CN103037239A - System and method for testing receiving performance of digital video receiving terminal - Google Patents
System and method for testing receiving performance of digital video receiving terminal Download PDFInfo
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- CN103037239A CN103037239A CN2011103070036A CN201110307003A CN103037239A CN 103037239 A CN103037239 A CN 103037239A CN 2011103070036 A CN2011103070036 A CN 2011103070036A CN 201110307003 A CN201110307003 A CN 201110307003A CN 103037239 A CN103037239 A CN 103037239A
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Abstract
The invention provides a system and a method for testing receiving performance of a digital video receiving terminal. Parameters are arranged in a control device to control a signal generating device to generate a radio frequency signal, the digital video receiving terminal receives the radio frequency signal and carries out demodulation, a signal estimation device estimates the demodulated signal, and a to-be-tested parameter is adjusted according to an estimation result by the control device until a threshold value of the to-be-tested parameter is confirmed. According to the system and the method for testing the receiving performance of the digital video receiving terminal, due to the fact that the control device and the signal estimation device are added, a feedback system is formed by the control device, the signal estimation device, the digital video receiving terminal and the signal generating device, a test can be carried out automatically with only a necessary testing item and a parameter provided, manual work is not needed, and testing accuracy is greatly improved.
Description
Technical field
The present invention relates to the video terminal technical field, particularly a kind of test macro and method of digital video receiving terminal receptivity.
Background technology
Digital video receiving terminal receptivity can represent with some indexs usually, such as signal strength signal intensity, signal to noise ratio, modulation bandwidth, with frequently or face frequently the parameter such as interference strength.Tester's work need to detect the threshold value of these parameters exactly one by one, thereby assesses the receptivity of this terminal.When certain individual event test item of test, the tester can fix some parameter, only changes parameter to be measured.When the individual event test finishes, just can know the result of this parameter to be measured.
Therefore, test is a very loaded down with trivial details job.At first, the tester needs by hand various parameters to be set and comes the control signal generation to produce qualified radiofrequency signal, and the signal that this radiofrequency signal analog video digitizer receiving terminal receives also inputs to the data video receiving terminal.The digital video receiving terminal is according to the signal display frame that receives, and whether the tester recycles self experience artificial judgment picture normal.This method is the significant wastage manpower not only, and because test result is relevant with tester's subjective judgement, also inaccurate in the extreme.
Summary of the invention
The invention provides a kind of test macro and method of digital video receiving terminal receptivity, can avoid manual operation, greatly save human resources and improve the accuracy of test.
For reaching above-mentioned first purpose, technical scheme provided by the invention is:
A kind of test macro of digital video receiving terminal receptivity comprises digital video receiving terminal, signal generating apparatus, and this system also comprises: control appliance and signal evaluation equipment;
Described control appliance is used for when the single test item of test, and the preset parameter and the parameter to be measured that arrange for this test item produce radiofrequency signal to control described signal generating apparatus; Also be used for receiving the assessment result by the output of signal evaluation equipment, adjust parameter to be measured according to this assessment result and regenerate radiofrequency signal to control described signal generating apparatus, until determine the threshold value of parameter to be measured, and with the test result of this threshold value as parameter to be measured;
Described signal generating apparatus, according to described control appliance for preset parameter and the Parameter Modulation to be measured of test item setting and export radiofrequency signal and give described digital video receiving terminal;
Described digital video receiving terminal is used for receiving the radiofrequency signal from signal generating apparatus, and with this radiofrequency signal demodulation;
Described signal evaluation equipment is used for the signal after the demodulation of digital video reception terminal is carried out normal or unusual assessment, and assessment result is exported to described control appliance.
In the such scheme, described control appliance comprises:
Memory cell is used for preset parameter and parameter to be measured that storage arranges for test item;
Transmit-Receive Unit is used for and will exports to signal generating apparatus for preset parameter and the parameter to be measured of test item setting; Also be used for receiving the assessment result by the output of signal evaluation equipment;
Adjustment unit is used for adjusting parameter to be measured according to described assessment result and regenerates radiofrequency signal to control described signal generating apparatus, until determine the threshold value of parameter to be measured, and with the test result of this threshold value as parameter to be measured.
