CN205610840U - Signal quality monitoring device that has line number word TV radiofrequency signal - Google Patents
Signal quality monitoring device that has line number word TV radiofrequency signal Download PDFInfo
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Abstract
The utility model provides a digital television signal's signal quality monitoring device, including signal acquisition module, data processing module, communication module and power, constitute individualistic signal core and handle chip unit to it obtains the signal index simultaneously to send out the signal of handling more than the N way. The digital television signal of input is received to the signal acquisition module, carries out QAM demodulation processing and resumes a binary system IQ component signal and handle with the frequency spectrum collection and obtain frequency and signal intensity corresponding relation, exports data processing module to, data processing module is to the received data or handle the signal quality index who obtains, through the communication module that connects with it with the received data and/or monitoring data transmission to the host computer after handling, can judge to go forward side by side the index trouble it reports to the police to act according to the index threshold of setting for and trigger. The utility model discloses a just (N>more than the ability concurrent processing N way of chip unit is handled to single signal core in the scheme, = 2) digital television frequency channel signal monitoring, high integration and have the real -time.
Description
Technical field
This utility model relates to wired digital television techniques field, in particular to a kind of cable digital TV
The signal quality monitoring device of radiofrequency signal.
Background technology
Digital television signal monitoring generally uses by tuner and demodulator design on same debugging board, high frequency
The differential signal of head output carries out DTV quality by the differential input end of line transmission to demodulator chip
Monitoring analysis, is on the other hand connected to the differential signal that tuner exports on audiofrequency spectrometer by sealing wire, right
The frequency spectrum of the differential signal of tuner output is monitored analyzing.When tuner is connected with audiofrequency spectrometer, high
Frequently one end of the differential signal outputs of head is connected to the ground section of audiofrequency spectrometer, and the other end is connected to audiofrequency spectrometer
Signal input part.This debud mode not only can disturb because of the introducing of sealing wire and cause test, exists and is
System error, and when there is the sparking of audiofrequency spectrometer, it is also possible to by tuner wafer damage.
In prior art, relatively passive to the monitoring rate of signal quality of digital television, generally use manual type to observe
Audiofrequency spectrometer monitoring digital television signal, the user discover that when can not use, calls staff and make house calls
Solve problem, inefficiency, it is impossible to adapt to future services extension demand.But use manual observation audiofrequency spectrometer
The labor intensity of monitoring digital television signal is big, and in the case of many, frequency spectrum and picture signal can not be rapidly and accurately
Reflection signal situation about being interfered, it is impossible to provide in time, warning message accurately, causes TV not broadcast
The situation put.
Meanwhile, the most individually spectrum analyzer is difficult to realize all-channel DTV spectrum monitoring simultaneously and refer to
The function of mark monitoring.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, nothing
Method is that modulation error rate (MER), the bit error rate (BER) this kind of index measure.
Utility model content
This utility model purpose is to provide the signal quality monitoring device of a kind of RF Signal in Digital Cable TV System
And monitoring scheme, system dense degree is high, and individual signals kernel processor chip unit just can concurrent processing N road
Above (N >=2) monitoring of DTV frequency band signals, obtain signal index simultaneously；It also is able to look-ahead numeral
TV signal fault and need not use audiofrequency spectrometer just can monitor full frequencies in digital TV road spectrum signal in real time and refer to
Mark, is applicable to cable headend, the secondary front end real-time monitoring to digital television signal.
Above-mentioned purpose of the present utility model is realized by the technical characteristic of independent claims, dependent claims
The technical characteristic of independent claims is developed in the way of selecting else or be favourable.
For reaching above-mentioned purpose, the utility model proposes the signal quality of a kind of RF Signal in Digital Cable TV System
Monitoring device, it is characterised in that include signal acquisition module, data processing module, communication module and electricity
Source, the signal core that this signal acquisition module, data processing module, communication module and electric power generating composition are single
Processing chip unit, signal more than concurrent processing N road obtains signal index simultaneously, N >=2, wherein:
Described signal acquisition module is connected with data processing module, and this signal acquisition module is arranged for receiving
The RF Signal in Digital Cable TV System of 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 spectrum number of DTV designated frequency band
According to, then export to data processing module；
Described data processing module data to receiving or process the letter obtaining digital catv signal
Number quality index, and by the communication module that is attached thereto by the data received and/or the monitoring number after processing
According to transmission to host computer；
Described data processing module also/or be arranged for according to set criteria thresholds Judging index fault go forward side by side
Row affair alarm triggers.
