Ground digital television signal demodulating, decoding and analyzing method for quasi-real-time signal analyzer
A technology of terrestrial digital TV and signal analyzer, which is applied in the field of signal demodulation and decoding analysis system, can solve problems such as inflexibility, many chip constraints, and inability to realize demodulation and decoding, and achieve high flexibility and low implementation complexity Effect
Active Publication Date: 2012-11-28
TIANJIN DEVISER ELECTRIC INSTR
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Problems solved by technology
[0005] Its disadvantage is that it is more restricted by the chip itself and is very inflexible
[0008] Its shortcoming is that real-time demodulation and decoding cannot be realized
[0011] Its shortcomings are: the implementation complexity is high, and after the plan is determined, the modification will be more complicated
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Embodiment 1
[0038] Such as figure 1 As shown, the signal demodulation and decoding analysis method in the terrestrial digital television field of the quasi-real-time signal analyzer provided by the present invention comprises the following steps:
[0039] 1. Preprocessing of intermediate frequency A / D conversion data: the FPGA directly receives the intermediate frequency A / D conversion data output by the analog-to-digital converter in the tuner, and preprocesses these data. Then pass the preprocessed data to DSP for further processing;
[0040]Described preprocessing comprises: the acquisition of data, frequency down-conversion and low-pass filtering, the data output through FPGA preprocessing is sampling rate 20MHz~50MHz (can be adjusted according to different hardware, typical value when intermediate frequency is 36MHz, sampling rate is 28MHz,), the baseband signal data with a bandwidth of 8M, these data are stored in the DSP's external memory synchronous dynamic random access memory S...
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The invention discloses a ground digital television signal demodulating, decoding and analyzing method for a quasi-real-time signal analyzer, which comprises that: a field programmable gate array directly receives intermediate-frequency A / D converted data output by an analogue-to-digital converter in a tuner, and performs the preprocessing of data acquisition, down-conversion, low-pass filtrationand the like; a decoding chip simultaneously processes multi-carrier signals and outputs a transmission stream (TS) and the number of error codes in the demodulation in real time; and a digital signal processor finishes the relatively more complex operation of timely and timed carrier recovery, channel estimation balancing, planisphere data analysis and the like, simultaneously accesses an internal register of the decoding chip through an I2C bus, reads the number of the error codes output by the chip, records the moments and error numbers of the error codes so as to obtain a bit error rate (BER) / packet error rate (PER) index of intermediate frequency signals, and outputs an error code cartogram. The method has the advantages of fully developing own advantages of the DSP, the FPGA and an application specific integrated circuit (ASIC) chip in signal analysis, and endowing a system with the characteristics of low implementation complexity, high flexibility and real-time decoding.
Description
【Technical field】 [0001] The invention relates to a signal demodulation, decoding and analysis system in the field of terrestrial digital television, which adopts the scheme of DSP (digital signal processor) + FPGA (programmable logic gate array of components) + ASIC (application specific integrated circuit) chip to carry out demodulation, decoding and analysis. DSP+FPGA demodulates and analyzes DTMB (Digital TV Terrestrial Multimedia Broadcasting) signals, and outputs constellation diagrams, MER (modulation error rate), EVM (vector error), system information and other demodulation intermediate information for signal diagnosis and measurement. At the same time, ASIC chip is used for decoding, real-time output of TV program stream, and output of PER (Packet Error Rate), BER (Bit Error Rate) and other information for long-term monitoring of signals, which can capture sudden interference of signals. 【Background technique】 [0002] The signal analysis of digital TV includes two ...
Claims
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IPC IPC(8): H04N17/00H04L27/26
Inventor 张艳辉张敬坡
Owner TIANJIN DEVISER ELECTRIC INSTR