Design and application considerations of IPTV set-top boxes

Market demand and technological development are driving this concept to evolve. Some models require video-on-demand (VOD) and TV multicast functions; some realize the bundling of TV and VoIP services; and many products require Internet browsing or have personal video recording functions, digital media adapters, or videophone functions.
　　
      Various additional functional business layers with different requirements and actual network deployment further bring more engineering challenges. The broadband data rate changes at any time, and the delay will also affect the duplex communication. Differences in the head-end video decoders will also bring about device interoperability issues. The equipment may be installed in a network beyond the control of the service provider, or may be part of a network that adopts low-level standards, subject to unbalanced QoS.
　　
     Today, a typical IPTV set-top box already has a series of conventional functions. The following tasks must be performed strictly in real time: receiving, processing, and decoding compressed voice/image data streams on the network, and sending them to listeners and viewers simultaneously. Similarly, digital rights management protection and conditional access (to ensure that only authorized users can receive programs) functions are also required. Therefore, from the beginning, it is necessary to carefully select the solution architecture and carry out a careful design.
　　
     should
　　
     1. Designed for multicast. Although the network uses the IP protocol, the duplex communication between the IPTV set-top box and the server is not specific. TV multicast requires set-top boxes to predict what programs will be available and when they will be broadcast without a dedicated communication support channel. In fact, when a set-top box is installed in a car or a portable system to provide satellite TV, there is no support channel available at all.
     Picture: Media Server 1

      2. Estimate the peak network load. Many media processors are limited by network processing capacity and efficiency. As a result, it will cause the loss of video frames and the interruption of VoIP calls. Many problems that are not obvious in the laboratory appear to be very prominent in the actual network.
　　
     3. Foresee the unpredictable. Orderly and predictable things are extremely rare in the application field. For example, network congestion will delay program streaming, wireless connection will also be interrupted, video streaming, VoIP voice streaming and large data streaming will compete for bandwidth, and sometimes these situations occur at the same time. When these situations are unavoidable, the ability to appropriately reduce service levels will help differentiate your design from your competitors.
　　
     4. Allow customers to customize the interface. For set-top boxes to be popularized, their design must allow service providers to customize user interfaces. At this time, appearance and feel are critical to adapting to a certain production line.
　　
      5. Have the ability to upgrade on site. For service providers, the cost of driving out to upgrade will be very high. Through software upgrades that can be implemented remotely on the network, such costs will be saved.
　　
Shouldn't
　　
    1. Assume that the data rate is constant. The nature of the service flow on the IP network is bursty and easily congested. Using memory buffers will compensate for network jitter, handle audio/video synchronization, and separate media streams from control processing signals.
　　
    2. It is assumed that all data can be received. Although the loss of data packets is a natural characteristic of the network, after all, the loss of video frames and voice data streams will affect the user experience. Many media systems cannot achieve loss concealment, and these are necessary for both audio and video.
　　
    3. Expect broadband throughput as advertised. And the data rate on different network segments is different. When compensating for various changes on the network, the content codec rate is lower than the throughput rate claimed by the network.
　　
    4. Use a decoder designed for fixed media. IPTV set-top boxes need to use decoders designed for communication systems that are bound to change.
　　
    5. Partition processing is too strict, which makes some new applications unable to use their processing power in new ways. Inflexible partitions can lead to a situation where although the design can perform IPTV functions well, the Internet browsing speed is slow and the effect is poor.

 

 

 

How far(long) the transmitter cover? The transmission range depends on many factors. The true distance is based on the antenna installing height , antenna gain, using environment like building and other obstructions , sensitivity of the receiver, antenna of the receiver . Installing antenna more high and using in the countryside , the distance will much more far. EXAMPLE 5W FM Transmitter use in the city and hometown: I have a USA customer use 5W fm transmitter with GP antenna in his hometown ,and he test it with a car, it cover 10km(6.21mile). I test the 5W fm transmitter with GP antenna in my hometown ,it cover about 2km(1.24mile). I test the 5W fm transmitter with GP antenna in Guangzhou city ,it cover about only 300meter(984ft). Below are the approximate range of different power FM Transmitters. ( The range is diameter ) 0.1W ~ 5W FM Transmitter ：100M ~1KM 5W ~15W FM Ttransmitter : 1KM ~ 3KM 15W ~ 80W FM Transmitter : 3KM ~10KM 80W ~500W FM Transmitter : 10KM ~30KM 500W ~1000W FM Transmitter : 30KM ~ 50KM 1KW ~ 2KW FM Transmitter : 50KM ~100KM 2KW ~5KW FM Transmitter : 100KM ~150KM 5KW ~10KW FM Transmitter : 150KM ~200KM How to contact us for the transmitter? Call me +8618078869184 OR Email me [email protected] 1.How far you want to cover in diameter ? 2.How tall of you tower ? 3.Where are you from ? And we will give you more professional advice. About Us FMUSER.ORG is a system integration company focusing on RF wireless transmission / studio video audio equipment / streaming and data processing .We are providing everything from advice and consultancy through rack integration to installation, commissioning and training.   We offer FM Transmitter, Analog TV Transmitter, Digital TV transmitter, VHF UHF Transmitter, Antennas, Coaxial Cable Connectors, STL, On Air Processing, Broadcast Products for the Studio, RF Signal Monitoring, RDS Encoders, Audio Processors and Remote Site Control Units, IPTV Products, Video / Audio Encoder / Decoder, designed to meet the needs of both large international broadcast networks and small private stations alike.   Our solution has FM Radio Station / Analog TV Station / Digital TV Station / Audio Video Studio Equipment / Studio Transmitter Link / Transmitter Telemetry System / Hotel TV System / IPTV Live Broadcasting / Streaming Live Broadcast / Video Conference / CATV Broadcasting system.   We are using advanced technology products for all the systems, because we know the high reliability and high performance are so important for the system and solution . At the same time we also have to make sure our products system with a very reasonable price.   We have customers of public and commercial broadcasters, telecom operators and regulation authorities , and we also offer solution and products to many hundreds of smaller, local and community broadcasters .   FMUSER.ORG has been exporting more than 15 years and have clients all over the world. With 13 years experience in this field ,we have a professional team to solve customer's all kinds of problems. We dedicated in supplying the extremely reasonable pricing of professional products & services. Contact email : [email protected] Our Factory We have modernization of the factory . You are welcome to visit our factory when you come to China. At present , there are already 1095 customers around the world visited our Guangzhou Tianhe office . If you come to China , you are welcome to visit us . 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