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New IPTV STB The formation of a rapidly evolving and changing product categories. Market demand and technology are driving the ongoing evolution of the concept. Some models requires a video on demand ( VOD ) And TV multicast; a number of TV and VoIP services to achieve a bundle; also has many products requires Internet browsing, or have personal video recording capabilities, digital media adapter or video phone functionality. Different needs of various additional features of the business layer, and the actual deployment of the network will bring more engineering challenges. Broadband data rates are subject to change, the delay will also affect the duplex Communicate . Video Headend Decoder The difference will also bring equipment interoperability issues. Equipment may be installed in the service provider can not control the network, may also adopt the lower standard as part of the network, which is subject to uneven QoS. Today, a typical IPTV set-top boxes already have a series of regular features. The following tasks have to be strictly real-time implementation: on the network, compressed voice / image data stream for receiving, processing and decoding, and simultaneously sent to the listeners and viewers. Similarly, need to have digital rights management protection and conditional access (to ensure that only authorized users can receive programs) function. Thus, from the beginning need to carefully select the program structure and design carefully. Should 1. Designed for multicast. Although the network using the IP protocol, IPTV set-top boxes and Server Duplex communication between not specific. TV set-top box required multicast communication support in the absence of specific channel conditions, to forecast what would be the program, and what time to play. In fact, when the set-top box is installed in your car or portable systems to provide Satellite TV , They did not support channels available. Figure: Media Server 1 2. Assess peak network load. Promise Multimedia Processor Are subject to network processing capacity and efficiency constraints. In this way, it will lead to the loss of video frames and Vo IP Phone Interrupt. Many in the lab is not the obvious question, in the actual network becomes very prominent. 3. Predictable and unpredictable things. Orderly and predictable thing in the application site is extremely rare. For example, network congestion will be delayed program stream, will be uninterrupted wireless connectivity, video streaming, VoIP voice stream and the transmission of large data streams would compete with the bandwidth, sometimes accompanied by these conditions. When these conditions is unavoidable, adequate capacity to reduce service levels will help make your design and competitors differ. 4. Allows custom interfaces. For wider application of set-top box to its design must allow service providers to customize the user interface. At this point, shape and feel of the adaptation of a production line is critical. 5. With field upgrade capability. For service providers, drove out the upgrade, the cost would be high. Remotely through the network can realize software upgrade, will save such costs. Should not be 1. Assume that the data rate constant. IP Network Traffic is the unexpected nature and easily blocked. Use of memory compensation network jitter buffer will be able to handle audio / video synchronization, and signal processing and control of the media stream to separate. 2. Assumed to receive all the data. Despite the missing data packet is a network of natural features, but after all the video frames and voice data stream loss will affect the user's experience. Systems can not be achieved in many media lost hide, which, whether for audio or the video is necessary. 3. Expect as Advertisement Claims broadband throughput. Different network segment and the data rate is different. When the compensation network on the changes, the content decoding throughput rate than the network claimed to be low. 4. Use media designed for a fixed decoder. IPTV set-top boxes need to be used must change the communication system designed decoder. 5. Partition processing too strict, making a number of new applications not in accordance with new ways to use its processing power. Flexible partitioning will not result in such a situation, that is, although the design is well implemented IPTV functionality, but slow Internet browsing and less effective. [Keywords]: IPTV STB Video on Demand Comment Large In Small The e-commerce company in China offers quality products such as Pvc Butterfly Valve Manufacturer , Pneumatic Butterfly Valve Manufacturer, and more. For more , please visit Wafer Type Butterfly Valve today!
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