In further embodiment, described signal acquisition module include low noise amplifier, the first acquisition channel with
And second acquisition channel, low noise amplifier is arranged for the digital television signal of input is carried out power amplification
Process, wherein:
Described first acquisition channel includes tuner component, filter assembly and the QAM demodulation being sequentially connected with
Device assembly: described tuner component is connected to the outfan of low noise amplifier, it is based on the monitoring channel set
Frequency, symbol rate and modulation format choose the N number of different numeral in the spectrum signal of digital television signal
Television channel, and above-mentioned N number of different digital TV channel is down-converted to base band simultaneously；Described wave filter
Assembly is arranged for other all of channel spectrum filtering outside the N number of digital TV channel needed for monitoring；
Qam demodulator assembly has N number of qam demodulator, is respectively completed described by N number of qam demodulator
The demodulating process of the QAM modulation of N number of different digital TV channel, N >=2, recover binary system I/Q and divide
Amount signal is also transferred to data processing module；
High-speed ADC module that described second acquisition channel includes being sequentially connected with, channel equalization module and up and down
Line frequency spectrum acquisition module: high-speed ADC module is connected to the outfan of low noise amplifier, its numeral to input
The spectrum signal of the designated frequency range of TV signal carries out high speed analog-to-digital conversion, and forms corresponding frequency spectrum letter
Number；Channel equalization module is arranged for the digital signal after conversion is carried out channel transfer characteristic
Compensation optimizing；Described up-downgoing Spectral acquisition module is arranged for carrying out up-downgoing all-channel Spectral acquisition,
Obtain in full frequencies in digital TV road each frequency and the corresponding relation of signal intensity and be transferred to data and process mould
Block.
From above the technical solution of the utility model, compared with prior art, of the present utility model significantly
Advantage is:
1, real time digital television all-channel spectrum monitoring, signal quality of digital television index of the present utility model
Monitoring device, is the monitoring device towards QAM signal monitoring of a kind of high density, low cost, can accomplish number
The real-time crawl of word TV QAM up-downgoing all-channel frequency spectrum, the real-time monitoring of QAM signal index, reach
High-quality, efficient DTV QAM signal monitoring；
Conventional digital TV spectrum monitoring means can only use DTV audiofrequency spectrometer, and this product price is the most expensive,
Also be inconvenient to carry, on cost and in utilization scene, be also not suitable at each transmission core node of DTV
Upper large-scale use.This utility model can facilitate each node at digital television transfer link to use, and base
Relatively low in the monitoring mode not only product price of high speed all-channel Spectral acquisition technology, more convenient large-scale use
Realize omnibearing DTV link detecting, at each joint of digital television transfer, number can be obtained in real time
Word TV up-downgoing all-channel frequency spectrum, can obtain real-time frequency signal intensity, channel noise by frequency spectrum data
Than etc., can be that the safe transmission of digital television signal provides reliable guarantee；
2, monitoring device of the present utility model uses single port multifrequency point monitoring mode, disposably can will transmit number
In the coaxial cable of word TV signal, the signal index under multiple channels all obtains, and efficiency is high, and is to hold
Continuous 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
Use QAM demodulation mode, frequencies all in DTV are each demodulated with single port single-frequency point QAM
Mode be demodulated understanding the signal quality of each QAM frequency.DTV based on this technology is believed
Number monitoring device not only cost is expensive, signal monitoring poor real, equipment is huge can not cover DTV each
The monitoring of transmission point.Therefore this utility model uses the digital television signal of highdensity single port multifrequency point to enter
Row monitoring, can be greatly improved the density of monitoring device, the digital television monitoring of each node of digital television transfer
Device be no longer necessary to large volume, big power consumption, high cost monitoring device, instead low cost, highly dense
The monitoring device of intensity, can be that the safe transmission of digital television signal provides reliable guarantee.
Only should be appreciated that all combinations of aforementioned concepts and the extra design described in greater detail below
Can be viewed as in the case of such design is the most conflicting the disclosure utility model theme one
Part.It addition, all combinations of theme required for protection are considered as the utility model theme of the disclosure
A part.
