Interpretation of related terms in set-top boxes
Launcher is the desktop launcher in Android, and the desktop UI of Android is collectively called Launcher. Launcher is one of the main program components in Android system. If there is no Launcher in Android system, Android desktop cannot be started. When Launcher fails, Android system will display the prompt window "Process com.android.launcher stops unexpectedly". Restart the Launcher.
OSD, on-screen menu adjustment. Generally, it is a rectangular menu of various adjustment item information of the display popped up after pressing the Menu button, and the menu can be used to adjust various working indicators including color, mode, geometric shape, etc., thereby achieving the best use state. OSD is the abbreviation of On Screen Display. It is applied to CRT/LCD display to generate some special glyphs or graphics on the screen of the display, so that users can get some information. Commonly on the display screen of a home TV or a personal PC computer, when the user operates the TV to change channels or adjust the volume, picture quality, etc., the TV screen will display the current status to let the user know that the control IC can be in the fluorescent Any special glyphs and graphics are displayed anywhere on the screen to become an important message generating device on the human-machine interface.
OTT, the abbreviation of “Over The Top”, refers to providing various application services to users through the Internet. OTT TV is an abbreviation of "Over The Top TV", which refers to an open Internet-based video service. The terminal can be a television, a computer, a set top box, a PAD, a smart phone, and the like. It means providing services on the network, emphasizing the independence of services from the physical network. The content of the video programs transmitted via the Internet, such as PPS, UUSEE, etc., is transmitted to the display screen (including the television).
From the consumer's point of view, OTT TV is an Internet TV, a full-featured Internet TV that meets the needs of consumers and integrates interactive TV functions. OTT TV (Over-The-Top TV), an Internet TV serviced in Over-The-Top mode. Such as Apple TV and Google TV launched in the market in 2010 is this model.
Internationally, OTT TV refers to the convergence of IP video and Internet applications for TV transmission over the public Internet. The receiving terminal is an Internet TV integrated machine or a set-top box + TV set. In China, OTT TV refers to the controllable and manageable service of video content provided by state-owned broadcasters through the public Internet for television. The receiving terminal is generally a domestic Internet TV integrated machine.
DVB, the abbreviation for Digital Video Broadcasting, is a series of internationally recognized digital television public standards maintained by the DVB project. The DVB project is an industrial organization of more than 300 members. It is composed of the European Telecommunications Standards Institute (ETSI), the European Committee for Electrotechnical Standardization (CENELEC) and the European Broadcasting Union (EBU). ) Jointly formed by the Joint Expert Committee (JTC). These standards are freely available for download from the ETSI website after registration.
In 1993, Europe established the International Digital Video Broadcasting Organization (DVB Organization). The DVB organization decided that the new technology must be a digital technology built on MPEG-2 compression algorithms and must be market-oriented digital technology. The purpose of DVB is to design a universal digital TV system. The most simple way to convert between various transmission methods in this system is to increase the versatility as much as possible. The DVB standard provides a complete set of digital television system specifications for different media. The DVB digital broadcast transmission system utilizes all common television broadcast transmission media including satellite, cable, terrestrial, SMATV, MNDSD. They correspond to the DVB standards: DVB-S, DVB-C, DVB-T, DVB-SMATV, DVB-MS and DVB-MC.
TVOD (TV On Demand) is an extension of video live content. Let's take a look at what magical features TVOD will bring to everyone. TVOD refers to the IPTV system to record live TV programs in real time and store them as files; TV viewers can choose to watch TV programs played in the last few days at any time. In general, support for one week of review, the specific length of time to look back is determined by the capacity of the recording center node. The smaller the capacity of the central node, the shorter the time to look back.
TV viewing is different from TV on-demand. It is based on the time shift of TV programs. Therefore, viewers' content is still in the existing TV festival arrangement, and there is no significant change compared with traditional TV. The television viewing rate of the time-lapse period of TV viewing continues the arrival trend of traditional TV, with a slightly stable daytime and a clear peak at night.
IPTV is an interactive network TV. It is a brand-new technology that uses broadband networks to integrate Internet, multimedia, and communication technologies to provide home users with a variety of interactive services, including digital TV. It can adapt well to the rapid development of today's networks and make full and effective use of network resources.
DTV, Chinese means digital television, refers to the audiovisual system that compresses, encodes, transmits, stores, and transmits and broadcasts moving images, sounds and data through digital technology for audiences to receive/play. That is to say, this is a system that realizes digitization from program collection and production to program transmission and reception to the user terminal.
After years of debate over the previous scanning standards for ATV and DTV, the television industry has basically identified three systems: 480p, 720p, 1080i.
The online free TV subscription platform is a TV and media subscription service website based in the United States and the United Kingdom. It supports Internet media TV and local TV channels. It is very suitable for watching live broadcasts. Of course, there are many kinds of local stations, no copyright restrictions. Old movie interface.
