CN103581663B - The method of testing of circuit board and system - Google Patents
The method of testing of circuit board and system Download PDFInfo
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Abstract
The method of testing of circuit board and a system, described circuit board is suitable for carrying out demodulation process to the TV signal received, to obtain audio output signal and video output signals; Described method of testing comprises: send scheduled television signal to described circuit board, described scheduled television signal is obtained by predetermined image signal and predetermined audio signal madulation; Described predetermined audio signal is utilized to test the audio output signal that described circuit board exports; Described predetermined image signal is utilized to test the video output signals that described circuit board exports.Technical scheme of the present invention achieves the test of automation, improves testing efficiency and test coverage, reduces testing cost.
Description
Technical field
The present invention relates to technical field of measurement and test, particularly relate to a kind of method of testing and system of circuit board.
Background technology
Along with the progress of science and technology, increasing electronic product has possessed the function playing simulated television or Digital Television.Such as: mobile phone, MP4, mobile unit, handheld device, palmtop PC etc.Electronic product passes through its built-in TV chip, as: digital television chip or simulated television chip carry out TV reception.In general, other chips (control chip, processor) of TV chip and electronic product can be integrated on one piece of circuit board, for mobile phone, the digital television chip of mobile phone and its baseband chip are integrated on one piece of circuit board usually, digital television chip realizes the demodulation to TV signal, and transfer to baseband chip to carry out follow-up process the signal after demodulation, and as: by baseband chip, the TV signal after demodulation is decoded etc.
During electronic product batch production, can test the function of electronic product or performance in production scene, to verify whether the electronic product produced reaches prospective quality requirement, also can find that in production process, Problems existing and product are in the defect of function, aspect of performance, as chip whether rosin joint, inefficacy etc. simultaneously.The circuit board being integrated with TV chip is no exception, also needs to test it.
In prior art, usually by the following two kinds mode, the circuit board being integrated with TV chip is tested:
The first: be connected with circuit-under-test plate by RF cable or wireless mode by television signal generator, whether the data read in TV chip (simulated television chip or digital television chip) interior related register by the main control chip of circuit-under-test plate by computer are normal in function aspects such as received television signal intensity, demodulates television signals to detect TV chip.Thus judge that whether the TV functions of circuit-under-test plate is normal.In this way testing circuit board both can the performance of testing circuit board also can the function of testing circuit board, and accurate for the test and comparison of TV chip radio-frequency performance, whole test process can complete under control of the computer automatically.But television signal generator is expensive, cause testing cost too high, and adopt this method of testing cannot Accurate Determining TV chip be connected when transmit image data signal between main control chip whether correct.
The second: adopt manual type to test, particularly, by manual operation as TV signal that button operation etc. allow tested board receiver TV station send, circuit-under-test plate is made to enter " televising " state, whether normal by the TV functions of the mode artificial judgment circuit board of eye-observation image, people's ear listening.Although adopt which to carry out testing the cost eliminating and configure needed for television signal generator, but when adopting manual testing, on the one hand test coverage and testing efficiency is lower, test result is inaccurate, on the other hand along with the increase of circuit board quantity to be tested, tester also needs corresponding increase, also can cause the increase of testing cost to a certain extent.
Therefore, for the circuit board being integrated with TV chip, how can provide that a kind of testing cost is low, testing efficiency and the high method of testing of coverage rate become one of current problem demanding prompt solution.
The correlation technique of other regarding TV chips can also be US2009190656A1 see publication number, and denomination of invention is the U.S. Patent application of TV chip (Television Functionality on a Chip).
Summary of the invention
The problem that the present invention solves is to provide a kind of testing efficiency and test coverage high and the method for testing of the circuit board that testing cost is low and system.
In order to solve the problem, the invention provides a kind of method of testing of circuit board, described circuit board is suitable for carrying out demodulation process to the TV signal received, to obtain audio output signal and video output signals; Described method of testing comprises: send scheduled television signal to described circuit board, described scheduled television signal is obtained by predetermined image signal and predetermined audio signal madulation; Described predetermined audio signal is utilized to test the audio output signal that described circuit board exports; Described predetermined image signal is utilized to test the video output signals that described circuit board exports.
Optionally, describedly utilize described predetermined audio signal to carry out test to the audio output signal that described circuit board exports to comprise: described audio output signal is converted into frequency domain by time domain; Based on described predetermined audio signal frequency acquisition described in the energy of useful signal and the energy of noise signal in audio output signal; Calculate the energy ratio of described useful signal and noise signal, to obtain the signal to noise ratio of described audio output signal; More described signal to noise ratio and the snr threshold preset.
Optionally, describedly utilize described predetermined image signal to carry out test to the video output signals that described circuit board exports to comprise: utilize the pixel-parameters of described predetermined image signal to test described video output signals.
Optionally, describedly utilize the pixel-parameters of described predetermined image signal to carry out test to described video output signals to comprise: based on the pixel-parameters determination error parameter that the pixel-parameters of a two field picture in described video output signals is corresponding with described predetermined image signal; More described error parameter and the error threshold preset.
Optionally, describedly utilize described predetermined image signal to carry out test to the video output signals that described circuit board exports to comprise: utilize the characteristic parameter of described predetermined image signal to test described video output signals.
Optionally, describedly utilize the characteristic parameter of described predetermined image signal to carry out test to described video output signals to comprise: the word and/or the figure that adopt a two field picture in vision signal described in image recognition algorithm identification; The word that match cognization goes out and/or the figure word corresponding with described predetermined image signal and/or figure.