Can be more fully appreciated with from the following description in conjunction with accompanying drawing this utility model teaching aforementioned and its
His aspect, embodiment and feature.The spy of other additional aspect such as illustrative embodiments of the present utility model
Levy and/or beneficial effect will be the most obvious, or concrete real by instruct according to this utility model
Execute in the practice of mode and learn.
Accompanying drawing explanation
Accompanying drawing is not intended to drawn to scale.In the accompanying drawings, each identical or approximation phase illustrated in each figure
Same ingredient can be indicated by the same numeral.For clarity, in each figure, the most each
Ingredient is the most labeled.Now, will be by example and of the present utility model each side is described in reference to the drawings
The embodiment in face, wherein:
Fig. 1 is the signal quality monitoring device of the digital television signal according to some embodiment of this utility model
Structural representation.
Fig. 2 is the signal quality monitoring device of the digital television signal according to some embodiment of this utility model
The principle schematic of signal acquisition module.
Fig. 3 is the signal quality monitoring principle of the digital television signal according to some embodiment of this utility model
Schematic diagram.
Fig. 4 is that the signal quality monitoring device of the digital television signal according to some embodiment of this utility model should
Theory diagram for digital TV front-end.
Fig. 5 is that the signal quality monitoring device of the digital television signal according to some embodiment of this utility model should
Theory diagram for DTV sub-headend.
Detailed description of the invention
In order to know more about technology contents of the present utility model, especially exemplified by specific embodiment and coordinate institute's accompanying drawings explanation
As follows.
It is described with reference to each side of the present utility model in the disclosure, illustrates shown in the drawings of many
Embodiment.Embodiment of the disclosure and must not be intended to include all aspects of the present utility model.Should be appreciated that
Multiple design presented hereinbefore and embodiment, and those design and the embodiment party described in more detail below
Formula can in many ways in any one is implemented, this is because design disclosed in the utility model and reality
Execute example and be not limited to any embodiment.It addition, the discloseder aspects of this utility model can be used alone,
Or otherwise any appropriately combined use disclosed in this utility model.
Shown in Fig. 1, Fig. 2, according to embodiment of the present utility model, a kind of cable digital TV radio frequency letter
Number signal quality monitoring device, including signal acquisition module, data processing module, communication module, power supply.
Whole signal quality monitoring device is connected with host computer.
At the signal core that signal acquisition module, data processing module, communication module and electric power generating composition are single
Reason chip unit, signal more than concurrent processing N road obtains signal index simultaneously, can realize concurrent processing N
Road numbers above TV band signal monitoring, N >=2, obtain signal index simultaneously；It also is able to look-ahead number
Word TV signal fault and need not use audiofrequency spectrometer just can monitor full frequencies in digital TV road spectrum signal in real time and refer to
Mark.
Such as Fig. 1, signal acquisition module is connected with data processing module, and this signal acquisition module is arranged for connecing
Receive the RF Signal in Digital Cable TV System of input, and carry out QAM demodulation process and 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 is through F
" digital television signal " of type interface enters the monitoring device of this utility model embodiment.
Data processing module data to receiving or process obtain the signal quality of digital television signal and refer to
Mark, transmits supreme by the communication module being attached thereto by the Monitoring Data after the data received and/or process
Position machine；This data processing module also/or be arranged for according to set criteria thresholds Judging index fault go forward side by side
Row affair alarm triggers.
Host computer is for receiving the data that data processing module sends, and the visualization carrying out data presents and logical
Cross the running parameter controlling described data processing module to set signal quality monitoring device, such as signals collecting
The running parameter of module and data processing module sets, the tuner component in especially Fig. 2, bank of filters
Part, the running parameter setting etc. of up-downgoing Spectral acquisition module.
In this example, host computer (is i.e. set by the threshold value arranging the signal quality of digital television index of monitoring
Criteria thresholds), when less 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 this fault occur data type, touch
This value data when sending out time point and the fault of the time that changes；When this DTV index is restored to fault door
Time on limit value, objective can think that this index recovers normal, data processing module can send fault recovery in real time
Information, this information comprises data type that fault recovery occurs, index recovers normal time point and recovery
Time this value data.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 set the work of signal acquisition module by controlling data processing module
Parameter, change monitoring the frequency of qam signal, modulation system, symbol rate, make monitoring have more for
Property.
Shown in Fig. 2, signal acquisition module includes that low noise amplifier, the first acquisition channel and second gather
Passage, low noise amplifier is arranged for the digital television signal of input is carried out power amplification process, with full
The foot subsequent module working condition to signal power.
