-4 AAC coded. The modulation
method used is COFDM.
Digital Storage Media Command and Control (DSM-CC)
Private sections according to MPEG-2 which are used for the transmis-
sion of data services in object carousels or for datagrams such as IP pack-
ets in the MPEG-2 transport stream.
Digital Video Broadcasting (DVB)
The European DVB project stipulates methods and regulations for the
digital transmission of TV signals. Abbreviations such as DVB-C (for
transmission via cable), DVB-S (for transmission via satellite) and DVB-T
(for terrestrial transmission) are frequently used as well.
Data Download Block (DDB)
Data transmission blocks of an object carousel, logically organized into
modules.
Download Information Identification (DII)
Logical entry point into modules of an object carousel.
Download Server Initializing (DSI)
Logical entry point into an object carousel.