For solving the problem, present invention also offers a kind of test macro of circuit board, described circuit board is suitable for carrying out demodulation process to the TV signal received, to obtain audio output signal and video output signals; Described test macro comprises: transmitting element, and for sending scheduled television signal to described circuit board, described scheduled television signal is obtained by predetermined image signal and predetermined audio signal madulation; Audio-frequency test unit, tests the audio output signal that described circuit board exports for utilizing described predetermined audio signal; Video measurement unit, tests the video output signals that described circuit board exports for utilizing described predetermined image signal.
Compared with prior art, technical scheme of the present invention has the following advantages:
The scheduled television signal that board receiver is obtained by predetermined image signal and predetermined audio signal madulation, and then utilize described predetermined audio signal and known audio signal to test the audio output signal exported after predetermining circuit signal described in circuit board demodulation process, described predetermined video signal and known vision signal is utilized to test the video output signals exported after predetermining circuit signal described in circuit board demodulation process, to realize the test of the audio frequency and video function to circuit board.Due to without the need to producing TV signal by television signal generator, therefore reduce testing cost to a great extent.And due to the function without the need to being carried out decision circuitry plate by artificial mode whether normal, achieve the test of automation, also improve testing efficiency and test coverage simultaneously.
When utilizing predetermined image signal to test the video output signals that circuit board exports, both testing circuit board can be carried out by the parameter error of comparison video image and predetermined image, again can by match video image and predetermined image feature circuit board is tested, improve the flexibility of test.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the method for testing of the circuit board of embodiment of the present invention;
Fig. 2 is the structural representation of the test macro of the circuit board of embodiment of the present invention;
Fig. 3 is the schematic flow sheet of the method for testing of the circuit board of the embodiment of the present invention one;
Fig. 4 is the structural representation of the test macro of the circuit board of the embodiment of the present invention one;
Fig. 5 is the schematic flow sheet of the method for testing of the circuit board of the embodiment of the present invention two;
Fig. 6 is the structural representation of the test macro of the circuit board of the embodiment of the present invention two.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here to implement with multiple, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention.Therefore the present invention is not by the restriction of following public embodiment.
Just as described in the background art, when adopting existing method of testing Test integration to have a circuit board of TV chip, testing cost is high, testing efficiency and test coverage lower.Therefore, inventor considers, television signal generator whether can not be adopted to produce predetermined TV signal to reduce testing cost, and utilize predetermined TV signal to test circuit board under test outgoing television signal, and then while realizing automatic test, improve testing efficiency and test coverage.
Refer to Fig. 1, the schematic flow sheet of the method for testing of the circuit board of embodiment of the present invention, in present embodiment, described circuit board is suitable for carrying out demodulation process to the TV signal received, to obtain audio output signal and video output signals; The method of testing of described circuit board comprises:
Step S11: send scheduled television signal to described circuit board, described scheduled television signal is obtained by predetermined image signal and predetermined audio signal madulation;
Step S12: utilize described predetermined audio signal to test the audio output signal that described circuit board exports;
Step S13: utilize described predetermined image signal to test the video output signals that described circuit board exports.
In present embodiment, described predetermined image signal has known parameter information, such as, in the image pixel value, chromatic value, brightness value etc. of pixel; Described predetermined audio signal has known parameter information, the frequency, energy (intensity) etc. of such as signal.Described predetermined image signal and predetermined audio signal can pass through the electronic equipments such as VCD, DVD, computer and produce.Described predetermined audio signal can be monophonic audio signal, also can be touch-tone signal; Described predetermined image signal can be still image signal, also can be dynamic image signal.Described predetermined image signal and predetermined audio signal through television signal transmission equipment, as after the modulation of: television signal transmission device to obtain scheduled television signal and to be sent to circuit board to be measured.
Corresponding to the method for testing of the circuit board of embodiment of the present invention, embodiment of the present invention also provides a kind of test macro of circuit board, and described circuit board is suitable for carrying out demodulation process to the TV signal received, to obtain audio output signal and video output signals; The structural representation of the test macro of the circuit board of embodiment of the present invention shown in Figure 2, the test macro of described circuit board comprises:
Transmitting element 11, for sending scheduled television signal to described circuit board 10, described scheduled television signal is obtained by predetermined image signal and predetermined audio signal madulation;
Audio-frequency test unit 12, tests the audio output signal that described circuit board 10 exports for utilizing described predetermined audio signal;
Video measurement unit 13, tests the video output signals that described circuit board 10 exports for utilizing described predetermined image signal.
In present embodiment, described circuit board 10 can be arranged in mobile terminal, also can be arranged in MP4, mobile unit, handheld device, palmtop PC etc.Described transmitting element 11 and described circuit board 10 are sent and received television signal by antenna, can be communicated between described circuit board 10 and described audio-frequency test unit 12, video measurement unit 13 by wireless or wired mode.Described transmitting element 11 can comprise: audio-video signal source and TV signal transmitting apparatus, and described audio-video signal source can be DVD, VCD etc., and described TV signal transmitting apparatus can be television signal transmission device.After circuit board 10 receives the scheduled television signal of described transmitting element 11 transmission, the process such as demodulation, decoding is carried out with output audio output signal and video output signals to it.The audio output signal that described audio-frequency test unit 12 pairs of circuit boards 10 export is tested, and the video output signals that video measurement unit 13 pairs of circuit boards 10 export is tested.Described audio-frequency test unit 12, video measurement unit 13 can be in a computer integrated.
