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| Adaptation Field |
| Ancillary program data (especially PCR) which are uncoded and are transmitted at least every 100ms acc. to MPEG2 or 40 ms acc. to DVB specifications. |
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| Pixel Block |
| 8x8 pixel block, MPEG2 coded. |
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| CA |
Conditional Access
Information of whether the program is scrambled. |
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| CAT |
Conditional Access Table (PID=0x01)
Reference to scrambled programs.
Table ID 0x01 |
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| CIF |
Common Intermediate Format
Picture format |
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| CRC |
| Cyclic Redundance Check |
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| DCT |
| Discrete Cosine Transform |
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| DCT-1 / IDCT |
| Inverse Discrete Cosine Transform |
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| DFD |
Displaced Frame Indifference
Differential picture if there is motion. |
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| DPCM |
| Differential Pulse Code Modulation |
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| DTS |
Decoding Time Stamp
Stamp for decoding time, only transmitted if not identical with PTS; reference to PID. |
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| ES |
Elementary Stream
Compressed data stream for video, audio or data. Preliminary stage to PES. |
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| GOP |
| Group of Pictures |
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| I, P and B pictures |
| Intra-coded pictures (I), predicted pictures (P) and bi-directional predicted pictures (B). |
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| IRD |
Integrated Receiver Decoder
Receiver with (MPEG) decoder. |
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| MPEG |
| Motion Picture Experts Group sometimes called Moving Picture Experts Group |
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| MUSICAM |
Masking Pattern Adapted Universal Subband Integrated Coding and Multiplexing
Compression method for audio coding |
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| PAT |
Programm Association Table (PID=0x00)
List of all the programs contained in TS Multiplex with reference to PID of PMT.
Table ID 0x00 |
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| Payload |
| Useful Data in TS |
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| PCM |
| Pulse Code Modulation |
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| PCR |
Programm Clock Reference
Reference in TS for the 27-MHz clock recovery. Transmitted at least every 0.1 sec |
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| PES |
Packetized Elementary Stream
Video and audio data packets and ancillary data of definable length. |
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| PES Header |
| Ancillary data for an elementary stream. |
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| PID |
Packet Identifier
Identification of programs in the transport stream. |
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| PMT |
Program Map Table
Reference to packets with PCR
Name of programs, copyright, reference of the data streams with PIDs etc. belonging to the relevant program.
Table ID 0x02 |
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| Prediction |
| Prediction of a picture (P or B) with indication of a motion vector. |
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| Profile |
| Subdivision of video coding into different resolutions. |
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| PS |
Program Stream
Multiplex of several audio and video PES using the same clock. |
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| PSI |
Program Specific Information
Data transmitted in TS for the demultiplexer in the receiver. (eg PAT, PMT, CAT) |
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| PTS |
Presentation Time Stamp
Time stamp for vision and sound, transmitted at least every 0.7 sec., integrated into PES. |
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| Q |
| Quantization |
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| Q-1 |
| Inverse quantization |
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| Q-1 |
| Inverse quantization |
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| QS |
| Quantization scaling |
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| RLC |
Run Length Coding
Coding of data with different number of bits. Frequently reoccurring data has the smallest number of bits, data seldom reoccurring have the highest number of bits. |
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| Section |
| A table is subdivided into several sections. If there is a change, only the section affected is transmitted. |
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| SIF |
| Source Input Format |
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| SCR |
System Clock Reference
27MHz Reference in ES for synchronizing the system demultiplex clock in the receiver. |
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| STC |
System Time Clock
27-MHz clock regenerated from PCR for a jitter-free readout of MPEG data. |
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| SYNC (_byte) |
| Synchronization byte in TS header value 0x47 |
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| TS |
| Transport Stream |
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| TS Header |
| The first 4 bytes of each TS packet contain the data (PID) required for the demultiplexer in addition to the sync byte (0x47). These bytes are never scrambled. |
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| VBR |
| Variable Bit Rate |
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| VLC |
Variable Length Coding
Coding of data with variable number of bits (also see RLC). |
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| ZigZag Scan |
| Zigzag scan of quantized DCT coefficient matrix. This gives an efficient run length coding (RLC). |