參數(shù)資料
型號(hào)： H.261
廠商： Electronic Theatre Controls, Inc.
英文描述： LINE TRANSMISSION OF NON-TELEPHONE SIGNALS
中文描述： 線傳輸非電話信號(hào)
文件頁數(shù)： 23/31頁
文件大?。?/td> 123K
代理商： H.261
20
Recommendation H.261 (03/93)
Reconstruction levels (REC)
For INTRA blocks the first coefficient is nominally the transform dc value linearly quantized with a step size of 8 and no
dead-zone. The resulting values are represented with 8 bits. A nominally black block will give 0001 0000 and a nominally
white one 1110 1011. The code 0000 0000 is not used. The code 1000 0000 is not used, the reconstruction level of 1024
being coded as 1111 1111 (see Table 6).
Coefficients after the last non-zero one are not transmitted. EOB (end of block code) is always the last item in blocks for
which coefficients are transmitted.
4.3
Multipoint considerations
The following facilities are provided to support switched multipoint operation.
4.3.1
Freeze picture request
Causes the decoder to freeze its displayed picture until a freeze picture release signal is received or a timeout period of at
least six seconds has expired. The transmission of this signal is via external means (for example by Recommendation H.221).
4.3.2
Fast update request
Causes the encoder to encode its next picture in INTRA mode with coding parameters such as to avoid buffer overflow. The
transmission method for this signal is via external means (for example by Recommendation H.221).
Level
1
2
3
4
ξ
QUANT
8
9
ξ
17
18
ξ
30
31
127
126
255
253
509
505
765
759
1019
1011
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
2039
2023
2048
2048
ξ
00
45
00
27
0000
0
000
27
000
45
000
63
000
81
000
99
ξ
0
1017
0
1035
0
1053
0
1071
0
1089
ξ
0
2047
0
2047
0
2047
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
2048
2048
ξ
00
85
00
51
0000
0
000
51
000
85
00
119
00
153
00
187
ξ
0
1921
0
1955
0
1989
0
2023
0
2047
ξ
0
2047
0
2047
0
2047
2048
2048
ξ
00
89
00
53
0000
0
000
53
000
89
00
125
00
161
00
197
ξ
0
2033
0
2047
0
2047
0
2047
0
2047
ξ
0
2047
0
2047
0
2047
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
2048
2048
2048
2048
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
00
2
00
1
000
0
000
1
000
2
000
3
000
4
000
5
00
5
00
3
000
0
000
3
000
5
000
7
000
9
00
11
00
9
00
5
000
0
000
5
000
9
00
13
00
17
00
21
0
15
00
9
000
0
000
9
00
15
00
21
00
27
00
33
00
19
00
11
0000
0
000
11
000
19
000
27
000
35
000
43
00
39
00
23
0000
0
000
23
000
39
000
55
000
71
000
87
0
149
00
89
0000
0
000
89
00
149
00
209
00
269
00
329
0
155
00
93
0000
0
000
93
00
155
00
217
00
279
00
341
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
00
56
00
57
00
58
00
59
00
60
0
113
0
115
0
117
0
119
0
121
0
225
0
229
0
233
0
237
0
241
0
339
0
345
0
351
0
357
0
363
00
451
00
459
00
467
00
475
00
483
00
903
00
919
00
935
00
951
00
967
0
2047
0
2047
0
2047
0
2047
0
2047
0
2047
0
2047
0
2047
0
2047
0
2047
ξ
ξ
ξ
ξ
ξ
ξ
ξ
ξ
0
125
0
126
0
127
0
251
0
253
0
255
0
501
0
505
0
509
0
753
0
759
0
765
0
1003
0
1011
0
1019
0
2007
0
2023
0
2039
0
2047
0
2047
0
2047
0
2047
0
2047
0
2047
NOTE – Reconstruction levels are symmetrical with respect to the sign of level except for 2047/
2048.
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