In order to technical scheme of the present invention is described better, below by way of specific embodiment, the method for testing of the circuit board of technical solution of the present invention and test macro are described in detail.In following examples, to have the mobile terminal (described circuit board is arranged in mobile terminal) of TV functions, particularly, TV chip is integrated with for described circuit board and main control chip illustrates accordingly.
Embodiment one
Refer to Fig. 3, the schematic flow sheet of the method for testing of the circuit board of the embodiment of the present invention one, wherein, step S121 ~ step S124 the is corresponding step S12 of Fig. 1, for the audio frequency processing capacity of testing circuit board; Step S131a ~ step S132a is the then corresponding step S13 of Fig. 1, for the video processing function of testing circuit board.The test of audio frequency processing capacity and the test of video processing function can be carried out simultaneously.
First, perform step S111, send scheduled television signal to described circuit board, described scheduled television signal is obtained by predetermined image signal and predetermined audio signal madulation; In the present embodiment, audio-video signal source can be passed through, as DVD produces predetermined image signal and predetermined audio signal, and via TV signal transmitting apparatus, as being sent to circuit board under test after the modulation of television signal transmission device.In order to reduce the complexity of test, in the present embodiment, described predetermined audio signal is monophonic audio signal, and described predetermined image signal is still image signal.
Scheduled television signal described in board receiver to be measured, carries out demodulation by integrated TV chip thereon to described scheduled television signal, then carries out follow-up process by main control chip, isolate audio output signal and video output signals.Described main control chip comprises baseband chip.
Perform step S121, the audio output signal that described circuit board exports is converted into frequency domain by time domain.In the present embodiment, if the audio signal that circuit board under test exports is simulated audio signal, then described step S121 also comprises: the simulated audio signal that circuit board under test exports is converted to digital audio and video signals, as: adopt analog to digital converter (ADC, Analog-to-Digital Converter) with by described simulated audio signal digitlization, the audio signal being converted into frequency domain by time domain is then digital audio and video signals.By analog signal figure, realize test automation to make the follow-up Digital Signal Processing mode that can adopt.
Audio output signal is converted into frequency domain by time domain, first can be multiplied by a window function in time domain to described digital audio and video signals, then by fast Fourier transform (FFT, Fast FourierTransformation), digital audio and video signals after windowing is converted into frequency domain, obtain frequency domain information, according to the method for signal transacting, the spectral sidelobes of signal can be reduced as far as possible.
Then perform step S122, based on described predetermined audio signal frequency acquisition described in the energy of useful signal and the energy of noise signal in audio output signal.Frequency due to predetermined audio signal is known, therefore in the spectrogram of digital audio and video signals, the energy getting the signal within the scope of the frequency main lobe of described predetermined audio signal is the energy of useful signal, and the energy getting the signal outside the frequency range of described predetermined audio signal is the energy of noise signal.
Then perform step S123, calculate the energy ratio of described useful signal and noise signal, to obtain the signal to noise ratio of described audio output signal.By the energy of the energy of useful signal divided by noise signal, obtain signal to noise ratio.
Then step S124 is performed, more described signal to noise ratio and the snr threshold preset.In general, if the normally functioning words of circuit board to be measured, the signal to noise ratio of the audio output signal of circuit board should be higher, such as, be greater than default snr threshold.In actual applications, the snr threshold preset can set based on the actual application requirements, and higher to the requirement of audio quality, snr threshold can set larger, by comparing the signal to noise ratio and snr threshold that calculate, to detect the audio frequency processing capacity of circuit board under test.In the present embodiment, described snr threshold is 10dB, when the signal to noise ratio of the audio output signal that circuit board under test exports is more than or equal to 10dB, then can think that the audio frequency processing capacity of circuit board under test is normal.
Perform step S131a: based on the pixel-parameters determination error parameter that the pixel-parameters of a two field picture in the video output signals that described circuit board exports is corresponding with described predetermined image signal; Then step S132a: more described error parameter and the error threshold preset, to detect the video processing function of circuit board under test.Wherein, a two field picture in video output signals can be any two field picture in video output signals, from video flowing (video output signals), a frame video image is captured by computer, by the pixel-parameters comparison of the pixel-parameters of this two field picture with corresponding predetermined image, error parameter can be obtained.
Described pixel-parameters comprises: at least one in the integrated value of the pixel value of pixel, the integrated value of pixel column and pixel column, accordingly, described error parameter comprises: at least one in pixel value maximum absolute error, pixel value mean square error, row integrated value maximum absolute error, row integrated value mean square error, row integrated value maximum absolute error and row integrated value mean square error; Accordingly, described error threshold comprises: at least one in pixel value maximum absolute error threshold value, pixel value mean square error threshold value, row integrated value maximum absolute error threshold value, row integrated value mean square error threshold value, row integrated value maximum absolute error threshold value and row integrated value mean square error threshold value.
Wherein, described pixel value maximum absolute error is the maximum of the pixel value absolute error of corresponding pixel points in the pixel value of the pixel of a two field picture in described vision signal and described predetermined image signal.
Described pixel value mean square error is the mean value of the difference square of the pixel value of corresponding pixel points in the pixel value of the pixel of a two field picture in described vision signal and described predetermined image signal.
The integrated value of described pixel column is the integrated value of the pixel value of the one-row pixels point of a two field picture in described vision signal.