In the such scheme, described signal evaluation equipment comprises:
Transmit-Receive Unit be used for to receive signal or the value relevant with the error rate after the demodulation of described digital video receiving terminal input; Also be used for the assessment result that analytic unit is determined is exported to described control appliance;
Analytic unit is used for according to the signal after the demodulation number of erroneous packets being added up, and determines the actual error rate according to the number of erroneous packets, relatively determines assessment result by the actual error rate and the standard error code check that sets in advance again; Perhaps directly obtain the value relevant with the error rate from described digital video receiving terminal, to determine the actual error rate, again by relatively more definite assessment result of the actual error rate and the standard error code check that sets in advance.
In the such scheme, described control appliance is PC or programmable intelligent machine.
In the such scheme, described control appliance be connected signal generating apparatus and connect by serial ports, network interface or general-purpose interface bus GPIB, described control appliance be connected serial ports, network interface connection with the digital video receiving terminal.
For second goal of the invention, the technical scheme that the present invention proposes is:
A kind of method of testing that is applied to the described system of claim 1, the method comprises:
A, control appliance setting produce radiofrequency signal for preset parameter and the parameter to be measured of test item with the control signal generation;
B, digital video receiving terminal receive the radiofrequency signal from signal generating apparatus, and with this radiofrequency signal demodulation;
C, the signal evaluation equipment signal after to the demodulation of digital video reception terminal carries out normal or unusual assessment, and assessment result is exported to described control appliance;
D, described control appliance are adjusted parameter to be measured according to this assessment result, and return steps A and carry out, until determine the threshold value of parameter to be measured, and with the test result of this threshold value as parameter to be measured.
In the such scheme, also further comprise before the step B: control appliance control figure video reception terminal is carried out initialization, makes the digital video receiving terminal be in tested state.
In the such scheme, described step C comprises:
Described signal evaluation equipment receives the signal after the demodulation of described digital video receiving terminal input, according to the signal after the demodulation number of erroneous packets is added up, determine the actual error rate according to the number of erroneous packets, again by the actual error rate and the standard error code check that sets in advance relatively determine assessment result, and assessment result is exported to described control appliance.
In the such scheme, described step C comprises:
Described signal evaluation equipment obtains the value relevant with the error rate from described digital video receiving terminal, to determine the actual error rate, again by relatively more definite assessment result of the actual error rate and the standard error code check that sets in advance.
To sum up, the invention provides a kind of test macro and method of digital video receiving terminal receptivity, control appliance and signal evaluation equipment have been increased newly, make itself and digital video receiving terminal and signal generating apparatus consist of a reponse system, as long as necessary test item and parameter is provided, just can automatically test, need not artificial participation, also greatly improve and tested accuracy.
Description of drawings
Fig. 1 is the test system structure schematic diagram of digital video receiving terminal receptivity of the present invention.
Fig. 2 is the method flow diagram that the present invention carries out performance test to digital video reception terminal.
Fig. 3 is the embodiment of the internal structure of control appliance 101 among the present invention.
Fig. 4 is the embodiment of the internal structure of signal evaluation equipment 104 among the present invention.
Fig. 5 is the embodiment of the test macro of another digital video receiving terminal receptivity of the present invention.
Embodiment
Basic thought of the present invention is to increase a control appliance and signal evaluation equipment, and itself and digital video receiving terminal, signal generating apparatus are formed the reponse system of closing circulation.Control appliance arranges series of parameters, produces the radiofrequency signal that satisfies condition with the control signal generation, and analog input is to the signal of digital video receiving terminal.The digital video receiving terminal carries out demodulation with the signal that receives, and gives signal evaluation equipment and assess.Control appliance determines whether to readjust parameter according to the result of signal evaluation again, regenerates radiofrequency signal with the control signal generation, until control appliance finishes the detection to certain single test item.
Fig. 1 is the test macro that the present invention realizes digital video receiving terminal receptivity.As shown in Figure 1, this system comprises: control appliance 101, signal generating apparatus 102, digital video receiving terminal 103, signal evaluation equipment 104.
