CN105763874A - Signal quality monitoring device of cable digital television radio frequency signal and monitoring method thereof - Google Patents
Signal quality monitoring device of cable digital television radio frequency signal and monitoring method thereof Download PDFInfo
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Abstract
The invention provides a signal quality monitoring device of a cable digital television radio frequency signal. The device comprises a signal acquisition module, a data processing module, a communication module and a power supply. A single signal core processing chip unit is formed so as to carry out concurrent processing on more than N paths of signals and simultaneously acquire a signal index. The signal acquisition module receives an input digital television signal, carries out QAM demodulation processing to recover a binary system I/Q component signal and carries out frequency spectrum acquisition processing to acquire a frequency and signal intensity corresponding relation and then outputs to the data processing module. The data processing module transmits received data or a signal quality index acquired through processing, and the received data and/or processed monitoring data to an upper computer through the communication module connected to the data processing module. According to a set index threshold, an index fault is determined and event alarm triggering is performed. In the scheme of the invention, the single signal core processing chip unit can carry out concurrent processing on more than N paths (N>=2) of digital television frequency range signal monitoring, an integrated level is high and real-time performance is possessed.
Description
Technical field
The present invention relates to cable digital TV technical field, the signal quality in particular to a kind of RF Signal in Digital Cable TV System monitors device and monitoring method.
Background technology
Digital television signal monitoring generally adopts tuner and demodulator design on same debugging board, the differential signal of tuner output carries out DTV Analysis of Quality Control by the differential input end of line transmission to demodulator chip, on the other hand the differential signal that tuner exports is connected on audiofrequency spectrometer by sealing wire, is monitored analyzing to the frequency spectrum of the differential signal of tuner output.When being connected with audiofrequency spectrometer by tuner, one end of the differential signal outputs of tuner is connected to the ground section of audiofrequency spectrometer, and the other end is connected to the signal input part of audiofrequency spectrometer.This debud mode not only can disturb because of the introducing of sealing wire and cause test, there is systematic error, and when there is the sparking of audiofrequency spectrometer, it is also possible to by tuner wafer damage.
In prior art, the monitoring rate of signal quality of digital television is relatively passive, generally adopt manual type to observe audiofrequency spectrometer monitoring digital television signal, the user discover that when can not use, call staff to make house calls and solve problem, inefficiency, it is impossible to adapt to future services extension demand.But the labor intensity adopting manual observation audiofrequency spectrometer monitoring digital television signal is big, in many situations, frequency spectrum and picture signal can not reflected signal is interfered rapidly and accurately situations, be not provided that in time, warning message accurately, cause the situation that TV can not be play.
Meanwhile, independent at present spectrum analyzer is difficult to realize the function of all-channel DTV spectrum monitoring and Monitoring Indexes simultaneously.The digital television signal intensity index of certain frequency can be measured by spectrum analyzer, but the measurement of all-channel cannot be realized, need manually to switch over, and owing to there is no demodulating unit, it is impossible to for modulation error rate (MER), this kind of index measurement of the bit error rate (BER).
Summary of the invention
Present invention aim at providing the signal quality monitoring device of a kind of RF Signal in Digital Cable TV System and monitoring method, system dense degree is high, more than individual signals kernel processor chip unit just energy concurrent processing N road (N >=2) monitoring of DTV frequency band signals, obtain signal index simultaneously；It also is able to look-ahead digital television signal fault and audiofrequency spectrometer need not be used just to monitor full frequencies in digital TV road spectrum signal index in real time, being applicable to cable headend, the secondary front end real-time monitoring to digital television signal.
The above-mentioned purpose of the present invention is realized by the technical characteristic of independent claims, and dependent claims develops the technical characteristic of independent claims in the way of selecting else or be favourable.
