Full frequency algorithm in digital television channel processing system
A channel processing and digital TV technology, applied in the field of information processing, can solve problems such as excessive frequency design, consumption of hardware resources, errors, etc., to achieve the effect of ensuring system accuracy requirements, saving hardware resources, and solving system errors
Active Publication Date: 2010-12-29
BEIJING BBEF SCI & TECH
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Problems solved by technology
[0016] First, each frequency is the result of rounding (retaining three decimal places), and inaccuracy will cause cumulative errors in the system
[0017] Second, the existing digital phase-locked loop technology is less than the exact accuracy given by the system. Too many and too detailed frequency designs will cause greater system errors
[0018] Third, there are more than 300 transmission modes stipulated by the national standard. The above is only the frequency result of one mode, so the frequency of all modes calculated according to the current frequency algorithm will be very large and complex, which greatly consumes precious hardware resources.
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[0044] For further setting forth the technical means and effect that the present invention takes for reaching the predetermined invention purpose, below in conjunction with accompanying drawing and preferred embodiment, to its specific implementation manner, Structure, processing method step, feature and effect thereof are as follows in detail.
[0045] see figure 2 Shown, the full-frequency algorithm in the digital television channel processing system of preferred embodiment of the present invention, it is mainly all processing modules in the digital television channel processing system, uniformly processes by the frequency of the processing module of highest rate wherein, uses Inserting empty packets makes all processing modules process the same amount of information at the same time. Therefore, many disadvantages caused by different processing modules using different frequencies in the prior art are overcome.
[0046] see image 3 Shown, the full-frequency algorithm in ...
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The invention relates to an information processing method, in particular to a full frequency algorithm in a digital television (DTV) channel processing system, wherein, according to the frequency of the processing module with the maximum speed, all processing modules in the DTV channel processing system are subjected to information processing uniformly with the same information processing quantity in the same time by inserting empty data packets, thus overcoming the defect caused by phase-locked loops with one frequency set in each processing module, and greatly saving precious hardware resources in an FPGA; and 30.24M crystal oscillation is taken as a drive frequency source, thus guaranteeing the precision demand of the system.
Description
technical field [0001] The invention relates to an information processing method, in particular to a full-frequency algorithm in a digital television channel processing system. Background technique [0002] The "Digital TV Terrestrial Broadcasting Transmission System Frame Structure, Channel Coding and Modulation" (GB20600-2006) standard promulgated by my country in 2006 provides detailed processing and modularization regulations and instructions for the channel processing part of digital terrestrial TV. The specific processing modules include scrambling , BCH coding, LDPC coding, QAM mapping, interleaving, framing and other key processing modules. Due to the wide processing bandwidth and fast required speed, everyone chooses large-scale integrated circuit FPGA as the hardware platform, and a processing module of the FPGA system The key difficulty lies in how to design a set of frequency algorithms that are accurate and easy to implement. [0003] Since the input information ...
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Inventor 张守忠吕锋田晓璞肖辉邓素兰
Owner BEIJING BBEF SCI & TECH