 | This articleneeds additional citations forverification. Please helpimprove this article byadding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Digital Terrestrial Multimedia Broadcast" – news ·newspapers ·books ·scholar ·JSTOR(May 2023) (Learn how and when to remove this message) |
| List ofdigital television broadcast standards |
|---|
| DVB standards(countries) |
| ATSC standards(countries) |
|
| ISDB standards(countries) |
| DTMB standards(countries) |
| DMB standard(countries) |
| Codecs |
|
| TerrestrialFrequency bands |
| SatelliteFrequency bands |
DTMB (Digital Terrestrial Multimedia Broadcast) (Chinese:数字地面多媒体广播) is thedigital TV standard for mobile and fixed devices, developed in thePeople's Republic of China. It is used there and in both of their special administrative regions (Hong Kong andMacau), and also inCambodia, theComoros,Cuba,East Timor,Laos andPakistan.[1] In Pakistan, as part of theChina–Pakistan Economic Corridor Project,ZTE Corporation will providePakistan Television Corporation collaboration across several digital terrestrial television technologies, staff training, and content creation, including partnerships with Chinese multinational companies in multiple areas, such as television sets and set top boxes, as a form of "International Cooperation".[2]
Previously known asDMB-T/H (Digital Multimedia Broadcast-Terrestrial/Handheld), the DTMB is a merger of the standards ADTB-T (developed by theShanghai Jiao Tong University), DMB-T (developed byTsinghua 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 officialDTT standard in 2006.
Main channel of province TV in each province
SeeChina Multimedia Mobile Broadcasting (CMMB).
As of August 2025[update], the following countries use the DTMB broadcast standard: neighbouring countries may also pick up DTMB signals due tosignal overspill.
| This sectiondoes notcite anysources. Please helpimprove this section byadding citations to reliable sources. Unsourced material may be challenged andremoved.(May 2023) (Learn how and when to remove this message) |
Besides 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.
The DTMB standard uses many advanced technologies to improve their performance. For example, apseudo-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 ofsingle-frequency networks (SFN) andmulti-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 theDiscrete Fourier transform (DFT) is defined in the frequency domain. The two frames are multiplexed in the time domain, resulting inTime domain synchronization (TDS).
This 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.