For reaching above-mentioned purpose, the present invention proposes the signal quality monitoring device of a kind of RF Signal in Digital Cable TV System, it is characterized in that, including signal acquisition module, data processing module, communication module and power supply, the signal kernel processor chip unit that this signal acquisition module, data processing module, communication module and electric power generating composition are single, signal more than concurrent processing N road obtains signal index simultaneously, N >=2, wherein:
Described signal acquisition module is connected with data processing module, this signal acquisition module is arranged for the RF Signal in Digital Cable TV System receiving input, and carry out QAM demodulation process and obtain corresponding signal quality parameter index and/or digital catv signal is carried out Spectral acquisition obtain the frequency spectrum data of DTV designated frequency band, then export to data processing module；
Described data processing module data to receiving or process the quality indication signal obtaining digital catv signal, and by the communication module that is attached thereto by the data received and/or the Monitoring Data transmission after processing to host computer；
Described data processing module also/or be arranged for according to set criteria thresholds Judging index fault and carry out affair alarm triggering.
In further embodiment, described signal acquisition module includes low noise amplifier, the first acquisition channel and the second acquisition channel, and low noise amplifier is arranged for the digital television signal to input and carries out power amplification process, wherein:
Described first acquisition channel includes the tuner component, filter assembly and the qam demodulator assembly that are sequentially connected with: described tuner component is connected to the outfan of low noise amplifier, it chooses the N number of different digital TV channel in the spectrum signal of digital television signal based on the frequency of supervisory channel set, symbol rate and modulation format, and above-mentioned N number of different digital TV channel is down-converted to base band simultaneously；Described filter assembly is arranged for other all of channel spectrum filtered outside N number of digital TV channel that monitoring is required；Qam demodulator assembly has N number of qam demodulator, is respectively completed the demodulating process of the QAM modulation of described N number of different digital TV channel, N >=2 by N number of qam demodulator, recovers binary system I/Q component signal and be transferred to data processing module；
Described second acquisition channel includes the high-speed ADC module, channel equalization module and the up-downgoing Spectral acquisition module that are sequentially connected with: high-speed ADC module is connected to the outfan of low noise amplifier, the spectrum signal of the designated frequency range of the digital television signal of input is carried out high speed analog-to-digital conversion by it, and forms corresponding spectrum signal data；Channel equalization module is arranged for the digital signal after conversion is carried out the compensation optimizing of channel transfer characteristic；Described up-downgoing Spectral acquisition module is arranged for and carries out up-downgoing all-channel Spectral acquisition, obtains the corresponding relation of each frequency and signal intensity in full frequencies in digital TV road and is transferred to data processing module.
From the above technical solution of the present invention shows that, compared with prior art, the having the great advantage that of the present invention
1, real time digital television all-channel spectrum monitoring, the monitoring device of the signal quality of digital television index of the present invention, it it is the monitoring device towards QAM signal monitoring of a kind of high density, low cost, the real-time crawl of DTV QAM up-downgoing all-channel frequency spectrum can be accomplished, the real-time monitoring of QAM signal index, reaches high-quality, efficient DTV QAM signal monitoring；
Conventional digital TV spectrum monitoring means can only adopt DTV audiofrequency spectrometer, and this product price is also expensive, is also inconvenient to carry, and on cost and in utilization scene, is also not suitable for large-scale use on each transmission core node of DTV.The present invention can conveniently use at each node of digital television transfer link, and monitoring mode not only product price based on high speed all-channel Spectral acquisition technology is relatively low, more convenient large-scale use realizes omnibearing DTV link detecting, each joint in digital television transfer, DTV up-downgoing all-channel frequency spectrum can be obtained in real time, real-time frequency signal intensity, channel SNRs etc. can be obtained by frequency spectrum data, reliable guarantee can be provided for the safe transmission of digital television signal；
2, the monitoring device of the present invention adopts single port multifrequency point monitoring mode, can disposable all be obtained by signal index under channels multiple in the coaxial cable of transmitting digital TV signal, and efficiency is high, and is lasting real-time monitoring；
System dense degree is high, and more than individual signals kernel processor chip unit just energy concurrent processing N road, N >=2, DTV frequency band signals is monitored, and obtains signal index simultaneously；Conventional digital TV signal monitoring mode adopts QAM demodulation mode, is each demodulated understanding the signal quality of each QAM frequency by the mode of single port single-frequency point QAM demodulation by frequencies all in DTV.Digital television signal monitoring device not only cost based on this technology is expensive, signal monitoring poor real, the huge monitoring that can not cover each transmission point of DTV of equipment.Therefore the present invention adopts the digital television signal of highdensity single port multifrequency point to be monitored, the density of monitoring device can be greatly improved, the digital television monitoring device of each node of digital television transfer be no longer necessary to large volume, big power consumption, high cost monitoring device, instead the monitoring device of low cost, high density, can provide reliable guarantee for the safe transmission of digital television signal.
