, . . ( , ) .
, , SDH-: , , - , .
, , : - , . :
, : , .., - , ;
( ), HFC-.
, , , , .
32 4 QAM-64 , . , , , DVB-C-, . - , EuroDOCSIS. QAM-64 . .
, , .
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(. . 9.2), Video- Audio-, MPEG-2 , DVB-ASI . DVB-ASI DVB-S DVB-T .
, CI- .
DVB-ASI , DVB-ASI/DS3-G.703 SDH-.
SDH- DS3 44,736 /. , , MPEG-2 , 5 6 /. , DS3 7-8 . 32 4 , , 4 .
32 , , DS3 , QAM-64 . , (. . 9.3).
SDH- "" DS3 . , , .
( SDH-c - HFC- - . . 9.4) : SDH- DS3-G.703/DVB-ASI, QAM- (: 47-862 ).
, DVB-ASI 32 ASI- (: Video- Audio-), , , / RF- (47-862 ). , , 1- . , .
. 9.2. DVB-C ()
. 9.3. DVB-C ()
, IP-, , ( ..) .
IP- ( ..) , .
. 9.4. DVB-C ()
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, , , , , ROSA. 1, . : , , 1 16 . ROSA ( ) , :
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:
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, , / ( 30 ) . , , . - , .
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9.4
, / | , / | , / | |
16- | 6,89 | 27,56 | 25,2 |
32- | 6,92 | 34,60 | 31,9 |
64- | 6,84 | 41,04 | 38,9 |
. 9.4 , (. . 9.3), , .
, .
1. .
2. MPEG-2 .
3. DVB. . 8. , .. 0x47 08. .
4. . , .
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5. -. 188 204.
6. .
7. . , 64- 64- 3 4 .
8. .
9. , I Q. - , .
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. 9.5.
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II.
1. |
Eureka-147
IBOC
ISDB
DVB
DARS
DRM
1.7. DAB+
Eureka-147
DAB (Digital Audio Broadcasting) Eureka-147 DVB. , DAB-T. DAB-T 1995 ., DBV-T.
DAB-T DVB-T .
MPEG 1/2 II MUSICAM, , , - COFDM. DAB , DVB, . 1.536 , 1.2 1.5 / ( ). 8 384 /, DAB ( 5 20) .
DAB-T . , , , DAB III (174-230 ), , , , L- (1452-1492 ).
9 DAB- , DAB . , /.
DAB-T , , . DAB, , .
DAB . DAB-T , FM- . DAB-T , DAB-, . , . DAB , FM-, RDS (radio data system). , , .
DAB- 20- " " , c -. " ", . , , . , , , - .
DAB- , , , DAB-.
.
-, DAB . , DAB . , , . DAB- $100.
DAB- . , DAB- , DAB .
, DAB- , , , DAB.
DAB DAB-. . , , , DAB- 174-230 . , . , , .
1999 . 15- , DAB. DAB-, DAB-. DAB, ( ) .
, , , . , . , DAB- .
DAB- . -, , , -, , , . , DAB , DAB . , (IP-, , , ), (MHP, TV-Anytime). WorldDAB Forum, Eureka-147, . , DAB- 30-40 %, .
DAB Forum IP DAB, DAB IP- . DAB , IEEE 802.11, , . IP/DAB - MPEG-4 Windows Media -9. DAB- . MHP .
DAB . , , DAB- , SMS. . , , DAB- . . . , DAB- . , - .
, , , . , .
DAB- : SC (Synchronisation Channel) FIC (Fast Information Channel) MSC (Main Information Channel). SC- , (. 1.1).
. 1.1. DAB-
FIC, FIBs (Fast Information Blocks) , , MCS. MCI (Multiplex Configuration Information), . FIC SI (Servise Information), (CA) FIDC (Fast Information Data Channel). MCI, FIC , .
MSC DAB-. , , , . MSC , .
MSC : . , , , .
.
MSC , .
IBOC
IBOC DAB. Eureka-147 , . - " " , " " . 100 , , 50 (. 1.2).
, , .
, Eureka-147 MPEG , COFDM /QPSK. IBOC . , , . . mp3 .
. 1.2. IBOC
ISDB
, ISDB, -. ISDB , DVB, . - , . , Eureka-147.
DVB
DVB . , , DAB, DVB-T/S/C. , , . , , . DAB, "" , "" .
DARS
, , , : XM Satellite Radio Sirius Satellite.
1992 ., FCC S-. , . 12.5 , 100 .
$100.
Radio 2001 . . 2 , $10. , M- 21 . , . , , .
XM- Roll Rock, , , , . , , , , . , , , , , , .
XM Radio, - . General Motors, $100 AM/FM/XM.
3 , . , Sirius - . , QPSK-, COFDM-.
, . Sisrius , XM Radio CT-aacPlus, AAC Spectral Band Replication (SBR), Coding Technologies.
, .
. , , c .
, , . , 40 96 16 .
WorldSpace 2 , , . . , 40 - . L- ( 1.45-1.49 ) DQPSK- MPEG 2.5 3.
, . (TDM), FDM-, .
1998 ., , : 350 000 . World Space , , . , , .
DRM
DRM (Digital Radio Mondiale) 1998 ., 80- . DRM, 60- . " ", , , .
DRM 30 , . , , , . . . DRM, DAB, , . DRM 9-10 . DRM- (4.5-5 ) (18-20 ) .
DRM, , COFDM. , , , , MPEG -4 AAC SBR, .
DRM- .
, , .
, . DRM , , , , . . , , DRM . , . .
DRM , , .
DRM DAB , . , . DAB-DRM.
1.7. DAB+
MPEG-4 High Efficiency AAC MPEG AAC SBR Bandwidth Extension. SBR (Spectral Band Replication), Coding Technologies. MPEG, MPEG-4, High-Efficiency AAC DAB DAB+..
MPEG-4 High Efficiency AAC (HE-AAC) AAC, , MPEG-4 . High Efficiency AAC AAC, AAC SBR. , MPEG-4.
SBR , . High Efficiency AAC CD- 48 / 5.1 surround 128 /. .
. 2.5G 3G . . , 144 /, 40 /. . HE-AAC , . HE-AAC 48 / -, 32 / , . , .
. High-efficiency AAC . , , HE-AAC , , 5.1 Surround. Spectral Band Replication (SBR) MPEG-2, HE-AAC MPEG-2 MPEG-4.
. . , , - . MPEG-4 , .
, HE-AAC AAC , .
SBR. SBR, Spectral Band Replication, Coding Technologies , MPEG Layer-3 (MP3) MPEG AAC. SBR , , . MPEG-4 Audio SBR AAC, High-efficiency AAC, aacPlus Coding Technologies.
, SBR - .
SBR, , , AAC. , HE-AAC .
, HE-AAC 48 / : MPEG AAC 42 / SBR 6 /. SBR MPEG AAC , MPEG-4, MPEG-4 HE-AAC 48 / (. 1.3).
.1.3. MPEG-4 HE AAC ( SBR AAC)
SBR AAC, AAC, HE-AAC. AAC, . HE-AAC, (SBR AAC) . AAC. , HE-AAC AAC, , AAC, High Efficiency AAC MPEG-4 Audio. HE-AAC AAC.
DAB + :
-
, MPEG
Audio
on-line
IP.
, , DAB DRM.
2. | DAB |
2.1.
2.2.
2.3.
2.4.
2.5.
2.6.
Eureka-147/DAB T-DAB 1995 1997 . ETS 300 401. T-DAB BS.1114-1 .