In conjunction with Fig. 2, Fig. 3, tuner component that the first acquisition channel includes being sequentially connected with, filter assembly with
And qam demodulator assembly: described tuner component is connected to the outfan of low noise amplifier, and it is based on setting
The monitoring frequency of channel, symbol rate and modulation format choose in the spectrum signal of digital television signal N number of
Different digital TV channels, and above-mentioned N number of different digital TV channel is down-converted to base band simultaneously；
Described filter assembly be arranged for filtering outside the N number of digital TV channel needed for monitoring other are all of
Channel spectrum；Qam demodulator assembly has N number of qam demodulator, is divided by N number of qam demodulator
Do not complete the demodulating process of the QAM modulation of described N number of different digital TV channel, recover binary system
I/Q component signal, and it is transferred to data processing module, wherein N is more than or equal to 2.In reality of the present utility model
Executing in example, we illustrate as a example by 8 passage concurrent processing
Digital catv signal enters prison of the present utility model through " digital television signal " of F type interface
Survey device.Through " low noise amplifier " amplifier digital TV signal to meet subsequent module to signal power
Working condition." tuner component " by PC control, the frequency of channel of monitoring required for setting, symbol
Number rate and modulation format, tuner component especially low-power consumption tuner component selects to believe above-mentioned DTV
N number of different digital TV channel in number, and the digital TV channel that 8 different is down-converted to simultaneously
Base band, then filter other outside 8 digital TV channels needed for monitoring by " channel model assembly "
All channel spectrum, to prevent various signal cross-talk.8 " QAM finally by qam demodulator assembly
Demodulator " it is respectively completed the demodulating process of QAM modulation, remove coding checkout, original I/Q signal, so
Original I/Q signal be transferred to data processing module.In conjunction with Fig. 3, it is digital that we are referred to as this monitoring process
TV QAM Monitoring Indexes.
In this example, process radiofrequency signal by tuner component, filter assembly and qam demodulator assembly
After (i.e. digital television signal), the output data of 8 qam demodulators have 8 groups, as example, QAM
The data of demodulator component output include: frequency 115MHz, signal intensity 66.5dbuv, MER-38.7dB,
BER is 0, and number of constellation points is according to [-1 ,-3] [1,3] [1,1] [-3,1] etc., and such data one have 8 groups, because
There are in embodiment of the present utility model 8 channels.
During whole, the numerical value of DTV QAM index, including:
1. the bit error rate, channel after the bit error rate, forward error correction before the signal intensity of digital television signal, forward error correction
Signal to noise ratio, tuner locked condition, code stream sync status, can be directly from qam demodulator volume output result
Read；
The real-time planisphere of 2.QAM frequency, is recovered binary system I/Q component signal by QAM demodulation and draws
Complete；
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 to characterize numeral electricity
Depending on the probability of signal errors, modulate the bit error rate by data processing module by recovering binary system I/Q component signal
Calculating completes, and the calculating of the bit error rate can use existing computational algorithm to realize.
Shown in Fig. 1, Fig. 2, Fig. 3, high-speed ADC module that the second acquisition channel includes being sequentially connected with,
Channel equalization module and up-downgoing Spectral acquisition module: high-speed ADC module is connected to the defeated of low noise amplifier
Going out end, the spectrum signal of the designated frequency range of the RF Signal in Digital Cable TV System of input is carried out at a high speed by it
Analog digital conversion, and form corresponding spectrum signal data；After channel equalization module is arranged for conversion
Digital signal carry out the compensation optimizing of channel transfer characteristic；Described up-downgoing Spectral acquisition module is set use
In carrying out full frequencies in digital TV road Spectral acquisition, complete last FFT computing, obtain full frequencies in digital TV road
Each frequency and the corresponding relation of signal intensity be transferred to data processing module in frequency spectrum.In conjunction with Fig. 3, this
Monitoring process we be referred to as full frequencies in digital TV road spectrum monitoring.
As example, up-downgoing Spectral acquisition module exports concrete data and can be understood as including: 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, complete the analog digital conversion to digital television signal by high-speed ADC module, turn
Being changed 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
The original process to the data collected is completed again, with " frequency through up-downgoing Spectral acquisition module
=XXX-MHz, signal intensity=XXXdBuv " " frequency=YYY-MHz, signal intensity=ZZZdBuv "
Etc. form, the corresponding relation of each frequency in DTV frequency range entire spectrum and signal intensity is presented to data
Processing module, the latter just can directly draw out DTV up-downgoing all-channel frequency spectrum.This be one in real time complete
Channel spectrum monitoring process.