Described row integrated value maximum absolute error is the maximum of the integrated value absolute error of respective rows of pixels in the integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal.
Described row integrated value mean square error is the mean value of the difference square of the integrated value of respective rows of pixels in the row integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal.
The integrated value of described pixel column is the integrated value of the pixel value of a row pixel of a two field picture in described vision signal.
Described row integrated value maximum absolute error is the maximum of the integrated value absolute error that the respective pixel in the integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal arranges.
Described row integrated value mean square error is the mean value of the difference square of the integrated value that the respective pixel in the row integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal arranges.
Particularly, if described pixel-parameters comprises the pixel value of pixel, then error parameter comprises at least one in pixel value maximum absolute error and pixel value mean square error.For example, in video output signals, the pixel value of each pixel of a two field picture is respectively: p
1, p
2, p
3..., p
n, the pixel value of pixel corresponding in predetermined image is respectively: p
10, p
20, p
30..., p
n0, n is the sum of pixel in a two field picture, then when the absolute error of all pixels: | p
1– p
10|, | p
2– p
20|, | p
3– p
30| ..., | p
n– p
n0| in maximum when being less than pixel value maximum absolute error threshold value T1; Or, when pixel value mean square error: [(p
1– p
10)
2+ (p
2– p
20)
2+ (p
3– p
30)
2+ ... + (p
n– p
n0)
2when]/n is less than pixel value mean square error threshold value T2, can determine that the video processing function of circuit board under test is normal.Or, also can be less than pixel value maximum absolute error threshold value T1 and pixel value mean square error is less than pixel value mean square error threshold value T2 when pixel value maximum absolute error, then determine that the video processing function of circuit board under test is normal.Wherein, described pixel value maximum absolute error threshold value, pixel value mean square error threshold value are determined by practical application and the demand of detection, and such as, the span of T1 can be the span of 5 ~ 30, T2 can be 10 ~ 100.
If described pixel-parameters comprises the integrated value of pixel column, then error parameter comprises at least one in row integrated value maximum absolute error and row integrated value mean square error.For example, in video output signals, the integrated value of each row pixel of a two field picture is respectively: I
1, I
2, I
3..., I
j, in predetermined image, the integrated value of respective rows of pixels is respectively: I
10, I
20, I
30..., I
j0, j is the line number of a two field picture, then when the absolute error of all pixel columns: | I
1– I
10|, | I
2– I
20|, | I
3– I
30| ..., | I
j– I
j0| in maximum when being less than row integrated value maximum absolute error threshold value T3; Or, when row integrated value mean square error: [(I
1– I
10)
2+ (I
2– I
20)
2+ (I
3– I
30)
2+ ... + (I
j– I
j0)
2when]/j is less than row integrated value mean square error threshold value T4, can determine that the video processing function of circuit board under test is normal.Or, also can be less than row integrated value maximum absolute error threshold value T3 and row integrated value mean square error is less than row integrated value mean square error threshold value T4 when row integrated value maximum absolute error, then determine that the video processing function of circuit board under test is normal.Wherein, described row integrated value worst error threshold value, row integrated value mean square error threshold value are determined by practical application and the demand of detection, and such as, the span of T3 can be 5*M ~ 30*M, the span of T4 can be 10*M ~ 100*M, and wherein M is total number of one-row pixels.
If described pixel-parameters comprises the integrated value of pixel column, then error parameter comprises at least one in row integrated value maximum absolute error and row integrated value mean square error.For example, in video output signals, the integrated value of each row pixel of a two field picture is respectively: K
1, K
2, K
3..., K
m, in predetermined image, the integrated value of respective pixel row is respectively: K
10, K
20, K
30..., K
m0, m is the columns of a two field picture, then when the absolute error of all pixel columns: | K
1– K
10|, | K
2– K
20|, | K
3– K
30| ..., | K
m– K
m0| in maximum when being less than row integrated value maximum absolute error threshold value T5; Or, when row integrated value mean square error: [(K
1– I
10)
2+ (K
2– K
20)
2+ (K
3– K
30)
2+ ... + (K
m– K
m0)
2when]/m is less than row integrated value mean square error threshold value T6, can determine that the video processing function of circuit board under test is normal.Or, also can be less than row integrated value maximum absolute error threshold value T5 and row integrated value mean square error is less than row integrated value mean square error threshold value T6 when row integrated value maximum absolute error, then determine that the video processing function of circuit board under test is normal.Wherein, described row integrated value maximum absolute error threshold value, row integrated value mean square error threshold value are determined by practical application and the demand of detection, and such as, the span of T5 can be 5*J ~ 30*J, the span of T6 can be 10*J ~ 100*J, and wherein J is total number of a row pixel.
The audio output signal of circuit board under test output is tested by step S121 ~ S124, step S131a ~ S132a tests the video output signals that circuit board under test exports, the TV chip on circuit board under test can be tested, whether main control chip lost efficacy, whether the welding of TV chip, main control chip exists rosin joint, whether the connection between TV chip and main control chip has problems, and also namely achieves the test to the circuit board being integrated with TV chip.
Corresponding to the method for testing of above-mentioned circuit board, the structure of the test macro of the circuit board of the present embodiment as shown in Figure 4, comprising: transmitting element 11, audio-frequency test unit 12, video measurement unit 13.Described transmitting element 11, audio-frequency test unit 12, video measurement unit 13 are all connected with circuit board 10.