Wherein, control appliance 101 and signal evaluation equipment 104 are device or modules that the present invention increases newly, signal generating apparatus 102 can use existing equipment in the prior art, and digital video receiving terminal 103 then is the target that the present invention need to test, and detects the quality of its receptivity.
The below specifically describes the function of each equipment in this system:
1) control appliance 101, are used for arranging preset parameter and parameter to be measured for the test item of user's appointment, produce radiofrequency signal to control described signal generating apparatus 102; Also be used for receiving the assessment result by 104 outputs of signal evaluation equipment, adjust parameter to be measured according to this assessment result and regenerate radiofrequency signal with control signal generation 102, until determine the threshold value of parameter to be measured, at last with the test result of this threshold value as this parameter to be measured.
2) signal generating apparatus 102, and its effect is to produce radiofrequency signal according to control appliance 101 for preset parameter and the Parameter Modulation to be measured that test item arranges, and radiofrequency signal is exported to digital video receiving terminal 103.
3) the digital video receiving terminal 103, and its effect is the radiofrequency signal that receives from signal generating apparatus 102, and with this radiofrequency signal demodulation.
4) signal evaluation equipment 104, and its effect is that the signal after digital video reception terminal 103 demodulation is carried out normal or unusual assessment, and assessment result is exported to control appliance 101.
Fig. 2 is the method flow diagram that utilizes said system that digital video reception terminal is carried out performance test.As shown in Figure 2, the method comprises:
Step 201: control appliance 101 arranges for the preset parameter of test item and parameter to be measured and produces radiofrequency signal with control signal generation 102.
Preset parameter described here and parameter to be measured all are the parameters that need to input to signal generating apparatus 102, and its concrete kind is different with different test items.Such as: when this performance of test signal sensitivity, channel model that modulation system, frequency, symbol rate, modulation bandwidth, signal to noise ratio, multipath disturb can be set in advance, with frequently or face frequently the parameter such as interference strength, and with these parameters as preset parameter, in this individual event test, no longer change.Simultaneously, also need signalization intensity, but this parameter may change in this individual event test, namely signal strength signal intensity is exactly parameter to be measured in this individual event test.Control appliance 101 inputs to signal generating apparatus 102 in the lump with preset parameter and parameter to be measured, and signal generating apparatus 102 just can produce the radiofrequency signal that meets these Parameter Conditions.How to produce radiofrequency signal as for signal generating apparatus 102 and then belong to prior art, repeat no more herein.
Assessment result described here can be the normal or unusual evaluation result of signal, and its appraisal procedure will be described in detail in the signal evaluation equipment 104 below.Control appliance 101 can judge that whether the parameter to be measured of Set For Current has reached threshold value, if so, then stops to detect this individual event test item, with the test result of this threshold value as parameter to be measured according to assessment result; Otherwise, just readjust this parameter to be measured.That is to say that threshold value described here is the critical value that causes signal normal and unusual, can embody the receptivity of tested terminal, its implication is identical with implication of the prior art, repeats no more herein.
In the practical application, if with the function modoularization of control appliance 101, an embodiment of its internal structure can as shown in Figure 3, comprise:
Memory cell 301 is used for preset parameter and parameter to be measured that storage arranges for test item.
Transmit-Receive Unit 302 is used for and will exports to signal generating apparatus 102 for preset parameter and the parameter to be measured of test item setting; Also be used for receiving the assessment result by 104 outputs of signal evaluation equipment.
Adjustment unit 303 is used for adjusting parameter to be measured according to described assessment result and regenerates radiofrequency signal with control signal generation 102, until determine the threshold value of parameter to be measured, and with the test result of this threshold value as parameter to be measured.
Step 202: the radiofrequency signal that digital video receiving terminal 103 receives from signal generating apparatus 102, and with this radiofrequency signal demodulation.
Digital video receiving terminal 103 of the present invention is target devices to be detected, can automatically radiofrequency signal be carried out demodulation.By the artificial judgment picture normally whether different from prior art test performance method is, because the present invention detects automatically by system, to need not, so the digital video receiving terminal 103 among the present invention need not the information after the demodulation is shown, and only demodulation gets final product.