As long as should be appreciated that all combinations of aforementioned concepts and the extra design described in greater detail below can be viewed as a part for the subject matter of the disclosure when such design is not conflicting.It addition, all combinations of theme required for protection are considered as a part for the subject matter of the disclosure.
Foregoing and other aspect, embodiment and the feature that present invention teach that can be more fully appreciated with from the following description in conjunction with accompanying drawing.Feature and/or the beneficial effect of other additional aspect such as illustrative embodiments of the present invention will be obvious in the following description, or by the practice according to the detailed description of the invention that present invention teach that is learnt.
Accompanying drawing explanation
Accompanying drawing is not intended to drawn to scale.In the accompanying drawings, each identical or approximately uniform ingredient illustrated in each figure can be indicated by the same numeral.For clarity, in each figure, it is not that each ingredient is all labeled.Now, by by example the embodiment that various aspects of the invention are described in reference to the drawings, wherein:
Fig. 1 is the structural representation of the signal quality monitoring device of the digital television signal according to certain embodiments of the invention.
Fig. 2 is the principle schematic of the signal acquisition module of the signal quality monitoring device of the digital television signal according to certain embodiments of the invention.
Fig. 3 is the schematic flow sheet of the signal quality monitoring method of the digital television signal according to certain embodiments of the invention.
The signal quality monitoring device that Fig. 4 is the digital television signal according to certain embodiments of the invention is applied to the theory diagram of digital TV front-end.
The signal quality monitoring device that Fig. 5 is the digital television signal according to certain embodiments of the invention is applied to the theory diagram of DTV sub-headend.
Detailed description of the invention
In order to know more about the technology contents of the present invention, especially exemplified by specific embodiment and to coordinate institute accompanying drawings to illustrate as follows.
Each side with reference to the accompanying drawings to describe the present invention in the disclosure, shown in the drawings of the embodiment of many explanations.Embodiment of the disclosure all aspects that must not be intended to include the present invention.It is to be understood that, multiple design presented hereinbefore and embodiment, and describe in more detail below those design and embodiment can in many ways in any one is implemented, this is because design disclosed in this invention and embodiment are not limited to any embodiment.It addition, aspects more disclosed by the invention can be used alone, or otherwise any appropriately combined use with disclosed by the invention.
Shown in Fig. 1, Fig. 2, according to embodiments of the invention, the signal quality monitoring device of a kind of RF Signal in Digital Cable TV System, including signal acquisition module, data processing module, communication module, power supply.
Whole signal quality monitoring device is connected with host computer.
The signal kernel processor chip unit that signal acquisition module, data processing module, communication module and electric power generating composition are single, signal more than concurrent processing N road obtains signal index simultaneously, concurrent processing N road numbers above TV band signal monitoring, N >=2 can be realized, obtain signal index simultaneously；It also is able to look-ahead digital television signal fault and audiofrequency spectrometer need not be used just to monitor full frequencies in digital TV road spectrum signal index in real time.
Such as Fig. 1, signal acquisition module is connected with data processing module, this signal acquisition module is arranged for the RF Signal in Digital Cable TV System receiving input, and carry out QAM demodulation process recover binary system I/Q component signal and digital catv signal is carried out Spectral acquisition process obtain all-channel spectrum signal, then export to data processing module.
It it is the radiofrequency signal through QAM modulation to digital catv signal.This digital television signal enters the monitoring device of the embodiment of the present invention through " digital television signal " of F type interface.
Data processing module data to receiving or process the quality indication signal obtaining digital television signal, by the communication module that is attached thereto by the data received and/or the Monitoring Data transmission after processing to host computer；This data processing module also/or be arranged for according to set criteria thresholds Judging index fault and carry out affair alarm triggering.