Wherein, described transmitting element 11 comprises:
Audio-video signal source 110, for generation of predetermined image signal and predetermined audio signal;
TV signal transmitting apparatus 111, is connected with described audio-video signal source 110, for modulating to obtain scheduled television signal to described predetermined image signal and predetermined audio signal and being sent to described circuit board 10.
In the present embodiment, described audio-video signal source 110 can be DVD, VCD etc., and described TV signal transmitting apparatus 111 can be television signal transmission device.
Described audio-frequency test unit 12 comprises:
Converting unit 121, for being converted into frequency domain by described audio output signal by time domain;
Acquiring unit 122, is connected with described converting unit 121, for the energy of useful signal and the energy of noise signal in audio output signal described in the frequency acquisition based on described predetermined audio signal;
Computing unit 123, for calculating the described useful signal and the energy ratio of noise signal that described acquiring unit 122 obtains, to obtain the signal to noise ratio of described audio output signal;
First comparing unit 124, calculates described signal to noise ratio and the snr threshold preset for more described computing unit 123.
In the present embodiment, if the audio signal that described circuit board exports is simulated audio signal, described audio-frequency test unit 12 also comprises: AD conversion unit (not shown), for simulated audio signal described in digitlization to obtain digital audio and video signals; Described converting unit is used for described digital audio and video signals to be converted into frequency domain by time domain.Described converting unit adopts FFT that described digital audio and video signals is converted into frequency domain.
In the present embodiment, described video measurement unit 13 utilizes the pixel-parameters of described predetermined image signal to test the video output signals that described circuit board exports.Particularly, described video measurement unit 13 comprises:
Error determining unit 131a, for the pixel-parameters determination error parameter that the pixel-parameters based on a two field picture in described video output signals is corresponding with described predetermined image signal;
Second comparing unit 132a, for more described error parameter and the error threshold preset.
Optionally, described pixel-parameters comprises: the pixel value of pixel; Described error parameter comprises: pixel value maximum absolute error; Described error threshold comprises: pixel value maximum absolute error threshold value; Described pixel value maximum absolute error is the maximum of the pixel value absolute error of corresponding pixel points in the pixel value of the pixel of a two field picture in described vision signal and described predetermined image signal.
Optionally, described pixel-parameters comprises: the pixel value of pixel; Described error parameter comprises: pixel value mean square error; Described error threshold comprises: pixel value mean square error threshold value; Described pixel value is all just the mean value of the difference square of the pixel value of the corresponding pixel points in the pixel value of the pixel of a two field picture in vision signal described in error and described predetermined image signal.
Optionally, described pixel-parameters comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value maximum absolute error; Described error threshold comprises: row integrated value maximum absolute error threshold value; The integrated value of described pixel column is the integrated value of the pixel value of the one-row pixels point of a two field picture in described vision signal; Described row integrated value maximum absolute error is the maximum of the integrated value absolute error of respective rows of pixels in the integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal.
Optionally, described pixel-parameters comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value mean square error; Described error threshold comprises: row integrated value mean square error threshold value; The integrated value of described pixel column is the integrated value of the pixel value of the one-row pixels point of a two field picture in described vision signal; Described row integrated value mean square error is the mean value of the difference square of the integrated value of respective rows of pixels in the integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal.
Optionally, described pixel-parameters comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value maximum absolute error; Described error threshold comprises: row integrated value maximum absolute error threshold value; The integrated value of described pixel column is the integrated value of the pixel value of a row pixel of a two field picture in described vision signal; Described row integrated value maximum absolute error is the maximum of the integrated value absolute error that the respective pixel in the integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal arranges.
Optionally, described pixel-parameters comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value mean square error; Described error threshold comprises: row integrated value mean square error threshold value; The integrated value of described pixel column is the integrated value of the pixel value of a row pixel of a two field picture in described vision signal; Described row integrated value mean square error is the mean value of the difference square of the integrated value that the respective pixel in the integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal arranges.
Below in conjunction with Fig. 4, the course of work of the test macro of the circuit board of the present embodiment is simply illustrated.In the present embodiment, the audio-video signal source 110 of transmitting element 11, produce predetermined image signal and predetermined audio signal, the scheduled television signal obtained after described predetermined image signal and predetermined audio signal madulation is sent to circuit board 10 to be measured by TV signal transmitting apparatus 111.After circuit board 10 to be measured receives scheduled television signal, carry out processing to obtain audio output signal and video output signals accordingly to it.Audio-frequency test unit 12 is based on the signal to noise ratio of the frequency acquisition audio output signal of predetermined audio signal, judge whether described signal to noise ratio is greater than default snr threshold, if described signal to noise ratio is greater than snr threshold, then the Audio Signal Processing test of circuit board to be measured is passed through.Video measurement unit 13 captures a frame video image in the video output signals of circuit board output, based on the pixel-parameters determination error parameter of the pixel-parameters of this video image with the corresponding of predetermined image, judge whether described error parameter is less than default error threshold, if described error parameter is less than error threshold, then the video frequency signal processing test of circuit board to be measured is passed through.
Embodiment two
In the present embodiment, identical with embodiment one to the test of the audio output signal that circuit board exports, then different from embodiment one to the test of the video output signals that circuit board exports.Described predetermined image signal is utilized to test to comprise to the video output signals that described circuit board exports and utilize the characteristic parameter of described predetermined image signal to test the video output signals that described circuit board exports in the present embodiment.In addition, it should be noted that, in other embodiments, also can in conjunction with the embodiments one and embodiment two, utilize the pixel-parameters of predetermined image signal and characteristic parameter to test video output signals, with the video processing function of testing circuit board.