In the practical application, if digital video receiving terminal 103 is not in tested state, can also before step 102, carry out initialization by control appliance 101 control figure video reception terminals 103, make digital video receiving terminal 103 be in tested state.Certainly, if digital video receiving terminal 103 has been in tested state, just can omit this step.
In addition, signal generating apparatus 102 of the present invention can utilize existing equipment, such as signal generating apparatus SFU of Rohde ﹠ Schwarz Representative Office etc.Signal generating apparatus 102 has externally usually by control interface, can receive from the set parameter of control appliance 101.
Step 203: the signal after 104 pairs of digital video reception terminal 103 demodulation of signal evaluation equipment carries out normal or unusual assessment, and assessment result is exported to control appliance 101.
In the practical application, signal evaluation equipment 104 can be used as a module and is arranged on control appliance 101 inside, also can be used as one independently equipment be arranged on the outside.When realizing assessment, signal evaluation equipment 104 can adopt the mode of software, also can adopt the mode of hardware.
If adopt the mode of software, signal evaluation equipment 104 can directly read the value in the register in the demodulator chip, and this value is relevant with the error rate, and then determines the actual error rate according to this value.In the prior art, digital video receiving terminal 103 inside can be added up the erroneous packets of code stream after the demodulation automatically, and the value that will be correlated with is kept in certain register of demodulator chip, and signal evaluation equipment 104 can obtain the error rate according to this value.How to obtain the value relevant with the error rate as for the demodulator chip of digital video receiving terminal 103 and belong to prior art, how signal evaluation equipment 104 determines that according to this value the error rate also is easy to realize, repeats no more herein.
If adopt the mode of hardware, signal evaluation equipment 104 can receive from the signal after 103 demodulation of digital video receiving terminal, by the number of erroneous packets in the signal that utilizes counter after the demodulation of in setting time statistics, then determine the actual error rate according to the number of erroneous packets.
No matter adopt the mode of hardware or the mode of software, signal evaluation equipment 104 can determine that signal is normal or unusual under the condition of the parameter of Set For Current according to the error rate.This is because digital video receiving terminal 103 has the evaluation criterion of International or National regulation, such as the SPEC standard.Standard code, after the actual error rate of signal after the demodulation was above standard the error rate, the picture that its signal demonstrates was undesirable, otherwise then met the requirements.Therefore, the signal evaluation equipment among the present invention 104 is normal or unusual according to the assessment result of relatively determining of the actual error rate and standard error code check exactly.Certainly, different evaluation criterions is arranged in the practical application, the user who uses the present invention program can determine voluntarily.
In the practical application, if with the function modoularization of signal evaluation equipment 104, an embodiment of its internal structure comprises as shown in Figure 4:
Transmit-Receive Unit 401 be used for to receive signal or the value relevant with the error rate after the demodulation of digital video receiving terminal 103 inputs; Also be used for the assessment result that analytic unit 402 is determined is exported to control appliance 101;
Analytic unit 402 is used for according to the signal after the demodulation number of erroneous packets being added up, and determines the actual error rate according to the number of erroneous packets, relatively determines assessment result by the actual error rate and the standard error code check that sets in advance again; Perhaps directly obtain the value relevant with the error rate from digital video receiving terminal 103, to determine the actual error rate, again by relatively more definite assessment result of the actual error rate and the standard error code check that sets in advance.
Step 204: control appliance 101 is adjusted parameter to be measured according to this assessment result, and returns step 201 and carry out, until determine the threshold value of parameter to be measured, and with the test result of this threshold value as parameter to be measured.
If control appliance 101 does not determine to make the critical value of signal between normal and unusual, namely can't determine the threshold value of parameter to be measured, just need to adjust parameter to be measured.Control appliance 101 determines how to adjust parameter to be measured according to assessment result and with reference to default adjustment strategy.Adjustment strategy in the practical application is a lot, such as: set in advance the step-length of each adjustment and the number of times of circulation, just stop to adjust when reaching cycle-index; Perhaps, set in advance the step-length of each adjustment and the precision that need to reach, when parameter to be measured reaches precision, stop to adjust; Again or, predesignate at every turn the rule adjustment according to " dichotomy ", and cycle-index be set, when arriving cycle-index, stop to adjust.In a word, how adjusting parameter to be detected has a lot of methods, specifically can be determined voluntarily by the user who uses the present invention program, repeats no more herein.