Host computer is for receiving the data that data processing module sends, the visualization carrying out data presents and carrys out the running parameter of setting signal quality monitoring device by controlling described data processing module, the running parameter of such as signal acquisition module and data processing module sets, the especially running parameter setting etc. of the tuner component in Fig. 2, filter assembly, up-downgoing Spectral acquisition module.
In this example, host computer is by arranging the threshold value (criteria thresholds namely set) of the signal quality of digital television index of monitoring, when lower than this threshold value, certain DTV index objective can think that this index breaks down, now data processing module can real-time alert, this information comprises data type that this fault occurs, triggers this value data when changing time point and the fault of time；When this DTV index is restored on fault threshold, objective can think that this index recovers normal, data processing module can send the information of fault recovery in real time, this value data when this information comprises the data type of fault recovery generation, index recovers normal time point and recovers.By such warning message, it is simple to monitoring in real time finds and facilitates operation personnel to find and fault location.
Described threshold value is arranged by host computer, host computer adjustable settings alarm threshold.
Host computer according to circumstances can also carry out the running parameter of setting signal acquisition module by controlling data processing module, changes the monitoring frequency of qam signal, modulation system, symbol rate, makes monitoring have more specific aim.
Shown in Fig. 2, signal acquisition module includes low noise amplifier, the first acquisition channel and the second acquisition channel, low noise amplifier is arranged for the digital television signal to input and carries out power amplification process, to meet the subsequent module working condition to signal power.
In conjunction with Fig. 2, Fig. 3, first acquisition channel includes the tuner component, filter assembly and the qam demodulator assembly that are sequentially connected with: described tuner component is connected to the outfan of low noise amplifier, it chooses the N number of different digital TV channel in the spectrum signal of digital television signal based on the frequency of supervisory channel set, symbol rate and modulation format, and above-mentioned N number of different digital TV channel is down-converted to base band simultaneously；Described filter assembly is arranged for other all of channel spectrum filtered outside N number of digital TV channel that monitoring is required；Qam demodulator assembly has N number of qam demodulator, is respectively completed the demodulating process of the QAM modulation of described N number of different digital TV channel by N number of qam demodulator, recovers binary system I/Q component signal, and be transferred to data processing module, and wherein N is be more than or equal to 2.In an embodiment of the present invention, we illustrate for 8 passage concurrent processing
Digital catv signal enters the monitoring device of the present invention through " digital television signal " of F type interface.Through " low noise amplifier " amplifier digital TV signal to meet the subsequent module working condition to signal power." tuner component " is by PC control, set the required frequency of channel of monitoring, symbol rate and modulation format, tuner component especially low-power consumption tuner component selects the N number of different digital TV channel in above-mentioned digital television signal, and 8 different digital TV channels are down-converted to base band simultaneously, other all channel spectrum outside 8 digital TV channels that monitoring is required are filtered, to prevent various signal cross-talk again through " channel model assembly ".Being respectively completed the demodulating process of QAM modulation finally by 8 " qam demodulators " of qam demodulator assembly, remove coding checkout, original I/Q signal, such original I/Q signal is transferred to data processing module.In conjunction with Fig. 3, this monitoring process we be called DTV QAM Monitoring Indexes.
In this example, after processing radiofrequency signal (i.e. digital television signal) by tuner component, filter assembly and qam demodulator assembly, the output data of 8 qam demodulators have 8 groups, exemplarily, the data of qam demodulator assembly output include: frequency 115MHz, signal intensity 66.5dbuv, MER-38.7dB, BER are 0, and number of constellation points is according to [-1,-3] [1,3] [1,1] [-3,1] etc., such data one have 8 groups, because having 8 channels in an embodiment of the present invention.
In whole process, the numerical value of DTV QAM index, including:
1. the signal intensity of digital television signal, the bit error rate, channel SNRs, tuner locked condition, code stream sync status after the bit error rate, forward error correction before forward error correction, directly can export result from qam demodulator volume and read；
The real-time planisphere of 2.QAM frequency, is recovered binary system I/Q component signal by QAM demodulation and completes；
3. the modulation bit error rate, the ratio of the number of times of error code and the sum of bit stream, i other words it is the probability characterizing digital television signal error code, the modulation bit error rate has been calculated by recovering binary system I/Q component signal by data processing module, and the calculating of the bit error rate can adopt existing computational algorithm to realize.
