Satellite radio systems are part of a larger group of broadcast media, which scholars digital multimedia Broadcasting or DMB. This digital transmission system is used to send data to several recipients, such as Radios, TV sets or mobile phones and Pdas. There are two different ways of using digital multimedia broadcasting-S-DMB, which is transmitted by satellite or T-DMB used terrestrial transmitters. The complexity of the field of digital multimedia broadcasting is huge. In all of the features and attributes that digital transmission, satellite radio is probably the most spectacular it attracted enormous interest and triggered intense competition between the two major radio stations, satellite radio, XM and Sirius. The development of satellite radio and other forms of digital transmission is spectacular, because it offers two main qualities that terrestrial channels are shortage of: quality and coverage. In the case of satellite radio, for example, the sound quality of satellite distribution is much bigger than AM or FM broadcasts as whistling noise and transmission are eliminated.
The technical characteristics of digital multimedia broadcasting-overview
If it refers to the television, satellite radio or mobile phone transmissions, transmission of digital media based on standard Eureka-147 DAB. Digital TV uses the T-DMB, which is made for broadcasts in the frequency bands III (VHF) and L (SHF). T-DMB is an ETSI TS 102 427-TS 102 428).
T-DMB used video MPEG-4 part 10 (H264) and MPEG-4 Part 3 company or he-AAC V2 for audio. When it comes to satellite radio, there are some problems to be solved by satellite radio stations. Satellite radio receiver must be in the line of sight to the satellite to receive the transmission-and there is the problem of having different objects landscaping block direct transmission. Terrestrial devices are installed to prevent the lack of direct broadcast satellite. The widest range of programming that will be addressed, digital media transmission using OFDM modulation-4DPSK and T-DMB receiver chip is also provided by the transport stream Multiplexer-MPEG-2. This helps reduce the negative note and fading effects in many digital transmissions.
The future of digital media broadcasting
Worldwide analog to digital transfer is evident in all areas of work. As the transmission of digital media is evolving very quickly, there is a silent fight between the current new era of classic analog and digital technology. Of course, many compare the passage was completely analog cassettes as digital audio are replaced by CDs and DVDs later, the same. Development of digital multimedia broadcasting is, however, slower, because it happens so levels at the same time. Digital television is in bringing new spaces, which are mainly hybrids and the characteristics of the features of Internet TV. Satellite radio is also huge leaps ahead with programs exclusive satellite radio. There is even talk of moving events like MLB exclusively on satellite radio to offer one of the first deadly attacks against the terrestrial broadcasters. Transfer of digital data is quickly and accurately, and far from reality proves the satellites used to help television and reliable. Most TV channels of digital multimedia satellites have also have backup ready to go into orbit and the replacement of a defective. Some other benefits of digital media broadcast is recommended as a step in the development of broadcasting. The perspective of consumers, the quality and the interactivity of the digital TV-radio broadcasts or satellite options are important features. Although most transmission channels of digital media and technologies still complex and expensive, sometimes, it seems the evolution of the digital broadcasting here to stay.
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