Tesis previa a la obtención del Título de Ingeniero en Electrónica y ...
Tesis previa a la obtención del Título de Ingeniero en Electrónica y ...
Tesis previa a la obtención del Título de Ingeniero en Electrónica y ...
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Level<br />
-127<br />
-126<br />
-2<br />
-1<br />
0<br />
1<br />
2<br />
3<br />
4<br />
5<br />
56<br />
57<br />
58<br />
59<br />
60<br />
125<br />
126<br />
127<br />
1<br />
-255<br />
-253<br />
-5<br />
-3<br />
0<br />
3<br />
5<br />
7<br />
9<br />
11<br />
113<br />
115<br />
117<br />
119<br />
121<br />
251<br />
253<br />
255<br />
2<br />
-509<br />
-505<br />
—9<br />
-5<br />
0<br />
5<br />
9<br />
13<br />
17<br />
21<br />
225<br />
229<br />
233<br />
237<br />
241<br />
501<br />
505<br />
509<br />
3<br />
-765<br />
-759<br />
-15<br />
-9<br />
0<br />
9<br />
15<br />
21<br />
27<br />
33<br />
339<br />
345<br />
351<br />
357<br />
363<br />
753<br />
759<br />
765<br />
4<br />
-1019<br />
-1011<br />
-19<br />
-11<br />
0<br />
11<br />
19<br />
27<br />
35<br />
43<br />
451<br />
459<br />
467<br />
475<br />
483<br />
1003<br />
1011<br />
1019<br />
Recoustruction levéis (REC)<br />
QUANT<br />
8<br />
-2039<br />
-2023<br />
-39<br />
-23<br />
0<br />
23<br />
39<br />
55<br />
71<br />
87<br />
903<br />
919<br />
935<br />
951<br />
967<br />
2007<br />
2023<br />
2039<br />
9<br />
-2048<br />
-2048<br />
-45<br />
-27<br />
0<br />
27 •<br />
45<br />
63 -<br />
81<br />
99<br />
1017 •<br />
1035<br />
1053<br />
1071<br />
1089<br />
2047<br />
2047<br />
2047<br />
17<br />
-2048<br />
-2048<br />
-85<br />
-51<br />
0<br />
51<br />
85<br />
119<br />
153<br />
187<br />
1921<br />
1955<br />
1989<br />
2023<br />
2047<br />
2047<br />
2047<br />
2047<br />
18<br />
-2048<br />
-2048<br />
-89<br />
-53<br />
0<br />
53 •<br />
89 •<br />
125 •<br />
161<br />
197<br />
2033<br />
2047<br />
2047 •<br />
2047<br />
2047<br />
2047 -<br />
2047<br />
2047<br />
Note -Reconstruction levéis are symmetrical \vith respect to the sign of level except for 2047/-2048.<br />
For INTRA blocks the íirst coeffici<strong>en</strong>t is<br />
30<br />
-2048<br />
-2048<br />
-149<br />
-89<br />
0<br />
89<br />
149<br />
209<br />
269<br />
329<br />
2047<br />
2047<br />
2047<br />
2047<br />
2047<br />
2047<br />
2047<br />
2047<br />
31<br />
-2048<br />
-2048<br />
-155<br />
-93<br />
0<br />
93<br />
155<br />
217<br />
279<br />
341<br />
2047<br />
2047<br />
2047<br />
2047<br />
2047<br />
2047<br />
2047<br />
2047<br />
nominally the transform <strong>de</strong> valué linearly quantized<br />
with a step size of 8 and no <strong>de</strong>ad-zone. The resulting valúes are repres<strong>en</strong>ted with 8 bits. A nominally b<strong>la</strong>ck block will<br />
give 0001 0000 and a nominally white one 1110 1011, The co<strong>de</strong> 0000 0000 is not used. The co<strong>de</strong> 1000 0000 is not<br />
used, the reconstruction level of 1024being co<strong>de</strong>d as 1111 1111 (see Table 6/H.261).<br />
Coeffici<strong>en</strong>ts añer the <strong>la</strong>st non-zero one are not transmitted. EOB (<strong>en</strong>d of block co<strong>de</strong>) is always the <strong>la</strong>st Ítem in<br />
blocks for which coeffici<strong>en</strong>ts are transmitted.<br />
4.3 Mitltipoint consi<strong>de</strong>rations<br />
The following facilities are provi<strong>de</strong>d to support switched multipoint operation.<br />
4.3,1 Freeze picture request<br />
Causes the <strong>de</strong>co<strong>de</strong>r to freeze its disp<strong>la</strong>yed picture until a freeze picture reléase signa! is received or a timeout<br />
period of at least six seconds has expired. The transmission of this signal is via external means (for example by<br />
Recomm<strong>en</strong>dation H.221).
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