Shown in Fig. 1, Fig. 2, Fig. 3, second acquisition channel includes the high-speed ADC module, channel equalization module and the up-downgoing Spectral acquisition module that are sequentially connected with: high-speed ADC module is connected to the outfan of low noise amplifier, the spectrum signal of the designated frequency range of the RF Signal in Digital Cable TV System of input is carried out high speed analog-to-digital conversion by it, and forms corresponding spectrum signal data；Channel equalization module is arranged for the digital signal after conversion is carried out the compensation optimizing of channel transfer characteristic；Described up-downgoing Spectral acquisition module is arranged for and carries out full frequencies in digital TV road Spectral acquisition, completes last FFT computing, obtains the corresponding relation of each frequency and signal intensity in full frequencies in digital TV road frequency spectrum and is transferred to data processing module.In conjunction with Fig. 3, this monitoring process we be called full frequencies in digital TV road spectrum monitoring.
Exemplarily, the concrete data of up-downgoing Spectral acquisition module output can be understood as and include: frequency 115MHz, signal intensity 66.5dbuv；Frequency 123MHz, signal intensity 66.1dbuv；…；Until full frequencies in digital TV spectrum band limits.
In conjunction with Fig. 2, Fig. 3, the analog digital conversion to digital television signal is completed by high-speed ADC module, be converted to digital signal, the data obtained complete the compensation optimizing to channel transfer characteristic by channel equalization module, compensated digital signal defect in transmitting procedure, such as reflecting background and influx noise.Signal after compensation completes the original process to the data collected then through up-downgoing Spectral acquisition module, with forms such as " frequency=XXX-MHz; signal intensity=XXXdBuv " " frequency=YYY-MHz; signal intensity=ZZZdBuv ", the corresponding relation of each frequency in DTV frequency range entire spectrum and signal intensity being presented to data processing module, the latter just can directly draw out DTV up-downgoing all-channel frequency spectrum.This is a real-time all-channel spectrum monitoring process.
Shown in Fig. 1, Fig. 2, the alarm threshold of the quality indication signal data that data processing module obtains and setting compares, if exceed the bound of alarm threshold, sends warning message to host computer by communication module.The achievement data obtained when data processing module, within the scope of the alarm threshold set, sends signal by communication module to host computer and normally notifies.
In embodiments of the invention, the quality index of digital signal quality monitoring specifically includes that
Signal intensity: the index that signal is strong and weak, in certain embodiments, in setting data processing module, the threshold range of signal intensity is 65-75dBuV.
Modulation Error Rate: referring to single " quality factor " of received signals, in certain embodiments, in setting data processing module, the threshold value of signal intensity is 30dB.
Signal to noise ratio: referring to the ratio of signal and noise in an electronic equipment or electronic system, in certain embodiments, in setting data processing module, the value of signal intensity is 30dB.
The bit error rate: being the index weighing data data at the appointed time transmission accuracy, in certain embodiments, in setting data processing module, the value of the bit error rate is 10E-9.
Shown in Fig. 2, Fig. 3, host computer realizes warning message and shows that the step presented includes:
By data processing module, the data that the first acquisition channel and the second acquisition channel export are carried out process and obtain digital signal quality index, including the signal intensity obtained by the first acquisition channel, Modulation Error Rate, signal to noise ratio, Modulation Error Rate and the bit error rate；Second treatment channel data process spectrum signal intensity, the signal to noise ratio etc. that obtain.
The data processing module signal intensity to collecting carries out the bound of threshold value and judges, if the signal intensity gathered is not when setting the scope of thresholding A-BdBuV, data processing module is to host computer strength of transmitted signals datagram alarming information；If the signal intensity gathered returned in normal range, then send data and recover normal instructions.
Modulation Error Rate is carried out the bound of threshold value and judges by data processing module, and when the Modulation Error Rate of collection is lower than setting value, data processing module sends Modulation Error Rate datagram alarming information to host computer；If the modulation error gathered returns to be more than or equal to setting value, then send data and recover normal instructions.