The below enumerates a preferred embodiment explanation the present invention program:
In the practical application, the function of the function of control appliance and signal evaluation equipment can be realized by certain computer, also can be realized by two different computers respectively, perhaps can be realized by other any programmable intelligent machines, and be not limited to PC.In the present embodiment, if the function of the function of control appliance and signal evaluation equipment is realized by same computer, just two functional modules can be set therein, i.e. control module 5011 (being control appliance) and signal evaluation module 5012 (being signal evaluation equipment).For easy to operate, UI operation interface 5013 can also also be set in computer, the tester need to select the initiation parameter of test item and signal generating apparatus 502 by this interface.In addition, this computer can also be preserved a script file 5014 in advance, the initiation parameter, the path of resource file, the environment configurations parameter that are used for digital video recording receiving terminal 503, as: the source of video flowing, signal frequency, control mode (serial ports or network interface) etc.
Fig. 6 is the flow chart of present embodiment, comprising:
Step 601: control module 5011 is obtained test item and the initiation parameter that the user need to test by UI operation interface 5013, simultaneously, reads script file 5014 and obtains the initiation parameter relevant with digital video receiving terminal 503.
Such as: the user channel model that selecting modulation mode, symbol rate, modulation bandwidth, signal to noise ratio, signal strength signal intensity, multipath disturb from the UI operation interface, with frequently or face frequently the parameter such as interference strength, and the initial value of these parameters is set.Simultaneously, read the initiation parameter relevant with the digital video receiving terminal by script file.
Step 602: control module 5011 is transferred to digital video receiving terminal 503 with initiation parameter by serial ports or network interface, so that digital video receiving terminal 503 carries out initialization.
Initiation parameter described here is the parameter relevant with digital video receiving terminal 503, control module 5011 can be carried out initialization according to this initiation parameter control figure video reception terminal 503, make digital video receiving terminal 503 be transformed into tested state, ready for follow-up test job.
In addition, control module 5011 can also send to initiation parameter digital video receiving terminal 503 by other means.
Step 603: control module 5011 is transferred to signal generating apparatus 502 with initiation parameter by serial ports or network interface, so that signal generating apparatus 502 carries out initialization.
Initiation parameter described here is the parameter relevant with signal generating apparatus 502.In addition, similar, control module 5011 can also send to initiation parameter signal generating apparatus 502 by other means, such as general-purpose interface bus (GPIB) etc.
Above-mentioned steps 601～603rd, control module 5011 are finished the initialization to digital video reception terminal 503 and signal generating apparatus 502.In the practical application, if the user need to detect a plurality of test items, the described initiation parameter of step 603 refers to and a plurality of test items relevant parameter all so, therefore can shift to an earlier date being transferred in the lump signal generating apparatus 502, follow-up step 604 is transferred to signal generating apparatus 502 with the parameter relevant with single test item again.Certainly, in the practical application, also can parameter be transferred to signal generating apparatus in two steps, this actual practice with the user is relevant, as long as be transferred to signal generating apparatus for preset parameter and the parameter to be measured of test item the most at last.
Step 604: control module 5011 again according to the test item of user selection will be relevant with test item other parameters be transferred to signal generating apparatus 502, thereby make signal generating apparatus 502 produce qualified radiofrequency signal.
" other parameters relevant with test item " described here just refer to that except the initiation parameter of step 603 other make signal generating apparatus 502 produce the parameter of qualified radiofrequency signal.Such as: the current test frequency catching range of wanting of user; after step 603 is transferred to signal generating apparatus 502 with basic initiation parameter, can also other parameters such as frequency, protection interval, constellation number, FEC be transferred to signal generating apparatus 502 in this step.Like this, in the test item of test frequency catching range, frequency is so-called parameter to be measured, and other parameters then are preset parameters.
Step 605: digital video receiving terminal 503 receives the radiofrequency signal from signal generating apparatus 502, and it is carried out demodulation.
