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H.261

Model	H.261
Description	LINE TRANSMISSION OF NON-TELEPHONE SIGNALS
PDF file	Total 31 pages (File size: 126K)
Chip Manufacturer	ETC

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TABLE 1/H.261

VLC table for macroblock addressing

MBA

011

010

0011

0010

0001

0000

Code

MBA

MBA stuffing

Start code

0000

Code

0101

0100

0011

0001

0000

011

010

001

000

111

110

101

100

011

010

001

000

111

0000

111

110

1011

1010

1001

1000

0111

0110

0101

0001

4.2.3.2

Type information (MTYPE) (Variable length)

Variable length codewords giving information about the macroblock and which data elements are present. Macroblock types,

included elements and VLC words are listed in Table 2.

MTYPE is always included in transmitted macroblocks.

4.2.3.3

Quantizer (MQUANT) (5 bits)

MQUANT is present only if so indicated by MTYPE.

A codeword of 5 bits signifying the quantizer to be used for this and any following blocks in the group of blocks until

overridden by any subsequent MQUANT.

Codewords for MQUANT are the same as for GQUANT.

Recommendation H.261

(03/93)

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