Shown in Fig. 1, Fig. 2, the quality indication signal data that data processing module obtains and the warning of setting
Thresholding compares, if exceed the bound of alarm threshold, sends warning message to upper by communication module
Position machine.The achievement data obtained when data processing module is in the range of the alarm threshold set, by communication mould
Block sends signal to host computer and normally notifies.
In embodiment of the present utility model, the quality index of digital signal quality monitoring specifically includes that
Signal intensity: the index that signal is strong and weak, in certain embodiments, signal in setting data processing module
The threshold range of intensity is 65-75dBuV.
Modulation Error Rate: refer to single " quality factor " of received signals, in certain embodiments, if
In given data processing module, the threshold value of signal intensity is 30dB.
Signal to noise ratio: refer to signal and the ratio of noise in an electronic equipment or electronic system, real at some
Executing in example, in setting data processing module, the value of signal intensity is 30dB.
The bit error rate: be the index weighing data data at the appointed time transmission accuracy, in some embodiments
In, 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:
The data exported the first acquisition channel and the second acquisition channel by data processing module are processed
To 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 obtain spectrum signal intensity,
Signal to noise ratio etc..
The data processing module signal intensity to collecting carries out the bound of threshold value and judges, if the letter gathered
Number intensity is not when setting the scope of thresholding A-B dBuV, and data processing module is to host computer strength of transmitted signals
Datagram alarming information；If the signal intensity gathered returns in normal range, then send data and recover normal
Instruction.
Data processing module carries out the bound of threshold value and judges Modulation Error Rate, and the Modulation Error Rate of collection is low
When setting value, data processing module sends Modulation Error Rate datagram alarming information to host computer；If gathering
When modulation error returns to more than or equal to setting value, then send data and recover normal instructions.
Data processing module carries out the bound of threshold value and judges signal to noise ratio, gathers the signal to noise ratio of signal less than setting
When determining threshold value, data processing module sends signal-to-noise ratio data warning message to host computer；If the signal to noise ratio gathered
Return to more than or equal to when setting threshold value, then send data and recover normal instructions.
Data processing module carries out threshold value bound judgement to the bit error rate, 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 be less than
Equal to during with predetermined value, then send data and recover normal instructions.
Host computer receives and video data processing module exports datagram alarming information and data normal instructions, and can
Present to user in visual mode, intuitively arrive the quality index situation of digital television signal.
During real time monitoring, when quality problems occurs in digital television signal, remind relevant staff in time
Noting the reason of relevant appearance quality, reason fault occur is adjusted.
As seen from the above embodiment, utilizing quality indication signal monitoring system of the present utility model, being first can
With the full frequencies in digital TV road frequency spectrum in this root copper cash of the coaxial cable of transmitting digital TV signal in real time in
Existing, and the speed presented is very fast, and 1 second i.e. refreshable more than ten times are the most, next to that high integration,
Single port can complete multi channel DTV index and monitor in real time, and to complete this index in prior art
Monitoring in real time can only realize with audiofrequency spectrometer, this monitoring mode time-intensive, expensive, it is impossible to meet television transmission
The requirement of full monitoring, and monitoring device of the present utility model is disposable coaxial by transmitting digital TV signal
In cable, the signal index under multiple channels all obtains, such as signal intensity, signal to noise ratio, the bit error rate, locking
State etc.；And existing product is all 1 the channel poll collection of one master chip of 1 equipment, this practicality is new
In type scheme, individual signals kernel processor chip unit just can more than concurrent processing N road (N >=2) DTV frequency
Segment signal monitor, high integration and be all Real-time Collection.
In embodiment of the present utility model, communication module can be the RJ45 interface containing Ethernet, and host computer can
To read relevant Monitoring Data to communication module connection by Ethernet, to obtain warning message etc.；Communication module
Can also be CableModerm Cable Modem, relevant information is transferred in coaxial cable
CMTS signal, host computer can be connected by the CMTS signal after coaxial cable read relevant Monitoring Data,
Obtain warning message, it is not necessary to lay netting twine again.