The filmon website is very detailed, covering a wide range of sports, politics, life, entertainment, music, movies, etc., especially the live TV channel, which contains more than 200 free TV live channels, allowing users far away from all over the world. You can watch live local TV shows online.
Miracast is the Wi-Fi CERTIFIED MiracastTM certification program announced by the Wi-Fi Alliance on September 19, 2012.
Miracast devices provide simplified discovery and setup, allowing users to quickly transfer video between devices. The technology and certification program was developed by mobile and consumer electronics manufacturers and chip vendors in the Wi-Fi Alliance. Industry analysts expect the annual production of Miracast certified equipment to exceed 1 billion units in the next four years.
Miracast users can browse the photos taken by the smartphone on the big screen TV, share the notebook screen in real time through the conference room projector, or watch the live TV program of the home TV set-top box on the tablet. Miracast forms a connection via Wi-Fi CERTIFIED Wi-Fi DirectTM, so there is no need to connect to any Wi-Fi network - the Miracast certified device has connectivity inside.
Miracast supports the protection of content streams so that devices can receive movies and other copyrighted material. To protect premium content, Miracast wirelessly adapts today's trusted content protection mechanisms that are widely used in wired interfaces such as HDMI® and DisplayPort. In addition, each device automatically enables the new WPA2TM security protection to ensure the confidentiality of all multimedia content transmission.
The technology used by Miracast was developed by a team from Wi-Fi Alliance mobile and customer electronics manufacturers and chipmakers to standardize on simplified video sharing. According to the Wi-Fi Alliance display specifications, the product includes interoperability between different brands of Miracast vendors, making it easy for users to enjoy videos on the big screen at home or in the office.
DLNA's full name is DIGITAL LIVING NETWORK ALLIANCE, its purpose is Enjoy your music, photos and videos, anywhere anytime, DLNA (Digital Living Network Alliance) initiated by Sony, Intel, Microsoft, etc., aimed at solving individuals The interconnection of wireless networks and wired networks, including PCs, consumer electronics, and mobile devices, has made it possible to unrestricted sharing and growth of digital media and content services. Currently, there are more than 280 member companies.
DLNA is not about creating technology, but about forming a solution, a specification that everyone can follow. Therefore, the various technologies and protocols selected by them are widely used technologies and protocols.
DLNA defines its entire application as five functional components. From bottom to top are: network interconnection, network protocol, media transmission, device discovery control and management, media format.
Universally Unique Identifier
LNB is also called the down converter, commonly known as the high frequency head, used to convert the DVBS satellite signal to 950MZ to 2150MZ and transmit it to the TUNER inside the satellite receiver. TUNER completes the amplification and demodulation work.
Since the satellite downlink microwave signal received by the terrestrial antenna in the satellite television receiving system has been transmitted over a long distance of about 40 000 km, the function of the down converter is to receive the original signal quality parameter. The signal of the satellite downlink frequency is subjected to low noise amplification and frequency conversion.
The role of Lnb (1): frequency selection (2): amplification (3): frequency conversion
Tuner is a variable frequency chip used in the front end of the demodulation chip
The front end TUNER is a tuning operation, tuning to a specific frequency, converting the input high frequency into a stable intermediate frequency, and converting it to a demodulator through AD, and the demodulator then decomposes the intermediate frequency into a TS stream according to the carrier parameter to the CPU.
Satellite, cable, terrestrial TV tuner can be classified according to the scope of application
Mainly used in digital TV technology and standards using coaxial cable as transmission medium, using VHF/UHF carrier, using 64-QAM modulation (QAM16-QAM/32-QAM/64-QAM, etc.), QAM quadrature amplitude modulation ( Quadrature Amplitude Modulation)
Mainly used in digital TV technology and standards using satellite as transmission medium, using SHF carrier, using QPSK modulation, QPSK Quadrature Phase Shift Keying
Compared with DVB-S, there are more modulation methods, such as QPSK, 8PSK, 16APSK, 32APSK;
Mainly used in digital TV technology and standards using terrestrial microwave communication as transmission medium; using VHF and UHF carriers, using OFDM (Orthogonal Frequency Division Multiplexing) modulation
Europe: C-OFDM coded orthogonal frequency division multiplexing
China: TDS-OFDM Time Domain Synchronous Orthogonal Frequency-Division Multiplex
Japan: BST-OFDM Band Segmented Transmission Orthogonal Frequency Division Multiplexing (OFDM)
Currently used in Japan and South America
Is the second generation of European digital terrestrial television broadcasting transmission standard
Using OFDM technology, combined with advanced LDPC coding and time domain and frequency domain two-dimensional interleaving technology, the system's frequency band utilization and ease of use are improved, and the service function of the broadcast television network will be greatly expanded.