The schematic flow sheet of the method for testing of the circuit board of the embodiment of the present invention two shown in Figure 5, the method for testing of described circuit board comprises:
Step S111: send scheduled television signal to described circuit board, described scheduled television signal is obtained by predetermined image signal and predetermined audio signal madulation;
Step S121: the audio output signal that described circuit board exports is converted into frequency domain by time domain;
Step S122: based on described predetermined audio signal frequency acquisition described in the energy of useful signal and the energy of noise signal in audio output signal;
Step S123: the energy ratio calculating described useful signal and noise signal, to obtain the signal to noise ratio of described audio output signal;
Step S124: more described signal to noise ratio and the snr threshold preset;
Step S131b: the word and/or the figure that adopt a two field picture in video output signals described in image recognition algorithm identification;
Step S132b: the word that match cognization goes out and/or the figure word corresponding with described predetermined image signal and/or figure.
In the present embodiment, step S121 ~ step S124 is corresponding step S12 shown in Fig. 1, step S131b ~ step S132b is then corresponding step S13 shown in Fig. 1.Below step S131b ~ step S132b is described in detail.
Perform step S131b, adopt word and/or the figure of a two field picture in video output signals described in image recognition algorithm identification.For the word in a two field picture, before word is identified, first need to extract character area, be exactly carry out text detection and Text segmentation particularly, the existing detection algorithm based on edge can be adopted in the present embodiment, based on the detection algorithm of texture, detection algorithm etc. based on region detects word, adopt existing threshold method, the method of Corpus--based Method model, Unsupervised clustering method etc. is split the word detected, then optical character identification (OCR is adopted, Optical Character Recognition) technology identifies the word in the character area extracted.
For the figure in a two field picture, then can adopt existing stencil matching algorithm, Bayesian Classification Arithmetic, based on the test pattern algorithm etc. of Hough transform, the figure in image be identified.
When reality is implemented, the word in a two field picture can be identified, or identify the figure in a two field picture, or not only identify word in a two field picture but also identified the figure of a two field picture.
Perform step S132b, the word that match cognization goes out and/or the figure word corresponding with in described predetermined image signal and/or figure, namely, whether the word that judgement identifies and/or the figure word corresponding with predetermined image and/or figure mate.Particularly, prior art can be adopted, the such as mode such as Gray-scale Matching, characteristic matching is mated the word identified in step S131b, word that figure is corresponding with described predetermined image signal, figure, to determine whether word, the figure of the word of the two field picture in the vision signal that identifies, figure and corresponding two field picture in predetermined image signal conform to.If conform to (coupling), then the video processing function of circuit board under test is normal.
Accordingly, the structure of the test macro of the circuit board of the present embodiment as shown in Figure 6, comprising: transmitting element 11, audio-frequency test unit 12, video measurement unit 13 '.Described transmitting element 11, audio-frequency test unit 12, video measurement unit 13 ' are all connected with circuit board 10.
Wherein, similar in described transmitting element 11, audio-frequency test unit 12 and embodiment one, specifically can see in embodiment one to its description, repeat no more herein.
In the present embodiment, described video measurement unit 13 ' utilizes the characteristic parameter of described predetermined image signal to test the video output signals that described circuit board exports.Described video measurement unit 13 ' comprising: recognition unit 131b, for adopting word and/or the figure of a two field picture in video output signals described in image recognition algorithm identification; Matching unit 132b, the word gone out for match cognization and/or the figure word corresponding with described predetermined image signal and/or figure.
Below in conjunction with Fig. 6, the course of work of the test macro of the circuit board of the present embodiment is simply illustrated.In the present embodiment, the audio-video signal source 110 of transmitting element 11, produce predetermined image signal and predetermined audio signal, the scheduled television signal obtained after described predetermined image signal and predetermined audio signal madulation is sent to circuit board 10 to be measured by TV signal transmitting apparatus 111.After circuit board 10 to be measured receives scheduled television signal, carry out processing to obtain audio output signal and video output signals accordingly to it.Audio-frequency test unit 12 is based on the signal to noise ratio of the frequency acquisition audio output signal of predetermined audio signal, judge whether described signal to noise ratio is greater than default snr threshold, if described signal to noise ratio is greater than snr threshold, then the audio frequency process test of circuit board to be measured is passed through.Video measurement unit 13 ' captures a frame video image in the video output signals of circuit board output, word in this video image is mated with the specific character in predetermined image, figure in this video image is mated with the special pattern in predetermined image, namely judge in video image, whether to include the specific character in predetermined image or figure, the Video processing test of circuit board if so, then to be measured is passed through.
To sum up, the method of testing of the circuit board that embodiment of the present invention provides and test macro achieve the automatic test to circuit board, improve testing efficiency and test coverage that circuit board is tested and flexibility is high, reduce testing cost, also reduce the difficulty of the test macro of realizing circuit plate simultaneously.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection range of technical solution of the present invention.