Signal to noise ratio is carried out the bound of threshold value and judges by data processing module, gathers the signal to noise ratio of signal lower than when setting threshold value, and data processing module sends signal-to-noise ratio data warning message to host computer；If the signal to noise ratio gathered returns to be more than or equal to when setting threshold value, then sending data and recover normal instructions.
The bit error rate is carried out threshold value bound judgement by data processing module, and when the bit error rate of collection is higher than predetermined value, data processing module sends error rate data warning message to host computer；If the bit error rate gathered returns to less than or equal to during with predetermined value, then sending data and recover normal instructions.
Host computer receives and video data processing module exports datagram alarming information and data normal instructions, it is possible to visual mode presents to user, intuitively arrives the quality index situation of digital television signal.During real time monitoring, when quality problems occurs in digital television signal, reminding relevant staff to note the reason of the appearance quality being correlated with in time, the reason that fault is occurred is adjusted.
As seen from the above embodiment, utilize the quality indication signal monitoring system of the present invention, first it is the full frequencies in digital TV road frequency spectrum in this root copper cash of the coaxial cable of transmitting digital TV signal can be presented in real time, and the speed presented is very fast, 1 second namely refreshable more than ten times are even more, next to that high integration, single port can complete multi channel DTV index and monitor in real time, and prior art to complete this index and monitors in real time and can only realize with audiofrequency spectrometer, this monitoring mode time-intensive, expensive, the requirement of the full monitoring of television transmission can not be met, and the monitoring device of the present invention is disposable all to be obtained by signal index under channels multiple in the coaxial cable of transmitting digital TV signal, such as signal intensity, signal to noise ratio, the bit error rate, lock-out state etc.；And existing product is all 1 the channel poll collection of one master chip of 1 equipment, in the present invention program individual signals kernel processor chip unit just can more than concurrent processing N road (N >=2) DTV frequency band signals monitoring, high integration and be all Real-time Collection.
In embodiments of the invention, communication module can be the RJ45 interface containing Ethernet, and host computer can pass through Ethernet and connect the relevant Monitoring Data of reading to communication module, obtains warning message etc.；Communication module can also be CableModerm Cable Modem, relevant information is transferred to the CMTS signal in coaxial cable, host computer can pass through the CMTS signal relevant Monitoring Data of connection reading after coaxial cable, acquisition warning message, it is not necessary to lays netting twine again.
As preferred scheme, communication module can for utilize the network topology structure that Ethernet netting twine is formed or the network topology structure utilizing cablemoderm to be formed, and available multiple connected mode realizes data communication.
As preferably, described data processing module is provided with temperature and/or humidity compensating module, for adapting to the monitoring of digital television signal under different operating environment, improves precision and the accuracy of monitoring.
The alarm threshold (i.e. threshold value or threshold range) of each quality indication signal described is arranged by host computer, and host computer is by adjusting setting alarm threshold, and can according to circumstances change the frequency or modulation system of monitoring QAM signal, makes monitoring have more specific aim.
Shown in Fig. 4 and Fig. 5, respectively the signal quality of the present invention monitors the device application at digital TV front-end or DTV sub-headend, the digital television signal monitoring device of the present invention can be respectively arranged at digital TV front-end or DTV sub-headend, monitors the quality index of digital television signal under different duties.
As shown in Figure 4, when digital television signal monitoring device is arranged on digital TV front-end, can to the active and standby road radio frequency output signal monitoring before radio-frequency (RF) switch in monitoring point 1,2, it is possible to the problem finding active and standby modulating system；Radio frequency can be switched switch output signal in monitoring point 3 and carry out passive mixing, mixed signal is monitored, it is possible to the problem finding switching switch and signal mixing point；Active and standby light can be signaled in monitoring point 4,5 and be monitored, it has been found that the problem that light sends out equipment.
