;
() ;
.
, .
( ) 1-11 6-10, III - 25, IV-V - 50.
, () . 0,9 .
, .
; () () . , , , , , . , .
, ( ), ( ) . .
, ( ) , (, 8 ). 12-15, - . , - .
, .. . , ( , , - . .).
|
|
.
DVB-T , , . ATV1 (. 5.9).
. 5.9. ATV-1
. 5.2 ATV-1.
5.2
16 |
9 | |
1,15 | |
2 | |
75(50) | |
25 |
6. | DVB-T |
6.1.
6.1.1
6.1.2
6.1.3
6.2.
6.2.1
6.2.2 DVB- ELTI
6.1.
, , : . , , . , , . (), , - . , , , , .
:
() ;
;
.
, , .
"" , ( ). . , . . 30 , , 30% , .
|
|
, .
1% , , , ( ). , . , . , .
6.1.1 . , . (MB) , , 100 ( 1-5).
, . 96% .
. , , () . MB.
/ (/) . , , , , . / 6 24 [1]; 64-QAM 5/6 / = 22,7 .
/; / = 36 , , / = 30 .
. 6.1 :
;
/ = 36 / = 30 ;
;
, 25 /: , 70% 95% . 8 ( 1 , , ). , . 6.1 .
|
|
. 6.1 , ( 90- . ) , , 1950- .
6.1
I | III | IV-V | ||
(1960- ) | ||||
/=36 | 48-49 | 52-54 | 60-64 | |
/=30 | 42-43 | 46-48 | 54-58 | |
. 417 | 58-64 | |||
40-42 | 48-52 | |||
64-QAM, 5/6 | 70% | 54-45 | 51-55 | |
95% | 49-51 | 57-61 |
, , (. . 6.1), . , 95% .
6.1.2 . 4 , . . 180 , , 5 , 1,25 .
. 6.1 MB ( 200 ) ( 500 ), 5 .
64-QAM-5/6 95% (51 MB, 38 IV 34 V ). ( / = 36 ) III MB 5 , (62 ). , , 47 //, 3 , 70% (. . 6.1). : 43 // IV 42 // V.
( 6 9 ); , , 15%, - 5% .
, |
|
|
. 6.1.
MB
, MB , . - ( ), MB, "" " ", .
MB , .
. 6.2 , III 16-QAM, , QPSK. , .
6.1.3 . , ( ) , , .
50% |
100% |
150% |
200% |
8 5 |
9 1,25 |
27 1,25 |
40 1,25 |
250% |
QPSK 1/2 |
QAM-16 3/4 |
QAM-64 5/0 |
. 6.2.
, 50% , / = 36 ( ). , , ( , - 30 ). . , , , 50%. ( ) .
. 6.3 ( ) . , 95% 9 , 70% - 2,9 .
-30 |
-20 |
-10 |
.6.3
( )
, 95% 8 , 50% .
: 95% ? .
. 6.4 .
, 60 80 , -- . , , 70% . ( 95% ) 6 (). , , , / 6 () . .
|
|
. 6.4.
6.2.
6.2.1 . , . , " ".
DVB-T, . , , DVB-T.
, DVB-T, . , .
, , .
DVB-T . , DVB-T, ( ), , . , (. 6.5).
VP |
. 6.5
. , ( ) , . , , :
;
;
- (. 6.6).
. 6.6. |
, . : (single-frequency network - SFN) 8K ¼ (. 6.7).
. 6.7. |
:
, -, ;
MER 33 ;
, FEC . , , (.6.8);
. 6.8 |
(. 6.9).
. 6.9.
. , ;
. SFN (10 1 PPS). (.6.10);
.6.10.
, MER DVB-T, . , DVB-T, .
Harris Broadcast Europe Spot - , (. 6.11). Harris , .
, Spot , . , Spot , .