As preferred scheme, communication module can be the network topology structure utilizing Ethernet netting twine to be formed or
Utilizing the network topology structure that cablemoderm is formed, 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,
Host computer is by adjusting setting alarm threshold, and can according to circumstances change frequency or the modulation methods of monitoring QAM signal
Formula, makes monitoring have more specific aim.
Be respectively shown in Fig. 4 and Fig. 5 signal quality monitoring device of the present utility model at digital TV front-end or
The application of DTV sub-headend, digital television signal monitoring device of the present utility model can be respectively arranged at number
Word television headend or DTV sub-headend, monitor the quality of digital television signal under different duties
Index.
As shown in Figure 4, when digital television signal monitoring device is arranged on digital TV front-end, in monitoring point 1,
2 can be to the active and standby road radio frequency output signal monitoring before radio-frequency (RF) switch, it appeared that the asking of active and standby modulating system
Topic；Radio frequency switching switch output signal can be carried out passive mixing, to mixed signal in monitoring point 3
It is monitored, it appeared that switching switch and the problem of signal mixing point；Can be to active and standby in monitoring point 4,5
Light signals and is monitored, and finds the problem that light sends out equipment.
In conjunction with Fig. 1, Fig. 4, the digital television signal monitoring device of this utility model embodiment can be to multiple through front end
With, encode, scramble and active and standby road radiofrequency signal after QAM rf modulations, the radiofrequency signal after switching,
It is monitored by the radiofrequency signal before and after the mixed radiofrequency signal of blender and light method.By observing numeral
Index is monitored by each frequency channel flatness of television spectrum, each frequency signal to noise ratio etc.；Pass through observed number
The bit error rate, channel after the bit error rate, forward error correction before each frequency signal intensity of word television spectrum, forward error correction
Index is monitored by signal to noise ratio, the modulation bit error rate, tuner locked condition, code stream sync status etc..Number
Each monitoring point of word television headend is as all used this digital television monitoring device based on high speed Spectral acquisition, energy
Conveniently discover whether that equipment operation irregularity causes the problems such as DTV index cracking, digital television signal in real time
In no there is 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, in monitoring
Point 1,2 can monitor the signal output that active and standby light is received；Each hybrid digital TV, mutually can be monitored in monitoring point 3
The packet output of dynamic VOD and broadband CMTS signal；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 this utility model embodiment is for numeral electricity
The optical signal come depending on front end delivery receives through light, be assigned to interactive VOD mixing before spectrum signal carry out by
Level multiple spot monitoring, the whole network QAM signal that extension set room mixed interactive VOD, CMTS signal is supervised
Surveying, monitoring point is generally the QAM signal after light is sent out.Put down by observing each frequency channel of numeral television spectrum
Index is monitored by smooth degree, each frequency signal to noise ratio etc.；By observing each frequency signal of numeral television spectrum
The bit error rate after the bit error rate, forward error correction before signal intensity, forward error correction, channel SNRs, the modulation bit error rate,
Index is monitored by tuner locked condition, code stream sync status etc..Each monitoring of DTV sub-headend
Point, as all used this digital television monitoring scheme based on high speed Spectral acquisition, can conveniently realize being the discovery that in real time
No have equipment operation irregularity to cause the problems such as DTV index cracking, if there is spectral interference, clutter, mix
Frequency etc. has 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 this utility model embodiment is used for DTV
When front end, the upward signal of sub-headend are monitored, digital television signal monitoring device is in DTV sub-headend profit
The monitoring of the uplink spectrum to CMTS or various EOC equipment is completed, by a high speed, in real time by this monitoring device
Crawl up all-channel frequency spectrum data, by the crawl of uplink spectrum data being obtained the passback of burst type
Noise, out of band signal interference noise, link inactive component reflecting background etc., this detection is to digital television transfer
The existing upward signal malfunction elimination of system is meaningful, can position upward signal interference, fault quickly and accurately
Trouble point, more can give warning in advance, prevent trouble before it happens.
Although this utility model is disclosed above with preferred embodiment, so it is not limited to this utility model.
This utility model art has usually intellectual, without departing from spirit of the present utility model and model
In enclosing, when being used for a variety of modifications and variations.Therefore, protection domain of the present utility model is when regarding claim
Book defined person be as the criterion.