This step can be finished voluntarily by digital video receiving terminal 503, carries out demodulation after also can sending the order that starts demodulation by control module 5011 again.
Step 606: signal evaluation module 504 receives from the signal after the demodulation of digital video receiving terminal 503, and it is carried out normal or unusual assessment.As previously mentioned, the signal evaluation module 504 of present embodiment also can adopt software or hardware mode to realize, no longer is repeated in this description herein.
Step 607: signal evaluation module 504 returns to control module 5011 with assessment result.In the practical application, signal evaluation module 504 can certainly be about to assessment result and be returned control module 5011, also can be by control module 5011 active obtainings.
Step 608: control module 5011 judges whether to need to adjust parameter to be measured, if so, then adjusts according to the adjustment strategy that sets in advance, and then returns step 604 and repeats; Otherwise, execution in step 609.
The adjustment strategy of this step is relevant with practical application, and its method can be with reference to the described method of step 204.
Step 609: determine the threshold value of parameter to be measured, this threshold value is preserved as the test result of parameter to be measured.
Step 610: judge whether to test all test items, if so, then withdraw from this flow process; Otherwise, return step 602.
In the practical application, if multinomial test is arranged, then can re-execute according to the method described above step 602～609, obtain one by one the threshold value of each parameter to be measured.Obtain after all test results, control module 5011 can also be analyzed and sum up according to all test results, generates last test report.Certainly, if only have the individual event test, then needn't circulate, can omit step 610.
The below describes as an example of the signal sensitivity test example again:
Circulation time for the first time, the initial value that parameter to be measured (signal strength signal intensity) is set is X1, and the assessment result that signal evaluation module 5012 obtains is for normal, and then control module 5011 decays signal strength signal intensity with-10dbm interval, and obtaining signal strength values is X2;
Circulation time for the second time, the assessment result that signal evaluation module 5012 obtains be for normal, and then control module 5011 continues signal strength signal intensity is decayed with-10dbm interval, and obtaining signal strength values is X3;
Circulation time for the third time, the assessment result that signal evaluation module 5012 obtains illustrates that for unusual (digital video receiving terminal losing lock) threshold value of signal strength signal intensity should be between X2 and X3.So control module 5011 is with the interval readjustment of signal strength signal intensity with 1dbm, obtaining signal strength values is X4;
The 4th circulation time, the assessment result that signal evaluation module 5012 obtains are still for unusual, and control module 5011 continues the interval readjustment of signal strength signal intensity with 1dbm, and obtaining signal strength values is X5;
The 5th circulation time, the assessment result that signal evaluation module 5012 obtains illustrates that for normal (the digital video receiving terminal relocks) threshold value of signal strength signal intensity should be between X4 and X5.So control module 5011 is with the interval deamplification of signal strength signal intensity with 0.1dbm, obtaining signal strength values is X6;
The 6th circulation time, the assessment result that signal evaluation module 5012 obtains is for normal, and control module 5011 is with the interval deamplification of signal strength signal intensity with 0.1dbm, and obtaining signal strength values is X7;
The 7th circulation time, the assessment result that signal evaluation module 5012 obtains illustrates that for unusual (the digital video receiving terminal is losing lock again) threshold value of signal strength signal intensity should be between X6 and X7.So control module 5011 is with the interval readjustment of signal strength signal intensity with 0.02dbm, obtaining signal strength values is X8;
The 8th circulation time, the assessment result that signal evaluation module 5012 obtains is for normal (the digital video receiving terminal locks again), so can be with the threshold value of X8 as signal strength signal intensity.At this moment, the result's of signal sensitivity test item precision is 0.02dbm, if need to improve precision, can also continue circulation and carry out.
Above-mentioned is with the strategy of step-length as adjustment for example, can also adjust strategy according to other in the practical application and adjust parameter to be measured, enumerates no longer one by one herein.