Claims (26)
1. the method for testing of a circuit board, it is characterized in that, described circuit board comprises TV chip, and described TV chip can realize the demodulation to TV signal, described circuit board is suitable for carrying out demodulation process to the TV signal received, to obtain audio output signal and video output signals; Described method of testing can be tested the function of circuit board or performance, the described function to circuit board or performance are carried out test and are comprised: detect TV chip whether normal in received television signal intensity, demodulation telecommunication signal function aspects, described method of testing comprises:
Send scheduled television signal, described scheduled television signal is obtained by predetermined image signal and predetermined audio signal madulation, and described predetermined image signal is still image signal, and described predetermined audio signal is monophonic audio signal;
Described scheduled television signal is by board receiver, and described circuit board carries out demodulation process to the TV signal received;
After described circuit board carries out demodulation process to the TV signal received, output audio output signal and video output signals;
Described predetermined audio signal is utilized to test the audio output signal that described circuit board exports;
Described predetermined image signal is utilized to test the video output signals that described circuit board exports.
2. the method for testing of circuit board as claimed in claim 1, is characterized in that, describedly utilizes described predetermined audio signal to carry out test to the audio output signal that described circuit board exports to comprise:
Described audio output signal is converted into frequency domain by time domain;
Based on described predetermined audio signal frequency acquisition described in the energy of useful signal and the energy of noise signal in audio output signal;
Calculate the energy ratio of described useful signal and noise signal, to obtain the signal to noise ratio of described audio output signal;
More described signal to noise ratio and the snr threshold preset.
3. the method for testing of circuit board as claimed in claim 2, it is characterized in that, the audio output signal that described circuit board exports is simulated audio signal, describedly utilizes described predetermined audio signal to test the audio output signal that described circuit board exports also to comprise: simulated audio signal described in digitlization before described audio output signal is converted into frequency domain by time domain.
4. the method for testing of circuit board as claimed in claim 1, it is characterized in that, describedly utilize described predetermined image signal to carry out test to the video output signals that described circuit board exports to comprise: utilize the pixel-parameters of described predetermined image signal to test described video output signals.
5. the method for testing of circuit board as claimed in claim 4, is characterized in that, describedly utilizes the pixel-parameters of described predetermined image signal to carry out test to described video output signals to comprise:
Based on the pixel-parameters determination error parameter that the pixel-parameters of a two field picture in described video output signals is corresponding with described predetermined image signal;
More described error parameter and the error threshold preset.
6. the method for testing of circuit board as claimed in claim 5, it is characterized in that, described pixel-parameters comprises: the pixel value of pixel; Described error parameter comprises: pixel value maximum absolute error; Described error threshold comprises: pixel value maximum absolute error threshold value;
Described pixel value maximum absolute error is the maximum of the pixel value absolute error of corresponding pixel points in the pixel value of the pixel of a two field picture in described vision signal and described predetermined image signal.
7. the method for testing of circuit board as claimed in claim 5, it is characterized in that, described pixel-parameters comprises: the pixel value of pixel; Described error parameter comprises: pixel value mean square error; Described error threshold comprises: pixel value mean square error threshold value;
Described pixel value mean square error is the mean value of the difference square of the pixel value of corresponding pixel points in the pixel value of the pixel of a two field picture in described vision signal and described predetermined image signal.
8. the method for testing of circuit board as claimed in claim 5, it is characterized in that, described pixel-parameters comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value maximum absolute error; Described error threshold comprises: row integrated value maximum absolute error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of the one-row pixels point of a two field picture in described vision signal;
Described row integrated value maximum absolute error is the maximum of the integrated value absolute error of respective rows of pixels in the integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal.
9. the method for testing of circuit board as claimed in claim 5, it is characterized in that, described pixel-parameters comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value mean square error; Described error threshold comprises: row integrated value mean square error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of the one-row pixels point of a two field picture in described vision signal;
Described row integrated value mean square error is the mean value of the difference square of the integrated value of respective rows of pixels in the integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal.
10. the method for testing of circuit board as claimed in claim 5, it is characterized in that, described pixel-parameters comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value maximum absolute error; Described error threshold comprises: row integrated value maximum absolute error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of a row pixel of a two field picture in described vision signal;
Described row integrated value maximum absolute error is the maximum of the integrated value absolute error that the respective pixel in the integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal arranges.
The method of testing of 11. circuit boards as claimed in claim 5, it is characterized in that, described pixel-parameters comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value mean square error; Described error threshold comprises: row integrated value mean square error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of a row pixel of a two field picture in described vision signal;
Described row integrated value mean square error is the mean value of the difference square of the integrated value that the respective pixel in the integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal arranges.
The method of testing of 12. circuit boards as claimed in claim 1, it is characterized in that, describedly utilize described predetermined image signal to carry out test to the video output signals that described circuit board exports to comprise: utilize the characteristic parameter of described predetermined image signal to test described video output signals.
The method of testing of 13. circuit boards as claimed in claim 12, is characterized in that, describedly utilizes the characteristic parameter of described predetermined image signal to carry out test to described video output signals to comprise:
Adopt word and/or the figure of a two field picture in video output signals described in image recognition algorithm identification;
The word that match cognization goes out and/or the figure word corresponding with described predetermined image signal and/or figure.
The test macro of 14. 1 kinds of circuit boards, it is characterized in that, described circuit board comprises TV chip, and described TV chip can realize the demodulation to TV signal, described circuit board is suitable for carrying out demodulation process to the TV signal received, to obtain audio output signal and video output signals; Described test macro can be tested the function of circuit board or performance, the described function to circuit board or performance are carried out test and are comprised: detect TV chip whether normal in received television signal intensity, demodulation telecommunication signal function aspects, described test macro comprises:
Transmitting element, for sending scheduled television signal, described scheduled television signal is obtained by predetermined image signal and predetermined audio signal madulation;
Described scheduled television signal is by board receiver, and described circuit board carries out demodulation process to the TV signal received;
After described circuit board carries out demodulation process to the TV signal received, output audio output signal and video output signals;
Audio-frequency test unit, tests the audio output signal that described circuit board exports for utilizing described predetermined audio signal;
Video measurement unit, tests the video output signals that described circuit board exports for utilizing described predetermined image signal.
