MQAM multifunctional transmission system
A transmission system and multi-functional technology, applied in the field of digital TV broadcasting front-end systems and equipment, can solve the problems of high cost, high modulation error rate, low integration, etc.
Inactive Publication Date: 2009-09-09
北京维鲸视界科技有限公司
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Problems solved by technology
[0004] However, in the existing above-mentioned system, such as figure 1 As mentioned in , MQAM104 has an indirect radio frequency modulation module 111, which adopts the indirect radio frequency modulation technology that modulates the transport stream signal to the intermediate frequency signal first, and then converts the intermediate frequency signal to radio frequency through secondary upconversion, so there is carrier noise of radio frequency Disadvantages such as low ratio, large adjacent frequency interference, large modulation error rate, and high bit error rate
[0005] In addition, in practice, when users transmit video signals through MQAM, they sometimes wish to monitor the quality of programs transmitted in MQAM, sometimes wish to insert local advertisements, local news, etc. Scrambling is carried out in order to control the charging of cable TV users through joint control with the set-top box, but in the current above-mentioned system, the independent code stream monitor 105, transport stream scrambling device 106, and program inserter 107 are respectively used to realize these function, there are disadvantages of high cost, low integration, and inflexible configuration
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[0027] Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0028] figure 2 It is a schematic diagram of the digital TV broadcast front-end system of the present invention. figure 2 neutralize figure 1 The composition and function of the modules or components with the same designation are the same as those in figure 1 in the same. That is to say, content distribution network server 101, video on demand server 102, IP router 103, cable television network 108, set-top box 109 and TV set 110 are connected with figure 1 The descriptions in the descriptions are the same and will not be repeated here. In the following, only the differences are described.
[0029] From figure 2 It can be seen from the figure 2 and figure 1 The difference of the structure is: the MQAM multifunctional transmission system 200 has a direct digital radio frequency modulation module 204, and what the direct digital radio frequency modulation modu...
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The invention relates to a digital television broadcast front end system and aims to provide an MQAM multifunctional transmission system which converts a transmission stream from a computer network into a radio-frequency signal suitable for a cable TV network to use. The system comprises an IP gateway for receiving, filtering and resolving a TCP / IP data packet in the transmission stream, a router for performing PID mapping to the data output by the IP gateway to obtain a single program stream, a transmission flow multiplexer for multiplexing the single program stream to be a multiple program stream, a direct digital radio-frequency modulator for directly modulating the transmission stream obtained by multiplexing onto a radio frequency, and a microprocessor for controlling the IP gateway, the router, the transmission flow multiplexer and the digital radio-frequency modulator and storing the relevant parameters. The system also has functions of transmission stream scrambling, digital bit stream monitoring and spot announcement and can improve the quality of high radio-frequency signals and provide various interfaces and functions.
Description
technical field [0001] The present invention relates to a digital TV broadcasting front-end system and equipment, in particular to a system and equipment for converting transmission stream from a computer network into a radio frequency signal used by a cable TV network. Background technique [0002] The national "Eleventh Five-Year Plan" proposed the integration of telecommunications network, computer network and cable TV network. In order to speed up the pace of triple play, two-way transformation of cable TV network is an inevitable requirement for the survival and development of cable TV broadcasting. After a certain two-way transformation, the cable TV network can become a high-quality network resource that will carry the convergence of the three networks in the future. [0003] figure 1 It is the basic operating system of operators in the current broadcasting and television industry, in which the IP router 103 transmits the transmission stream in the computer network ...
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IPC IPC(8): H04N7/10H04N7/08
Inventor 赵照
Owner 北京维鲸视界科技有限公司