Claims (5)
1. the signal quality monitoring device of a RF Signal in Digital Cable TV System, it is characterised in that include letter
Number acquisition module, data processing module, communication module and power supply, this signal acquisition module, data process
The single core signal of module, communication module and electric power generating composition processes chip unit, concurrent processing N road with
On signal obtain signal index simultaneously, N >=2, wherein:
Described power module is described signal acquisition module, data processing module, communication module provide power supply to supply
Should；
Described signal acquisition module is connected with data processing module, and this signal acquisition module is arranged for receiving
The RF Signal in Digital Cable TV System of 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 spectrum number of DTV designated frequency band
According to, then export to data processing module；
Described communication module is connected with data processing module, leads to for the data providing data processing module external
Letter, sets up communication link between data processing module and the host computer of outside；
Described data processing module data to receiving or process the letter obtaining digital catv signal
Number quality index, by the communication module that is attached thereto by the data received and/or the Monitoring Data after processing
Transmission is 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 triggers.
The signal quality monitoring device of RF Signal in Digital Cable TV System the most according to claim 1, its
Being characterised by, it is logical that described signal acquisition module includes that low noise amplifier, the first acquisition channel and second gather
Road, low noise amplifier is arranged for the RF Signal in Digital Cable TV System of input is carried out power amplification process,
Wherein:
Described first acquisition channel includes tuner component, filter assembly and the QAM demodulation being sequentially connected with
Device assembly: described tuner component is connected to the outfan of low noise amplifier, it is based on the monitoring channel set
Frequency, symbol rate and modulation format choose the N number of different numeral electricity in RF Signal in Digital Cable TV System
Tv channel, and above-mentioned N number of different digital TV channel is down-converted to base band simultaneously；Described bank of filters
Part is arranged for other all of channel spectrum filtering outside the N number of digital TV channel needed for monitoring；
Qam demodulator assembly has N number of qam demodulator, is respectively completed described by N number of qam demodulator
The QAM demodulating process of N number of different digital TV channel, N >=2, recover binary system I/Q component signal
Process, and be transferred to data processing module；
High-speed ADC module that described second acquisition channel includes being sequentially connected with, channel equalization module and up and down
Line frequency spectrum acquisition module: high-speed ADC module is connected to the outfan of low noise amplifier, and it is wired to input
The spectrum signal of the designated frequency range of digital television radio-frequency signal carries out high speed analog-to-digital conversion, and is formed corresponding
Spectrum signal data；Channel equalization module is arranged for the digital signal after conversion is carried out channel biography
The compensation optimizing of defeated characteristic；Described up-downgoing Spectral acquisition module is arranged for carrying out DTV frequency spectrum and adopts
Collection, obtains in digital television radio-frequency signal each frequency and the corresponding relation of signal intensity and is transferred to data and processes
Module.
The signal quality monitoring device of RF Signal in Digital Cable TV System the most according to claim 1 and 2,
It is characterized in that, the running parameter scalable of described signal acquisition module, described running parameter includes that QAM adjusts
The frequency of signal processed, modulation system, symbol rate.
The signal quality monitoring device of RF Signal in Digital Cable TV System the most according to claim 2, its
Being characterised by, described data processing module is in response to the signal intensity of Real-time Collection, Modulation Error Rate, noise
Than and the bit error rate in any one exceed the bound alert of alarm threshold, and in response to
Signal intensity, Modulation Error Rate, signal to noise ratio and the bit error rate send in the range of returning to alarm threshold bound
Signal normal information.
The signal quality monitoring device of RF Signal in Digital Cable TV System the most according to claim 1, its
Being characterised by, described data processing module is provided with temperature and/or humidity compensating module.
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| CN105763874A (en) * | 2016-04-22 | 2016-07-13 | 南京睿高宇信息科技有限公司 | Signal quality monitoring device of cable digital television radio frequency signal and monitoring method thereof |
| CN107888901A (en) * | 2016-09-29 | 2018-04-06 | 国家新闻出版广电总局广播科学研究院 | TV signal monitoring method and apparatus |
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| CN105763874A (en) * | 2016-04-22 | 2016-07-13 | 南京睿高宇信息科技有限公司 | Signal quality monitoring device of cable digital television radio frequency signal and monitoring method thereof |
| CN105763874B (en) * | 2016-04-22 | 2018-02-02 | 南京睿高宇信息科技有限公司 | The signal quality monitoring device and monitoring method of RF Signal in Digital Cable TV System |
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| CN108055224B (en) * | 2017-12-07 | 2020-07-21 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Synchronous locking detection method for 16QAM carrier synchronization loop |
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