The test macro of 15. circuit boards as claimed in claim 14, it is characterized in that, described audio-frequency test unit comprises:
Converting unit, for being converted into frequency domain by described audio output signal by time domain;
Acquiring unit, for the energy of useful signal and the energy of noise signal in audio output signal described in the frequency acquisition based on described predetermined audio signal;
Computing unit, for calculating the energy ratio of described useful signal and noise signal, to obtain the signal to noise ratio of described audio output signal;
First comparing unit, for more described signal to noise ratio and the snr threshold preset.
The test macro of 16. circuit boards as claimed in claim 15, is characterized in that, the audio output signal that described circuit board exports is simulated audio signal, and described audio-frequency test unit also comprises:
AD conversion unit, for simulated audio signal described in digitlization to obtain digital audio and video signals;
Described converting unit, for being converted into frequency domain by described digital audio and video signals by time domain.
The test macro of 17. circuit boards as claimed in claim 14, is characterized in that, described video measurement unit utilizes the pixel-parameters of described predetermined image signal to test described video output signals.
The test macro of 18. circuit boards as claimed in claim 17, it is characterized in that, described video measurement unit comprises:
Error determining unit, for the pixel-parameters determination error parameter that the pixel-parameters based on a two field picture in described video output signals is corresponding with described predetermined image signal;
Second comparing unit, for more described error parameter and the error threshold preset.
The test macro of 19. circuit boards as claimed in claim 18, it is characterized in that, described pixel-parameters comprises: the pixel value of pixel; Described error parameter comprises: pixel value maximum absolute error; Described error threshold comprises: pixel value maximum absolute error threshold value;
Described pixel value maximum absolute error is the maximum of the pixel value absolute error of corresponding pixel points in the pixel value of the pixel of a two field picture in described vision signal and described predetermined image signal.
The test macro of 20. circuit boards as claimed in claim 18, it is characterized in that, described pixel-parameters comprises: the pixel value of pixel; Described error parameter comprises: pixel value mean square error; Described error threshold comprises: pixel value mean square error threshold value;
Described pixel value mean square error is the mean value of the difference square of the pixel value of corresponding pixel points in the pixel value of the pixel of a two field picture in described vision signal and described predetermined image signal.
The test macro of 21. circuit boards as claimed in claim 18, it is characterized in that, described pixel-parameters comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value maximum absolute error; Described error threshold comprises: row integrated value maximum absolute error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of the one-row pixels point of a two field picture in described vision signal;
Described row integrated value maximum absolute error is the maximum of the integrated value absolute error of respective rows of pixels in the integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal.
The test macro of 22. circuit boards as claimed in claim 18, it is characterized in that, described pixel-parameters comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value mean square error; Described error threshold comprises: row integrated value mean square error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of the one-row pixels point of a two field picture in described vision signal;
Described row integrated value mean square error is the mean value of the difference square of the integrated value of respective rows of pixels in the integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal.
The test macro of 23. circuit boards as claimed in claim 18, it is characterized in that, described pixel-parameters comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value maximum absolute error; Described error threshold comprises: row integrated value maximum absolute error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of a row pixel of a two field picture in described vision signal;
Described row integrated value maximum absolute error is the maximum of the integrated value absolute error that the respective pixel in the integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal arranges.
The test macro of 24. circuit boards as claimed in claim 18, it is characterized in that, described pixel-parameters comprises: the integrated value of pixel column; Described error parameter comprises: row integrated value mean square error; Described error threshold comprises: row integrated value mean square error threshold value;
The integrated value of described pixel column is the integrated value of the pixel value of a row pixel of a two field picture in described vision signal;
Described row integrated value mean square error is the mean value of the difference square of the integrated value that the respective pixel in the integrated value of the pixel column of a two field picture in described vision signal and described predetermined image signal arranges.
The test macro of 25. circuit boards as claimed in claim 14, is characterized in that, described video measurement unit utilizes the characteristic parameter of described predetermined image signal to test described video output signals.
The test macro of 26. circuit boards as claimed in claim 25, it is characterized in that, described video measurement unit comprises:
Recognition unit, for adopting word and/or the figure of a two field picture in video output signals described in image recognition algorithm identification;
Matching unit, the word gone out for match cognization and/or the figure word corresponding with described predetermined image signal and/or figure.
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| CN105704485B (en) * | 2016-02-02 | 2018-05-25 | 广州视源电子科技股份有限公司 | The performance parameter detection method and system of display device |
| CN107483923A (en) * | 2017-08-08 | 2017-12-15 | 广东长虹电子有限公司 | A kind of television system tested automatically |
| CN107526029A (en) * | 2017-08-21 | 2017-12-29 | 集美大学 | The detecting system and detection method of a kind of circuit board |
| CN109166115A (en) * | 2018-08-31 | 2019-01-08 | 天合光能股份有限公司 | A kind of calculation method of the copper foil coverage rate of PCB |
| CN112333440B (en) * | 2020-10-28 | 2022-09-09 | 深圳市金锐显数码科技有限公司 | TV board card detection method and device, terminal equipment and storage medium |
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