Method for simultaneously sending and receiving ABS-S and MMDS digital television
An ABS-S and digital TV technology, applied in electrical components, selective content distribution, image communication, etc., can solve problems such as unfavorable development of local characteristic culture and services, obstacles to digital TV advancement, and many front-end occupied frequency points, etc., to achieve Improve frequency utilization, convenient appreciation, and low investment cost
Active Publication Date: 2011-03-16
SICHUAN JINWANGTONG ELECTRONICS SCI & TECH
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Problems solved by technology
[0004] The existing digital TV system construction mode is usually digital TV front-end processing and transmission of local self-managed programs. As a result, the receiving terminal can only receive one kind of signal such as MMDS, terrestrial, cable, ABS-S, etc., which makes the existing digital TV system have many front-end occupied frequency points and low frequency point utilization rate. Low, not conducive to the development of local characteristic culture and services and other disadvantages, to a certain extent hindered the advancement of digital TV; especially the special and advanced nature of the ABS-S modulation method, one frequency point can transmit more sets of local programs, making the frequency point waste is more serious
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[0019] The present invention will be further elaborated below in conjunction with the accompanying drawings.
[0020] Such as figure 1 As shown, a method of simultaneously sending and receiving ABS-S and MMDS digital TV, the microwave signal with a frequency band of 300M to 950M enters multiple signals through the playback card and sends them to the multiplexer for multiplexing, and then passes through the supporting CAS and SMS systems Scramble with a scrambler. Then the program information of the scrambled MMDS microwave signal is compiled into a super NIT table according to the standard NIT table format, and the super NIT table and TS stream are modulated by the ABS-S modulator, and the modulated signal is converted by the MMDS down-converter. Compared with the standard NIT table, the super NIT table adds more detailed information about the parameters of each program, including audio and video information. The PID of the super NIT table is not the same as an existing or d...
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The invention discloses a method of simultaneously sending and receiving ABS-S and MMDS digital television, wherein, the MMDS microwave signal is modulated by the ABS-S modulator, the frequency of the MMDS microwave signal is converted by an MMDS down converter, and then the frequency of the ABS-S microwave signal is converted by the ABS-S down converter; the two kinds of signals are mixed in a mixer to one or more frequency points, and then transmitted to the ABS-S receiver through the MMDS microwave system transmission network, the ABS-S receiver demodulates the signals and transmits to the television for broadcasting; the ABS-S receiver can receive all frequency bands of ABS-S and MMDS. The present invention overcomes the deficiency that the prior art can only transmit or receive one of the ABS-S and MMDS and wastes frequency resource and terminal unit, enhances the utilization rate of ABS-S, improves the frequency point use ratio, has small alteration to the existing equipment, has low input cost, and facilitates users for appreciating ABS-S and MMDS television programs.
Description
technical field [0001] The invention discloses a digital TV sending and receiving method, especially a method for simultaneously sending and receiving ABS-S live broadcast satellite programs and MMDS TV programs. Background technique [0002] In order to promote the development of China's live broadcast satellite business, the State Administration of Radio, Film and Television organized the Broadcasting Science Research Institute and other units to make a special application for my country's satellite live broadcast application after comprehensively considering the management requirements, operation and maintenance requirements, business requirements and national industry development of satellite broadcasting. ABS-S (Advanced Broadcasting System-Satellite) is the technical system for radio and television signal transmission. The ABS-S standard is my country's first transmission standard with completely independent intellectual property rights. Its performance is comparable to...
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IPC IPC(8): H04N21/236H04N21/235
Inventor 刘海润陈文英
Owner SICHUAN JINWANGTONG ELECTRONICS SCI & TECH