| 词条 | Digital Terrestrial Multimedia Broadcast |
| 释义 |
DTMB (Digital Terrestrial Multimedia Broadcast) is the TV standard for mobile and fixed terminals used in the Mainland China, Cuba, Hong Kong and Macau. {{TOClimit|limit=3}}OverviewPreviously known as DMB-T/H (Digital Multimedia Broadcast-Terrestrial/Handheld), the DTMB is a merger of the standards ADTB-T (developed by the Shanghai Jiao Tong University), DMB-T (developed by Tsinghua University) and TiMi (Terrestrial Interactive Multiservice Infrastructure); this last one is the standard proposed by the Academy of Broadcasting Science in 2002. At first, neither Shanghai Jiao Tong University nor Tsinghua had enough political strength to make their own technology become the unique standard, so the final decision was to opt for a double standard, merged with the TIMI 3 standard, responding to a need for backward compatibility. The DTMB was created in 2004 and finally became an official DTT standard in 2006. DTMB in China
DTMB channel available in China
Main channel of province TV in each province
DTMB in Hong Kong{{main|Television in Hong Kong#Digital television}}
DTMB in Macau
Versus CMMBSee China Multimedia Mobile Broadcasting (CMMB).Countries and territories using DTMBAsia
Middle East
North America
DescriptionBesides the basic functions of traditional television service, the DTMB allows additional services using the new television broadcasting system. DTMB system is compatible with fixed reception (indoor and outdoor) and mobile digital terrestrial television.
ModulationThe DTMB standard uses many advanced technologies to improve their performance, for example, a pseudo-random noise code (PN) as a guard interval that allows faster synchronization system and a more accurate channel estimation, Low-Density Parity Check (LDPC) for error correction, modulation Time Domain Synchronization - Orthogonal Frequency Division Multiplexing (TDS-OFDM) which allows the combination of broadcasting in SD, HD and multimedia services, etc. This system gives flexibility to the services offered to support the combination of single-frequency networks (SFN) and multi-frequency networks (MFN). The different modes and parameters can be chosen depending on the type of service and network's environment. The sequence of pseudo-random pattern is defined in time domain and the information of the Discrete Fourier transform (DFT) is defined in the frequency domain. The two frames are multiplexed in the time domain, resulting in Time domain synchronization (TDS). Functional schemeThis transmission system makes the conversion of the input signal to the output data of terrestrial TV signal. The data passes through the encoder, the error protection process FEC (Forward Error Correction), through the constellation mapping process and then the interleaving processes the information to create the data blocks. The data block and the TPS information are multiplexed, and pass through the data processor to form the body structure. It combines information from the body and the head to form the frame and this is passed through the SRRC (Square Root Raised Cosine) filter to become a signal within an 8 MHz channel bandwidth. Finally the signal is modulated to put it in the corresponding frequency band. Features
See also
References1. ^1 2 3 4 5 6 DTV Status. Retrieved May 30, 2012 2. ^http://www.info.gov.hk/gia/general/201412/09/P201412090656.htm 3. ^CNTV English. Retrieved March 21, 2013 Further reading
| last = Kumar | first = Amitabh | authorlink = Amitabh Kumar | title = Mobile TV: DVB-H, DMB, 3G Systems and Rich Media Applications | publisher = Focal Press | series = Focal Press Media Technology Professional Series | year = 2007 | doi = | isbn = 978-0-240-80946-5 }} External links
3 : Digital television|Science and technology in the People's Republic of China|Science and technology in Hong Kong |
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