In conjunction with Fig. 1, Fig. 4, the digital television signal monitoring device of the embodiment of the present invention can to the active and standby road radiofrequency signal after front end multiplexing, coding, scrambling and QAM rf modulations, radiofrequency signal after switching, is monitored by the radiofrequency signal before and after the mixed radiofrequency signal of blender and light method.By observing numeral each frequency channel flatness of television spectrum, each frequency signal to noise ratio etc., index is monitored；By the bit error rate, channel SNRs, the modulation bit error rate, tuner locked condition, code stream sync status etc. after the bit error rate, forward error correction before observing numeral each frequency signal intensity of television spectrum, forward error correction, index is monitored.Each monitoring point of digital TV front-end is as all adopted originally based on the digital television monitoring equipment of high speed Spectral acquisition and monitoring method, facilitating and discover whether that equipment operation irregularity causes the problems such as DTV index cracking in real time, no in digital television signal exist spectral interference, clutter, mixing etc. and have a strong impact on the fault of digital television signal.
As it is shown in figure 5, when digital television signal monitoring device is arranged on DTV sub-headend, the signal output that active and standby light is received can be monitored in monitoring point 1,2；The packet output of each hybrid digital TV, interactive VOD and broadband CMTS signal can be monitored in monitoring point 3；Packet ray machine output signal can be monitored in monitoring point 4.
In conjunction with Fig. 1, Fig. 5, the digital television signal monitoring device of the embodiment of the present invention receives through light for optical signal that digital TV front-end is transmitted, be assigned to interactive VOD mixing before spectrum signal carry out multiple spot monitoring step by step, the whole network QAM signal that extension set room mixed interactive VOD, CMTS signal is monitored, and monitoring point is generally the QAM signal after light is sent out.By observing numeral each frequency channel flatness of television spectrum, each frequency signal to noise ratio etc., index is monitored；By the bit error rate, channel SNRs, the modulation bit error rate, tuner locked condition, code stream sync status etc. after the bit error rate, forward error correction before observing numeral each frequency signal intensity of television spectrum, forward error correction, index is monitored.Each monitoring point of DTV sub-headend is as all adopted this based on the digital television monitoring method of high speed Spectral acquisition, can conveniently realize having discovered whether that equipment operation irregularity causes the problems such as DTV index cracking in real time, whether there is spectral interference, clutter, mixing etc. and have a strong impact on the fault of digital television signal, it is ensured that cable television is high-quality is transferred to each user.
In conjunction with Fig. 4, Fig. 5, the digital television signal monitoring device of the embodiment of the present invention is for digital TV front-end, when the upward signal of sub-headend is monitored, digital television signal monitoring device utilizes this monitoring device to complete the uplink spectrum to CMTS or various EOC equipment at DTV sub-headend and monitors, by at a high speed, the up all-channel frequency spectrum data of real-time crawl, by the crawl of uplink spectrum data being obtained the return noise of burst type, out of band signal interference noise, link inactive component reflecting background etc., this detection is meaningful to the existing upward signal malfunction elimination of digital television transmission system, upward signal interference can be positioned quickly and accurately, the trouble point of fault, more can give warning in advance, prevent trouble before it happens.
Although the present invention is disclosed above with preferred embodiment, so it is not limited to the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on those as defined in claim.
Claims (6)
1. the signal quality monitoring device of a RF Signal in Digital Cable TV System, it is characterized in that, including signal acquisition module, data processing module, communication module and power supply, the core signal process chip unit that this signal acquisition module, data processing module, communication module and electric power generating composition are single, signal more than concurrent processing N road obtains signal index simultaneously, N >=2, wherein:
Described signal acquisition module is connected with data processing module, this signal acquisition module is arranged for the RF Signal in Digital Cable TV System receiving input, and carry out QAM demodulation process and obtain corresponding signal quality parameter index and/or digital catv signal is carried out Spectral acquisition obtain the frequency spectrum data of DTV designated frequency band, then export to data processing module；
Described data processing module data to receiving or process the quality indication signal obtaining digital catv signal, by the communication module that is attached thereto by the data received and/or the Monitoring Data transmission after processing to host computer；
Described data processing module is also arranged for according to the criteria thresholds Judging index fault set and carries out affair alarm triggering.