In a word, among the present invention program owing to increased control appliance and signal evaluation equipment newly, can make itself and digital video receiving terminal and signal generating apparatus consist of a reponse system, as long as necessary test item and parameter is provided, just can automatically test, need not artificial participation, also greatly improved and tested accuracy.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (9)
1. the test macro of a digital video receiving terminal receptivity comprises digital video receiving terminal, signal generating apparatus, it is characterized in that, this system also comprises: control appliance and signal evaluation equipment;
Described control appliance is used for when the single test item of test, and the preset parameter and the parameter to be measured that arrange for this test item produce radiofrequency signal to control described signal generating apparatus; Also be used for receiving the assessment result by the output of signal evaluation equipment, adjust parameter to be measured according to this assessment result and regenerate radiofrequency signal to control described signal generating apparatus, until determine the threshold value of parameter to be measured, and with the test result of this threshold value as parameter to be measured;
Described signal generating apparatus, according to described control appliance for preset parameter and the Parameter Modulation to be measured of test item setting and export radiofrequency signal and give described digital video receiving terminal;
Described digital video receiving terminal is used for receiving the radiofrequency signal from signal generating apparatus, and with this radiofrequency signal demodulation;
Described signal evaluation equipment is used for the signal after the demodulation of digital video reception terminal is carried out normal or unusual assessment, and assessment result is exported to described control appliance.
2. system according to claim 1 is characterized in that, described control appliance comprises:
Memory cell is used for preset parameter and parameter to be measured that storage arranges for test item;
Transmit-Receive Unit is used for and will exports to signal generating apparatus for preset parameter and the parameter to be measured of test item setting; Also be used for receiving the assessment result by the output of signal evaluation equipment;
Adjustment unit is used for adjusting parameter to be measured according to described assessment result and regenerates radiofrequency signal to control described signal generating apparatus, until determine the threshold value of parameter to be measured, and with the test result of this threshold value as parameter to be measured.
3. system according to claim 1 and 2 is characterized in that, described signal evaluation equipment comprises:
Transmit-Receive Unit be used for to receive signal or the value relevant with the error rate after the demodulation of described digital video receiving terminal input; Also be used for the assessment result that analytic unit is determined is exported to described control appliance;
Analytic unit is used for according to the signal after the demodulation number of erroneous packets being added up, and determines the actual error rate according to the number of erroneous packets, relatively determines assessment result by the actual error rate and the standard error code check that sets in advance again; Perhaps directly obtain the value relevant with the error rate from described digital video receiving terminal, to determine the actual error rate, again by relatively more definite assessment result of the actual error rate and the standard error code check that sets in advance.
4. system according to claim 1 is characterized in that, described control appliance is PC or programmable intelligent machine.
5. system according to claim 1 is characterized in that, described control appliance be connected signal generating apparatus and connect by serial ports, network interface or general-purpose interface bus GPIB, described control appliance be connected serial ports, network interface connection with the digital video receiving terminal.
6. method of testing that is applied to the described system of claim 1 is characterized in that the method comprises:
A, control appliance setting produce radiofrequency signal for preset parameter and the parameter to be measured of test item with the control signal generation;
B, digital video receiving terminal receive the radiofrequency signal from signal generating apparatus, and with this radiofrequency signal demodulation;
C, the signal evaluation equipment signal after to the demodulation of digital video reception terminal carries out normal or unusual assessment, and assessment result is exported to described control appliance;
D, described control appliance are adjusted parameter to be measured according to this assessment result, and return steps A and carry out, until determine the threshold value of parameter to be measured, and with the test result of this threshold value as parameter to be measured.
7. method according to claim 6 is characterized in that, also further comprise before the step B: control appliance control figure video reception terminal is carried out initialization, makes the digital video receiving terminal be in tested state.
8. according to claim 6 or 7 described methods, it is characterized in that described step C comprises:
Described signal evaluation equipment receives the signal after the demodulation of described digital video receiving terminal input, according to the signal after the demodulation number of erroneous packets is added up, determine the actual error rate according to the number of erroneous packets, again by the actual error rate and the standard error code check that sets in advance relatively determine assessment result, and assessment result is exported to described control appliance.
9. according to claim 6 or 7 described methods, it is characterized in that described step C comprises:
Described signal evaluation equipment obtains the value relevant with the error rate from described digital video receiving terminal, to determine the actual error rate, again by relatively more definite assessment result of the actual error rate and the standard error code check that sets in advance.
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