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 sistemas, Systems

 ATSC

DVB-T 

DVB-T2 

ISDB-T 

ISDB-Tb 

 Modulation

Modulación

 8VSB

 OFDM

1/2, 2/3 ,3/4, 5/6 ,7/8

 Low-density parity-check code+ BCH coding

1/2, 2/3, 3/5, 4,5, 5/6

COFDM (BST-OFDM (Segmented structure OFDM - 13 segments

1/2, 2/3, 3/4, 5/6, 7/8

Convolutional Coding + Reed Solomon

 COFDM (BST-OFDM (Segmented structure OFDM - 13 segments

 

1/2, 2/3, 3/4, 5/6, 7/8

Convolutional Coding + Reed Solomon

 MODES/Modos

QAM64 (over cable) sobre cable

QSPK,16QAM,64QAM

 QSPK,16QAM,

64QAM,256QAM

 QPSK, 16QAM, 64QAM, DQPSK ((Hierarchical transmission))

 QPSK, 16QAM, 64QAM, DQPSK ((Hierarchical transmission))

 Guard Interval

Intervalo de Señal de Guarda

 

 1/4, 1/8, 1/16, 1/32

 1/4,19/128, 1/8, 19/256, 1/16, 1/32, 1/128

 1/4, 1/8, 1/16, 1/32

 1/4, 1/8, 1/16, 1/32

 FFT SIZE/Tamaño del FFT

 

 2K, 8K

 1K,2K,4K,8K,16K,32K

 

 

 Scattered Pilots

 

 8% In Total

 1%,2%,4%8% in total

 

 

 Continual pilots

 

 2,6% of Total

 0,35% of total

 

 

 Typical data rate (UK) or (USA)

 19,39Mbit/s

 24Mbit/s

 40Mbit/s

19.94Mbits/S

 14.40Mbits/S

 Max data rate(@20dbC/N)

 

 29Mbit/s

 47,8Mbit/s

 25,7Mbit/s

 

Required C/N ratio (@22Mbit/s)

 

16,7dB

 8,9dB

 20,3dB

 

 Interleaving

 

 

 

 Time, Frequency, bit, byte

 Time, Frequency, bit, byte

 Video Codec

 MPEG2

 MPEG2-4

MPEG 2-4 

 MPEG2

MPEG4 AVCHD H264 

 Audio Codec

 ac3 Dolby Digital

 MPEG2

MPEG2 

MPEG2 AAC 

MPEG4 AAC, SBR, HE, LC (Mobile, Movil) 

 Band Usage

VHF2-UHF 

VHF2-UHF 

VHF2-UHF 

VHF2-UHF 

VHF2-UHF 

 Bandwidth

 6MHZ

7-8MHZ 

7-8MHZ 

6MHZ 

6MHZ