2. the signal quality monitoring device of RF Signal in Digital Cable TV System according to claim 1, it is characterized in that, described signal acquisition module includes low noise amplifier, the first acquisition channel and the second acquisition channel, low noise amplifier is arranged for the RF Signal in Digital Cable TV System to input and carries out power amplification process, wherein:
Described first acquisition channel includes the tuner component, filter assembly and the qam demodulator assembly that are sequentially connected with: described tuner component is connected to the outfan of low noise amplifier, it chooses the N number of different digital TV channel in RF Signal in Digital Cable TV System based on the frequency of supervisory channel set, symbol rate and modulation format, and above-mentioned N number of different digital TV channel is down-converted to base band simultaneously；Described filter assembly is arranged for other all of channel spectrum filtered outside N number of digital TV channel that monitoring is required；Qam demodulator assembly has N number of qam demodulator, is respectively completed the QAM demodulating process of described N number of different digital TV channel, N >=2 by N number of qam demodulator, recovers binary system I/Q component signal and processes, and is transferred to data processing module；
Described second acquisition channel includes the high-speed ADC module, channel equalization module and the up-downgoing Spectral acquisition module that are sequentially connected with: high-speed ADC module is connected to the outfan of low noise amplifier, the spectrum signal of the designated frequency range of the RF Signal in Digital Cable TV System of input is carried out high speed analog-to-digital conversion by it, and forms corresponding spectrum signal data；Channel equalization module is arranged for the digital signal after conversion is carried out the compensation optimizing of channel transfer characteristic；Described up-downgoing Spectral acquisition module is arranged for and carries out DTV Spectral acquisition, obtains the corresponding relation of each frequency and signal intensity in digital television radio-frequency signal and is transferred to data processing module.
3. the signal quality monitoring device of RF Signal in Digital Cable TV System according to claim 1 and 2, it is characterised in that the running parameter scalable of described signal acquisition module, described running parameter includes the frequency of qam signal, modulation system, symbol rate.
4. the signal quality monitoring device of RF Signal in Digital Cable TV System according to claim 2, it is characterized in that, described data processing module exceedes the bound alert of alarm threshold in response to any one in the signal intensity of Real-time Collection, Modulation Error Rate, signal to noise ratio and the bit error rate, and returns in response to signal intensity, Modulation Error Rate, signal to noise ratio and the bit error rate and send signal normal information within the scope of alarm threshold bound.
5. the signal quality monitoring device of RF Signal in Digital Cable TV System according to claim 4, it is characterized in that, the data that first acquisition channel and the second acquisition channel export are carried out process and obtain digital signal quality index and carry out affair alarm triggering by described data processing module, including being processed the signal intensity, Modulation Error Rate, signal to noise ratio, Modulation Error Rate and the bit error rate that obtain by the first acquisition channel data, the second treatment channel data process the DTV spectrum signal intensity obtained:
The data processing module signal intensity to collecting carries out the bound of threshold value and judges, if the signal intensity gathered is not when the scope of thresholding set, data processing module is to host computer strength of transmitted signals datagram alarming information；If the signal intensity gathered returned in normal range, then send data and recover normal instructions；
Modulation Error Rate is carried out the bound of threshold value and judges by data processing module, and the Modulation Error Rate of collection is lower than when arranging value, and data processing module sends Modulation Error Rate datagram alarming information to host computer；If the modulation error gathered returns to be more than or equal to setting value, then send data and recover normal instructions；
Signal to noise ratio is carried out the bound of threshold value and judges by data processing module, gathers the signal to noise ratio of signal lower than when setting threshold value, and data processing module sends signal-to-noise ratio data warning message to host computer；If the signal to noise ratio gathered returns to be more than or equal to when setting threshold value, then sending data and recover normal instructions；
The bit error rate is carried out threshold value bound judgement by data processing module, and when the bit error rate of collection is higher than preset value, data processing module sends error rate data warning message to host computer；If the bit error rate gathered returns to less than or equal to preset value, then send data and recover normal instructions.
6. the signal quality monitoring device of RF Signal in Digital Cable TV System according to claim 1, it is characterised in that described data processing module is provided with temperature and/or humidity compensating module.
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